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| 1 | A PROBABLE EARTHQUAKE-TSUNAMI SEQUENCE IN PRECAMBRIAN CARBONATE STRATA OF MING TOMBS DISTRICT, BEIJING显示文摘Many abnormal sedimentary structures in the Precambrian carbonate strata of the Ming Tombs District,Beijing, are recognized by the author as a probable earth- quake-tsunami sequence. These structures include a series of soft sedimentary de- formation and elasticoplastic folding and are implicated not only in geological cat- astrophic events but also more or less in the prediction of recent earthquakes. | 宋天锐 | 1988 | Chinese Science Bulletin1988，33，13： | 15 |
| 2 | Dynamic compression characteristics of layered rock mass of significant strength changes in adjacent layers显示文摘Layered rock mass of significant strength changes for adjacent layers is frequently observed in underground excavation,and dynamic loading is a prevalent scenario generated during excavation.In order to improve the driving efficiency and reduce engineering accidents,dynamic compression characteristics of this kind of rock mass should be understood.The dynamic properties of a layered composite rock mass are investigated through a series of rock tests and numerical simulations.The rock mass is artificially made of various proportions of sand,cement and water to control the distinct strength variations at various composite layers separated by parallel bedding planes.All rock specimens are prefabricated in a specially designed mould and then cut into 50 mm in diameter and 50 mm in height for split Hopkinson pressure bar(SHPB)dynamic compression testing.The test results reveal that increasing strain rate causes the increases of peak strength,σ_p,and the corresponding failure strain,ε_p,while the dynamic elastic modulus,E_d,remains almost unchanged.Interestingly,under the same strain rates,Ed of the composite rock specimen is found to decline first and then increase as the dip angle of bedding plane increases.The obtained rock failure patterns due to various dip angles lead to failure modes that could be classified into four categories from our dynamic tests.Also,a series of counterpart numerical simulations has been undertaken,showing that dynamic responses are in good agreement with those obtained from the SHPB tests.The numerical analysis enables us to Iook into the dynamic characteristics of the composite rock mass subjected to a broader range of strain rates and dip angles than these being tested. | Sen Wen Chunshun Zhang Yulin Chang Ping Hu | 2020 | Journal of Rock Mechanics and Geotechnical Engineering2020，12，2： | 13 |
| 3 | Behavior of noncircular tunnels excavated in stratified rock masses-Case of underground coal mines显示文摘The amount of tunnels excavated along stratified/sedimentary rock masses in Quangninh coal mine area,Vietnam, is gradually increasing. Rock mass in Quangninh is characterized by beddings between rock layers. The behavior of stratified rock masses surrounding the tunnels depends on both the intact rock and the beddings between rock layers. The main characteristics of stratified rock masses that need to be considered are their heterogeneity and anisotropy. Depending on the dip angle of rock layers, movements and failure zones developed surrounding the tunnels can be asymmetrical over the vertical axis of tunnel. This asymmetry causes adverse behaviors of the tunnel structures. The objective of this study is to highlight convergences and yielded zones developed in rock masses surrounding noncircular tunnels in Quangninh coal mine area using a finite element method. The presence of bedding joints is explicitly simulated. The numerical results indicated that with the increase in dip angle of bedding joints, the stress asymmetry over the tunnel vertical axis increases. It gradually leads to an asymmetry of the failure zone surrounding the tunnel. An increase of rock mass quality means a decrease of rock mass sensitivity to the discontinuities. In addition,a dip angle of the bedding joints of approximately 45° could be considered as the critical angle at which the rock mass mechanism changes between sliding and bending. | Ngoc Anh Do Daniel Dias Van Diep Dinh Tien Tung Tran Van Canh Dao Viet Doan Dao Phuc Nhan Nguyen | 2019 | Journal of Rock Mechanics and Geotechnical Engineering2019，11，1： | 9 |
| 4 | A numerical simulation study on mechanical behaviour of coal with bedding planes under coupled static and dynamic load显示文摘To investigate the bedding influence on coal mechanical behaviour in underground environments such as coal or rock burst, simulations of dynamic SHPB tests of pre-stressed coal specimens with different bedding angles were carried out using a particle flow code 2-dimensional(PFC2D). Three impact velocities of 4, 8 and 12 m/s were selected to study dynamic behaviours of coal containing bedding planes under different dynamic loads. The simulation results showed that the existence of bedding planes leads to the degradation of the mechanical properties and their weakening effect significantly depends on the angle h between the bedding planes and load direction. With h increaseing from 0° to 90°, the strength first decreased and subsequently increased and specimens became most vulnerable when h was 30° or 45°.Five failure modes were observed in the specimens in the context of macro-cracks. Furthermore, energy characteristics combined with ultimate failure patterns revealed that maximum accumulated energy and failure intensity have a positive relation with the strength of specimen. When bedding planes were parallel or perpendicular to loading direction, specimens absorbed more energy and experienced more violent failure with increased number of cracks. In contrast, bedding planes with h of 30° or 45° reduced the specimens' ability of storing strain energy to the lowest with fewer cracks observed after failure. | Lihai Tan Ting Ren Xiaohan Yang Xueqiu He | 2018 | International Journal of Mining Science and Technology2018，28，5： | 7 |
| 5 | Controlling plant architecture by manipulation of gibberellicacid signalling in petunia显示文摘Since stem elongation is a gibberellic acid(GA)response,GA inhibitors are commonly used to control plant height in the production of potted ornamentals and bedding plants.In this study,we investigated interfering with GA signaling by using molecular techniques as an alternative approach.We isolated three putative GID1 genes(PhGID1A,PhGID1B and PhGID1C)encoding GA receptors from petunia.Virus-induced gene silencing(VIGS)of these genes results in stunted growth,dark-green leaves and late-flowering.We also isolated the gai mutant gene(gai-1)from Arabidopsis.We have generated transgenic petunia plants in which the gai mutant protein is over-expressed under the control of a dexamethasone-inducible promoter.This system permits induction of the dominant Arabidopsis gai mutant gene at a desired stage of plant development in petunia plants by the application of dexamethasone(Dex).The induction of gai in Dex-treated T1 petunia seedlings caused dramatic growth retardation with short internodes. | Yin-Chih Liang Michael S Reid Cai-Zhong Jiang | 2014 | Horticulture Research2014，1，1： | 5 |
| 6 | Directivity effect of unloading bedding coal induced fracture evolution and its application显示文摘In the coal mining process, the gas contained in the coalbed is one source of the most serious accident hazards. Stress releasing from the coal deposit is the main controlling factor that leads to such accidents.Based on the bedding of coal samples, the gas permeability well describes the evolution of fracture, so the paper carries out research on the permeability properties of coal under different unloading directions.The research obtains that when the stress unloading direction is perpendicular to bedding, more penetrating fractures and bedding fractures occur, and the permeability significantly increases. Although the axial stress reduced, the confining pressure makes the permeability of the bedding plane fracture exist under constant. The permeability obtained when the unloading direction was perpendicular to the bedding is 52 times larger than that when it is parallel to the bedding. The results show that the efficiency of gas drainage is impacted by the relative direction of gas drainage drilling in relation to the bedding orientations. The maximum amount of gas extraction when drilling is perpendicular to the bedding is 1.3 times than that when drilling is oblique to the bedding, and 1.75 times than that when drilling is parallel to the bedding. | Pan Rongkun Fu Dong Yu Minggao Chen Lei | 2017 | International Journal of Mining Science and Technology2017，27，5： | 3 |
| 7 | Serviceability analysis of deep underground openings driven in jointed-rock显示文摘The performance of underground excavations is inevitably influenced by rock mass characteristics, presence of joints and their geometrical properties, depth below surface and state of in-situ stress field. The objective of this paper is to investigate the behaviour of deep underground tunnel opening existed between two bedding planes, Such planes weaken the strength of rock mass and may cause rock slippage/rotation along them. Therefore, the state of stress-displacement, after tunnel opening has been introduced, is examined using two-dimensional elasto-plastic finite-elements code, RS^(2D). The results indicate that, there is significant drop in the normal stress along joints over tunnel opening; slip occurs due to reversal in the direction of shear stress(e.g., inward shear displacement is produced) and there is discontinuity in the strength contours of rock surrounding tunnel after they have been intersected by bedding planes. | Abdellah Wael R. | 2017 | International Journal of Mining Science and Technology2017，27，6： | 2 |
| 8 | Influence of Bedding and Mineral Composition on Mechanical Properties and Its Implication for Hydraulic Fracturing of Shale Oil Reservoirs显示文摘The premise of hydraulic fracturing is to have an accurate and detailed understanding of the rock mechanical properties and fracture propagation law of shale reservoirs. In this paper,a comprehensive evaluation of the mechanical properties of the shale oil reservoir in the south of Songliao Basin is carried out. Based on the experiments and the in-situ stress analysis, the fracture propagation law of three types of shale reservoirs is obtained,and the suggestions for fracturing are put forward. The results have shown that the fracture propagation of pure shale and low mature reservoir is easy to open along the bedding plane under compression loading,which is greatly influenced by the bedding. Sand-bearing shale is slightly better,the fractures of which are not easy to open along the bedding plane. The mechanical experimental results show that all the samples have the characteristics of low compressive strength,low Young’s modulus and strong anisotropy,indicating that the shale oil reservoir is certain plastic,which is related to its high clay mineral content and controlled by the bedding development. Compared with pure shale and low mature shale,the sandbearing shale has less clay content and less developed bedding,which maybe the main reason for its slightly better brittleness. Overall,the expansion of hydraulic fracture is controlled by in-situ stress and bedding. Because of the development of bedding,it is easy to form horizontal fractures. Thus it is not suitable for horizontal well fracturing.Because of the high content of clay minerals,the applicability of conventional slick hydraulic fracturing fluid is poor. It is suggested to use vertical well or directional well to carry out volume fracturing. In this way,the effect of bedding can be effectively used to open and connect the bedding and form a larger fracture network. | WANG Xiaoqiong XU Jianguo ZHAO Chenxu LIU Tongyuan GE Hongkui SHEN Yinghao WU Shan YU Jiayao HUANG Rongyan | 2020 | Earthquake Research in China2020，34，2： | 2 |
| 9 | SHAOXING-JIANGSHAN DEEP-SEATED FAULT ZONE,ZHEJIANG PROVINCE显示文摘The Shaoxing-Jiangshan fault zone crossing over the whole Zhejiang Province and extending through to the Jiangxi Province is a large-scale inland rift zone of South China, in which the Mesozoic-Cenozoic basins may be traced for nearly a thousand kilo- | 水涛 徐步台 梁如华 邱郁双 | 1986 | Chinese Science Bulletin1986，31，18： | 2 |
| 10 | Modeling shale with consideration of bedding planes by cohesive finite element method显示文摘Shale contains distributed directional bedding planes,which make the shale transverse isotropic.To model shale with consideration of the bedding planes,a cohesive finite element method(CFEM)is developed based on the randomized triangular mesh.The interface orientation generated from such mesh tends to be uniformly distributed with the element number increasing.To represent the bedding plane,the interfaces aligned with the bedding plane are assigned the cohesive law that characterizes the bedding plane while the other interfaces are assigned the cohesive law that characterizes the matrix.By this means,the anisotropy characteristics of the stiffness and the strength of shale are well represented.The simulation examples demonstrate that the bedding plane has a significant influence on the fracture trajectory,which is consistent with the observation in the experiment.It is suggested that this modeling method of shale is feasible.It provides an alternative approach to fracture simulation in shale. | Chunfang Li Zhennan Zhang | 2019 | Theoretical & Applied Mechanics Letters2019，9，6： | 2 |
| 11 | URANIUM DISTRIBUTION AND CONCENTRATION IN SOME SEDIMENTARY CARBONATES, SILICALITES AND PELITIC ROCKS显示文摘This paper describes the characteristics of uranium distribution during the sedimentation-diagenesis and epigenesis processes in some sedimentary carbonates, silicalites and pelitic rocks in Sinian-Cambrian Systems in the south of China by using the induced fission track and other methods. Polished thin sections of rocks were put in the vertical channel of reactor for radiation, the integral flux of nutron being 2.03×1016n/cm2. | 张待时 | 1983 | Chinese Science Bulletin1983，28，11： | 2 |
| 12 | High-precision geochronological constraints on the duration of ‘Dinosaur Pompeii’ and the Yixian Formation显示文摘The Early Cretaceous Jehol Biota,renowned for its exceptionally wellpreserved volcanic-influenced ecosystem, was buried in lacustrine and occasionally fluvial sediments. This includes, notably, the Huajiying, Yixian and Jiufotang Formations in northern Hebei and western Liaoning and equivalent ash-interbedding sediments in neighboring areas [1–3](Fig. 1). It harbors many evolutionarily significant taxonomies, e.g. feathered dinosaurs,early birds, mammals and flowering plants, representing one of the most diversified terrestrial biotas of the Mesozoic [1,2,4]. | Yuting Zhong Magdalena H.Huyskens Qing-Zhu Yin Yaqiong Wang Qiang Ma Yi-Gang Xu | 2021 | National Science Review2021，8，6： | 2 |
| 13 | ORIGIN OF LATE HOLOCENE HIGHEST BEACHROCK ALONG CENTRAL COAST IN FUJIAN PROVINCE显示文摘There are residual beachrocks from the top down to the beach (called the high, the middle and the low beachrocks respectively) on Longhashan (35.5m a.s.I.) at Houshijing of the Hushi Peninsula, Putian, Fujian Province. During the past few years the high beach rockbody (Fig. 1) has been determined as aragonite-bearing beachrocks, and its origin, major formation stages, magnitude and rate of the strong elevation and subsidence in the past several thousand years have been studied. | 袁又申 毕福志 | 1985 | Chinese Science Bulletin1985，30，4： | 1 |
| 14 | The Sedimentation and Formation Mechanism of Lacustrine Endogenic Debris Flow显示文摘The debris flow formed by mass transportation of lacustrine deltaic sediments is quite unique comparedwith subaerial one, and is called 'endogenic debris flow' in this paper. The major diagnostic features ofendogenic debris flow sediments are muddy rip-ups, sandy lumps, randomly distributed carbonaceous plantleaves and rhyotaxitic structure. However, such debris flow can not be completely generalized by the conclu-sion that larger granules are supported by cohesive strength of the matrix. The fact that sediments can betransported in plastic state is considered to be related with two different functions of combined clay-water ma-terials: serving as a matrix in texture and as an adhesive between grains. This paper also discusses the originand sediment types of endogenic debris flow as well as the general concepts of matrix and debris flow. From the viewpoint of 'true debris flow', this paper attempts to generalize and illustrate the basic featuresand variation of endogenic debris flow sediments on the basis of the Bingham (Coulomb-viscosity) model. | Wang Deping Institute of Geology, Shengli Petroleum Administration, Dongying, Shandong Liu Linqun | 1992 | Acta Geologica Sinica(English Edition)1992，66，2： | 1 |
| 15 | The Mechanism of Structural Control of Ore Formation and Geochemical Characteristics in the Massive Sulfide Deposits of the Wushan Copper Ore Field,Jiangxi显示文摘The ore-controlling mechanism of the bedding fault system in the massive sulfide deposits of the Wushancopper orefield may be generalized as the control of ore deposition by optimum surface in an ore-formingstructural trap. The mechanism has three major features: (1) timing of mineralization; (2) positioning of hostformation; and (3) dependence of ore-controlling structure on properties of rocks. The 'optimum surface' is adivisional structural plane which marks obvious difference in physical, chemical and mechanical properties andis favorable for mineralization. It is also a unity of structures. lithofacies and orebodies. The structural and geochemical characteristics of the ore deposits indicate the migration trend of the ma-jor characteristic clements in the ore-controlling fault belt: elements with a small radius (Si, Fe, Mg and Al)moved towards and concentrated at the center of the belt while large-radius ones (Ca, K and Na) were remotefrom the center. | Liu Xun Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing Zhang Zhongmin | 1990 | Acta Geologica Sinica(English Edition)1990，64，3： | 1 |
| 16 | QUATERNARY STRATA AND PALAEOCLIMATE IN SHANGHAI REGION显示文摘Situated on the front of the Changjiang (Yangtse) Delta, the whole Shanghai region geologically lies on the edge of the north Jiangsu seg. Since the Quaternary period it has been a sinking region with a deposit of tectorium about 150—400 m in thickness. On the basis of data of the sporo-pollen, microfossils, lithological characters and lithofacie of more than two hundred deep cores and three hundred shallow cores. | 竹淑贞 陈业裕 孙永福 徐耀庭 | 1980 | Chinese Science Bulletin1980，25，4： | 1 |
| 17 | Response analysis of shale bedding structure to ultrasonic characteristics and its application显示文摘Based on the wave theory, different bedding structure models for shales in Lower Silurian Longmaxi Formation of southeastern Chongqing area were established, numerical simulations of responses of different bedding structures of shale to ultrasonic wave were carried out by using the second order in time and fourth order in space grid finite difference method, based on the grey system theory, sensitive factors of acoustic parameters of bedding structure were selected, and the dynamic mechanical parameter model of bedded shale was established, which was verified by the ultrasonic transmission experiment results on core down Well ZY1 and YY1 and the logging data of Well ZY2. The results show that:(1) The correlation coefficient between analog and experimental waveforms is greater than 80%, indicating that the numerical simulation method can effectively simulate ultrasonic transmission experiment.(2) Acoustic velocity is a conventional sensitive factor used to characterize shale bedding structure, whereas the attenuation coefficient is sensitive to the change of bedding thickness, with correlation coefficient of 0.89, therefore, using the normalized results of attenuation coefficient to comprehensively describe the shale bedding can make the results more accurate.(3) The correlation between the dynamic and static parameters calculated by the model is better than that of the traditional model; and the predicted values of rock mechanics obtained by using the model and logging data inversion are in good agreement with the experimental values. The research results lay the foundation for further accurate prediction of rock mechanic parameters using sonic logging data. | XU Fenglin CHEN Qiao ZHU Honglin WANG Dan CHEN Jilong LIU Pu YAO Guanghua ZHANG Kuo HUO Zhenyong | 2019 | Petroleum Exploration and Development2019，46，1： | 1 |
| 18 | FEATURES OF RECENT STORM DEPOSITION IN TAI LAKE显示文摘Ⅰ. MORPHOLOGIC FEATURES AND PHYSICAL SETTING The Tai Lake is one of the five largest freshwater lakes in China, It lies on the broad and level Taihu plain situated between the mouth of the Changjiang and Qiantang rivers and borders on the north of the higher plain, the Xichenyu; on the south, the Hangjiahu marine-lacustrine plain; on the west, the Maoshan mountainland and Taoge | 孙顺才 伍贻范 | 1986 | Chinese Science Bulletin1986，31，23： | 1 |
| 19 | NOCTIDIURNAL GROWTH RHYTHM OF FILAMENTOUS CYANOPHYTES FROM THE GAOYUZHUANG FORMATION (CHANGCHENGIAN SYSTEM)OF NORTH CHINA显示文摘We wish to report the discovery of a probable noetidiurnal growth rhythm of filamentous cyanophytes from black cherts of the e. 1400—1500 m.y. old Gaoyuzhuang Formation (Changchengian System) of Pangjiabu, Xuanhua, Hebei Province, North China. Light microscopic obser- | 张忠英 李正惠 | 1984 | Chinese Science Bulletin1984，29，8： | 1 |
| 20 | THE PALEOSEISMIC ROCK RECORD显示文摘According to historical seismic literature, recorded seismic activities could be traced back to 1831 B. C. in China. Recently, there has been increasing interest in the studies of phenomenal crustal variations taking place on the surface of the earth (such as landslide,landslip, earth vent, river system change, seismic deformation of river facies and lake | 王尔康 欧阳钟辉 刘聪 邱礼仪 黄振作 黄良国 | 1987 | Chinese Science Bulletin1987，32，17： | 0 |
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