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| 1 | The deep-lake deposit in the Upper Triassic Yanchang Formation in Ordos Basin, China and its significance for oil-gas accumulation显示文摘The deep-lake facies of the Yanchang Formation represents a large outflowing lake basin in the Ordos area. Its deposition can be divided into four stages: lake genetic and expanding stage, peak stage, inversion stage and dying stage. All the stages are obviously consistent with the evolution of depositional environment and the paleoclimate in the region. The study indicates that the lake basin has evolution fluctuations from highstand to lowstand for four times in its evolution history, and the deposition center of the lake has not obviously moved, staying along the Huachi-Yijun belt. The deep lake sedimentary system mainly consists of deep water deltas and turbidite fans during the entire evolution course of the lake basin in the Late Triassic. The former mainly developed on the slope of steep shore of the delta in the early period of the deep-water expansion and gradually experienced a big shift from deep-water deltas to shallow-water platform delta. And the latter appeared almost in all the above stages and had two types of turbidite fans, slope-moving turbidite fans and slump turbidite fans. The slope-moving turbidite fans have relatively complete facies belts overlapping one another vertically and consist of the slope channel of inter fans, the turbidite channel, inter turbidite channel and turbidite channel front of middle fans and outer fans (or lakebottom plain). However, the slide-moving turbidity fans are formed in the deep lake with their microfacies difficult to be distinguished, and only the center microfacies and edge microfacies can be determined. The two types of the turbidity fans are similarly distributing in the near-root-slope and far-root-slope regions. The deep-lake deposition governs the distribution of the hydrocarbon and reservoir, while the slope-moving turbidite fans are excellent reservoirs for oil-gas exploration due to their great thickness, widespread distribution and accumulation properties. | CHEN QuanHong LI WenHou GAO YongXiang GUO YanQin FENG JuanPing ZHANG DaoFeng CAO HongXia LIANG JiWei | 2007 | Science China Earth Sciences2007，50，z2： | 12 |
| 2 | Property and Degradation Characteristics of Concrete Prepared with Aggregate Contained Montmorillonite显示文摘To evaluate the property and degradation characteristics of concrete prepared with aggregate contained montmorillonite, concretes were prepared with aggregates contained montmorillonite, and then concrete slump loss, compressive strength, electric flux, the resistance to carbonization, freezing-thawing and sulfate attack were evaluated. The results show that montmorillonite appearance alters concrete slump loss and compressive strength. But montmorillonite increases electric flux and compactness. The carbonization, freezingthawing and sulfate attack results indicate that montmorillonite enhances carbonization depth, increases mass loss after 300 cycle freezing-thawing, as well as mass loss after sulfate attack. Overall, it is adverse to the concrete resistance to the carbonization, freezing-thawing and sulfate attack. | 王艳伟 XU Chao 李好新 | 2019 | Journal of Wuhan University of Technology(Materials Science)2019，34，1： | 1 |
| 3 | STABILITY ANALYSIS OF COFFERDAM SLUMP AND ITS APPLICATION IN THE CLOSURE OPERATION OF THREE GORGES PROJECT显示文摘A theoretical model is built to calculate the slump of dike head during process of cofferdam construction in river closure operation. Considering flow scours, the depth of scouring zone is estimated and its effect on slump scale can be determined. Using the theoretical model to analyze stability of cofferdam of The Three Gorge Project, slump length and volume of dike head in the river closure operation are predicted. When closure gap is 1 10-80m wide, slump occurs heavily and the maximum slump length of dike head reaches 7m. | WANG Guangqian Professor, Dept. of Hydraulic Engineering, Tsinghua University, Beijing 100084,China ZHOU Hougui Senior Engineer, Gezhouba Group Corporation, Yichang Hubei 443002, China LIU Lubo Master Student, Dept. of Hydraulic Engineering, Tsinghu | 1997 | International Journal of Sediment Research1997，12，3： | 1 |
| 4 | Research Progress of Seafloor Pockmarks in Spatio-Temporal Distribution and Classification显示文摘Seafloor pockmarks are important indicators of submarine methane seepages and slope instabilities.In order to promote the understanding of submarine pockmarks and their relationship with sediment instabilities and climate changes,here we summarize the research results of pockmarks in the spatio-temporal distributions and shaping factors.Most of pockmarks occur along active or passive continental margins during the last 25 kyr B.P..Circular and ellipse are the most common forms of pockmarks,whereas pockmarks in a special crescent or elongated shape are indicators of slope instabilities,and ring-shape pockmarks are endemic to the gas hydrate zones.Further researches should be focused on the trigger mechanism of climate changes based on the pockmarks in the high latitudes formed during the deglaciation periods,and the role of gas hydrates in the seafloor evolution should be elucidated.In addition,the feature of pockmarks at their early stage(e.g.,developing gas chimneys and gas driving sedimentary doming)and the relations between pockmarks and mass movements,mud diapirs could be further studied to clarify the influences of rapid methane release from submarine sediments on the atmospheric carbon contents. | XU Cuiling XU Guoqiang XING Junhui SUN Zhilei WU Nengyou | 2020 | Journal of Ocean University of China2020，19，1： | 1 |
| 5 | Evaluation the Effects of Coarse Aggregates Size on Concrete Properties显示文摘Concrete is the most generally used construction material in buildings,pavements,and infrastructures.Concrete is a construction material composed of cement as binder,fine aggregates and coarse aggregates mixed with water which hardens with time.Concrete is a versatile construction material within the housing industry of the planet.The standard of the concrete is tormented by various factors and from those various factors which may have an effect on the concrete quality are,the coarse combination size has its own nice role on the standard of concrete production.A laboratorial experiment was conducted to work out the results coarse aggregates size on recent and hardened concrete properties.For this study totally different crushed volcanic rock aggregates sizes were collected from almost Jimma city for determination of the results of coarse aggregate sizes in concrete production.Three coarse aggregate nominal sizes of 10 mm,14 mm and 20 mm were used for samples production to envision the scale effects on concrete properties.For this study the procedures that was followed,the types and quantity of materials for concrete creating were similar whereas sizes of nominal basaltic coarse aggregate were different.The fresh concrete has a slump value of 67 mm,72 mm and 83 mm for 10mm,14 mm and 20 mm aggregate sizes respectively.A total of thirty six concrete cube samples were ready and tested using compressive strength testing machine at totally different ages of the cube 7 days,14 days,and 28 days,to know their strengths.The compressive strength was 23.524 Mpa,22.643 Mpa and 22.41 MPa for aggregate sizes of 10 mm,14 mm and 20 mm respectively.The laboratory results show that 10mm coarse aggregate size gave the most effective compressive strength and comparatively lowest slump at similar water/cement ratio of 0.6.At 28th day 10mm coarse aggregate size gave 23.524 Mpa compressive strength which is the maximum compressive strength from the remainder coarse aggregates so,the optimum maximum size of coarse aggregate for this study was 10mm. | Mamaru Dessalegn Belay | 2021 | Journal of Construction Research2021，3，2： | 0 |
| 6 | A continuum method for granular collapse with μ(I)-rheology-based dynamic earth pressure coefficient显示文摘In this paper,a continuum model with dynamic earth pressure coefficient is established to describe the granular slump process by introducingμ(I)rheology.This rheology is adopted to quantify the normal stresses in our proposed model rather than shear stresses in classical models.The constitutive laws of different depth-averaged continuum approaches including the hydrodynamic,Savage–Hutter and proposed models are comparatively investigated in terms of the rheological effects on the spread of a granular column.The simulation results indicate that the proposed dynamic model captures some significant features during granular slump on inclined planes with different inclination angles(for example,the runout distance,runout time,and final profile).The proposed model can also reproduce the inner static sided axisymmetric region observed in tests when the granular column's initial aspect ratio(ratio of height to radii)is small. | Jianbo Fei Yuxin Jie Hao Xiong Chengyu Hong | 2021 | Particuology2021，19，5： | 0 |
| 7 | Genetic model for slump coalbed and extrathick coalbed from Fushun Basin, Northeast China显示文摘Coalbed genesis study is the theoretical basis for coal geology and sedimentology. It has been suggested that the most economic coalbeds are formed in situ. However, the author discovered a large number of syndepositional slump coalbeds with main allochthonous components and associated gravity-influenced muddy interlayers for the first time in the extrathick coalbeds from the Fushun Basin, and established a new coal-forming model. | 吴冲龙 | 1995 | Chinese Science Bulletin1995，40，3： | 0 |
| 8 | THE SLUMP RETENTION OF N-2000 HIGH-RANGE WATER-REDUCING AND RETARDING ADMIXTURE显示文摘N-2000 is an admixture for concrete, with a low slump loss, high range water-reducing ratio and long-time retarding. The N-2000 is made up of naphthalene-sulfonic-maldehyde polycondensation (NSMP) and ATMP. Its characteristic results from the synergistic effects of NSMP and ATMP. The results show that when O.7%-1.2% of N-2000 is added to con crete (by mass of cement), the water reducing ratio is up to 20%-30%, and the slump of fresh concrete can be retained for 2 hours without significant loss. N-2000 can not only improve the workability of fresh concrete but also increase the strength of the hardened concrete, especially early strength. It is also proved to have a good compatibility with various cements. | 梁文泉 | 2000 | Journal of Wuhan University of Technology(Materials Science)2000，15，4： | 0 |
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