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| 1 | Nonlinear Seismic Response of Rock Tunnels Crossing Inactive Fault under Obliquely Incident Seismic P Waves显示文摘The failure mechanism of tunnels crossing faults is a critical issue for tunnels located in seismically active regions. This study aims to investigate the nonlinear response of rock tunnels crossing inactive faults under obliquely incident seismic P waves. Based on the equivalent nodal force method together with the viscous-spring boundary, an incident method for the site, which contains fault and is subjected to obliquely incident seismic P waves, is developed first. Then, based on the proposed incident method, the nonlinear response and the failure process of the tunnel crossing inactive fault are numerically studied. The numerical results show that the failure mechanism of the tunnel crossing inactive fault can be attributed to the combined action of the seismic waves and its associated fault slippage. Finally, parameter studies are conducted to investigate the effects of the wave impedance ratio of the fault to the surrounding rock and the incident angle of P waves. By the parameter analysis, it can be concluded that:(1) with decreasing the wave impedance ratio of the fault to the surrounding rock, the seismic response of the tunnel increases significantly;(2) the seismic response of the tunnel increases first and then decreases with the increasing of the incident angle of P waves. This study offers the insight for further research on the seismic stability of tunnels crossing inactive faults. | Hongyun Jiao Xiuli Du Mi Zhao Jingqi Huang Xu Zhao Wenlong Ouyang | 2021 | Journal of Earth Science2021，32，5： | 3 |
| 2 | Fully fluid-solid coupling dynamic model for seismic response of underground structures in saturated soils显示文摘The seismic response characteristics of underground structures in saturated soils are investigated.A fully fluid-solid coupling dynamic model is developed and implemented into ABAQUS with a user-defined element to simulate the dynamic behavior of saturated soils.The accuracy of the model is validated using a classic example in literature.The performance of the model is verified by its application on simulating the seismic response characteristics of a subway station built in saturated soils.The merits of the model are demonstrated by comparing the difference of the seismic response of an underground structure in saturated soils between using the fully coupling model and a single-phase medium model.The study finds that the fully coupling model developed herein can simulate the dynamic response characteristics of the underground structures in saturated soils with high accuracy.The seismic response of the underground structure tends to be underestimated by using the single-phase medium model compared with using the fully coupling model,which provides a weaker confining action to the underground structure. | Li Liang Jiao Hongyun Du Xiuli Shi Peixin | 2020 | Earthquake Engineering and Engineering Vibration2020，19，2： | 2 |
| 3 | Risk factors for progressive ischemic stroke: A retrospective analysis显示文摘BACKGROUND:Progressive ischemic stroke has higher fatality rate and disability rate than common cerebral infarction,thus it is very significant to investigate the early predicting factors related to the occurrence of progressive ischemic stroke,the potential pathological mechanism and the risk factors of early intervention for preventing the occurrence of progressive ischemic stroke and ameliorating its outcome. OBJECTIVE:To analyze the possible related risk factors in patients with progressive ishcemic stroke,so as to provide reference for the prevention and treatment of progressive ishcemic stroke. DESIGN:A retrospective analysis. SETTING:Department of Neurology,General Hospital of Beijing Coal Mining Group. PARTICIPANTS:Totally 280 patients with progressive ischemic stroke were selected from the Department of Neurology,General Hospital of Beijing Coal Mining Group from March 2002 to June 2006,including 192 males and 88 females,with a mean age of(62±7) years old. They were all accorded with the diagnostic standards for cerebral infarction set by the Fourth National Academic Meeting for Cerebrovascular Disease in 1995,and confired by CT or MRI,admitted within 24 hours after attack,and the neurological defect progressed gradually or aggravated in gradients within 72 hours after attack,and the aggravation of neurological defect was defined as the neurological deficit score decreased by more than 2 points. Meanwhile,200 inpatients with non-progressive ischemic stroke(135 males and 65 females) were selected as the control group. METHODS:After admission,a univariate analysis of variance was conducted using the factors of blood pressure,history of diabetes mellitus,fever,leukocytosis,levels of blood lipids,fibrinogen,blood glucose and plasma homocysteine,cerebral arterial stenosis,and CT symptoms of early infarction,and the significant factors were involved in the multivariate non-conditional Logistic regression analysis. MAIN OUTCOME MEASURES:Results of the univariate analysis of variance of the factors related to progressive ischemic stroke;Results of the multivariate regression analysis. RESULTS:All the 480 patients were involved in the analysis of results. ① Results of the univariate analysis variance:There were significantly more patients with fever,leukocytosis,history of diabetes mellitus,cerebral arterial stenosis and CT symptoms of early infarction in the progressive ischemic stroke group than in the control group(P < 0.01);The levels of blood glucose and fibrinogen in the progressive ischemic stroke group were significantly higher than those in the control group,while the level of blood pressure was significantly lower than that in the control group(P < 0.05-0.01). ② Results of the multivariate Logistic regression analysis:The independent predicting factors for progressive ischemic stroke were history of diabetes mellitus,fever,leukocytosis,cerebral arterial stenosis,CT symptoms of early infarction,blood glucose and blood pressure(OR =2.61,2.96,3.79,1.03,3.57,2.68,95% CI 0.92-3.59,P < 0.05-0.01). CONCLUSION:History of diabetes mellitus,fever,leukocytosis,levels of blood pressure,blood glucose,cerebral arterial stenosis and CT symptoms of early infarction are the risk factors for progress ischemic | Ding Qin Junhong Chen Hongyun Jiao Jing Yi Ying Zhang Fengsheng Li | 2007 | Neural Regeneration Research2007，2，11： | 2 |
| 4 | Investigation of phase transitions for the hydrothermal formation of TiO 2 in the presence of F ? ions显示文摘 | Hongyun Yang Feng Chen Yanchao Jiao Jinlong Zhang | 2013 | Chemical Engineering Journal2013，，： | 1 |
| 5 | Paleoenvironmental Record from Wuqi Paleolake in Northern Chinese Loess Plateau显示文摘Jinding core(ZK04,36°47′35.36″N,108°19′05.24″E)is located in the northern area of Luohe river basin,northern Chinese loess plateau,lying to the southeast of Wuqi County about 20 km.The total depth of Core ZK04 is 92. | GUO Jiao WANG Wei WU Lijie CHEN Hongyun DONG Qiuyao | 2014 | Acta Geologica Sinica(English Edition)2014，88，S1： | 0 |
| 6 | Nonlinear Response of Tunnel Portal under Earthquake Waves with Different Vibration Directions显示文摘Tunnel portal sections often suffer serious damage in strong earthquake events.Earthquake waves may propagate in different directions,producing various dynamic responses in the tunnel portal.Based on the Galongla tunnel,which is located in a seismic region of China,three-dimensional seismic analysis is conducted to investigate the dynamic response of a tunnel portal subjected to earthquake waves with different vibration directions.In order to simulate the mechanic behavior of slope rock effectively,an elastoplastic damage model is adopted and applied to ABAQUS software by a self-compiled user material(UMAT)subroutine.Moreover,the seismic wave input method for tunnel portal is established to realize the seismic input under vertically incident earthquake waves with different vibration directions,e.g.,S waves with a vibration direction perpendicular or parallel to the tunnel axis and P waves with a vibration direction perpendicular to the tunnel axis.The numerical results indicate that the seismic response and damage mechanisms of the tunnel portal section are related to the vibration direction of the earthquake waves.For vertically incident S waves running perpendicular to the tunnel axis,the hoop tensile strain at the spandrel and arch foot and the hoop shear strain at the vault and arch bottom are the main contributors to the plastic damage of the tunnel.The strain is initially concentrated around the tunnel foot and spandrel,before shifting to the tunnel vault and bottom farther away from the tunnel entrance.For vertically incident S waves running parallel to the tunnel axis,very large hoop shear strain and plastic damage appear at the tunnel haunches.This strain first increases and then decreases with distance from the tunnel entrance.For vertically incident P waves running perpendicular to the tunnel axis,the maximum damage factor of the slope rock and the maximum plastic strain of the tunnel are significantly lower than for S waves.Moreover,with increasing distance from the tunnel entrance,the plastic damage to the tunnel lining rapidly decreases. | Hongyun Jiao Mi Zhao Jingqi Huang Xu Zhao Xiuli Du | 2022 | Computer Modeling in Engineering & Sciences2022，，6： | 0 |
| 7 | Selective annulation of benzamides with internal alkynes catalyzed by an electron-deficient rhodium catalyst显示文摘An electron-deficient[CpERhCl2]2 catalyzed annulation of N-pentafluorophenylbenzamides with internal alkynes was successfully established under mild reaction conditions,with the assistance of Lewis acid silver salt.Particularly,electron-deficient benzamide substrates were smoothly transformed into the desired products in this catalytic system.The catalytic system showed a broad tolerance for different substituents on the aromatic rings or aryl,alkyl-substituted alkynes. | Ping Zhang Wenju Chang Hongyun Jiao Yanshang Kang Wenxuan Zhao Peipei Cui Yong Liang Wei-Yin Sun Yi Lu | 2021 | Chinese Chemical Letters2021，32，5： | 0 |
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