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玉树地震震前甘孜—玉树断裂局部应力场时空偏转特征的离散元模拟研究

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地球学报 2024年第2期45卷 203-216页

作者：张涛苏占东孙进忠张建勇唐磊周剑王磊张明磊防灾科技学院地质工程学院河北三河065201 河北省地震灾害防御与风险评价重点实验室河北三河065201 中国地质大学(北京)工程技术学院北京100083 中国地震台网中心北京100045 北京工业大学城市与工程安全减灾教育部重点实验室北京100124

区域地质构造活动会改变地壳的应力状态,构造地震是区域地质构造活动的极端方式,了解震前发震断裂局部应力场的变化规律对断裂活动性的表征具有重要意义。为此,利用颗粒离散元软件PFC~(2D),以玉树地震台站YRY-4钻孔应变仪的监测数据为依... 详细信息

区域地质构造活动会改变地壳的应力状态,构造地震是区域地质构造活动的极端方式,了解震前发震断裂局部应力场的变化规律对断裂活动性的表征具有重要意义。为此,利用颗粒离散元软件PFC~(2D),以玉树地震台站YRY-4钻孔应变仪的监测数据为依据,模拟2010年4月14日玉树M_S 7.1级地震发震断裂,甘孜—玉树走滑断裂,震前局部应力场最大主应力方向的时空偏转特征。研究表明,震前玉树台站位置的模拟最大水平主应力SH方向出现逆时针偏转,在积累了一定应变能后偏转逐步恢复,模拟局部应力方向的变化趋势与现场实际观测结果基本一致。断裂处不同位置SH变化规律不同,距离断裂构造越近,局部应力受到的扰动越明显;位于拉应力集中区的SHT和压应力集中区的SHP同时向两者所在区域的分界方向旋转,且偏转角随时步的增加逐步增大;不同区域的应力积累程度不同,且随着加载时间的推移而增强,并在不同时刻发生破裂,具有明显的时空异步效应。

关键词：玉树地震甘孜—玉树断裂离散元局部应力场偏转角

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地质力学模型实验中变形量测方法的应用研究

地质论评 2024年第1期70卷 287-308页

作者：苏占东王鸷文孙进忠张建勇梁金平牛耀张之泰曾扬农李梦园防灾科技学院地质工程学院河北三河065201 河北省地震灾害防御与风险评价重点实验室河北三河065201 中国地质大学(北京)工程技术学院北京100083 中铁十八局集团第五工程有限公司天津300456

地质力学模型实验作为一种便捷高效、成本低廉的研究方法,不仅可以将工程的破坏过程直观地呈现出来,而且可以作为了解工程整体力学特征、破坏模式和稳定情况的重要研究手段,在各类岩土工程问题的研究中有着广泛应用。由于地质力学模型... 详细信息

地质力学模型实验作为一种便捷高效、成本低廉的研究方法,不仅可以将工程的破坏过程直观地呈现出来,而且可以作为了解工程整体力学特征、破坏模式和稳定情况的重要研究手段,在各类岩土工程问题的研究中有着广泛应用。由于地质力学模型材料的变形模量较低,同等应力条件下应变极其敏感,因此模型实验中变形测量显得至关重要。为了提升地质力学模型实验中变形量测的便捷性和准确性,对目前地质力学模型中变形测量的主要方法进行总结分析。结果表明:目前对于模型变形量测的方法主要分为电测式测量方法、光学测量方法和机械式测量方法,其中电测式测量方法主要包括电阻式应变片法和位移计法,光学测量方法主要包括光纤类传感器法、数字图像相关法、光弹性贴片法和云纹干涉法,机械式测量方法主要包括百分表测量法和经纬仪观测法。通过对各种方法工作原理、主要应用案例及优缺点的阐述对比,得出不同方法的主要区别是测量范围和适用范围的差异,其中百分表测量法适用于测量小区域变形;测量内部变形可选择电阻式应变片法及光纤类传感器法;较大区域的变形可选择位移计法及光纤类传感器法;指定点位移可选择经纬仪观测法;全场观测可选择数字图像相关法、云纹干涉法以及光弹性贴片法。该成果可为相关地质力学模型实验的变形测量提供实验参考。

关键词：地质力学模型变形测量电测法光学测量方法机械式测量方法

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岩体物理模拟实验中的相似材料配比

吉林大学学报（地球科学版） 2024年第5期54卷 1645-1656页

作者：牛耀苏占东孙进忠张昊吴雪丽林淇七王鸷文李梓檬朱焕欣张建勇梁金平防灾科技学院地质工程学院河北三河065201 河北省地震灾害防御与风险评价重点实验室河北三河065201 中国地质大学(北京)工程技术学院北京100083

为确定岩体物理模拟实验中常见相似材料的配比,首先选取河砂、重晶石粉、石膏和水泥四种原料,采用正交设计的方法,设置骨胶比(河砂和重晶石粉质量与石膏和水泥质量之比)、水膏比(水泥质量与石膏质量之比)和重晶石掺量(重晶石粉质量与骨... 详细信息

为确定岩体物理模拟实验中常见相似材料的配比,首先选取河砂、重晶石粉、石膏和水泥四种原料,采用正交设计的方法,设置骨胶比(河砂和重晶石粉质量与石膏和水泥质量之比)、水膏比(水泥质量与石膏质量之比)和重晶石掺量(重晶石粉质量与骨料质量之比)3个因素,每个因素5个水平,开展单轴压缩情况下的密度试验和声发射试验,然后确定不同配比对相似材料物理力学指标和表征损伤程度指标(D)的敏感性。试验结果表明:在骨胶比影响下,相似材料密度、抗压强度和弹性模量的极差最大,分别为0.13 g/cm^(3)、2.60 MPa和247 MPa,F检验值最大,显著性最高;在重晶石掺量影响下,泊松比的极差最大,为0.09,同样显著性最高;在骨胶比影响下D的极差最大,为0.25,显著性最高。总的来说,骨胶比对相似材料密度、抗压强度、弹性模量和D起控制作用,重晶石掺量对泊松比起控制作用;重晶石掺量最优为20%。

关键词：物理模拟实验相似材料正交设计敏感性损伤特征

Mathematical-Physical Modelling of Seismic Response of the Beijing Depression

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Acta Geologica Sinica(English Edition) 1988年第2期1卷 141-158页

作者： Peng Yimin sun jinzhong Hao Xiansheng China University of Geoscience, Beijing Central Research Institute of Building and Construction, Ministry of Metallurgical Industry, Beijing China University of Geoscience Beijing China

There is a NE-trending earthquake hazard anomalous zone in the western part of the area of the city ofBeijing proper. A comprehensive study of it has been made. In the study the two-dimensional finite element dy-namic analysis and supersonic seismic model experiments were conducted for the first time. and some prelimi-nary results have been achieved. The Beijing depression, a lower order tectonic unit in the Beijing downwarp, is just located below theearthquake hazard anomalous zone. Analysis of the experimental results shows that the topography of the bu-ried bedrock is the main factor responsible for the presence of the anomalous zone. Besides. thetwo-dimensional mathematical analysis has more marked advantages in reflecting the lateral inhomogeneity ofthe foundation as compared with the one-dimensional one. and the supersonic seismic model experiments mayreflect the integrated effects of the earthquake sources, path of wave propagation and site geological structurein an all-round way.

关键词： mode In show

EXPLORATION AND APPLICATION OF SEISMIC ANALYSIS IN THE WAVE VELOCITY TEST OF ROCK MASS IN SITU

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EXPLORATION AND APPLICATION OF SEISMIC ANALYSIS IN THE WAVE ...

General regularity of dynamic responses of slopes under dynamic input

The 2nd International Conference on New Development in Rock Mechanics and Rock Engineering

作者： jinzhong sun CHENGHU WANG JINGRU LIU College of Engineering and Technology China University of Geosciences Unit 92181 People's Liberation Army of China

＜正＞Wave velocity test in situ is an important approach to explore the engineering properties of the rock *** practice,many factors may affect the waveforms,so precise traveling time of seismic phases is seldom measured from the wave *** order to overcome this obstacle,a series of rules and criteria for seismic phase analysis are put forward in this *** rational

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Science China(Technological Sciences) 2003年第Z1期46卷 120-132页

作者： QI Shengwen, WU Faquan & sun jinzhong Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China College of Engineering Technique, China University of Geosciences, Beijing 100083, China Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China China Univ Geosci Coll Engn Techn Beijing 100083 Peoples R China

Through lots of numerical simulations with FLAC3D, dynamic responses of slopes are comprehensively studied in this paper and the general regularities of the isoline of the coefficient of the displacement, velocity and acceleration of the slope section are reached. Given a certain material slope, if the height of the slope is less than a certain value, the displacement, velocity and acceleration linearly enlarge with elevation in the vertical direction; if the height of the slope surpasses the certain value, the displacement,velocity and acceleration do not linearly enlarge with elevation any more, on the other hand, they fluctuate with a certain rhythm. At the same time, the rhythm appears in the horizontal direction, and the displacement, velocity and acceleration of the slope surface enlarge near the slope surface. The distribution form of the isoline of the coefficient of displacement, velocity and acceleration in the section of the slope is remarkably affected by the slope angle. In the certain area near the slope surface, the isoline of displacement,velocity and acceleration is parallel to the surface of the slope; in the mean time the strike direction of the extremum area is parallel to the surface of the slope, too. The charts of the slope dynamic responses can be depicted with two indexes, one is the strike direction of the isoline, and the other is the number of the rhythm extremum area of the direction parallel to the surface of the slope.

关键词： slope, dynamic response, regularity, rhythm.

Analysis of Slope Stability with Dynamic Overloading from Earthquake

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Journal of Earth Science 2012年第3期23卷 285-296页

作者：赵体孙进忠张彬李程 School of Engineering&Technology China University of Geosciences

The analysis of slope earthquake stability is one of the most important research subjects in geotechnical engineering and earthquake *** different concepts of slope earthquake stability are put forward：strength reserve stability and dynamic overloading *** first concept of slope earthquake stability has been widely accepted,and relative analysis methods are also well de-veloped;the second one,however,is seldom mentioned until now,and the failure criterion and the analysis method based on this concept are yet to be *** are researched are just the failure criterion and the analysis method of dynamic overloading earthquake *** criterion of critical earthquake peak acceleration for the dynamic overloading stability of a slope and its analysis method,the load increasing method（LIM）,are put *** dynamic overloading earthquake stability of a loess slope at Changshougou（长寿沟） in Baoji（宝鸡） City,Shaanxi（陕西） Province,China,is analyzed with *** analysis result reveals that the dynamic overloading earthquake stability of the slope is quite high to the action of the earthquake ground motion,with exceeding probability of 10% in the next 50 years.

关键词： slope dynamic overloading earthquake stability load increasing method criticalearthquake peak acceleration.

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Active Participation

Beijing Review 2006年第50期49卷 10-12页

作者： By sun jinzhong The author is a research fellow at the China Institute of International Studies

The article discusses the multilateral diplomatic activities of China for the year 2006. The leaders of the country attended numerous meetings with other countries including the Asia-Pacific Economic Cooperation, Shanghai Cooperation Organization and the China-ASEAN Commemorative Summit. The multilateral diplomacy of the country is based on its need to develop comprehensive strength. It is suggested that the country needs to participate in international cooperation to deal with international problems.

关键词： ASEAN

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反恐合作与中美关系

国际问题研究 2005年第2期 15-18页

作者：孙晋忠中国国际问题研究所

国际反恐斗争是中国和美国新的利益契合点.中美反恐合作是促进双方关系的一个新动力,和推动两国关系进入一个相对稳定与成熟时期的重要因素.

关键词：反恐合作国际反恐斗争两国关系中美关系相对稳定利益契合点双方关系促进成熟