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国家自然科学基金(50804006)

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Excavation-induced microseismicity: microseismic monitoring and numerical simulation被引量:9
2012年
The volume of influence of excavation at the right bank slope of Dagangshan Hydropower Station, southwest China, is essentially determined from microseismic monitoring, numerical modeling and conventional measurements as well as in situ observations. Microseismic monitoring is a new application technique for investigating microcrackings in rock slopes. A micro- seismic monitoring network has been systematically used to monitor rock masses unloading relaxation due to continuous exca- vation of rock slope and stress redistribution caused by dam impoundment later on, and to identify and delineate the potential slippage regions since May, 2010. An important database of seismic source locations is available. The analysis of microseismic events showed a particular tempo-spatial distribution. Seismic events predominantly occurred around the upstream slope of 1180 m elevation, especially focusing on the hanging wall of fault XL316-1. Such phenomenon was interpreted by numerical modeling using RFPA-SRM code (realistic failure process analysis-strength reduction method). By comparing microseismic activity and results of numerical simulation with in site observation and conventional measurements results, a strong correlation can he obtained between seismic source locations and excavation-induced stress distribution in the working areas. The volume of influence of the rock slope is thus determined. Engineering practices show microseismic monitoring can accurately diagnose magnitude, intensity and associated tempo-spatial characteristics of tectonic activities such as faults and unloading zones. The integrated technique combining seismic monitoring with numerical modeling, as well as in site observation and conventional surveying, leads to a better understanding of the internal effect and relationship between microseismic activity and stress field in the right bank slope from different perspectives.
Nu-wen XUChun-an TANGHong LIFeng DAIKe MAJing-dong SHAOJi-chang WU
水力压裂裂缝穿层及扭转扩展的三维模拟分析
应用并行有限元程序对水力压裂过程进行真三维数值模拟,实现对压裂裂缝起裂、扩展及扩展中的穿层、扭转行为的全过程分析;数值计算中无需假定压裂裂缝的起裂位置和扩展路径,即可根据实际岩体水力学模型的力学、水力学等边界条件,自动标...
李连崇梁正召李根马天辉
关键词:岩石力学水力压裂并行计算裂缝数值模拟
动荷载作用下三点弯曲梁的破坏形式与偏置裂纹位置的关系研究
为了研究含偏置裂纹的三点弯曲梁两种破坏形式转换时对应的偏置裂纹临界位置的规律。本文使用RFPA2D-Dynamic软件,对含偏置裂纹的三点弯曲梁进行了数值模拟,并考虑了加载峰值和材料均质度的影响,得出了两种破坏形式转换所...
贾敬辉张永彬
关键词:三点弯曲梁动荷载数值模拟
OpenMP在岩石动力并行计算中的应用
随着多核CPU的普及,多核并行计算技术成为提高科学研究与工程计算效率的一种有效途径。采用OpenMP并行模式,对二维弹性动力学有限元刚度并行化处理,提出了刚度矩阵并行组装策略,利用共享内存并行直接求解器Pardiso进行...
张永彬唐春安贾敬辉梁正召
关键词:岩石动力学OPENMP并行计算有限元加速比
一个可用于全耦合固结分析的低阶稳定新单元
平面四节点双线性同阶插值单元(Q4P4)在求解全耦合固结方程时,由于受到Zienkiewicz-Taylor分片试验和Babuska-Brezzi条件限制,往往使计算结果发散。构造了一个低阶稳定新单元(Q4P4-ACE)...
李根唐春安李连崇
关键词:固结
NUMERICAL SIMULATION OF PILLAR FAILURE PROCESS AND STABILITY ANALYASIS
Roof falling and floor heave of roadway and pillar failures are important problems of rock mechanics in mining...
NUWEN XU School of Civil and Hydraulic Engineering Dalian University of Technology
NUMERICAL ANALYSIS OF THREE-DIMENSIONAL FRACTURE SPACING IN LAYERED ROCKS BY PARALLEL COMPUTING
Spacing of opening-mode fractures in a layered system is an important research topic in mechanical engineering...
ZHENGZHAO LIANG School of Civil and Hydraulic Engineering Dalian University of Technology
有自由面渗流的流量控制全域迭代法
有自由面的渗流问题属于边界非线性问题,求解复杂,一直是岩体水力学研究的重点和难点之一,固定网格法由其诸多优点被广泛采用。在对多种固定网格算法总结基础上提出了基于流量控制的全域迭代有限元方法,该方法具有一次形成总体传导矩阵...
李根李连崇唐春安
关键词:渗流自由面
微震监测技术在大岗山水电站右岸边坡中的应用
大岗山水电站右岸边坡地质条件复杂,断层、岩脉、卸荷裂隙密集带、深部卸荷带及节理裂隙发育。为了监测边坡在开挖过程中引起的卸荷松弛和后期大坝蓄水引起的应力重分布,以及对由此造成的边坡潜在滑动区域进行识别和圈定,采用高精度微震...
徐奴文唐春安吴思浩李桂林杨菊英陈冰
关键词:大岗山水电站微震监测
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