Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Earthquake》 2003-03
Add to Favorite Get Latest Update

Numerical simulation of precursory phenomenon before fracture of rocks containing incompetent layer

LIANG Zheng-zhao,TANG Chun-an,YANG Tian-hong,JIAO Min-ruo(Center for Rockburst and Induced Seismicity Research, Shenyang 110004, China)  
A numerical code RFPA2D is used to simulate the failure process of a rock sample with fault material during compression. We select six points to monitor t he spatio-temporal distribution of stress, displacement and acoustic emission d uring fracture nucleation and failure under constant displacement load. The resu lts show that the stress and displacement of the same point at different time or different points at the same time are not the same, and stress, displacement an d AE show a series of complicated spatio-temporal images. The observed phenomen a do not occur randomly but follow some principle and physical process. From the results it is also found that the variation of displacement depended on fault s tructure closely. Stress is built up both in the strong asperities, but stress i s very lower in and adjacent to the fault. Stress and displacement change greatl y as well as acoustic emission change greatly when the sudden collapse occurs. T he simulation provides a physical model based on RFPA forecasting. Because the v ariations of displacement and stress are more important than the value of themse lves, anomaly of one physical parameter does not lead to a certain fracture.
【Fund】: 国家重点基础研究发展规划973项目(G1998040700);; 国家自然科学基金(50174013)
【CateGory Index】: P315.72
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved