科研之友
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摘要
Two-dimensional finite element model of Longmenshan area was built on the basis of depth study on geological structure conditions and of rock mechanical properties in Longmenshan area. Tectonic stress field and variation process of Longmenshan fault belt were inversed before the earthquake, in the earthquake and after the earthquake. The results show that: (1) the direction of maximum main stress in the study area has regionalization, according to stress direction differences before the earthquake, in the earthquake and after the earthquake and can be divided into the southwest region of Houshan fault, the middle section of Houshan fault, the region near Yingxiu of central fault, Xiaoyudong area between central fault and Qianshan fault, the region between Qingping village of central fault and Guangming village of Houshan fault, the region between central fracture and Houshan fault in the west of Beichuan. (2) there are local shear stress concentration areas in Longmenshan fault zone before the earthquake and in the earthquake, especially near Yingxiu but after the earthquake, shear stress distribution is more uniform. Shear stress concentration zone of Longmenshan central fault presents the migration at northeast, the most prominent near Yingxiu.
- 出版日期2013-8
- 单位长安大学
