Numerical analysis of the influence of structure planes on earthquake motion in rock slopes
The numerical simulation with software UDEC to the influence of structure planes on the earthquake motion of rock slopes are carried out in this paper. The study deals with the influence of the variations in the physical and mechanical parameters and attitudes as well as positions of structure planes on the intensification of earthquake motion in rock slopes. According to general situations of structure planes developing in rock slopes, two attitude types of structure planes are generalized in this paper: l) penetrating structure planes intersecting with the slope surface; 2) structure planes parallel to the slope surface. The first type of structure planes is relative to strata layers and long penetrating weak structure planes, and the second type mainly stands for unloaded joints of the rock slopes. It is revealed by numerical analyses that the variation in the damp ratio of rock mass can affect the intensification of earthquake motion in the slope to some extent, but it has little influence on the distribution of the earthquake motion in the slope; a structure plane will have significant influence on the earthquake response of the slope only if the stiffness of the structure plane is at a proper value; the shorter the distance between a structure plane and the top surface of the slope, the stronger the earthquake response of the slope; the structure plane across and dip to the slope surface will cause stranger earthquake motion in the upper slope body than that caused by structure planes horizontal or anti-dip to the slope surface; the stepper the angle of the slope surface, the stronger the earthquake motion in the top or shoulder of the slope. The laws abovementioned will be valuable references to the of earthquake stability analysis of rock slopes.
SUN Jin-zhong TIAN Xiao-fu
China University of Geosciences Beijing,Beijing 100083,China
国际会议
International Symposium and The 7th Asian Regional Conference of IAEG(国际工程地质与环境协会年会暨第七届亚洲工程地质会议)
成都
英文
451-462
2009-09-09（万方平台首次上网日期，不代表论文的发表时间）