An Analysis of the Overturning Stability of Rock Slope under Water Pressure and Earthquake
KE Jian1,DENG Qin2
,LLIANG Dong-cai2,3
,DUAN Wen-zheng4,LI Rui4
Author information+
1. Xishuangbanna Jinghai Highway Construction Investment Co. Ltd.,Jinghong 666100,Yunnan Province,China;
2.State Key Laboratory of Geo-mechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy
of Sciences,Wuhan 430071,Chi
The overturning failure around the toe of the slope is a frequent failure mode of the rock slope under external loads. Based on the principle of moment balance,the expression of anti - overturning stability coefficient of the rock slope under the earthquake,new water pressure distribution and the load of the top of slope is solved. Firstly,the rationality of different water pressure distribution forms and its influence on stability coefficient are analyzed. Then the effects of seismic load,fissure water depth and load of the top of slope on overturning stability are analyzed. The following conclusions can be drawn: ① The new proposed water pressure distribution form ( the midpoint of the structural plane and the water pressure at the bottom of the crack is fixed) overcomes the original water pressure distribution form ( The hydrostatic pressure at the bottom of vertical tensile crack is maximum) and improved the water pressure distribution form ( the hydrostatic pressure at 1 /2 of the groundwater level is maximum) ,it is more reasonable to use the new water pressure distribution form for rock slope
stability analysis. ② The outflow seam blocking,the increase in the depth of the fracture water,and the equivalent seismic loading which horizontally outwards the slope and upward vertically are unfavorable for the stability of the rock slope. ③ The slope anti-overturning stability coefficient decreases as the horizontal seismic coefficient increases,regardless of whether the outflow joint is blocked or not; ④ The overload of the slope's top is conducive to the stability of the slope.
KE Jian,DENG Qin,LLIANG Dong-cai,DUAN Wen-zheng,LI Rui.
An Analysis of the Overturning Stability of Rock Slope under Water Pressure and Earthquake[J].China Rural Water and Hydropower, 2019(3): 127-131