摘要
利用基于滑面正应力修正的三维安全系数解法,研究三维滑体端部作用对安全系数的影响。假设滑体中部为圆柱体,端部为椭球面,计算了一系列不同几何参数组合的滑体三维安全系数。结果表明,当滑体宽度L与高度H的比值(L/H)逐渐增大时,三维安全系数F3与主滑面二维安全系数F2的比值(F3/F2)逐渐减小,当L/H=2时,F3/F2最大为1.3;当L/H=5时,F3/F2最大为1.1,当L/H>10时,F3/F2<1.05,此时可忽略端部效应。分析还发现,当土体摩擦角愈大,F3/F2将有所减小,即三维端部效应将有所减弱。
By using the explicit solution of three-dimensional landslide stability based on modification of normal stress distribution over the slip surface,the influence of the three-dimensional end effects on the factor of safety is investigated.The three-dimensional geometry of the slip surface is assumed to consist of a cylinder and elliptical ends.The values of three-dimensional factor of safety are computed with a series of combination of geometrical parameters.The computation results show that the ratio of the 3D factor of safety to the 2D factor of safety（F3/F2） will decrease with the increase of the ratio of the width to height of sliding mass（L/H）.When L/H =2,5 and 10,the maximum value of F3/F2 is 1.3,1.1 and 1.05 respectively.In addition,with the increase of the internal friction angle of the soil,F3/F2 will become smaller,that is,the three-dimensional end effect would reduce slightly.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第6期1905-1909,共5页
Rock and Soil Mechanics
基金
国家自然科学基金资助(N0.40772170)
关键词
端部分析
三维
滑坡
稳定性
end analysis
three-dimension
landslide
stability
