摘要
利用基于滑面正应力调整的三维安全系数显式解法,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,端部为各种不同的曲面,计算一系列不同几何参数组合的滑体三维安全系数。结果研究表明,端部为椭球曲面安全系数最小,以下逐次为抛物曲面,圆锥曲面,指数曲面,双曲曲面,其安全系数逐渐增加。另外,还发现无论何种端部的曲面,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大于10时,F3与F2接近,此时可忽略端部效应。
By using the explicit solution of three-dimensional slope 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 different curved surfaces on the 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 factor of safety（F3/F2） of elliptical ends is the smallest and increase in order is the factor of safety（F3/F2） of parabolic ends,conic ends,exponential ends and hyperbolic ends.In addition,we find 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 10,the maximum value of F3/F2 will be smaller,the three-dimensional end effect would reduce slightly.
出处
《地下空间与工程学报》
CSCD
北大核心
2011年第3期576-580,共5页
Chinese Journal of Underground Space and Engineering
关键词
端部形状
三维
滑坡
稳定性
end shape
three-dimension
slopes
stability
