中文摘要：

利用FLAC3D软件建立边坡的三维数值模型,分别改变边坡宽高比、边坡角、岩土体内摩擦角和黏结力,采用强度折减法计算边坡安全系数。研究结果表明：随着宽高比W/H的增大,边坡安全系数明显减小,并趋于一定值;当W/H〉6,边坡问题可简化为平面应变问题;宽高比越小,边坡的三维效应越突出;当W/H〈3时,边坡三维的效应不能忽视;当坡角越小时,在相同宽高比下,稳定系数偏差越大,即边坡的三维效应越明显;随着内摩擦角的增大,边坡的三维效应逐渐减弱,且边坡滑动由深层滑动转变为浅层滑动;边坡三维效应随着黏结力的增大而增大,边坡滑动由浅层滑动转变为深层滑动,滑动面越来越缓。

英文摘要：

The three-dimensional numerical model of slope was founded by FLAC3D software, changing the ratio of width to height W/H, slope angle, friction angle and cohesion of geotechnical material to calculate the factor of safety of slope by the strength reduction method. The results show that with the increase of W/H, the factor of safety of slope decreases obviously to a constant value. If W/H〉6, the slope problem can be simplified to plane strain problem. With the decrease of the ratio of width to height, the three-dimensional effect of slope is more obvious, if W/H〈 3, the three-dimensional effect of slope cannot be neglected. Under the same W/H, the differences between three-dimensional results and two-dimensional results are larger with lower slope angle, indicating the more obvious three-dimensional effect of slope. With the increase of friction angle, the three-dimensional effect of slope gradually becomes smaller, and the failure mode of slope changes from deep slipping to shallow slipping. With the increase of cohesion, the three-dimensional effect of slope becomes more obvious, and the failure mode of slope changes from shallow slipping mode to the deep slipping mode, inclination of slip suface becomes slower.