基于FLAC3D的高速公路高边坡合理开挖施工工艺研究

Research on the Reasonable Excavation Construction Technology of Highway High Slope by FLAC3D

为了合理的确定实例边坡开挖施工工艺,分别设定不同开挖级数和开挖深度工况,采用FLAC3D软件对该边坡在不同开挖工况下的变形情况和安全系数进行数值模拟,得到:①边坡的安全系数在每一级开挖过程中逐渐减小,因此要尽量减少对边坡的扰动;②边坡每级开挖深度为15 m时边坡的稳定性最好,开挖深度过小会对原始边坡形成持续扰动,而过大则容易形成剪切破坏贯通区,2种情况都不利于该边坡的稳定。

In order to determine a reasonable excavation construction technology of example slope, this paper sets series working conditions of different excavation depths and different excavation classifica- tion numbers respectively, then use the numerical simulation to the slope under different working condi- tions by FLAC 3D, and the final conclusions are as follows ： （~）The safety factor of slope decreased gradu- ally during the process excavation at each level, so it is necessary to reduce the disturbance on slope; ~ The stability of slope is the best when the slope excavation depth of each level is 15 m, if the slope ex- cavation depth is too shallow, it must cause more disturbance to the original slope, and if the slope excava- tion depth is too deep, it is easy to form a large area of shear failure, both of the two conditions are not conducive to the stability of the slope.