基于应变软化模型的软岩高边坡过程稳定性研究

Process stability of soft rock high slope based on strain softening model

为了研究软岩边坡开挖过程中及支护后的稳定性变化规律,基于应变软化模型采用FLAC3D软件对边坡开挖过程中的变形、塑性区分布、安全系数的变化以及采取不同处治措施的支护效应进行计算分析。研究结果表明:用FLAC3D软件建立的应变软化模型能够较好地反映软岩边坡应变软化特性;在软岩边坡开挖过程中,铅直位移和水平位移呈现出逐渐增大的趋势,各特征点铅直位移总体上大于水平位移;边坡剪切、张拉塑性区分布主要集中在边坡表层2～4m范围内;在开挖过程中,边坡安全系数逐渐降低;采用全长注浆锚杆对边坡进行支护能有效控制边坡变形,且安全系数降低。

In order to study the change law of stability during the soft rock slope excavation process＆after supporting, the deformation,plastic zone distribution,changes of safety coefficient and retaining effect were calculated and analyzed by taking FLAC3 Dsoftware based on strain softening model and different treatment measurements during the slope excavation process.The results show that the strain softening model can reflect the strain softening properties of soft rock slope better by taking the strain softening model with FLAC3 Dsoftware.During the soft rock slope excavation process, the vertical and horizontal displacements increase gradually,and in general,for each feature point,the vertical displacement is greater than the horizontal displacement.The distribution of slope shear and tension plastic zone mainly concentrate on the slope surface layer within 2-4 m.The slope safety factor is gradually reduced during the slope excavation process,and the slope deformation＆safety coefficient reducing can be controlled by taking the grouting bolt for supporting the slope.