论文部分内容阅读
为研究含地下采空区的岩质边坡在施工过程中的各种响应与稳定性,采用SURPAC建立某磷矿的三维地质模型。在边坡坡顶、坡角与采空区四周布置应力与位移监测点。利用接口程序将三维模型导入FLAC3D,计算露天边坡开挖过程中监测点的应力与位移。计算结果表明:坡顶与坡角水平位移与竖向反弹位移随着边坡开挖的进行越来越大,但每步开挖完成后新增的反弹位移越来越小,这与每步开挖的卸载量大小有关。坡顶监测点处于拉应力状态,坡角监测点处于压剪应力状态,在监测点所在位置开挖时,压应力显著变大。地下空区的开挖过程对空区的竖向位移与应力有极大影响,最大主应力在每步开挖完成时突然增加,且增幅很大。建议在施工过程中,加强对采空区与边坡坡顶及坡脚的位移与应力的量测,以确保施工安全。
In order to study various responses and stability of rock slope with underground goaf in the process of construction, a three-dimensional geological model of a phosphate rock was established by SURPAC. The stress and displacement monitoring points are arranged around the slope top, slope angle and goaf. The interface program was used to import the 3D model into FLAC3D to calculate the stress and displacement of monitoring points in the open slope excavation. The calculation results show that the horizontal displacements and the vertical rebound displacements of the top and slope are increasing with the excavation of the slope, but the newly added rebound displacements are smaller and smaller after each step of excavation, Excavation of the size of the unloading. The top monitoring point is in the state of tensile stress, and the monitoring point of the slope angle is in the state of compressive and shear stress. When the monitoring point is located, the compressive stress will be significantly larger. The excavation process of underground space has great influence on the vertical displacement and stress of the open space. The maximum principal stress suddenly increases when each step of excavation is completed, and increases greatly. It is suggested that during the construction process, the displacement and stress of the top and bottom of goaf and slope should be strengthened to ensure the construction safety.