露天矿区基坑边坡支护结构变形量估计方法

Estimation Method of Deformation of Foundation Pit Slope Supporting Structure in Open-pit Mining Area

该文提出露天矿区基坑边坡支护结构变形量估计方法,利用基坑边坡围护墙高度、开挖深度以及地下水深度,计算主被动水土压力,根据解得水平力对围护墙生成的弯矩,得到该水平力作用下围护墙水平变形量与剪力分布形式,获取不同深度主被动区水压力造成的变形量,并推导出不同开挖深度的支护结构变形量计算公式。选取具有永久性排桩支护结构的露天煤矿区作为实验对象,根据给定的支护结构参数与不同开挖深度估计方法参数,估计该矿区基坑边坡支护结构变形量。通过对比发现,所提方法与实际测量值误差较小,经高斯函数拟合数值曲线可知,方法峰值位置和曲线形态与实际测量数值曲线基本相符,具有相对理想的估计精准度。

In this paper,the deformation estimation method of foundation pit slope support structure in open-pit mining area is proposed.The active and passive water and soil pressure is calculated by using the height of foundation pit slope retaining wall,excavation depth and groundwater depth.According to the bending moment generated by the horizontal force to the retaining wall,the horizontal deformation and shear distribution of the retaining wall under the action of the horizontal force are obtained,the deformation caused by the water pressure in the active and passive areas at different depth is obtained,and the calculation formula of the deformation of supporting structure at different excavation depths is derived.The open-pit coal mine area with permanent row pile support structure is selected as the experimental object.According to the parameters by given support structure and different excavation depth estimation methods,the deformation of foundation pit slope support structure in the mining area is estimated.By comparing,it is found that the error between the proposed method and the actual measured values is small.According to the Gaussian function fitting numerical curve,the peak position and curve shape of the method are basically consistent with the actual measured numerical curve,and it has relatively ideal estimation accuracy.