基于Hoek-Brown准则的数值模拟计算参数的研究

Study on Calculation Parameters of Numerical Simulation Based on the Hoek Brown Principle

数值模拟中岩体力学参数的确定是非常重要的。详细介绍了M.Georgi法和Hoek-Brown法确定岩体力学参数的基本原理,以东升庙铅锌矿的岩体力学参数确定研究为例,以室内岩石试验为基础,测出岩块试件的物理力学参数,再综合考虑岩体节理裂隙的影响,并最终确定岩体力学参数。通过用FLAC3D数值模拟软件建立该矿的矿柱回收模型,进行地表沉降位移模拟,并对该矿区2号矿体的间柱和采空区顶板的3个位置的位移模拟曲线和同等位置的位移实测曲线分别进行比较,结果表明,通过Hoek-Brown法所确定的岩体力学参数较接近实际情况,可以作为该矿间柱回收模拟的基础数据。

It is important to determine rock mass mechanics parameters in numerical simulation. The basic principles of M. Georgi method and Hock Brown method of determining the mechanical parameters of rock mass are introduced in de- tail. Taking research on determining rock mass mechanical parameters in Dongshengmiao Lead-zinc Mine as an example, and based on the physical and mechanical parameters of rocks at indoor laboratory tests ,the effect of rock joints and fissures was considered to eventually determine rock mechanics parameters. The recovery model of the ore pillar was built by FLAC3D nu- merical simulation software, to simulate the surface displacement settlement. Then, the simulation displacement curve of three positions at columns and goal roofs of No. 2 ore body were compared with the measured displacement curve at the same place. The comparison results showed that the rock mechanics parameters determined by Hock-Brown method were closer to the actual situation, which can be used as the basic data for simulating the recovery of rib pillars.