某铜矿逆断层对围岩稳定性影响数值分析

Copper mine numerical simulation study of the impact of reverse fault on the surrounding rock stability

逆断层是矿山开采中经常遇到的地质构造,其岩体包含各种节理、裂隙、劈理等软弱结构面,使得其岩性发生重大改变,对附近矿体的开采产生难以预料的影响.通过FLAC3D软件建立了处于两条逆断层中间的矿体开采模型,分析矿体开采引起的围岩应力应变变化情况,研究逆断层对围岩稳定性的影响,得出逆断层改变了围岩应力由浅入深逐渐增大的层状分布规律,增大了部分区域的最大剪应力和最大主应力,特别是矿体上盘的应力,使得上盘断层出现剪切破坏区,大大增加了采场顶板的危险性,更加容易引起顶板冒落、垮塌,需引起高度重视,采取积极有效的支护措施,避免出现安全事故.

Reverse fault which includes various weak structural planes such as joint, fissure, cleavage is a geological structure often encountered in mining. With the lithology change, it makes unpredictable effects on the mining. In this paper, it builds a mining model which the orebody is in the middle of the two reverse faults by FLAC3D software, researches the influence of thrust faults on the stability of surrounding rock, and finds out the rule that reverse fault changes the distribution pattern of the surrounding rock stress gradually increase with depth, hence increases the maximum shear stress and maximum principal stress in part of the region, especially the stress above orebody, which leads to the shear failure area in upper plate fault, which significantly increases the risk of stope roof falling and collapsing. Close attention should be paid and active and effective support measures should be taken to avoid safety accidents.