深井高地应力巷道围岩弱化规律及控制技术

深井高地应力围岩控制是深井支护的难点,应用FLAC3D软件对深井半圆拱巷道在高地应力作用下围岩的弱化规律进行研究,发现深井高地应力围岩塑性区出现不连续分布的现象,随着时间的推移,塑性区逐渐增大,表明深井围岩属于非线性力学系统.同时,分析了不同侧压系数下的巷道围岩应力和位移,得到了在巷道纵向上和横向上两者的变化情况,以及不同地应力对深井锚喷网加锚索协同支护效果的影响.提出深井高地应力围岩高强度、高刚度以及大范围的围岩控制技术,并对不同地应力情况下的支护效果进行监测,取得了较好的支护效果.

Weakening rules and its control technology of deep & high stress roadway surrounding rock

The high ground stress surrounding rock control is difficulty of deep mine support, FLAC3D software was applied for the study of deep mine semicircle roadway surrounding rock weakening law under high ground stress, is found that the deep mine high ground stress surrounding rock appears discontinuous distribution of plastic zone, with time, the plastic zone increases, that deep mine surrounding rock belongs to nonlinear mechanical system. Meanwhile, the surrounding rock stress and displacement that under different side pressure coefficients were simulated, and got the change of the situation in the roadway on both horizontal and vertical direction, and the different ground stress impact on deep shotcrete rockbolt mesh plus cable support were analyzed. The technology was put forward for high strength, high stiffness and a wide range for deep mine with high stress surrounding rock control, and the supporting effect was monitored under different ground stress situations, and good support effect was obtained.