加固底板对深部软岩巷道两帮稳定性影响的数值分析

Numerical analysis on influence of reinforcing floor on stability of sides in deep soft rock roadways

通过数值计算,研究了底板支护和注浆加固底板后深部软岩巷道两帮围岩的稳定性.计算结果表明,加固软弱底板后巷道两帮围岩变形量减小,尤其是巷道两帮下部围岩变形量减小幅度较大,两帮围岩塑性区范围和软化区范围缩小,两帮围岩主应力升高区范围缩小,主应力峰值区域更加靠近巷道周边.从而得出:加固软弱底板有利于提高深部软岩巷道两帮围岩稳定性.

Through numerical analysis, the stability of surrounding rock in two sides of deep roadway under the conditions of supporting and grouting in the floor was studied. The computation results show that after reinforcing the soft and weak floor, the deformation of the surrounding rock of sides gets smaller, especially, that in the lower part of the sides decreases to a larger extent; the size of plastic zones and the scope of strength-softening region in surrounding rock of sides become smaller; the area that has an increase in the maximal principal stress in surrounding rock of sides shrinks, and the zones of peak-value of maximal principal stress approach the periphery of roadway. The conclusion that reinforcing the soft and weak floor is in favor of the stability of surrounding rock of two sides in deep soft rock roadways is made.