混凝土强度对立井穿煤层期间井筒围岩稳定性影响分析

Influence of concrete strength on shaft surrounding rock stability during shaft crossing coal seam

为了探究混凝土强度对立井穿煤层期间井筒围岩稳定性的影响,在对围岩力学特性测试的基础上,结合数值模拟方法对不同混凝土强度在立井穿煤层过程中围岩变形量、应力、塑性区影响机制进行分析。研究结果表明:井筒穿煤层期间的应力、塑性区、变形量分布存在明显的夹层效应,C50混凝土能将变形量、应力、塑性区相较于C30分别减少64%、28%、69%,高标号混凝土对井筒围岩应力和变形有更好的控制效果,能有效抑制塑性区发育。

In order to explore the influence of concrete strength on the stability of shaft surrounding rock during shaft crossing coal seam,based on the test of surrounding rock mechanical properties,combined with numerical simulation method,the influence mechanism of surrounding rock deformation,stress and plastic zone of different concrete strength during shaft crossing coal seam is analyzed.The results show that there is an obvious interlayer effect in the distribution of stress,plastic zone and deformation during the shaft passing through the coal seam.C50 concrete can reduce the deformation,stress and plastic zone by 64%,28%and 69%respectively compared with C30.High grade concrete has a better control effect on the stress and deformation of shaft surrounding rock and can effectively inhibit the development of plastic zone.