破顶断面对围岩稳定性的影响数值模拟研究

Numerical simulation of the influence of the top breaking section on surrounding rock stability

以桃园煤矿Ⅱ1044机巷地质条件为背景,运用FLAC^(3D)数值模拟方法,对比分析巷道采用破“L”型内嵌式顶板断面与原梯形断面在开挖后不支护情况下围岩稳定性的差异。研究表明:与梯形断面相比,破顶断面垂直应力峰值减小;塑性区的差异主要在顶板上方;与梯形断面相比,破顶断面高帮位移量减少,但顶板位移量显著增大。

With the geological conditions of Taoyuan Coal MineⅡ1044 machine lane as the background,the FLAC^(3D) numerical simulation method is used to compare and analyze the difference between the stability of the surrounding rock using the broken"L"type embedded roof section and the original trapezoidal section without the support after excavation.The study shows that the vertical stress peak of the top breaking section decreases;the difference in the plastic area is mainly above the top plate,and the high gang displacement of the top breaking section decreases,but the top plate displacement is significantly increased.