浆液套管增强沿空掘进煤柱稳定性数值模拟研究

Numerical simulation on enhancing the stability of coal pillars on the goaf side by applying slurry casing pipes

为解决采动作用下沿空掘进巷道一侧窄煤柱变形等问题,现场采取浆液充填套管加固煤柱底板以改善煤柱的稳定性。采用数值模拟分析浆液充填套管对底板岩体变形的控制作用机制。数值计算结果显示,在横断面方向煤柱两侧测点变形高、中间测点变形低,近采空侧的测点变形大于近巷道侧测点变形。煤柱基底变形不一致会导致煤柱受力不均,顶板荷载作用下煤柱变形形态更加复杂。施加浆液充填套管后,煤柱基底测点的变形量减小。巷道侧煤柱底板测点变形减少20.5%,大于采空区一侧的改善效果19.2%。采动作用下随着深度增加底板岩层变形逐渐减小,施加浆液充填套管后底板岩层变形减小。对类似矿井的沿空掘进巷道一侧煤柱变形研究有指导意义。

To solve the problem of deformation of narrow coal pillars on the goaf side under mining action,slurry filling casing pipes were used on site to reinforce the floor rock masses and improve the coal pillar stability.The numerical simulation was used to analyze the control on floor rock deformation by slurry cosing pipes.The calculation results show that to the section direction,the measuring points on both sides of the coal pillar have high deformations and in the middle part show low distortion.To the gob direction,the deformation is higher than that near roadway sides.Inconsistent deformation will lead to uneven stress on the coal pillars and the deformation morphology of the coal pillars under roof stress becomes more complex.By means of slurry casing pipes,the deformation of the measuring points at the base of the coal pillar is reduced.The deformation of the measuring points at side coal pillars floor in roadways will reduce by 20.5%,which is higher than that on goaf side by 19.2%.As mining,the deformation on the floor strata will gradually reduce with the increase of depth,and the deformation of the floor strata is reduced by slurry filling.The result provides a significant guide for deformation of side coal pillars in roadways along goaf in similar mines.