软岩巷道交岔点稳定性数值模拟研究

Numerical Simulation Research on Stability of Soft Rock Roadway Crossing

借助有限元软件ANSYS对软岩巷道交岔点的稳定性进行数值模拟分析,研究巷道交岔点的应力场及应力集中系数、收敛变形等变化规律以及软岩巷道交岔点围岩的破坏特性,对其进行稳定性评价。研究认为,软岩巷道交岔点处应力集中系数远高于其他部位的应力集中系数,其中锐角侧应力集中程度较高,容易出现稳定性问题。交岔点的收敛变形以顶板变形为主,故顶板的稳定性较差,软岩巷道交岔点两帮和拱肩是巷道的薄弱部位,稳定性较差。

The numerical simulation software ANSYS is applied to systematically study the stability of soft rock roadway crossing, the failure characteristics, change law of stress field and stress concentration factor and convergence deformation of soft rock roadway crossing are analyzed, at last, the stability evaluation of soft rock roadway crossing is put forwarded. It shows that the stress concentration factor at the roadway crossing is much higher than other parts, especially at the acute angle side, and where prone to stability problems. Because the convergence deformation of crossing is to mainly concentrate on the roof, so the roof of crossing is less stable, the spandrel and sides of soft rock roadway crossing are the weakest place, so that poor stability appears easily.