恒定载荷作用下巷道围岩承载特性数值模拟研究

不同锚杆支护参数条件下，围岩形成的锚固承载体的承载性能不同。采用数值模拟软件，研究了围岩在支护后，锚杆支护参数与锚固复合承载体的关系。研究得出:随着支护密度的增大，围岩承载体强度逐渐增大、围岩两帮塑性区范围逐渐变小、垂直应力峰值逐渐由深部向浅部转移、围岩变形量小；随着锚杆长度的增加，应力峰值越靠近两帮、应力值也越大。但是锚杆长度达到一定值时，承载体强度的增长幅值逐渐减小；随着锚杆直径的增大，巷道的围岩变形量逐渐减小。研究为巷道围岩的控制提供了借鉴。

Numerical simulation study on bearing characteristics of roadway surrounding rock under constant load

Under different bolt support parameters，the bearing capacity of the anchorage formed by surrounding rock is different.In this paper，numerical simulation software is used to study the relationship between bolt support parameters and anchor composite support after surrounding rock support.The study shows that with the increase of support density，the strength of surrounding rock bearing body gradually increases，the plastic zone of the surrounding rock becomes smaller，the vertical stress peak gradually shifts from the shallow part and the surrounding rock deformation is small；as the length of the bolt increases，the closer the peak stress is to the two sides，the greater the stress value is.However，when the length of the bolt reaches a certain value，the growth amplitude of the bearing body gradually decreases；as the diameter of the bolt increases，the deformation of the surrounding rock of the roadway gradually decreases.The study provides a reference for the control of surrounding rock in the roadway.