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采用提出的连续-非连续介质方法,对逐步卸荷条件下圆形巷道围岩中应力波传播、压缩位移控制加载条件下圆形及矩形巷道围岩的变形-开裂-垮塌过程进行了模拟.通过将逐步卸荷条件下圆形巷道围岩的径向及环向应力的数值解和解析解进行对比,验证了本文方法连续介质部分的正确性;研究了卸荷时间及局部自适应阻尼系数对卸荷过程的影响;给出了巷道围岩中应力波传播过程及其变形-开裂-垮塌过程.计算结果表明,卸荷过程越短,围岩的动力响应越明显,围岩达到平衡状态越慢;局部自适应阻尼系数越大,围岩能量消耗越快,越有利于围岩的快速平衡,但越不利于应力波在围岩中传播;当加载的位移达到一定值时,围岩开裂,一些单元从巷道表面脱离,顶板冒落,底板底鼓,随后,许多单元被挤入或落入巷道内,最终导致围岩垮塌.
The deformation-cracking-collapse process of surrounding rock in circular and rectangular roadway with stress-wave propagation and compressive displacement control under the condition of progressive unloading is simulated by the proposed continuum-discontinuum method. By comparing the numerical and analytical solutions of the radial and circumferential stress of surrounding rock under the gradual unloading condition, the correctness of the continuum medium of this method is verified. The unloading time and local adaptive damping coefficient The influence of the unloading process on the unloading process and the process of stress wave propagation and its deformation-cracking-collapse process are given. The calculation results show that the shorter the unloading process is, the more obvious the dynamic response of the surrounding rock is and the surrounding rock reaches the equilibrium state The slower the local adaptive damping coefficient is, the faster the energy consumption of the surrounding rock is, which is more conducive to the rapid balance of surrounding rock, but the less conducive to the stress wave propagation in the surrounding rock. When the displacement reaches a certain value, the surrounding rock Cracking, some units detached from the surface of the roadway, the roof slipped and the floor bottomed, subsequently many units were pushed into or dropped into the roadway, eventually causing the surrounding rock to collapse.