不同冲击速度条件下矩形巷道围岩变形-开裂过程数值模拟

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (14) : 94-101.

论文

王学滨1,2，田锋2，白雪元2，郭翔2

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Numerical simulation on the deformation-cracking process of rectangular tunnel surrounding rock under different impact velocities

WANG Xuebin1,2，TIAN Feng2，BAI Xueyuan2，GUO Xiang2

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摘要

利用自主开发的拉格朗日元与变形体离散元耦合的连续-非连续方法开展了不同冲击速度条件下矩形巷道围岩变形-开裂过程的数值模拟研究。当岩石单元的应力满足剪切开裂判据时，考虑了应力脆性跌落效应，在此过程中，围压保持不变。为了检验该方法的正确性，开展了单轴压缩条件下岩样变形-开裂过程的数值模拟研究。针对矩形巷道围岩的计算表明：1）冲击速度低时载荷-位移曲线呈单峰特点；冲击速度高时载荷-位移曲线呈多峰特点；2）冲击速度低时围岩的开裂呈渐进性特点；冲击速度高时围岩的开裂呈间歇性特点，这与在冲击过程中围岩中过去形成的一种较为稳定的结构（拱）被打破，并在其外围形成了新的稳定结构（拱）有关；3）在模型相同垂直方向位移时，冲击速度低时围岩两帮的开裂深度较大，这说明冲击速度低时应力的传递较为均匀，冲击速度低时的结果（例如，V形坑内岩石碎块涌入巷道）与围岩的片帮类似；冲击速度高时的结果（例如，岩石碎块的弹射现象）与岩爆类似。

Abstract

Using a continuum-discontunuum method where the Lagrangian element method and deformational discrete element method were combined, deformation-cracking processes of the rectangular tunnel surrounding rock under different impact velocities was modeled numerically. When stresses acting on rock elements satisfy the shear failure criterion, the stress drop in the form of brittleness was considered, in which the confining pressure remains constant. To validate the present method, the deformation-cracking process of a rock specimen in uniaxial compression was modeled numerically. It is found from results of the rectangular tunnel surrounding rock that: 1) at lower impact velocities, load-displacement curves of the surrounding rock exhibit a single peak, while at higher impact velocities they exhibit several peaks; 2) at lower impact velocities, the failure of the surrounding rock is progressive, while it is intermittent at higher impact velocities, which is related to the fact that the previous arch fails during the impact process and a new larger arch is formed; 3) at the same vertical displacement of the surrounding rock, the cracking depth of two sides of the surrounding rock is larger at lower impact velocities than at higher impact velocities, indicating a relatively uniform stress propagation at lower impact velocities. Results (for example, rock blocks in V-shape notches are squeezed into the tunnel) at lower impact velocities are similar to rib spalling of two sides of the surrounding rock, while results (such as ejections of rock blocks) at higher impact velocities are similar to rockbursts.

导出引用

王学滨1,2，田锋2，白雪元2，郭翔2. 不同冲击速度条件下矩形巷道围岩变形-开裂过程数值模拟[J]. 振动与冲击, 2020, 39(14): 94-101

WANG Xuebin1,2，TIAN Feng2，BAI Xueyuan2，GUO Xiang2. Numerical simulation on the deformation-cracking process of rectangular tunnel surrounding rock under different impact velocities[J]. Journal of Vibration and Shock, 2020, 39(14): 94-101

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