循环爆破荷载作用下小净距隧道中夹岩的累积损伤特征分析

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (23) : 141-148.

论文

曹峰1,2，3，凌同华1，李洁4，黄阜1

作者信息 +

Cumulative damage feature analysis for shared rock in a neighborhood tunnel under cyclic explosion loading

CAO Feng1,2,3， LING Tonghua1， LI Jie4,HUANG Fu1

Author information +

文章历史 +

摘要

为了研究循环爆破荷载对小净距隧道中夹岩的影响，以六月田分岔隧道为工程背景，采用LS-DYNA有限元软件建立分岔隧道的三维模型。基于HJC本构模型，通过引入损伤变量，模拟循环荷载作用下小净距隧道保留岩体的累积损伤演化过程，探讨中夹岩累积损伤程度、损伤范围与爆破次数之间的关系。在此基础上，根据损伤区质点振速衰减规律，通过数据拟合，建立单次爆破装药量、最大损伤范围与临界损伤峰值质点振速之间的函数关系。最后利用现场的声波测试结果与数值模拟结果进行对比，验证数值模拟结果的合理性和准确性。研究结果表明，数值模拟结果与现场测试结果较为吻合，最大损伤范围出现在中夹岩的拱肩；相比单次爆破，循环多次爆破开挖造成的累积损伤范围明显增加，临界损伤峰值质点振速显著降低。

Abstract

To study the effects of cyclic blast loading on shared rock in a neighborhood tunnel,taking Liuyuetian bifurcation tunnel as the engineering background,a 3D model of the bifurcation tunnel was constructed using the finite element software LS-DYNA.Based on the HJC constitutive model,the damage variable was introduced to simulate the cumulative damage evolution process of the remained rock in the neighborhood tunnel under cyclic blast loading,and explore the relation among shared rock’s damage degree,damage range and explosion number.According to the decay law of mass point vibration velocity in the damage zone,the relation among single blasting charge,the maximum damage range and the critical damage mass point peak vibration velocity was established through data fitting.Finally,the simulation results were compared with those of acoustic wave tests on site to verify the rationality and correctness of the numerical simulation results.The results showed that the numerical simulation results agree well with those of tests on site,and the maximum damage zone appears on arch shoulder of shared rock; compared with a single blasting,the cumulative damage range caused by cyclic blasting excavations increases obviously,while the critical damage mass point peak vibration velocity drops significantly.

导出引用

曹峰1,2，3，凌同华1，李洁4，黄阜1. 循环爆破荷载作用下小净距隧道中夹岩的累积损伤特征分析[J]. 振动与冲击, 2018, 37(23): 141-148

CAO Feng1,2,3， LING Tonghua1， LI Jie4,HUANG Fu1. Cumulative damage feature analysis for shared rock in a neighborhood tunnel under cyclic explosion loading[J]. Journal of Vibration and Shock, 2018, 37(23): 141-148

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