The impact of multiple explosion sources on the safety of the underground cavern is enormous. Based on a similarity model test, the finite element software LS-DYNA3D was utilized to analyze the damage evolution and circumferential strain distribution characteristics of the bolt-supported cavern under the seven combinations of concentrated charge explosion sources in three places, including the side of the vault, side arch, and sidewall. The accuracy of the simulation results is verified by comparing them with test results. The research results indicate that the damage of the surrounding rock is mainly caused by the tensile stress wave reflected from the free surfaces and the superposition of the tensile stress wave. The damage of the surrounding rock in the cases of multiple explosion sources is not a simple superposition of that in the cases of a single explosion source. The peak circumferential stress and damage of the surrounding rock in the middle of two explosion sources are significantly greater than that of the cases of the corresponding single explosion source. In the seven cases, the peak circumferential strain of the cavern wall changes from tensile to compressive from the vault to the spandrel. When the explosion occurs on the sidewall, the peak circumferential strain of the floor is tensile.

中文翻译：

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多爆源下锚杆支护洞室损伤演化及周向应变分布特征

多个爆炸源对地下洞室安全的影响是巨大的。在相似模型试验的基础上，利用有限元软件LS-DYNA3D分析了锚杆支护洞室在7种集中装药爆炸源组合下的损伤演化和周向应变分布特征，包括三处集中装药爆炸源。拱顶、侧拱和侧壁。通过与试验结果的比较，验证了仿真结果的准确性。研究结果表明，围岩的破坏主要是由自由面反射的拉应力波和拉应力波叠加造成的。多爆源情况下围岩的破坏并不是单一爆源情况下的简单叠加。两个爆炸源中间的围岩峰值周向应力和损伤明显大于对应的单个爆炸源的情况。在这七种情况下，洞壁的峰值周向应变从拱顶到拱肩从拉伸变为压缩。当侧壁发生爆炸时，地板的峰值周向应变为拉伸。洞壁的峰值周向应变从拱顶到拱肩从拉伸变为压缩。当侧壁发生爆炸时，地板的峰值周向应变为拉伸。洞壁的峰值周向应变从拱顶到拱肩从拉伸变为压缩。当侧壁发生爆炸时，地板的峰值周向应变为拉伸。