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双江口地下厂房岩锚梁顺序控制断裂爆破开挖轮廓成型特性

Shaping characteristics of excavation contours in sequential controlled fracture blasting of rock-anchored beams in Shuangjiangkou underground powerhouse.

作者信息

Chen Yanglong, Huang Junhong, Zhang Tengsheng, Wang Zixu, Li Xinping, Luo Yi, Liu Tingting

机构信息

School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China.

School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, China.

出版信息

Sci Rep. 2023 Sep 20;13(1):15645. doi: 10.1038/s41598-023-42590-4.

DOI:10.1038/s41598-023-42590-4
PMID:37730899
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10511498/
Abstract

Influences of high in-situ stress generally need to be considered when excavating deep underground caverns. The dynamic fracture behaviors of rocks under blast loads were investigated by using the rock-anchored beam excavation in underground powerhouses of Shuangjiangkou Hydropower Station in Sichuan Province, China as the engineering background. To solve the problems of the poor blasting breakage effect of rocks and the difficulty in protecting surrounding rocks during excavation, mechanical properties of granite under static and dynamic loads were investigated and the sequential controlled fracture blasting (SCFB) method was adopted during in-situ tests. Based on the Riedel-Hiermaier-Thoma constitutive model and the strength criterion, software LS-DYNA was employed to simulate the dynamic propagation of blasting-induced cracks. The contour shaping effect obtained via numerical simulation is generally consistent with the test results. The results show that SCFB can to some extent control the direction of crack initiation and rock fracture behavior of the blasthole wall cracks and the spacing of successive bursting holes is about 10 times the diameter of the blastholes when the cracks between the blastholes are shaped the best effect. Moreover, the magnitude and direction of principal in-situ stress can both affect the propagation path and length of blasting-induced cracks. The results of the research on the excavation and construction of deeply buried underground caverns have a certain reference value.

摘要

在开挖深部地下洞室时，通常需要考虑高地应力的影响。以中国四川省双江口水电站地下厂房的岩锚梁开挖为工程背景，研究了爆破荷载作用下岩石的动态断裂行为。为解决岩石爆破破碎效果差以及开挖过程中围岩保护困难等问题，研究了花岗岩在静动荷载作用下的力学性能，并在现场试验中采用了顺序控制断裂爆破（SCFB）方法。基于Riedel-Hiermaier-Thoma本构模型和强度准则，利用软件LS-DYNA模拟了爆破诱发裂纹的动态扩展。通过数值模拟得到的轮廓成形效果与试验结果基本一致。结果表明，SCFB在一定程度上可以控制裂纹起裂方向和炮孔壁裂纹的岩石断裂行为，当炮孔间裂纹成形效果最佳时，相邻炮孔间距约为炮孔直径的10倍。此外，原岩应力的大小和方向都会影响爆破诱发裂纹的扩展路径和长度。该研究成果对深埋地下洞室的开挖施工具有一定的参考价值。

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