爆破荷载作用下隧道围岩裂隙范围计算方法研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (8) : 260-269.

论文

李芳涛1，胡志平1,2，陈南南1，张永辉1，安学旭1

作者信息 +

A study of fracture range of tunnel surrounding rock under blasting

LI Fangtao1, HU Zhiping1,2, CHEN Nannan1, ZHANG Yonghui1, AN Xuexu1

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摘要

爆破荷载下隧道围岩产生的裂隙为岩溶发育和地下水运动创造了良好的条件。为了研究爆破荷载作用下隧道围岩的损伤裂隙范围，在考虑中主应力和环向拉应力的影响下，分别基于统一强度准则和摩尔库伦强度准则得到了两种粉碎区的计算方法，并且计算了破裂Ⅰ区和破裂Ⅱ区的范围。最后开展了现场实验和探测，按本文计算方法计算了现场隧道粉碎区和裂隙区范围，计算结果与现场实验结果进行了对比和验证，得到了以下结论：（1）本文基于统一强度理论的粉碎区范围计算方法考虑了塑性损伤，适用于隧道粉碎区范围的计算，理论计算结果与现场粉碎区实测结果较为吻合，该方法可用于超欠挖控制严格的隧道爆破参数设计；（2）本文基于摩尔库伦强度准则的粉碎区范围计算方法不考虑塑性损伤，相比已有的基于摩尔库伦强度准则的计算方法考虑了环向拉应力，计算单元体更符合实际受力情况，本文粉碎区的两种计算方法主要区别在于是否包含塑性损伤的范围，两种计算方法在实际运用时，应根据不同的工程要求来选择；（3）现场实验结果表明，基于统一强度理论的破裂区范围的计算方法，其计算结果与现场实测结果较为接近，该方法可以用来计算和评估远场振动效应作用下隧道围岩的裂隙范围。

Abstract

The Fractures of tunnel surrounding rock under blasting load create good conditions for karst development and groundwater movement. In order to study the fracture range of surrounding rock under blasting load, considering the influence of medium principal stress and circumferential tensile stress, two kinds of calculation models of crushing area are obtained based on unified strength criterion and Mohr Coulomb strength criterion respectively. When the crushing area is filled with blasting gas, the secondary expansion range of fracture is calculated. Then, the scope of crushing area and fracture area is calculated through an engineering example, and the calculation results are compared and verified with the site experiment results. Finally, the following conclusions are obtained: (1) The calculation method of crushing area based on unified strength theory considers plastic damage, which is suitable for the calculation of tunnel crushing area. The theoretical calculation results are in good agreement with the site experiments results. This method can be used to design blasting parameters of tunnel with strict control of over excavation and under excavation; (2) The calculation method of crushing area based on Mohr Coulomb strength criterion does not consider plastic damage. Compared with the existing calculation methods based on Mohr Coulomb strength criterion, the circumferential tensile stress is considered, and the calculation unit body is more in line with the actual stress situation. The main difference between the two calculation methods of crushing area in this paper is whether the range of plastic damage is included. The two calculation methods should be selected according to different engineering requirements in practical application; (3) The site experiment results show that the calculation results of the fracture zone range based on the unified strength theory are close to the site experiments results, and this method can be used to calculate the fracture range of tunnel surrounding rock under similar blasting action.

关键词

爆破荷载

/ 围岩裂隙 / 粉碎区 / 统一强度理论

Key words

blasting load

/ surrounding rock range / crushing area / unified strength theory

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李芳涛1，胡志平1,2，陈南南1，张永辉1，安学旭1. 爆破荷载作用下隧道围岩裂隙范围计算方法研究[J]. 振动与冲击, 2022, 41(8): 260-269

LI Fangtao1, HU Zhiping1,2, CHEN Nannan1, ZHANG Yonghui1, AN Xuexu1. A study of fracture range of tunnel surrounding rock under blasting[J]. Journal of Vibration and Shock, 2022, 41(8): 260-269

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