Failure law of surrounding rock under underground explosion based on a new damage-virtual tensile crack model

CHENG Shufan; YE Yang; ZENG Yawu; GAO Rui

doi:10.11883/bzycj-2021-0414

Volume 42 Issue 5

May 2022

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CHENG Shufan, YE Yang, ZENG Yawu, GAO Rui. Failure law of surrounding rock under underground explosion based on a new damage-virtual tensile crack model[J]. Explosion And Shock Waves, 2022, 42(5): 055201. doi: 10.11883/bzycj-2021-0414

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CHENG Shufan, YE Yang, ZENG Yawu, GAO Rui. Failure law of surrounding rock under underground explosion based on a new damage-virtual tensile crack model[J]. Explosion And Shock Waves, 2022, 42(5): 055201. doi: 10.11883/bzycj-2021-0414

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Failure law of surrounding rock under underground explosion based on a new damage-virtual tensile crack model

doi: 10.11883/bzycj-2021-0414

School of Civil and Architectural Engineering, Wuhan University, Wuhan 430072, Hubei, China

Received Date: 2021-09-30
Rev Recd Date: 2021-11-15

Available Online: 2022-03-29

Publish Date: 2022-05-27

Abstract

Abstract

As a hidden storage space for explosive hazards, the underground cavern has a potential risk of an internal explosion. To study the mechanism of the dynamic response of the surrounding rock under an internal explosion load, a new coupled damage and virtual crack model based on the HJC (Holmquist-Johnson-Cook) constitutive model of rock and the tensile failure cohesion element of the joint is proposed. And the quasi-static uniaxial compression, Brazilian splitting experiments, and dynamic SHPB experiments were calibrated. Therefore, this model is available for the simulation of middle-high strain rate problems, such as an underground explosion. Based on the new method, a series of underground explosions in spherical caverns is simulated by the multi-material ALE algorithm. The damage range and zoning failure law of the surrounding rock are analyzed. The research shows that the insertion of cohesive elements compensates for the deficiency of the HJC materials which cannot simulate tensile failure at low hydrostatic pressure. And the size effect of the model proposed in the paper is easy to deal with. The new method in this paper considers both the propagation of tensile crack by cohesive elements and the plastic damage by the HJC model, which can reflect the failure process of rock more accurately and completely. According to the numerical simulation results, the failure law of red sandstone during filling (coupling charge) explosion shows zonal characteristics with crashed zone and fracture zone from inside to outside. The proportional radius of the crashed zone is about 0.26 m/kg^1/3, and that of the fracture zone is 0.47 m/kg^1/3. The existence of the air chamber changes the loading form and reduces the load intensity acting on the cavern. Therefore, with the increase of the chamber size, the interval effect of air can reduce the damage of the surrounding rock during the explosion. Taking the red sandstone as an example, when the proportional radius reaches 0.52 m/kg^1/3, there was no damage and no fracture generated by the explosion load. The conclusions above can be used as guidance for the anti-explosion design and protection of underground works.
- explosion-proof cavern,
- cohesive element,
- HJC (Holmquist-Johnson-Cook) model,
- cavity decoupling

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