基于近场动力学理论的岩石双孔爆破动态断裂行为数值模拟

doi:10.19952/j.cnki.2096-5052.2023.02.04

Hazard Control in Tunnelling and Underground Engineering

2023, Vol. 5

Issue (2): 42-58 DOI: 10.19952/j.cnki.2096-5052.2023.02.04

Research Article

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Numerical simulation of dynamic fracture behavior of rock dual-hole blasting based on peridynamic theory

SUN Gang¹, WANG Junxiang^1*, MENG Xiangzhu^2,3, GUO Lianjun¹, SUN Jie¹

1. School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China;
2. Bridge Safety Engineering Innovation Center of Liaoning Province, Shenyang 110122, Liaoning, China;
3. Department of Road and Bridge Engineering, Liaoning Provincial College of Communications, Shenyang 110122, Liaoning, China

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Abstract Peridynamics theory is a new meshless method. Based on the microelastic brittle model inperidynamics, a kernel function that can reflect the internal length effect of the long-range forces varies with the distance between material points is introduced. The numerical solution program of dual-borehole rock blasting under high in-situ stress state was written by Fortran language to investigate the dynamic deformation and failure process of dual-borehole rock blasting under different borehole distance, in-situ stress states and lateral pressure coefficients, and the whole process of crack initiation, propagation and coalescence in dual-borehole rock blasting was obtained. The results showed that the crack area enlarges from 306.59 cm² to 449.07 cm² with the increase of the borehole spacing from 100 mm to 200 mm, whereas the borehole spacing rised to 200 mm, the cracks was unable to throughout which was produced by dual-borehole. At the hydrostatic in-situ stress levels, with the increase of in-situ stress, the crack propagation time reduced, the initial time of rock failure postponed, the damage area reduced from 123.24 cm² to 32.96 cm², and the main crack propagation length decreased from 87.73 mm to 14.42 mm. Under non-hydrostatic in-situ stress, the crack propagation tended to the direction of maximum principal stress. With the increase of lateral pressure coefficient, the damage area diminished and the directivity of crack propagation became increasingly apparent.The in-situ stress inhibited the crack propagation of rock, and the non-hydrostatic in-situ stress exerted a guiding effect on the crack propagation. In reality, the efficiency of rock fragmentation will be improved through selecting proper borehole distance and arranging the blasting holes along the direction of maximum principal stress which are beneficial to forming a new free surface.

Key words： dual-borehole blasting in-situ stress peridynamic numerical simulation crack propagation

Received: 01 March 2023 Published: 20 June 2023

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SUN Gang,WANG Junxiang,MENG Xiangzhu, et al. Numerical simulation of dynamic fracture behavior of rock dual-hole blasting based on peridynamic theory[J]. Hazard Control in Tunnelling and Underground Engineering, 2023, 5(2): 42-58.

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http://tunnel.sdujournals.com/EN/10.19952/j.cnki.2096-5052.2023.02.04 OR http://tunnel.sdujournals.com/EN/Y2023/V5/I2/42

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