Crack Propagation Caused by Slope Excavation Blasting Based on Stress and Velocity Time History Analysis

LIANG Rui; WANG Shu-jiang; ZHOU Wen-hai; HUANG Xiao-bin; XIONG Zheng-yu; WANG Jian-yong

doi:10.11988/ckyyb.20180614

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Journal of Changjiang River Scientific Research Institute ›› 2019, Vol. 36 ›› Issue (12) : 71-77. DOI: 10.11988/ckyyb.20180614

ROCKSOIL ENGINEERING

Crack Propagation Caused by Slope Excavation Blasting Based on Stress and Velocity Time History Analysis

LIANG Rui¹, WANG Shu-jiang¹, ZHOU Wen-hai¹, HUANG Xiao-bin², XIONG Zheng-yu², WANG Jian-yong³

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Abstract

A slope model with single blasting hole was established using ANSYS/LS-DYNA to study the characteristics of crack propagation during single-hole blasting. The crack morphology was simulated based on two forms of energy release during blasting. The time-history curves of stress and velocity of crack tip elements in three different locations were compared and analyzed. Research findings suggest that the change rate of stress and change rate velocity of crack tip element can be used to analyze different crack propagation patterns. Increase in the change rate of stress at crack tips is prone to produce axial extension; increase in the change rate of velocity is liable to induce radial extension. In addition, the ratio of average stress wave change rate of two cracks is about 2.25, which is consistent with the attenuation ratio of stress waves in different explode packages.

Key words

slope excavation blasting / detonation wave / explosive gas / crack propagation / stress / velocity / time history curves

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LIANG Rui, WANG Shu-jiang, ZHOU Wen-hai, HUANG Xiao-bin, XIONG Zheng-yu, WANG Jian-yong. Crack Propagation Caused by Slope Excavation Blasting Based on Stress and Velocity Time History Analysis[J]. Journal of Changjiang River Scientific Research Institute. 2019, 36(12): 71-77 https://doi.org/10.11988/ckyyb.20180614

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