Disturbance mechanism of blasting excavation to aquiferous rock crack propagation

CHEN Ming; LU Wen-bo; YAN Peng; HU Ying-guo; ZHOU Chuang-bing

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Disturbance mechanism of blasting excavation to aquiferous rock crack propagation

更新时间：2026-06-25

- Disturbance mechanism of blasting excavation to aquiferous rock crack propagation
- Vol. 35, Issue 6, (2014)
- 作者机构：
  
  1. 武汉大学水资源与水电工程科学国家重点试验室,武汉,430072
  2. 武汉大学水工岩石力学教育部重点试验室,武汉,430072
- 作者简介：
- 基金信息：
- DOI：
  CLC： O383.1
- Online First：20 June 2014，
  
  Published：2014
- 稿件说明：
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CHEN Ming, LU Wen-bo, YAN Peng, et al. Disturbance mechanism of blasting excavation to aquiferous rock crack propagation[J]. 2014, 35(6).
DOI：

CHEN Ming, LU Wen-bo, YAN Peng, et al. Disturbance mechanism of blasting excavation to aquiferous rock crack propagation[J]. 2014, 35(6). DOI：

摘要

岩体裂纹的水力劈裂是岩体开裂渗漏甚至施工涌水的重要影响因素之一，也是岩土工程界的研究热点。从断裂力学角度分析了爆破开挖对岩体含水裂纹扩展的扰动作用，结果表明，爆破开挖扰动下，岩体含水裂纹的扩展，与爆炸应力波强度及其入射角、地应力的大小与方向、孔隙水压大小、裂纹的倾角及断裂韧度等因素相关；爆炸应力波的作用，相当于增大了岩体裂纹中的孔隙水压力，每1 cm/s的峰值振动速度相当于增大100 kPa的孔隙水压力，爆破振动速度越大，所产生的爆破扰动荷载越大；岩体开挖引起的岩体裂纹近区地应力及其孔隙水压力的变化，对裂纹的失稳与扩展具有较复杂的影响，可改变裂纹的失稳扩展模式。

Abstract

The hydraulic fracturing of rock mass cracking is one of the important influencing factors that causes rock mass cracking and leakage and even construction water gushing

which is also the research hotspot in geotechnical engineering field. The disturbance effect on crack propagation of aquiferous rock cracking by blasting excavation is analyzed based on fracture mechanics; and the results show that

under disturbance of blasting excavation

the cracking propagation of aquiferous rock relates to the strength and incident angle of blasting stress wave

the value and direction of ground stress

the value of pore water pressure

the crack dip

and the fracture toughness

etc. The effect of blasting stress wave equals to increasing the pore water pressure inside rock mass cracks

which means per 1 cm/s peak particle vibration velocity equals to increasing 0.1 MPa pore water pressure; and the larger the blasting vibration velocity is

the greater the blasting disturbance load will be. The change of ground stress and pore water pressure caused by rock mass excavation around rock mass cracks have complex influence on instability and propagation of cracks

which may change the instability and propagation model of cracks.

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