Distribution characteristics of the rock mass damage caused by single-hole decoupling charge blasting

被引：0
|
作者：
Pan Q. [1 ]
Zhang J. [1 ]
Shi H. [2 ]
Zou X. [3 ]
Deng X. [4 ]
Xu H. [1 ]
机构：
[1] Institute of Civil Engineering, Southwest Jiaotong University, Chengdu
[2] Department of Architectural and Environmental Engineering, Chengdu Technological University, Chengdu
[3] Zigong City Construction Investment Development Group Co., Ltd., Zigong
[4] China Tiesiju Civil Engineering Group Co., Ltd., Hefei
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2019年 / 38卷 / 18期
关键词：
Damage distribution characteristic; Decoupling charge; Effective elastic modulus; Explosive stress wave; Quasi-static gas; Single-hole blasting;
D O I：
10.13465/j.cnki.jvs.2019.18.037
中图分类号：
学科分类号：
摘要：
The distribution characteristics of the rock mass damage under excavation blasting is a basis for the surrounding rock reinforcement in underground engineering and slope protection design. Defining the elastic modulus as a damage factor, the damage area caused by decoupling charge blasting was partitioned and its characteristics were described. With the application of the calculation method for the effective elastic modulus put forward by Taylor, the corresponding formulas of damage distribution characteristics under single-hole blasting were derived according to the attenuation law of explosive stress wave and the theory of thick-walled cylinder respectively, which were then superimposed to obtain a formula of damage distribution characteristics under the combined action of explosive stress wave and quasi-static gas. Damage tests data were cited to analyze the feasibility and accuracy of the method proposed. The results show that the theoretical formula, whose results correlates well with the test data and are of higher accuracy, can represent the distribution characteristics of blasting damage and estimate the damage scope. Damage factors of decoupling charge blasting are of exponential attenuation and its attenuation rate decreases gradually when K≥K0 and first increases and then decreases when K<K0, meanwhile, the attenuation rate increases with the increase of decoupling coefficient. Under the same other conditions, the damage scope decreases with the increase of decoupling coefficient. From the perspective of damage, it is necessary to apply appropriate decoupling coefficients to the smooth blasting or pre-splitting blasting charge structure. © 2019, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：264 / 269
页数：5
相关论文
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