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

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (18) : 264-269.

PAN Qiang1, ZHANG Jichun1, SHI Hongchao2, ZOU Xinkuan3, DENG Xifei4, XU Hong1

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Abstract

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≥K0 and first increases and then decreases when K＜K0, 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.

Key words

single-hole blasting / damage distribution characteristic / decoupling charge / effective elastic modulus / explosive stress wave / quasi-static gas

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PAN Qiang1, ZHANG Jichun1, SHI Hongchao2, ZOU Xinkuan3, DENG Xifei4, XU Hong1. Distribution characteristics of the rock mass damage caused by single-hole decoupling charge blasting[J]. Journal of Vibration and Shock, 2019, 38(18): 264-269

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