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Mechanism and Dynamic Photo-elasticity Experiment of Cutting Seam Cartridge Blasting of Protecting Borehole Wall with Pipe

Pu Chuanjin,Guo Xuebin,Xiao Zhengxue,Zhang Zhicheng(School of Environment and Resource,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China)  
The process and mechanical behavior of cutting seam cartridge blasting of protecting borehole wall with pipe(CSBPBWP) are analyzed in theory.Dynamic photo-elasticity experiment for CSBPBWP was carried out,and the isochromatic fringe patterns of CSBPBWP were obtained.The analysis of the isochromatic fringe patterns shows that in the process of CSBPBWP,the effect of explosive products firstly acts on borehole wall in the direction of cutting seam,and then acts on it in the direction of free face,eventually acts on it in the direction of protected face,and this effect is more and more weak.The shock effect of explosive products in the direction of protected face can be greatly reduced due to pipe protecting borehole wall.The shear stress difference between free face and protected face reaches 1.75 times,and it is the important power to create smooth crack face of blasting and break the medium in the direction of free face.The theoretic analysis and experimental results show that CSBPBWP can utilize adequately explosion energy,so CSBPBWP technology has good prospect of applications.
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