(1. State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan，Hubei 430072，China；2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education，Wuhan University，Wuhan，Hubei 430072，China)
Abstract：Aiming at the drilling and blasting excavation method for rock，the explosive stress wave variation with time and space as well as the influence of which on the rock cracking process are analyzed with stress intensity factor. Results show that under the action of explosive stress wave，the stress in the rock media will be in compression-shear or tensile-shear state with time order. In the field near blast hole，the rock cracking is controlled by the compression-shear stress state；while the tensile-shear stress state plays a major role in rock cracking when it is far from the blast hole；with the increasing of distance，rock cracking is mainly controlled by tensile-shear stress state，which is primarily composed of a combination of radial tensile stress and tangential tensile stress. The influence of tensile shear stress state on the cracking zone cannot be ignored especially for low-strength rock.
杨小林，王梦恕. 爆生气体作用下岩石裂纹的扩展机理[J]. 爆炸与冲击，2001，21(2)：111-116.(YANG Xiaolin，WANG Mengshu. Mechanism of rock crack growth under detonation gas loading[J]. Explosion and Shock Waves，2001，21(2)：111-116.(in Chinese))
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2014, Vol. 33 
