›› 2014, Vol. 35 ›› Issue (6): 1555-1560.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Disturbance mechanism of blasting excavation to aquiferous rock crack propagation

CHEN Ming1, 2, LU Wen-bo1, 2, YAN Peng1, 2, HU Ying-guo1, 2, ZHOU Chuang-bing1, 2   

  1. 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, China
  • Received:2013-03-06 Online:2014-06-10 Published:2014-06-20

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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.

Key words: blasting excavation, rock mass, crack propagation, disturbance

CLC Number: 

  • O 383.1
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