›› 2011, Vol. 32 ›› Issue (9): 2629-2634.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Shock failure mechanism of zonal disintegration within surrounding rock in deep chamber

CHEN Jian-gong1, 2，ZHOU Tao-tao1, 2，ZHANG Yong-xing1, 2   

  1. 1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Key Laboratory of New Technology for Construction of Cities in Mountain Area of Education Ministry, Chongqing University, Chongqing 400045, China
  • Received:2011-03-30 Online:2011-09-10 Published:2011-09-13

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Abstract: The shock failure mechanism of zonal disintegration within surrounding rock in deep chamber is put forward. The transient unloading in surrounding rock creates dynamic action on rock near cavern periphery. In the process of redistribution stress in surrounding rock, the discontinuity plane of the radial stress at wave front existed as the elastic longitudinal wave moves ahead. When the parameters of discontinuity plane satisfy certain condition, a local shock destruction occured. Based on the elastodynamics theory, the dynamic problem can be expressed by displacement potential function; and the general solution of motion equations can be obtained by using Laplace transform. The radial stress field in surrounding rock induced by excavation is obtained. The unified solution of differential pressure at wave front is deduced. The shock constitutive equation and failure criterion on zonal disintegration within rock mass are analyzed based on particle velocity, differential pressure at wave front and conservation of momentum. The crtical value of differential pressure at wave front is obtained as shock failure is generated; and the formula of radius of the fractured zones is got. It shows that there exist the equal ratio relations between the radii and the ratio of equality is .

Key words: rock mechanics, shock failure, deep rock masses, zonal disintegration

CLC Number: 

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