Particle discrete element method based analysis of stability of roadway surrounding joint rock mass

doi:10.16265/j.cnki.issn1003-3033.2017.04.024

Abstract

Abstract: Joint rock mass has discontinuity and large deformation characteristics.For the sake of studing the stability of a given roadway surrounding joint rock mass,a model was built for the roadway in a joint rock mass by using the particle discrete element method.The effect of connection rate of joint on deformation and failure of the rock mass was studied. The displacement of surrounding rock as well as the distribution of micro cracks were analyzed. The results show that the deformation of the rock mass under an external load is a function of the connection rate of joints,so when the rate is zero the deformation is small, when the rate reaches 50% local falling occurs, when the rate is 70%,rock of roadway tends to form failure surfaces, gives birth to blocks falling,and deforms seriously, and that with the increase of joint connectivity rate, surrounding rock micro cracks increase sharply, main cracks in surrounding rock are shear cracks,the most possible way of failure for the joint rock of roadway is shear failure.

Key words: joint rock mass, particle flow code, roadway, connection rate of joints, deformation and failures

CLC Number:

X936

LI Chuanming, LIU Wanrong. Particle discrete element method based analysis of stability of roadway surrounding joint rock mass[J]. China Safety Science Journal, 2017, 27(4): 133-138.

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