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| Numerical Study on Mechanism of Zonal Disintegration in Deep Rock Mass with Joints |
| MAO Ke-ming, SU Yong-hua, ZHENG Xuan |
| College of Civil Engineering, Hunan University, Changsha Hunan 410082, China |
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Abstract Based on this reality that surrounding rocks of deep undergrounds engineering repeatedly bear geological force and excavation disturbance, the integrity and mechanical properties were weakened, it is thought that the stress-strain relation submits to the post-peak softening joint model, and then considering other parameters, such as joints, initial geostress, strength, and deformation that affecting the rock mass property. A simulation scheme is designed, and the FLAC3D numerical software is used to reproduce the process of zonal disintegration. The simulation results show that (1) The existence and distribution of joints have a great impact on the form and scale of zonal disintegration in jointed rock, and the relative relation between rock mass strength and initial geostress is the key to zonal disintegration; (2) Zonal disintegration will emerge when the initial geostress exceeds the rock uniaxial compressive strength; (3) Initial geostress is approximately proportional to rock mass strength, increase in Poisson's ratio, amount of zonal disintegration, extended length, and range of rupture zone, contrary to the trend displayed by the friction angle. The results partly reveal the mechanical mechanism of zonal disintegration and provide a beneficial reference for the establishment of supporting design theory in deep surrounding rock.
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Received: 24 March 2013
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| Fund:Supported by the National Natural Science Foundation of China (No.51078136);and the State Key Laboratory for Geomechanics and Deep Underground Engineering (No.SKLGDUEK0915) |
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Corresponding Authors:
MAO Ke-ming, k.m.mao@hotmail.com
E-mail: k.m.mao@hotmail.com
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2013, Vol. 7 
