考虑中间主应力的非均匀应力场圆形巷道围岩塑性区分析

doi:10.11799/ce201403022

Abstract

Abstract:

With the use of Drucker-Prager principle, derive the plastic zone boundary line equation of the roadway, and predict the size and shape of the plastic zone of surrounding rock on different pressure coefficient; The introduction of the intermediate principal stress coefficient, using univariate analysis, projections the variation of the radius of the plastic zone of surrounding rock stand-by different intermediate principal stress. when we calculate the Lateral pressure coefficient, draw a compare between the dimension of roadway plasticity with the principle of D-P and M-C. More distance from 1 of Lateral pressure coefficient , more error between lateral stress and vertical stress of roadway plasticity ,and more influence to the dimension and direction of roadway. With the growth of middle Principal stress, the sphere of plasticity decrease. As a result, paying proper consideration will enhance the safety of engineer practise and more economic benefit in the days to come.

Key words: Non-uniform stress field, Circular roadway, Surrounding rock mass plastic zone, Side pressure coefficient, Intermediate principal stress

CLC Number:

TD322

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http://www.coale.com.cn/EN/Y2014/V46/I3/68

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Plastic zone analysis of surrounding rock in circular roadway under non-uniform stress field with considering intermediate principal stress

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