运用Hoek-Brown经验准则分析圆形硐室围岩弹塑性应力和位移
ELASTO-PLASTIC ANALYSIS OF STRESSES AND DISPLACEMENTS AROUND A CIRCULAR OPENING USING THE HOEK-BROWN EMPIRICAL CRITERION
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摘要: Hoek-Brown经验准则能够较容易地用来估计节理岩体的强度,在岩石工程界已得到广泛的应用和认可。只要用定量指标合理地描述岩体质量,就可确定岩体的强度,因此Hoek-Brown经验准则为通过岩体质量评分评价岩体稳定性架起了一座桥梁,并对需要采取的加固支护措施提出建议。地下硐室开挖后改变了岩体的初始应力状态,围岩应力产生应力重分布现象。当硐室周边围岩应力状态超过岩体弹性极限状态而进入塑性状态时,塑性区内岩体的应力满足极限平衡条件。本文简单回顾了当侧压力系数为1时,圆形硐室围岩的弹性应力和位移,在此基础上以Hoek-Brown经验准则为极限平衡条件,得到圆形硐室轴对称平面应变问题的围岩弹塑性应力和位移的分析解。Abstract: This paper examines the elastic solution of stress and displacement around a circular opening on the condition that the lateral pressure coefficient equals 1 firstly. The paper further derives the analytic solution of elasto-plastic stress and displacement for the axisymmetric plane strain problem around a circular opening. In the derivation, the Hoek-Brown impirical criterion is used as the limiting equilibrium condition.
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