考虑裂纹内水压的节理岩体蠕变柔量分析

Analysis of creep compliance of jointed rocks with consideration of the influence of water pressure in saturated cracks

利用自洽理论和线粘弹性断裂力学原理推导了考虑张开裂纹、闭合裂纹和裂纹内水压影响的节理岩体体变蠕变柔量和单轴蠕变柔量的理论表达式,并根据该表达式分析了应力荷载、水压、裂隙密度参数、泊松比和摩擦系数改变时裂隙岩体蠕变柔量的变化规律,从而为裂隙岩体工程流变计算提供了一种新的计算方法.

In consideration of the effects of the opening crack, closed crack, and water pressure in cracks, theoretical formulas for the creep compliance of jointed cracks under hydrostatic and uniaxial stress are derived by use of the selfconsistent theory and viscoelastic fracture theory. Then, the formulas are used for analysis of the regularities of creep compliance of jointed cracks varying with stress load, water pressure, crack density, Poission's ratio, and friction coefficients. The present study provides a new method for rheological calculation in cracked rock engineering.