大理岩裂纹应变演化与模型研究

EVOLUTION CHARACTERISTICS OF CRACK PROPAGATION UNDER DIFFERENT CONFINING PRESSURE UNLOADING RATES

文中以深地下工程开挖为背景,研究了大理岩在不同卸荷速率下的断裂发展速率。结果表明大理岩裂纹应变扩展速率随卸荷速率的增加呈线性增加。并基于岩石轴向裂纹应变,推演出裂纹扩展模型。使用试验值与理论计算值进行对比,能够较好地描述岩石轴向裂纹扩展的非线性过程。为大理岩在不同应力路径下的破坏形态研究提供参考。

In this paper,the fracture development rates of marble under different unloading rates are studied in the deep underground excavation engineering.The results show that the crack strain propagation rate of marble increases linearly with the increase of unloading rate.Furthermore,the crack propagation model is deduced based on the axial crack strain of rock.The nonlinear process of rock axial crack propagation can be described well by comparing the experimental and theoretical values,providing a reference for the study of the failure mode of marble under different stress paths.