卸荷条件下的裂隙岩体力学特性研究

Study on Mechanical Properties of Cracked Rockmass under Unloading

岩土工程界绝大多数领域涉及到的是岩土体的卸荷过程,研究裂隙岩体在卸荷条件下的力学特性具有非常重要的理论和现实意义。在线弹性断裂力学理论的基础上,建立了裂隙岩体概化模型,分析了裂隙岩体分别在最小主应力和最大主应力卸荷条件下的应力强度因子和变形特性。研究结果表明,裂隙岩体沿不同应力路径卸荷,其应力强度因子和表现出来的力学特性是不同的,裂隙岩体沿最小主应力卸荷只具有沿最大主应力卸荷条件的某一阶段特性。

Most fields of geotechnical engineering are related to the unloading process of rock and soil. It is of great theoretical and practical significance to study the mechanical properties of cracked rockmass under unloading. Based on the theory of linear elastic fracture mechanics, a generalized model for cracked rockmass was established, The research results show that fractured rockmass is unloaded along different routes, the stress intensity factor is different from the mechanical properties exhibited, and the unloading of fractured rock along the least main stress has only the property of certain stage of the unloading along the greatest main stress.