岩体锚固效应及锚杆的解析本构模型研究

利用Mohr-Coulomb、Hoek-Brown以及Duncan-Chang理论分别分析了块状和碎块状岩体锚固后的物理效应，通过分析认为，岩体锚固后可以有效地提高岩体的凝聚力和软弱结构面的抗剪强度，增强岩体的弹性模量，改善岩体的力学性质。通过对拉拔试验测试结果分析，在一定的假设条件下，推导了锚杆与注浆体或岩体耦合情况下的解析本构方程，并对其进行了参数分析，认为提高拉拔力、增大锚杆直径和锚固段长度可以有效地改善其锚固效果，并提出了锚固临界值的概念。在前人工作的基础上，利用提出的耦合解析本构模型建立了非耦合状态下锚杆的解析本构模型，通过计算认为，该解析模型是合理的。

Study of reinforcement effect of anchored rock masses and analytic constitutive equation for rock bolt

Based on the theories of Mohr-Coulomb and Hoek-Brown and Duncan-Chang, the anchored effect of some kinds of rock masses are analysed; and the results of that the cohesive strength of rock masses and the shear strength of the rock joints have been improved by bolts or cables are established. . Through analyzing the tests results, the development of analytical constitutive equations based on the thesis of shear stress is in proportion to bolt or rock mass relative displacement are established; and the analysis of parameters are carried out; it is shown that the reinforcement effect may be improved and enhanced by increase the magnitude of applied load and the diameter of bolt or cable and anchored length. Under previous researchers’ studying works, the development of the analytic model which the interface decoupling between bolt and grout medium or rock masses has been established based on above-mentioned analytical constitutive equation.