论文部分内容阅读
层状岩体是地下工程中经常遇到的一种岩体,力学性质具有明显的各向异性。选择合适的屈服准则和强度参数变化规律,结合各向异性弹性本构方程,获得横观各向同性弹塑性本构关系,利用该本构模型对共和隧道锚杆支护方案进行数值计算。首先考虑地应力、岩性的影响,从围岩的变形、破坏形式、塑性区及锚杆拉力的大小等方面改进、优化支护设计方案;其次从实际工程出发,考虑施工难度、工程造价等因素的影响,得到改进方案Ⅰ效果较理想,通过试验段现场监测确定改进方案I。本构模型对计算结果的影响很大,正确模型的计算结果可以为实际工程提供科学依据。
Layered rock mass is a kind of rock mass often encountered in underground engineering, and its mechanical properties have obvious anisotropy. By choosing suitable yield criterion and the variation law of strength parameters, combined with the anisotropic elastic constitutive equation, the transverse isotropic elastic-plastic constitutive equation is obtained. The constitutive model is used to calculate the bolt supporting scheme in Gonghe tunnel. First of all, considering the influence of geostress and lithology, the design of support is optimized from the aspects of deformation, failure mode, plastic zone and the pulling force of rock bolt. Second, from the actual project, considering the construction difficulty, project cost and so on Factors, the improved program Ⅰ effect is better, through the test section of the scene to determine the improvement program I. The constitutive model has a great influence on the calculation results, and the calculation results of the correct model can provide a scientific basis for the actual project.