论文部分内容阅读
对具有时效特性的流变岩体,施工过程对围岩力学响应有显著影响。针对黏弹性时效岩体中深埋圆形隧洞的断面及纵向开挖、锚喷和衬砌施工,用圆柱型正交各向异性弹性体模拟锚固后岩体,建立材料特性变化后锚固区力学响应的计算方法,进而导出Burgers岩体全施工过程的封闭解析解。根据解答分析了锚固区各向异性程度、锚固及衬砌支护时刻、锚固厚度对锚固区应力、位移的影响。分析表明:锚固区环向刚度的改变可显著影响岩体力学响应,而改变径向刚度则变化极小;衬砌受力与其施加时刻相关,而受锚固时刻影响不大;增加锚固区厚度可减小位移,优化锚固区受力,但对衬砌的受力影响很小。本解答可进行相似条件下隧洞初步设计。
For rheological rock with aging characteristics, the construction process has a significant effect on the mechanical response of the surrounding rock. Aiming at the cross-section and longitudinal excavation, anchor spray and lining construction of deep-buried circular tunnel in viscoelastic age rock, the anchorage-bearing rock mass is simulated by cylindrical orthogonal anisotropy elastic body, and the mechanical response of anchorage zone is established after the change of material property , And then the closed analytic solution of the complete construction of Burgers rock mass is deduced. Based on the solution, the influence of anchorage zone anisotropy, anchor and lining support moment and anchorage thickness on the stress and displacement of anchorage zone are analyzed. The analysis shows that the change of the circumferential stiffness of the anchorage zone can significantly affect the mechanical response of the rock mass, while the change of the radial stiffness has little change. The lining stress is related to the moment of application and is not affected by the anchorage moment. The thickness of the anchorage zone can be reduced Small displacement, to optimize the anchorage zone stress, but little impact on the lining force. This solution allows for preliminary design of tunnels under similar conditions.