考虑岩体时效深埋隧洞施工过程的理论解析——开挖、锚喷与衬砌支护的全过程模拟与解答

发布时间：2018-02-25 22:01

本文关键词： 时效锚喷支护解析解　出处：《岩土工程学报》2014年07期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:For rheological rock mass with aging characteristics, the construction process has a significant effect on the mechanical response of surrounding rock mass. In view of section and longitudinal excavation of deep buried circular tunnel in viscoelastic aged rock mass, anchoring and shotcreting and lining construction, The rock mass after anchoring is simulated with cylindrical orthotropic elastomer, and the method of calculating the mechanical response of anchoring zone after the change of material characteristics is established. Then the closed analytical solution of the whole construction process of Burgers rock mass is derived. According to the solution, the anisotropy degree of the Anchorage zone, the time of Anchorage and lining support, the stress of Anchorage zone caused by the Anchorage thickness are analyzed. The analysis shows that the change of circular stiffness in anchoring zone can significantly affect the mechanical response of rock mass, while the change of radial stiffness is minimal, and the stress of lining is related to the moment of its application, but not affected by the moment of anchoring. Increasing the thickness of Anchorage zone can reduce displacement and optimize the stress of Anchorage zone, but it has little effect on the stress of lining. This solution can be used for the preliminary design of tunnel under similar conditions.
【作者单位】：同济大学航空航天与力学学院;同济大学土木工程学院地下建筑与工程系;
【基金】：国家重点基础研究发展计划(973计划)(2014CB046901) 上海市自然科学基金项目(11ZR1438700) 国家杰出青年基金项目(51025932)
【分类号】：U452

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