隧洞围岩损伤演化与时效破坏过程的模拟分析

发布时间：2018-05-22 14:53

本文选题：长期强度 + 时效变形　；参考：《地下空间与工程学报》2017年03期

【摘要】：依据对岩石长期强度的认识,基于环境因素影响下岩石强度、弹模等物理力学性质随时间劣化及其内部细观损伤积累等观点,应用RFPA数值模拟方法,模拟了隧洞围岩的时效破坏过程,并与相应的物理模型试验结果进行了对比。隧洞数值模拟试验得到了拱顶、拱底以及两侧帮的时效变形特征曲线,与实际物模试验结果表现出了较好的一致性,并且发现隧洞围岩宏观破坏是细观损伤实时演化及逐步积累的最终表现。进一步模拟分析了侧压系数对隧洞时效变形破坏特性的影响,模拟结果显示,随着侧压系数的增大,隧洞左右边墙间的闭合位移逐渐增大,而隧洞拱顶拱底间的收敛位移随侧压系数的增大逐渐减小,并对隧洞围岩的局部的细观损伤演化过程及宏观时效破坏模式做出了清晰的解释。
[Abstract]:Based on the understanding of the long-term strength of rock, based on the view that the physical and mechanical properties of rock such as strength, modulus of elasticity and other physical and mechanical properties deterioration with time and the accumulation of internal meso-damage under the influence of environmental factors, the RFPA numerical simulation method is applied. The aging failure process of tunnel surrounding rock is simulated and compared with the corresponding physical model test results. The characteristic curves of aging deformation of arch roof, arch bottom and both sides of tunnel are obtained by numerical simulation test of tunnel, which is in good agreement with the result of actual physical model test. It is also found that the macroscopic damage of tunnel surrounding rock is the final manifestation of the real time evolution and gradual accumulation of mesoscopic damage. Furthermore, the influence of lateral pressure coefficient on the aging deformation and failure characteristics of tunnel is analyzed. The simulation results show that with the increase of lateral pressure coefficient, the closing displacement between the left and right side walls of the tunnel increases gradually. However, the convergent displacement between the arch bottom of the arch top of the tunnel gradually decreases with the increase of the lateral pressure coefficient, and the evolution process of the local meso-damage and the macroscopic time-dependent failure mode of the surrounding rock of the tunnel are explained clearly.
【作者单位】：大连理工大学土木工程学院;
【基金】：安徽省科技计划项目(1604a0802109) 国家重点基础研究计划973项目(2014CB047103) 国家自然科学基金资助项目(51279024)
【分类号】：U451.2

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