基于安全度的黄土隧道结构承载性能分析
发布时间：2018-12-25 21:19
【摘要】：基于八仙峁隧道、麻塌隧道2组典型断面二衬混凝土应变监测数据,分析了二衬混凝土在黄土隧道中应变随时间的变化规律;通过换算得到二衬结构所受应力,将换算结果代入安全度应力表达式,得出该断面下黄土隧道二衬安全度分布,并与有限元数值模拟结果进行对比。结果表明:在黄土隧道的支护结构中,二衬混凝土结构不仅作为安全储备,而且往往需要承受大部分荷载,通过数值模拟确定二衬承受的荷载约为围岩荷载的40%;二衬混凝土结构作为受压构件,其最大应变出现在边墙底部位置;数值模拟与计算所得二衬安全度分布规律基本一致,拱顶、拱肩、边墙底部仰拱部位安全度相对较小但满足规范要求,仰拱底部所受压应力最大且安全度未满足规范要求。
[Abstract]:Based on the strain monitoring data of two typical sections of Baxanmao tunnel and Maituo tunnel, the variation of strain of concrete with time in loess tunnel is analyzed. The stress of the two-liner structure is obtained by conversion, and the result of conversion is replaced by the expression of the safety degree, and the distribution of the second-lining safety degree of the loess tunnel under the section is obtained, and the results are compared with the results of finite element numerical simulation. The results show that in the supporting structure of loess tunnel, the concrete lining structure not only serves as a safe reserve, but also needs to bear most of the load. The numerical simulation shows that the load bearing the second lining is about 40 percent of the surrounding rock load. As a compression member, the maximum strain of two-lining concrete structure appears at the bottom of the sidewall. The result of numerical simulation is consistent with that of calculation. The safety degree of arch roof, arch shoulder and the bottom of side wall is relatively small but meets the requirements of code, and the pressure stress at the bottom of inverted arch is the largest and the safety degree does not meet the requirements of the specification.
【作者单位】： 长安大学陕西省公路桥梁与隧道重点实验室;西安建筑科技大学理学院;
【基金】：陕西省自然科学基础研究计划项目(2014JM7245) 陕西省工业科技攻关计划项目(2015GY185) 交通运输部西部交通建设科技项目(2007 318 000 18)
【分类号】：U451
[Abstract]:Based on the strain monitoring data of two typical sections of Baxanmao tunnel and Maituo tunnel, the variation of strain of concrete with time in loess tunnel is analyzed. The stress of the two-liner structure is obtained by conversion, and the result of conversion is replaced by the expression of the safety degree, and the distribution of the second-lining safety degree of the loess tunnel under the section is obtained, and the results are compared with the results of finite element numerical simulation. The results show that in the supporting structure of loess tunnel, the concrete lining structure not only serves as a safe reserve, but also needs to bear most of the load. The numerical simulation shows that the load bearing the second lining is about 40 percent of the surrounding rock load. As a compression member, the maximum strain of two-lining concrete structure appears at the bottom of the sidewall. The result of numerical simulation is consistent with that of calculation. The safety degree of arch roof, arch shoulder and the bottom of side wall is relatively small but meets the requirements of code, and the pressure stress at the bottom of inverted arch is the largest and the safety degree does not meet the requirements of the specification.
【作者单位】： 长安大学陕西省公路桥梁与隧道重点实验室;西安建筑科技大学理学院;
【基金】：陕西省自然科学基础研究计划项目(2014JM7245) 陕西省工业科技攻关计划项目(2015GY185) 交通运输部西部交通建设科技项目(2007 318 000 18)
【分类号】：U451
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