考虑基础刚度的新型高填方双层衬砌式明洞的动态力学特性
发布时间：2018-08-19 12:27
【摘要】：为解决高填方明洞整体式衬砌过厚导致的水化热裂缝问题,在渝利铁路重庆丰都高填方明洞工程中首次采用双层衬砌设计,通过现场实测及数值模拟2种方法分析该新型结构的动态力学特性。结果表明:在回填土达到明洞顶部前,即仅有侧向荷载时,明洞结构的内力增量很小,在回填高度超过明洞顶部后,明洞的内力则随回填高度的增加而线性增长;双层衬砌明洞的外衬和内衬的轴力之比接近二者的厚度之比,而二者的弯矩之比则无类似规律,二者的相互作用方式与组合梁类似;采用混凝土坝基础时一定程度上增大明洞的荷载,其上明洞的轴力和弯矩分别为软岩基础上明洞的1.2~1.6倍和1.6~2.4倍;明洞拉应力集中现象主要出现在边墙位置。建议对混凝土坝基础上的明洞采取减载和优化边墙结构措施。
[Abstract]:In order to solve the problem of hydration thermal crack caused by the overthick lining of the high-fill Ming Cave, the double-layer lining design was adopted for the first time in Chongqing Fengdu High-fill Ming Cave Project of Yu-Li Railway. The dynamic mechanical properties of the new structure are analyzed by field measurement and numerical simulation. The results show that when the backfill reaches the top of the open hole, that is, only lateral load, the increment of the internal force of the open tunnel structure is very small, and when the backfill height exceeds the top of the open hole, the internal force of the open tunnel increases linearly with the increase of the backfill height. The axial force ratio of double lining and inner lining is close to the ratio of thickness of the two, but the ratio of bending moment of the two has no similar law, and the interaction between them is similar to that of composite beam. When the concrete dam foundation is adopted, the load of the open tunnel is increased to a certain extent, and the axial force and bending moment of the upper open tunnel are 1.20.16 times and 1.62.4times of that of the open tunnel on the soft rock foundation, respectively, and the tensile stress concentration phenomenon of the open tunnel mainly appears in the side wall position. It is suggested that measures should be taken to reduce load and optimize the side wall structure for the open hole on the foundation of concrete dam.
【作者单位】： 西南交通大学土木工程学院;西南交通大学交通隧道工程教育部重点实验室;
【基金】：中国铁路总公司科技研究开发计划项目(2014G010) 重庆市应用开发计划重点项目(cstc2014yykfB30003)
【分类号】：U451
[Abstract]:In order to solve the problem of hydration thermal crack caused by the overthick lining of the high-fill Ming Cave, the double-layer lining design was adopted for the first time in Chongqing Fengdu High-fill Ming Cave Project of Yu-Li Railway. The dynamic mechanical properties of the new structure are analyzed by field measurement and numerical simulation. The results show that when the backfill reaches the top of the open hole, that is, only lateral load, the increment of the internal force of the open tunnel structure is very small, and when the backfill height exceeds the top of the open hole, the internal force of the open tunnel increases linearly with the increase of the backfill height. The axial force ratio of double lining and inner lining is close to the ratio of thickness of the two, but the ratio of bending moment of the two has no similar law, and the interaction between them is similar to that of composite beam. When the concrete dam foundation is adopted, the load of the open tunnel is increased to a certain extent, and the axial force and bending moment of the upper open tunnel are 1.20.16 times and 1.62.4times of that of the open tunnel on the soft rock foundation, respectively, and the tensile stress concentration phenomenon of the open tunnel mainly appears in the side wall position. It is suggested that measures should be taken to reduce load and optimize the side wall structure for the open hole on the foundation of concrete dam.
【作者单位】： 西南交通大学土木工程学院;西南交通大学交通隧道工程教育部重点实验室;
【基金】：中国铁路总公司科技研究开发计划项目(2014G010) 重庆市应用开发计划重点项目(cstc2014yykfB30003)
【分类号】：U451
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