路肩式擋土墙论文既有铁路路基支挡震后评估及修复技术研究.docVIP

路肩式挡土墙论文：既有铁路路基支挡震后评估及修复技术研究 【中文摘要】5.12汶川特大地震发生在高山峡谷地区,地震及其引发的山体滑坡、崩塌、危岩落石等地质灾害,对既有铁路路基、挡防工程的破坏巨大,边坡和路基坍塌、滑动、开裂,影响运输安全畅通,造成巨大经济损失。既有铁路路基支挡震后评估及修复技术国内外已有一定的的研究成果,并成功应用于震后路基支挡的加固与修复中,日本在此领域处于领先地位。但是综观所收集到的资料,发现缺乏系统的研究,特别是对地震后支挡结构的加固补强技术缺乏系统的研究。另一方面,汶川特大地震是近一百年来世界上最大的板内地震,因此汶川特大地震对既有线的破坏程度是任何地震都无法比拟的,因此可以说,许多既有线的加固补强技术不适合或需要改进后才适合应用到对汶川特大地震引起的既有线路基支挡结构的破坏。本文结合《既有铁路路基支挡震后评估及修复技术研究》科研项目,对地震力作用下的路肩式挡土墙和路堤式挡土墙进行研究。本文对汶川地震导致的既有铁路路基病害进行分类,对破坏机理进行分析,提出加固与修复措施。分别以路肩式挡土墙和路堤式挡土墙为研究对象,研究加桩这种加固补强技术的可靠性和效果。利用FLAC3D软件建立挡土墙的三维模型,采用E1Centro地震波作为地震输入信号,分析了路肩式挡土墙和路堤式挡土墙在地震加速度作用下,加固前的墙背水平位移、墙背土压力和稳定系数；加固后的墙背水平位移,锚固段桩身弯矩。得出了加固前后不同地震力作用下挡土墙的受力和变形分布规律。研究表明：在6种地震加速度作用下,路肩式挡土墙和路堤式挡土墙都会失稳破坏,不能满足抗震设计要求,须进行加固处理。挡土墙前面加桩这种加固补强技术可以有效的改善挡土墙的受力和变形情况,提高了挡土墙结构的稳定性。 【英文摘要】5.12 Wenchuan earthquake occurred in the alpine and gorge region, earthquake and triggered landslides, avalanches, falling and dangerous rocks and other geological disasters, have a huge destructive effect on the existing railway subgrade and retaining engineering. Collapse, sliding and cracking of side slope and subgrade influence transportation safety and cause huge economic losses.The post-earthquake assessment and renovation technology research of railway subgrade retaining structure have been certain research achievements home and abroad, and successfully used in it. Japan has a leading position in this field. But acrossed the collected data, it is found that methods also lack of systematic research,, especially on the post-earthquake reinforcement techniques of retaining structure. On the other hand, the Wenchuan earthquake is nearly the world’s largest intraplate earthquake in the century, and the damage to the existing line caused by Wenchuan earthquake is unmatched by any earthquake. So many reinforcement techniques of the existing line are not suitable for it only if it is improved. This article unifies the research project of “the post-earthquake assessment and renovation technology research of railway subgrade retaining s