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 structure “, makes a research on road shoulder and embankment retaining wall under seismic force effect.This article classifies the diseases caused by Wenchuan earthquake of existing railway subgrade, analyzes the damage mechanism, and proposes reinforcement and restoration measures. Reliability and effect of reinforcement as adding piles are studied with the road shoulder and embankment retaining wall as the research objects respectively. This article uses FLAC3D to build three-dimensional model of retaining walls, inputs El Centro earthquake seismic waves as earthquake signals, analyzes the horizontal displacement, earth pressure and stable coefficient on the back of retaining wall before reinforcement, horizontal displacement on the back of retaining wall and pile body moment on anchorage section after reinforcement under the seismic acceleration, and obtains retaining wall’s forcing and deformation distribution before and after reinforcement under different seismic forces.The results show that road shoulder and embankment retaining wall
will lose steady or failure under 6 different seismic acceleration. So it can not meet the seismic design requirements and need reinforcement. Adding piles before retaining wall can effectively improve the force and deformation of retaining wall, and enhance the stability of retaining wall.
【关键词】路肩式挡土墙 路堤式挡土墙 动力分析 地震 【英文关键词】shoulder retaining wall embankment retaining wall dynamic analysis earthquake 【目录】既有铁路路基支挡震后评估及修复技术研究6-712-1313-14
Abstract7
第1章 绪论
13
12-15
摘要
1.1 引言
1.2 选题背景和意义1.3 国内外研究现状
1.4.1
1.4 论文主要研究内容与技术路线14-15
1.4.2 技术路线14-15
研究内容14第2章 既有铁路
2.2 既有
路基震后评估及修复技术15-26铁路震后路基病害15-2123-2423-2424
15-23
2.1 概述15
2.2.1 主体工程结构破坏
2.3 破坏机理分析2.3.2 外因方面2.4.1 加固与修复原则第3章 有限差分法26
3.2 本构模型3.2.2 弹性模型
2.2.2 次生地质灾害21-232.3.1 内因方面2.4 加固与修复
24-26
23
2.4.2 加固与修复措施24-26
26-31
3.1 概述
26
动力分析理论基础26-27
3.2.1 摩尔-库伦模型
26-27法2727-2828论
29
3.3 FLAC3D动力分析计算方法273.3.2 FLAC3D非线性方法273.4.1 静态边界3.5 接触面28-30
27-28
3.3.1 等线性3.4 FLAC边界条件
3.4.2 自由场边界
3.5.1 FLAC3D中接触面的基本理
3.5.2 FLAC3D中接触面几何模型的建立3.6 FLAC3D动荷载的输入及阻尼的选择3.6.1 FLAC3D地震荷载的输入3030-31
3.6.2 FLAC3D
29-3030-31阻尼的选择31-56
第4章 路肩式挡土墙的地震分析
4.2 路肩式挡土墙的
4.2.1.1 几何
4.1 挡土墙的分类31-32
数值分析32-454.2.1 模型建立32-36
模型和接触面的建立32-3434-35
4.2.1.2 计算模型及参数的选择
4.2.2 路肩式挡
4.2.1.3 模型动态分析35-36
36-45
土墙地震响应结果与分析36-38
4.2.2.1 墙背水平位移
4.2.2.3 倾覆稳定
4.2.2.2 墙背土压力38-43
系数K_o与滑动稳定系数K_c43-45的数值分析45-54
4.3 加固后路肩式挡土墙
4.3.2 加固4.3.2.1 加固后
4.3.1 模型建立45-46
后路肩式挡土墙地震响应结果与分析46-54墙背水平位移53-54析
56-91
56
46-53
4.3.2.2 锚固段桩身弯矩第5章 路堤式挡土墙的地震分
56-73
5.1.1
4.4 小结54-56
5.1 路堤式挡土墙的数值分析
模型建立56-73
5.1.2 路堤式挡土墙地震响应结果与分析
56-60
5.1.2.2 墙背土
5.1.2.1 墙背水平位移
压力60-705.1.2.3 倾覆稳定系数K_o与滑动稳定系数5.2 加固后路堤式挡土墙的数值分析5.2.1 模型建立
73-75
5.2.2 加固后路堤式挡5.2.2.1 加固后墙背水平位
86-92-93
5.3 小结
致谢攻读硕士学工
作
K_c70-7373-
土墙地震响应结果与分析75-移
75-86
5.2.2.2 锚固段桩身弯矩结论
91-92
展望
-9193-94位104
期
参考文献94-98间
主
要
附录98-104
科
研
