顺层路堑边坡开挖预支护设计方法

发布时间：2018-04-09 07:03

本文选题：顺层路堑边坡　切入点：稳定性分析　出处：《武汉理工大学》2015年硕士论文

【摘要】：在公路、铁路等道路工程建设中,由于切坡修路的缘故,已经不可避免地产生了大量的路堑边坡,而有关路堑边坡失稳事故时有发生,尤其是高路堑边坡开挖施工过程中。根据我国《公路路基设计规范》JTG D30-2004的要求,对超过20米的土质路堑边坡和30米的岩质路堑边坡需要进行单独设计,但具体要求并不明确。实际工程中,边坡开挖及支护参数设计多以最终成形边坡稳定验算为准进行设计,开挖过程边坡稳定性考虑欠缺,从而导致施工过程中经常发生失稳事故,而路堑边坡中顺层路堑边坡的稳定性最差,也因此,顺层路堑边坡在开挖过程中失稳最为常见。为此,本文以顺层高路堑边坡为工程对象,针对顺层高路堑边坡开挖过程失稳风险控制,对顺层高路堑边坡开挖预支护技术进行系统研究。本论文研究内容主要包括以下4个方面:(1)针对顺层路堑边坡开挖预支护判别,提出了一种新的顺层路堑边坡的分类方法。基于现有顺层路堑边坡分类方法,考虑顺层路堑边坡一般开挖方式,系统总结顺层路堑边坡失稳模式,提出一种新的顺层路堑边坡的分类,为其进行定性预支护判别提供基础。(2)针对顺层路堑边坡开挖破坏模式,结合目前常用边坡支护措施,考虑开挖方式的变化,系统分析并总结了不同顺层路堑边坡类型适宜的预支护措施。(3)提出了顺层路堑边坡是否需要预支护的判别方法及预支护设计流程,为此类边坡设计提供指导。(4)结合渝怀铁路某顺层路堑边坡,运用本文方法对此进行了预支护判别分析,提出了预支护方案,并运用UDEC数值模拟软件比较分析了其在开挖过程中采用和不采用预支护技术的安全性,说明了预支护措施的有效性;同时结合普宣高速公路某顺层路堑边坡开挖过程破坏案例分析,说明了预支护措施的必要性。
[Abstract]:In the construction of highway, railway and other road projects, a large number of cutting slopes have been inevitably produced due to the cutting slope construction, and the accidents of slope instability have occurred frequently, especially in the excavation process of high cutting slope.According to the requirement of JTG D30-2004, more than 20 meters of soil cut slope and 30 meters of rock cut slope need to be designed separately, but the specific requirements are not clear.In actual engineering, the design of slope excavation and support parameters is usually based on the stability check calculation of the final formed slope, and the slope stability is not considered in the excavation process, which leads to frequent unstable accidents in the construction process.The stability of the bedding cutting slope is the worst in the cutting slope, therefore, the instability of the bedding cutting slope is the most common in the excavation process.For this reason, this paper takes the bedding high cutting slope as the engineering object, aiming at the risk control of instability during the excavation process of the bedding high cutting slope, and carries on the systematic research on the pre-support technology for the excavation of the bedding high cutting slope.This paper mainly includes the following four aspects: (1) A new classification method of bedding cutting slope is put forward according to the discrimination of pre-support in excavation of bedding cutting slope.Based on the existing classification methods of bedding cutting slope and considering the general excavation mode of the bedding cutting slope, this paper systematically summarizes the instability mode of the bedding cutting slope, and puts forward a new classification of the bedding cutting slope.In view of the excavation failure mode of bedding cutting slope, considering the change of excavation mode, combined with the commonly used slope support measures at present,This paper systematically analyzes and summarizes the suitable pre-supporting measures for different types of bedding cutting slope. It puts forward the discriminant method and design flow of pre-supporting for bedding cutting slope.To provide guidance for the design of this kind of slope, combined with a cutting slope of Yu-huai railway, this paper uses the method of this paper to carry out the discriminant analysis of pre-support, and puts forward the pre-support scheme.The UDEC numerical simulation software is used to compare and analyze the safety of the pre-support technology in the excavation process, which shows the effectiveness of the pre-support measures.At the same time, combined with the analysis of the damage case of a bedding cutting slope excavation in Puxuan Expressway, the necessity of pre-supporting measures is explained.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1;U213.1

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