十天高速西略段运营期膨胀土边坡预防性养护技术研究

发布时间：2018-06-29 15:16

本文选题：高速公路 + 膨胀土边坡　；参考：《西安科技大学》2017年硕士论文

【摘要】：十天高速公路西乡-略阳段沿线分布有大量的膨胀土边坡,这些边坡坡体、支挡工程及排水系统在通车运营期间均出现了变形破坏,给边坡养护工作带来了难题,研究沿线膨胀土边坡的病害形成机理和预防性养护技术具有重要意义。文章以十天高速西略区段运营期膨胀土边坡为研究对象,通过资料收集、现场调查、室内试验、现场试验及理论分析等手段,对边坡病害的分布特征、破坏机理及预防性养护技术进行了研究,取得以下研究成果:(1)通过对十天高速西略段沿线膨胀土边坡病害的现场调研,分析得到了该区段的地质概况,沿线边坡坡体、构筑物及排水系统的病害类型、规模、变形破坏特征及分布规律。(2)通过室内试验及理论分析研究得到病害的形成机理。膨胀土边坡土体的蒙脱石含量较高,蒙脱石遇水膨胀,失水收缩,长期干湿循环后,土体裂隙增加抗剪强度减小,在干湿循环反复作用下,坡体出现裂缝、鼓胀、滑移等现象;坡体格构等构筑物在膨胀力的反复作用下,受压区高度减小,中和轴上升,挠度增大,刚度退化,强度降低,当构筑物强度降低到不足以承受膨胀力的时候,出现变形甚至破坏;排水系统病害的形成是养护不到位、设计缺陷和膨胀土特性等共同作用的结果。(3)通过现场试验并结合监测结果在对防治效果评价的基础上,研究提出“斜铺土工格栅”、“楔形结构”、“废旧轮胎”三种膨胀土边坡病害处治方案,得到各技术的施工工艺、工后效果及适用条件。(4)提出坡面防护结构及边坡排水系统两大板块的养护理念,给出各板块主要病害的预防处治措施及相应的预防性养护方案,为后期的养护提供技术指导。论文的研究将增强养护人员对十天高速公路膨胀土边坡在通车运营过程中病害破坏规律的认识,提高养护人员的技术能力,为十天高速公路膨胀土边坡的病害治理提供理论支撑和技术指导,从而降低边坡病害的发生率。
[Abstract]:There are a large number of expansive soil slopes along the Xixiang Lueyang section of the ten day expressway. The slope body, retaining engineering and drainage system all appear deformation and damage during the traffic operation, which brings problems to the maintenance work of the slope. It is of great significance to study the disease formation mechanism and preventive maintenance technology of the expansive soil slope along the highway. In this chapter, by means of data collection, field investigation, indoor test, field test and theoretical analysis, the distribution characteristics of slope disease, failure mechanism and preventive maintenance technology are studied by means of data collection, field investigation, indoor test, field test and theoretical analysis. The following research results are obtained: (1) through the ten day high-speed XXX section along ten days On the site investigation of expansive soil slope disease, the geological survey of this section is obtained. The disease type, scale, deformation and damage characteristics and distribution law of slope slope, structure and drainage system along the slope are obtained. (2) the formation mechanism of the disease is obtained by indoor test and theoretical analysis. The content of the soil is high and the montmorillonite is montmorillonite. In the case of water expansion, water loss and shrinkage, after a long dry and wet cycle, the shear strength of soil mass decreases and the slope body appears cracks, bulging and sliding under the repeated action of dry and wet cycle. Under the repeated action of the expansion force, the height of the pressure area decreases, the neutralization axis rises, the deflection increases, the stiffness degenerates, the strength is reduced, and the strength is reduced. When the strength of the structure is reduced to the expansion force, the deformation and even damage occur. The formation of the disease of the drainage system is the result of the joint effect of the poor maintenance, the design defects and the characteristics of the expansive soil. (3) on the basis of the field test and the monitoring results on the basis of the evaluation of the effect of the control effect, a "tilting geogrid" is proposed. "Wedge structure", "waste tire" three kinds of expansive soil slope disease treatment scheme, obtain the construction technology, post work effect and applicable conditions of each technology. (4) put forward the protection structure of the slope surface and the maintenance idea of two major plates of the slope drainage system, and give the prevention and treatment measures for the main diseases of each plate and the corresponding preventive maintenance plan. The later maintenance provides technical guidance. The research of this paper will enhance the knowledge of the maintenance personnel on the damage law of the ten day Expressway expansive soil slope during the traffic operation, improve the technical ability of the maintenance personnel, and provide theoretical support and technical guidance for the disease control of the ten day Expressway expansive soil slope, thus reducing the slope disease. The incidence of damage.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U418.5

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