郑州至新郑快速通道改建工程路堑边坡支护施工关键技术

发布时间：2019-05-14 12:38

【摘要】：岩土边坡工程问题是一个复杂的问题，它涉及众多学科，比如地质、结构、环境、材料和仪器，随着实验技术和数值模拟技术的日益完善，路堑边坡稳定性理论得到了更深层次的发展。保持路堑边坡的稳定性的作用是不言而喻的，它的影响是巨大的，对人民群众的人身财产安全和交通是否便捷顺利都有很大影响。同时它对保持边坡整体性，防止水土流失，对边坡周边构筑物和当地的生态环境的稳定和平衡也有比较大的影响。边坡的加固与防护也逐渐显得重要，科学合理的工程支护措施为边坡的稳定性提供了强有力的保证。本文以郑州至新郑快速通道改建工程为例，着重论述了边坡支护施工技术。本工程路堑挖深为1.65~13.9m；沿线土体主要为杂填土和粉砂土等，自立性较差，地基承载力低；路堑边坡开挖边界距离京广铁路高架桥很近。因此如何结合本路段的地层情况，制定相应的路堑支护方案以确保高架桥和京广线铁路的正常使用和沿线路段施工安全，又能经济合理、工期最优地完成工程施工，具有迫切的现实需求，为此我们需针对该工程进行专项研究。通过现场实地调研，系统总结了国内外边坡稳定性分析方法和路堑边坡支护方案及其应用范围，选取应用范围较广、工程效果和经济效果评价较好的微型桩复合土钉墙和预应力锚索灌注桩为研究对象，阐述了它们的支护机理，根据本次研究的工程实例，系统总结了详尽的施工工艺和质量控制措施，并对箱涵顶进施工技术做简要介绍。本文的主要研究内容如下：（1）首先对路堑边坡的分类、影响因素及失稳破坏模式做了介绍。（2）对郑州至新郑快速通道改建工程的工程概况，工程地质条件，周边环境条件进行说明，并制定出相应的边坡支护方案。（3）总结了钢管微型桩复合土钉墙和桩锚支护的支护机理和失稳破坏模式，简单介绍了计算方法，，并对其稳定性进行验算。（4）结合本工程所需施工技术，系统阐述了钢管微型桩复合土钉墙、预应力锚索灌注桩、箱涵顶进的施工工艺和技术要求。
[Abstract]:Geotechnical slope engineering is a complex problem, which involves many disciplines, such as geology, structure, environment, materials and instruments. With the increasing improvement of experimental technology and numerical simulation technology, The stability theory of cutting slope has been further developed. The function of maintaining the stability of cutting slope is self-evident, its influence is huge, and it has a great influence on the safety of people's personal property and whether the traffic is convenient and smooth. At the same time, it also has a great impact on maintaining the integrity of the slope, preventing soil and water loss, and on the stability and balance of the structures around the slope and the local ecological environment. The reinforcement and protection of slope is becoming more and more important, and scientific and reasonable engineering support measures provide a strong guarantee for the stability of slope. Taking Zhengzhou to Xinzheng Expressway Reconstruction Project as an example, this paper focuses on the construction technology of slope support. The cutting excavation depth of this project is 1.65 脳 13.9m, and the soil along the project is mainly mixed fill and silt, which is poor in self-supporting and low in bearing capacity of foundation. The excavation boundary of cutting slope is very close to the viaduct of Beijing-Guangzhou Railway. Therefore, how to formulate the corresponding cutting support scheme to ensure the normal use of viaduct and Beijing-Guangzhou line railway and the construction safety along the road section, and how to complete the project construction economically and reasonably, and how to complete the project construction optimally during the construction period? There is an urgent practical demand, so we need to carry out special research on the project. Through field investigation, the methods of slope stability analysis at home and abroad, cutting slope support scheme and its application scope are systematically summarized, and the application range is wide. The composite soil nailing wall and prestressed anchor cable cast-in-place pile with fine evaluation of engineering effect and economic effect are the research objects, and their supporting mechanism is expounded. according to the engineering example of this study, The detailed construction technology and quality control measures are systematically summarized, and the jacking construction technology of box culvert is briefly introduced. The main contents of this paper are as follows: (1) the classification, influencing factors and instability failure mode of cutting slope are introduced at first. (2) the engineering situation, engineering geological conditions and surrounding environmental conditions of Zhengzhou to Xinzheng Expressway Reconstruction Project are explained, and the corresponding slope support scheme is worked out. (3) the supporting mechanism and unstable failure mode of steel pipe micro-pile composite soil nailing wall and pile-anchor support are summarized, the calculation method is briefly introduced, and the stability of the composite soil nailing wall and pile-anchor support is checked and calculated. (4) combined with the construction technology needed in this project, the construction technology and technical requirements of steel pipe micro-pile composite soil nailing wall, prestressed anchor cable cast-in-place pile and box culvert jacking are systematically expounded.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1

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