富水软土地质条件穿越城区浅埋暗挖关键施工技术研究

发布时间：2018-05-12 10:15

本文选题：城际轨道 + 隧道施工　；参考：《石家庄铁道大学》2015年硕士论文

【摘要】：目前,全国有三十多个城市已经获批修建地铁,我国修建城际轨道暗挖隧道的最重要、最普遍的施工方法是矿山法。如何能安全、经济的使用矿山法施工,顺利通过浅埋及居民区是一个施工企业施工水平的重要标志。尤其是洞内止水技术近年来发展十分迅速,出现了WSS等众多新工艺、新技术。因此,研究矿山法施工技术的创新,意义非常重大。本文依托“莞惠城际轨道穿越城区浅埋暗挖隧道施工技术的研究(J10-05B)”项目,根据现场及其复杂的工程地质及水文地质条件,取得各类信息资料及调研资料,对浅埋暗挖穿越城区道路、老龄浅基房屋、地表沉降控制、地下管线保护及周边环境保护等进行了全面的分析总结研究,完成相关研究项目。本文的主要研究内容和成果包括以下几个方面。(1)根据现场地质情况变化,勘察工程地质,查明各类工程地质性质,有利于对不同地质条件选择不同施工工法提供判断依据。掌握在不同地质环境、不同地面条件下及时调整工法步距。掌握超前支护的作用及施工方法。(2)优化施工工艺,将CD法优化为上CD下台阶法,增设临时仰拱,防止隧道收敛变形,缩短工法步距,先成小环,然后逐步整体成环。解决了地表沉降大、房屋裂缝、管线破坏、初支侵限等难题,将施工引起的地面沉降和隆起控制在环境条件允许的范围以内,确保建筑物基础和地下管线安全使用,确保城区道路安全通行,保障沿线居民正常生活。(3)由于地质结构差,地下水丰富,易产生沉降,全断面注浆可有效减少围岩变形,确保隧道安全及道路行车安全。通过全断面注双液浆,熟练掌握了注浆技术,分析不同地质条件下选用不同注浆材料和注浆设备,达到方便施工,经济高效的目的,为以后类似工程提供施工经验。(4)优化双液浆材料,采用氯化钙及水玻璃的化学反应,快速止水,节省注浆材料。
[Abstract]:At present, more than 30 cities in China have been approved to build subway, the most important and the most common construction method is mine method. How to use mine method safely and economically and pass through shallow burying and residential area is an important sign of construction level of a construction enterprise. Especially in recent years, the watertight technology in the tunnel has developed rapidly, and many new technologies, such as WSS, have emerged. Therefore, it is of great significance to study the innovation of mine construction technology. Based on the project of "Guanghui Intercity Rail Crossing shallow Underground Tunnel Construction Technology (J10-05B)", according to the site and its complicated engineering geology and hydrogeological conditions, various kinds of information and investigation materials are obtained. In this paper, comprehensive analysis and research are carried out on the subsurface excavated road through the urban area, the aging shallow foundation house, the surface subsidence control, the underground pipeline protection and the surrounding environmental protection, and the related research projects are completed. The main research contents and achievements of this paper include the following aspects: 1) according to the change of the field geological conditions, the investigation of engineering geology and the identification of various engineering geological properties will be helpful to provide a basis for judging the selection of different construction methods for different geological conditions. Master in different geological environment, different surface conditions to adjust the pace of construction method. Master the function of advance support and construction method. 2) optimize construction technology, optimize CD method into upper CD step method, add temporary inverted arch, prevent tunnel convergent deformation, shorten step distance of construction method, first form small ring, then gradually form whole ring. It solves the problems of large ground subsidence, building cracks, pipeline damage, initial support invasion and so on, and controls the ground subsidence and uplift caused by construction within the scope of environmental conditions, so as to ensure the safe use of building foundation and underground pipeline. Because of the poor geological structure, abundant groundwater and easy settlement, the whole section grouting can effectively reduce the surrounding rock deformation and ensure the tunnel safety and road safety. Through the full section injection of double liquid slurry, the grouting technology is skillfully mastered, and the selection of different grouting materials and grouting equipment under different geological conditions is analyzed, so as to achieve the purpose of convenient construction, economy and efficiency. To provide construction experience for similar projects in the future) to optimize the double liquid slurry materials, adopt the chemical reaction of calcium chloride and water glass, quickly stop water and save grouting materials.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4

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