南昌地铁水下区间隧道渣土改良技术研究

发布时间：2018-02-10 04:36

本文关键词： 砂卵石地层土压平衡式盾构渣土改良水下隧道　出处：《南昌工程学院》2015年硕士论文　论文类型：学位论文

【摘要】：随着城市高速的发展,我国各大中城市地铁建设进入高峰期,盾构法施工因机械化程度高、劳动强度低、安全性高、对周边环境影响小等特点而被广泛采用,成为地铁建设领域的主要施工方法之一,在广泛应用的同时,也常因渣土改良不当或失效而导致施工停顿,施工成本增加,甚者引发安全事故。为有效的避免上述问题发生,本文研究以南昌地区首个盾构法水下区间隧道艾溪湖东站~艾溪湖西站地铁区间为依托,针对在全断面砂卵石、砂砾石地层掘进中出现的“泥饼”、“喷涌”、闭塞、磨损等技术难题开展研究。研究从现场实际问题出发,采用正交试验设计法开展室内试验研究,辅以现场实践验证。系统研究了不同渣土改良材料的微观作用机理及其对地层的适应性,并采用渗透系数、摩擦系数、坍落度等指标评价改良土体的流动性、粘聚性及保水性,使得渣土改良后呈类似于牙膏状的“流塑状态”,根据室内试验结果确定在砂卵石、砂砾石地层中的最佳改良方案。现场实践验证采用试掘进的方式验证渣土改良效果,重点分析主要掘进参数及周边环境变化情况,分析研究在改良方案调整前后的盾构推力、掘进速度、刀盘扭矩、螺旋机转速、扭矩及现场监测数据的变化情况。现场实践数据表明,本文提出的渣土改良方案解决了艾东~艾西盾构区间在施工过程中遇到的一些技术难题,取得了很好的改良效果,降低了盾构长距离穿越湖泊的风险,减少了盾体及刀具的磨损,节约了掘进成本,安全有序的保证了项目的顺利实施,为后续类似工程提供借鉴经验。
[Abstract]:With the rapid development of cities, subway construction in large and medium-sized cities in China has entered the peak period. The shield method has been widely used because of its high degree of mechanization, low labor intensity, high security and little impact on the surrounding environment. As one of the main construction methods in the field of subway construction, when it is widely used, it often leads to construction stoppage due to improper or invalid improvement of residual soil, increases construction cost, and even leads to safety accidents. In order to effectively avoid the above problems, Based on the first shield method underwater section tunnel in Nanchang area, the subway section of Exi Lake East Station to Exi Lake West Station, the "mud cake", "gushing" and "blocking" appearing in the full-section sand pebble and gravel excavation are studied in this paper. Research on the technical problems such as wear and tear. Based on the actual problems in the field, the orthogonal test design method is used to carry out the indoor test research. The microcosmic action mechanism and its adaptability to the formation of different residual soil improvement materials are systematically studied, and the fluidity, cohesion and water retention of the improved soil are evaluated by using the permeability coefficient, friction coefficient and slump, etc. The "fluid-plastic state" of residual soil is similar to that of toothpaste after improvement. According to the results of laboratory tests, the best improvement scheme in sand pebble and gravel stratum is determined. Field practice proves that the method of test excavation is used to verify the effect of residue soil improvement. Emphasis is placed on the analysis of the main tunneling parameters and the changes in the surrounding environment, and the analysis and study of the shield thrust, tunneling speed, cutter head torque, rotating speed of the spiral machine before and after the adjustment of the improved scheme, The change of torque and field monitoring data shows that the residual soil improvement scheme proposed in this paper has solved some technical problems encountered in the construction process of the Aidong-Essy shield section, and achieved a good improvement effect. It can reduce the risk of shield tunneling through lake, reduce the wear of shield body and tool, save the cost of tunneling, ensure the smooth implementation of the project safely and orderly, and provide reference experience for the following similar projects.
【学位授予单位】：南昌工程学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.43;U231.3

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