矩形盾构隧道施工风险定量评价与风险控制研究

发布时间：2018-12-12 10:47

【摘要】：本案例场地属于宁波市岩层地层区,主要为白垩系紫红色粉砂岩和局部分布的燕山晚期喷出岩玄武岩,第四纪地层发育厚度较大,且层位较稳定,厚度约55-100m,从中更新世至全新世地层发育齐全。在对宁波轨道交通盾构隧道工程进行全面建设的过程中,该隧道的地质结构较为复杂,且自然环境十分恶劣,这些因素的存在造成了该项目在实施过程中具有极大的风险。地铁盾构隧道工程具有社会影响面广、投资款项巨大、建设工程体量庞大、工程工序繁复、且风险因素多,一旦遭遇险情,将会产生较为恶劣性的影响。因此,需要在隧道工程施工之前进行风险的预判、分析及准备应对措施,为后续工程施工打下坚定的基础。本文在案例分析的过程中,对宁波轨道交通矩形盾构隧道在施工过程中的风险控制具有深远的意义。本文在具体分析研究过程中,主要的内容从以下几个方面进行展开,即:(1)根据国内外近几年风险管理的基本研究现状进行总结,对于盾构隧道工程风控这一方面所存在的问题进行归纳与梳理。在此基础上,结合风险分析理论,对具体案例中的风险控制与评估提出可行性的方案;(2)通过工程风险的基本定义,对基本的风险类与特征进行简要的介绍,从具体工程相关的风险管理方面对相关的理论进行深入化的论述与分析。(3)建立矩形盾构隧道施工风险模糊综合评价体系,以宁波市轨道交通3号线一期地下土建工程TJ3111标段及宁波市轨道交通3号线一期工程出入段线矩形盾构施工(黄家村站、陈婆渡站~黄家村站区间、陈婆渡站、姜山出入段线明挖和矩形盾构区间,整个隧道一共是2站2区间)工程为具体的实例,通过层次分析方式对其中相关的风险因素进行全面性的分析与探究。在此基础上,结合模糊评价分析方式,提出了针对性的技术措施。(4)在风险评价基础上,针对本工程盾构进行了矩形盾构和圆形盾构的对比分析,同时进行了进出洞施工风险、穿越特殊地段、管片拼装施工风险的技术措施分析,提出了宁波地铁矩形盾构隧道施工的质量保证措施。
[Abstract]:The site of this case belongs to the lithostratigraphic area of Ningbo, mainly Cretaceous purplish red siltstone and locally distributed late Yanshanian exhalation basalt. The Quaternary strata are relatively thick and stable, and the thickness is about 55-100 m. From the Middle Pleistocene to the Holocene, the strata are well developed. In the process of overall construction of shield tunneling project of Ningbo rail transit, the geological structure of the tunnel is more complicated and the natural environment is very bad. The existence of these factors causes the great risk in the implementation of the project. The shield tunnel project of subway has a wide range of social influence, huge investment, huge volume of construction engineering, complicated engineering process and many risk factors. Once encountered with dangerous situation, it will have a more bad effect. Therefore, it is necessary to prejudge, analyze and prepare the risk before the tunnel construction, so as to lay a firm foundation for the subsequent construction. In the course of case analysis, this paper has profound significance for risk control of Ningbo rail transit rectangular shield tunnel in construction process. In the process of concrete analysis and research, the main contents are as follows: (1) according to the basic research situation of risk management at home and abroad in recent years, The existing problems in wind control of shield tunnel engineering are summarized and sorted out. On this basis, combining with the theory of risk analysis, the feasibility of risk control and evaluation in specific cases is put forward. (2) through the basic definition of engineering risk, the basic risk classes and characteristics are briefly introduced. The related theories are discussed and analyzed from the aspect of risk management related to specific projects. (3) the fuzzy comprehensive evaluation system of construction risk of rectangular shield tunnel is established. The rectangular shield construction of the first phase underground civil engineering of Ningbo Rail Transit Line 3 and the first phase of Ningbo Rail Transit Line 3 is carried out by rectangular shield construction (Huangjiacun Station, Chenpodu Station ~ Huangjiacun Station, Chen Bodu Station, Chenpo Duyu Station, and Huangjiacun Station). The project of line opening excavation and rectangular shield tunneling in Jiang Shan's entrance and exit section, which consists of 2 stations and 2 sections, is a concrete example. The related risk factors are comprehensively analyzed and explored by means of analytic hierarchy process (AHP). On this basis, combined with the fuzzy evaluation and analysis method, put forward targeted technical measures. (4) on the basis of risk assessment, the rectangular shield and circular shield are compared and analyzed. At the same time, the paper analyzes the construction risk of entering and leaving the tunnel, crossing the special section and assembling the segment, and puts forward the quality assurance measures for the construction of Ningbo subway rectangular shield tunnel.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.43

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