浅埋暗挖地铁车站结构型式和施工方法优化研究
发布时间：2018-11-19 09:00
【摘要】：在浅埋暗挖地铁车站设计和施工过程中,如何经过合理的技术、经济、环境比较后最终确定合理的车站结构型式和施工方法显得尤为重要。针对地铁车站结构型式多样化和复杂的周边环境对暗挖车站的施工方法提出更高要求的现状,综合采用统计分析、试验优化设计、数值模拟、现场监测等多种研究手段进行了系统的研究,主要开展了以下几方面工作:(1)建立了浅埋暗挖地铁车站结构型式和施工方法优化体系。从系统论的观点出发,提出了浅埋暗挖地铁车站结构型式和施工方法的优化思想和优化原则,建立了浅埋暗挖地铁车站优化体系的构架,并将地铁车站的优化设计按其阶段不同划分为五个层次:结构选型的概念优化、结构断面型式的单指标试验设计、结构断面型式的多指标试验设计、施工方法的综合比选、施工过程控制。(2)提出了浅埋暗挖地铁车站结构选型的概念优化方法。在总结浅埋暗挖地铁车站各类结构型式的各自特点的基础上,提出了不同地质条件下浅埋暗挖地铁车站结构型式的优选原则,并提出当地质条件相近或相同时,在满足车站使用功能、周边环境条件允许的前提下,综合考虑车站结构的受力性能和防水效果,浅埋暗挖地铁车站的结构断面型式应尽量遵循"宜单不宜双,宜近不宜连"的原则。(3)基于单指标正交试验,研究了不同的地铁车站结构断面参数对地表沉降、洞周收敛偏差值、围岩塑性区面积、应力集中等力学指标,以及开挖断面面积和衬砌周长等经济指标的影响规律,探讨了地铁车站结构断面形状及洞室布置参数、本构模型参数、支护参数等11项因素对各项试验指标的影响程度,并确定了影响该指标的因素主次顺序。(4)基于多指标正交试验,进行了地铁车站结构断面形状及洞室布置参数、本构模型参数、支护参数的多指标问题的求解,获得了兼顾地表沉降、洞周收敛偏差值、围岩塑性区面积、应力集中等力学指标,以及开挖断面面积和衬砌周长等经济指标的最优试验方案,探索出适用于求解浅埋暗挖地铁车站结构断面型式多指标优化问题的最小隶属度偏差方法和质量损失函数方法。(5)基于大量调研资料,分析了国内外典型全暗挖和局部暗挖地铁车站的结构型式、主体结构尺寸、拱顶覆土厚度及暗挖施工方法,并进行了归类总结,在此基础上,对各种结构型式暗挖车站常用的施工方法进行了经济技术比较,据此提出了适于不同结构型式暗挖车站的施工方法。(6)基于变位分配原理,通过数值模拟对地铁车站施工产生的地层变形进行分阶段预测,制定各阶段控制标准的预警值、报警值和最终控制值,将地表沉降的控制标准分解到每个施工阶段中,与施工监测相配合对变形进行分步控制,将每一步的变形值控制在控制标准内.实现了较为准确的地表变形过程控制。
[Abstract]:In the process of design and construction of shallow excavated subway station, it is very important to determine the reasonable structure type and construction method of subway station after reasonable technology, economy and environment comparison. In view of the situation that the subway station structure is diversified and complicated surrounding environment puts forward higher requirements for the construction method of the underground excavation station, the comprehensive use of statistical analysis, experimental optimization design, numerical simulation, Several research methods, such as field monitoring, have been systematically studied, and the following work has been carried out: (1) the structure type and construction method optimization system of shallow underground excavated subway station has been established. From the point of view of system theory, this paper puts forward the optimization thought and principle of the structure type and construction method of shallow underground excavating subway station, and establishes the framework of the optimization system of shallow buried underground excavation subway station. The optimization design of subway station is divided into five levels according to its stage: conceptual optimization of structural selection, single index test design of structural section type, multi-index test design of structural cross-section type, comprehensive comparison and selection of construction methods. Construction process control. (2) Conceptual optimization method for structural selection of shallow underground excavated subway station is proposed. On the basis of summing up the characteristics of various structural types of shallow underground excavated subway station, this paper puts forward the optimum selection principle of shallow buried underground subway station structure type under different geological conditions, and puts forward that when the geological conditions are similar or identical, On the premise of satisfying the station operation function and permitting the surrounding environment, considering comprehensively the stress performance and waterproof effect of the station structure, the structural cross-section type of the shallow buried underground subway station should follow as far as possible "should be single instead of double," (3) based on the single index orthogonal test, the mechanical indexes such as surface subsidence, convergence deviation value, plastic zone area of surrounding rock, stress concentration and so on of different structural cross-section parameters of subway station are studied, such as surface subsidence, convergence deviation value of tunnel circumference, area of surrounding rock plastic zone, stress concentration and so on. The influence law of economic indexes such as excavation cross-section area and lining perimeter is discussed. The influence degree of 11 factors, such as section shape of subway station structure, tunnel layout parameter, constitutive model parameter, support parameter and so on, on each test index is discussed. The main and secondary order of the factors affecting the index is determined. (4) based on the orthogonal test of multiple indexes, the multi-index problems of section shape, tunnel layout parameters, constitutive model parameters and support parameters of subway station structure are solved. The optimal test scheme is obtained, which takes into account the mechanical indexes such as surface subsidence, convergence deviation value around the hole, plastic zone area of surrounding rock, stress concentration and other economic indexes, such as the area of excavation section and the perimeter of lining, etc. The minimum membership deviation method and mass loss function method for multi-index optimization of subsurface excavation subway station structure are explored. (5) based on a large number of investigation data, the minimum membership deviation method and mass loss function method are proposed. This paper analyzes on the structural types, main structure dimensions, thickness of overlying soil and construction methods of underground excavation of typical fully and partially excavated subway stations at home and abroad, and summarizes the methods of construction, on the basis of which, In this paper, the common construction methods of various structural types of underground excavation stations are compared economically and technologically, and the construction methods suitable for different structural types of underground excavation stations are put forward. (6) based on the principle of displacement distribution, Through numerical simulation, the formation deformation caused by subway station construction is predicted in stages, and the early warning value, alarm value and final control value of control standard for each stage are worked out, and the control standard of ground subsidence is decomposed into each construction stage. The deformation is controlled step by step with construction monitoring, and the deformation value of each step is controlled within the control standard. More accurate control of surface deformation process is realized.
【学位授予单位】：北京交通大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：U231.3
本文编号：2341799
[Abstract]:In the process of design and construction of shallow excavated subway station, it is very important to determine the reasonable structure type and construction method of subway station after reasonable technology, economy and environment comparison. In view of the situation that the subway station structure is diversified and complicated surrounding environment puts forward higher requirements for the construction method of the underground excavation station, the comprehensive use of statistical analysis, experimental optimization design, numerical simulation, Several research methods, such as field monitoring, have been systematically studied, and the following work has been carried out: (1) the structure type and construction method optimization system of shallow underground excavated subway station has been established. From the point of view of system theory, this paper puts forward the optimization thought and principle of the structure type and construction method of shallow underground excavating subway station, and establishes the framework of the optimization system of shallow buried underground excavation subway station. The optimization design of subway station is divided into five levels according to its stage: conceptual optimization of structural selection, single index test design of structural section type, multi-index test design of structural cross-section type, comprehensive comparison and selection of construction methods. Construction process control. (2) Conceptual optimization method for structural selection of shallow underground excavated subway station is proposed. On the basis of summing up the characteristics of various structural types of shallow underground excavated subway station, this paper puts forward the optimum selection principle of shallow buried underground subway station structure type under different geological conditions, and puts forward that when the geological conditions are similar or identical, On the premise of satisfying the station operation function and permitting the surrounding environment, considering comprehensively the stress performance and waterproof effect of the station structure, the structural cross-section type of the shallow buried underground subway station should follow as far as possible "should be single instead of double," (3) based on the single index orthogonal test, the mechanical indexes such as surface subsidence, convergence deviation value, plastic zone area of surrounding rock, stress concentration and so on of different structural cross-section parameters of subway station are studied, such as surface subsidence, convergence deviation value of tunnel circumference, area of surrounding rock plastic zone, stress concentration and so on. The influence law of economic indexes such as excavation cross-section area and lining perimeter is discussed. The influence degree of 11 factors, such as section shape of subway station structure, tunnel layout parameter, constitutive model parameter, support parameter and so on, on each test index is discussed. The main and secondary order of the factors affecting the index is determined. (4) based on the orthogonal test of multiple indexes, the multi-index problems of section shape, tunnel layout parameters, constitutive model parameters and support parameters of subway station structure are solved. The optimal test scheme is obtained, which takes into account the mechanical indexes such as surface subsidence, convergence deviation value around the hole, plastic zone area of surrounding rock, stress concentration and other economic indexes, such as the area of excavation section and the perimeter of lining, etc. The minimum membership deviation method and mass loss function method for multi-index optimization of subsurface excavation subway station structure are explored. (5) based on a large number of investigation data, the minimum membership deviation method and mass loss function method are proposed. This paper analyzes on the structural types, main structure dimensions, thickness of overlying soil and construction methods of underground excavation of typical fully and partially excavated subway stations at home and abroad, and summarizes the methods of construction, on the basis of which, In this paper, the common construction methods of various structural types of underground excavation stations are compared economically and technologically, and the construction methods suitable for different structural types of underground excavation stations are put forward. (6) based on the principle of displacement distribution, Through numerical simulation, the formation deformation caused by subway station construction is predicted in stages, and the early warning value, alarm value and final control value of control standard for each stage are worked out, and the control standard of ground subsidence is decomposed into each construction stage. The deformation is controlled step by step with construction monitoring, and the deformation value of each step is controlled within the control standard. More accurate control of surface deformation process is realized.
【学位授予单位】：北京交通大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：U231.3
【引证文献】
相关硕士学位论文 前1条
1 洪俊杰;北京暗挖地铁车站变形数据统计分析与施工优化[D];北京交通大学;2017年
，本文编号：2341799
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