淤泥质地层地下通道暗挖施工风险分析与地层加固研究

发布时间：2018-06-15 19:53

本文选题：淤泥 + 地层稳定　；参考：《中南大学》2014年博士论文

【摘要】：摘要：如何确保淤泥质地层中的地下工程施工安全是工程界迫切需要解决的技术难题。本文针对淤泥质地层地下通道暗挖施工技术,依托多个市区地下人行通道工程实例,采用理论分析、数值模拟和现场工程验证等手段进行研究,提出了淤泥质地层改良加固方案及施工工艺并在现场得到检验,主要内容如下： (1)通过文献调研总结了我国城市淤泥质地层分布特征,分析了淤泥质地层的工程特性及在该地层进行暗挖隧道施工难点。 (2)采用风险管理手段建立了淤泥质地层地下通道暗挖施工风险评估模型,进行了相应的风险分析,揭示了风险源,提出了施工风险控制措施。 (3)扩展应用岩土工程稳定性分析的极限分析上限有限元法,展开多种参数条件下的地层稳定性分析,探讨了加固圈厚度和加固参数等因素对隧道横断面稳定性的影响,获得了暗挖隧道地层失稳破坏特征,论证了包含加固圈的淤泥质地层暗挖隧道稳定性、破坏规律和加固机理,提出了地层注浆加固建议。 (4)在淤泥质地层工程特性及暗挖隧道地层失稳破坏特征研究基础上,分析现有的地层加固改良方法的具体特征,明确各种地层加固改良方法的适用条件。 (5)以多个典型的淤泥质地层地下通道工程现场实例为依托,分别采用上限有限元法和有限差分法数值计算手段,分析了暗挖通道地层稳定性和结构变形与安全性。从施工角度讨论了工程外部环境条件、淤泥质地层具体特性、以及暗挖工法的实施难点,在工程现场实施并检验以WSS注浆为主、TSS注浆为辅、并结合拱部大管棚的综合地层预加固方案及施工工艺。图127幅,表72个,参考文献147篇。
[Abstract]:Absrtact: how to ensure the construction safety of underground engineering in silt layer is an urgent technical problem in engineering field. In this paper, based on many practical examples of underground pedestrian passage in urban area, theoretical analysis, numerical simulation and field engineering verification are used to study the construction technology of underground tunnel in silt layer. The improvement and reinforcement scheme and construction technology of silt texture layer are put forward and tested in the field. The main contents are as follows: 1) the distribution characteristics of silt texture layer in cities of China are summarized through literature investigation. This paper analyzes the engineering characteristics of silt texture layer and the difficulties of tunneling construction in this stratum. (2) risk assessment model for underground tunnel excavation of silt layer is established by means of risk management, and the corresponding risk analysis is carried out. The risk source is revealed and the construction risk control measures are put forward. The upper limit finite element method of limit analysis for stability analysis of geotechnical engineering is extended to analyze the formation stability under various parameters. In this paper, the influence of the thickness of reinforcement ring and reinforcement parameters on the stability of tunnel cross section is discussed. The failure characteristics of undercut tunnel strata are obtained, and the stability, failure law and reinforcement mechanism of silt layer with silt texture including reinforcement ring are demonstrated. On the basis of the study on the engineering characteristics of silt layer and the failure characteristics of undercut tunnel strata, the concrete characteristics of the existing methods of stratum reinforcement and improvement are analyzed. Based on several typical examples of underground tunnel engineering in silt layer, the upper limit finite element method and finite difference method are used to calculate numerical value respectively. The stability, structural deformation and safety of undercut tunnel strata are analyzed. From the point of view of construction, this paper discusses the external environmental conditions of the project, the concrete characteristics of the silt texture layer, and the difficulties in the implementation of the underground excavation method. Combined with the arch pipe shed comprehensive stratum pre-reinforcement scheme and construction technology. 127 figures, 72 tables, 147 references.
【学位授予单位】：中南大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU714;TU94

【参考文献】