软土地基上南水北调PCCP供水管线工程施工关键技术研究

发布时间：2018-04-08 17:19

本文选题：南水北调　切入点：PCCP管　出处：《天津大学》2014年博士论文

【摘要】：南水北调工程是解决天津地区水资源紧缺的重要途径，其中南水北调中线工程是将天津干线输送的长江水调蓄供给到天津市各供水区的供水工程，供水工程主要采用PCCP管的施工工艺。由于天津地区特别是滨海新区为新近沉积地层，地基大多为含水量较大的淤泥质粘土，其工程特性对管道安装工艺要求较高，回填施工工艺的合理选取与控制难度较大。因此，研究合理的回填施工工艺是天津市配套供水管线工程回填施工中亟待解决的关键问题。另外，南水北调天津市配套工程建设输水管线经过很多鱼塘地段，土承载力低、孔隙比大、与周边土质差异较大，易产生地基不均匀沉降变形，造成管口转角较大而影响PCCP管的安全运行。因此，结合本工程实际情况，在满足抗渗且便于安装的条件下，有必要对PCCP管道关键技术进行相关研究，本文主要通过室内试验、现场试验以及数值分析的手段进行以下方面的研究： (1)天津软土地基大多属于淤泥质粘土，，工程性质比较复杂，并且土质不均匀，因而结合PCCP管的工作特性对土体的变形特性、承载特性通过室内试验进行研究； (2)通过现场试验段提出适应于天津地区软土地基的PCCP管工程回填土合理的压实度、施工工艺及质量控制措施，通过研究提出一种适用于PCCP管地基和回填土压实度的安全、便捷的检测方法。 (3)结合现场试验及理论分析，对不同回填压实度情况下管道结构安全计算，通过计算地基不均匀沉降对PCCP管口相对转角分析计算，确定相对转角实际应用值范围。
[Abstract]:The South-to-North Water transfer Project is an important way to solve the shortage of water resources in Tianjin area. Among them, the South-to-North Water transfer Project is a water supply project for regulating and storing the Yangtze River water transported by Tianjin trunk lines to various water supply areas in Tianjin.Water supply project mainly adopts the construction technology of PCCP pipe.Because Tianjin, especially in Binhai New area, is a newly deposited stratum, the foundation is mostly silt clay with high water content, so the engineering characteristics of the silt clay require high pipeline installation technology, and the reasonable selection and control of backfill construction technology is more difficult.Therefore, the research of reasonable backfill construction technology is the key problem to be solved urgently in the backfill construction of Tianjin water supply pipeline project.In addition, the construction of water conveyance pipelines in Tianjin for South-to-North Water transfer Project has passed through many fish ponds. The soil bearing capacity is low, the porosity ratio is large, and the soil quality is quite different from the surrounding soil, which can easily lead to uneven settlement and deformation of the foundation.Because of the large nozzle angle, the safe operation of PCCP pipe is affected.Therefore, according to the actual situation of the project, it is necessary to study the key technology of PCCP pipeline under the condition of impermeability and easy installation.Field testing and numerical analysis means to carry out the following studies:1) Tianjin soft soil foundation mostly belongs to silt clay, the engineering property is more complex, and the soil quality is not uniform, so combined with the working characteristics of PCCP pipe, the deformation and bearing characteristics of soil are studied through laboratory tests.The reasonable compaction degree, construction technology and quality control measures of backfill for PCCP pipe engineering suitable for soft soil foundation in Tianjin area are put forward through field test section, and a kind of safety suitable for PCCP pipe foundation and backfill soil compaction degree is put forward through research.Convenient detection method.In combination with field test and theoretical analysis, the safety calculation of pipeline structure under different backfill compaction degree is carried out. By calculating the relative rotation angle of PCCP pipe mouth by calculating the uneven settlement of foundation, the practical application range of relative rotation angle is determined.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TV672

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