滨海地层冻结围护地铁联络通道冻胀性态研究
发布时间：2018-12-29 15:39
【摘要】：在修建地铁隧道联络通道时常采用人工冻结方法。与普通加固方法相比,滨海地区软弱富水地层修建地铁联络通道时采用人工冻结法更具有支护稳定、止水性好、强度大、灵活性好的特点。但联络通道冻结施工过程中,冻土的物理力学性质会发生改变,导致产生冻胀现象。地面上的建筑(构筑)物、已修建好的隧道、地下管线等均会受到冻胀的影响,可能产生裂缝,严重时结构可能发生破坏。为控制冻胀作用对建筑物和地表产生的影响,有必要对滨海地区地铁联络通道冻结温度场随冻结时间的变化规律、冻胀变形的影响范围等问题进行研究。本文结合福州地铁1号线三叉街站~白湖亭站区间联络通道水平冻结工程实例,通过滨海地层人工冻土物理力学性能研究、ABAQUS有限元三维数值模拟与冻结施工现场实测的方法,研究了滨海地层地铁联络通道人工冻结施工过程中温度场发展和分布规律、位移场大小与分布情况。数值模拟与现场实测对比的结果验证了有限元三维模拟联络通道冻结施工的可靠性,表明冻结施工三维数值模拟可以预测类似工程温度场、位移场分布,并为滨海地层人工冻结工程提供设计依据与借鉴经验。主要研究内容与结论:1.通过对滨海地层福州地区地铁车站表土进行人工冻结物理力学性能试验,研究土体常温和冻结状态下基本物理力学参数的变化规律,得到土体密度、含水率、导热系数(包括冻土导热系数)、比热容等物理参数和冻土弹性模量、单轴抗压强度、冻胀率和冻胀力等力学参数。2.结合工程实例,利用得到的物理力学参数建立联络通道冻结施工三维有限元数值模型,考虑导热系数随温度变化以及冻土相变潜热的影响,研究了人工冻结施工过程的温度场分布与发展规律,以及位移场分布规律与冻胀变形程度及其对地表的影响。3.对该地铁联络通道人工冻结温度随时间变化过程进行现场实测,通过观察工作面的冻结效果,结合监测反馈的数据分析了人工冻结施工过程冻结帷幕的发展分布情况,结果表明冻结设计方案合理,冻结效果良好。4.将三维有限元数值模拟结果与工程实测结果进行对比,分别将数值模拟结果和工程实测结果绘制成冻结时间-温度曲线,曲线拟合良好,数值模拟结果比较接近工程实测结果,表明三维数值模拟可以为人工冻结设计、施工提供借鉴与经验。
[Abstract]:The artificial freezing method is often used in the construction of subway tunnel contact channel. Compared with the common reinforcement method, the artificial freezing method has the characteristics of stable support, good water sealing, high strength and good flexibility when constructing subway communication channel in the weak and rich water layer of coastal area. However, the physical and mechanical properties of the frozen soil will change during the freezing construction of the connection channel, resulting in frost heaving. Buildings (structures), tunnels and underground pipelines on the ground will be affected by frost heaving, which may lead to cracks and damage to structures in serious cases. In order to control the influence of frost heaving on buildings and surface, it is necessary to study the change of freezing temperature field with freezing time and the influence range of frost heave deformation in the subway connecting channel in coastal area. In this paper, based on the example of horizontal freezing project between Sanchachujie Station and Baihu Ting Station of Fuzhou Metro Line 1, through the study of physical and mechanical properties of artificial frozen soil in coastal strata, the method of ABAQUS finite element three-dimensional numerical simulation and site measurement of freezing construction is presented. This paper studies the development and distribution of temperature field, displacement field and distribution during artificial freezing construction of subway connection channel in coastal strata. The comparison between the numerical simulation and the field measurement verifies the reliability of the freezing construction of the finite element three-dimensional simulation connecting channel, which indicates that the three-dimensional numerical simulation of the freezing construction can predict the temperature field and displacement field distribution of similar projects. It also provides the design basis and experience for artificial freezing engineering of coastal strata. Main contents and conclusions: 1. Based on the experiments of artificial freezing physical and mechanical properties of the surface soil of subway station in Fuzhou area of coastal strata, the variation law of basic physical and mechanical parameters of soil under normal temperature and freezing state is studied, and the density and moisture content of soil are obtained. Thermal conductivity (including thermal conductivity of frozen soil), physical parameters such as specific heat capacity and mechanical parameters such as elastic modulus of frozen soil, uniaxial compressive strength, frost heave rate and frost heave force. 2. Combined with engineering examples, the three-dimensional finite element numerical model of freezing construction of connection channel is established by using the obtained physical and mechanical parameters. The influence of the change of thermal conductivity with temperature and the latent heat of phase change in frozen soil are considered. The distribution and development of temperature field, the distribution of displacement field, the degree of frost heave deformation and its influence on the ground surface during artificial freezing construction are studied. Based on the observation of freezing effect of working face and the data of monitoring feedback, the development and distribution of freezing curtain during artificial freezing construction are analyzed. The results show that the freezing design is reasonable and the freezing effect is good. 4. The results of 3D finite element numerical simulation are compared with the measured results of engineering. The results of numerical simulation and engineering measurement are drawn into freezing time-temperature curves respectively. The curves fit well, and the results of numerical simulation are close to the measured results of engineering. It shows that 3D numerical simulation can provide reference and experience for artificial freezing design and construction.
【学位授予单位】：福建工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U231.3;U455.4
本文编号：2395011
[Abstract]:The artificial freezing method is often used in the construction of subway tunnel contact channel. Compared with the common reinforcement method, the artificial freezing method has the characteristics of stable support, good water sealing, high strength and good flexibility when constructing subway communication channel in the weak and rich water layer of coastal area. However, the physical and mechanical properties of the frozen soil will change during the freezing construction of the connection channel, resulting in frost heaving. Buildings (structures), tunnels and underground pipelines on the ground will be affected by frost heaving, which may lead to cracks and damage to structures in serious cases. In order to control the influence of frost heaving on buildings and surface, it is necessary to study the change of freezing temperature field with freezing time and the influence range of frost heave deformation in the subway connecting channel in coastal area. In this paper, based on the example of horizontal freezing project between Sanchachujie Station and Baihu Ting Station of Fuzhou Metro Line 1, through the study of physical and mechanical properties of artificial frozen soil in coastal strata, the method of ABAQUS finite element three-dimensional numerical simulation and site measurement of freezing construction is presented. This paper studies the development and distribution of temperature field, displacement field and distribution during artificial freezing construction of subway connection channel in coastal strata. The comparison between the numerical simulation and the field measurement verifies the reliability of the freezing construction of the finite element three-dimensional simulation connecting channel, which indicates that the three-dimensional numerical simulation of the freezing construction can predict the temperature field and displacement field distribution of similar projects. It also provides the design basis and experience for artificial freezing engineering of coastal strata. Main contents and conclusions: 1. Based on the experiments of artificial freezing physical and mechanical properties of the surface soil of subway station in Fuzhou area of coastal strata, the variation law of basic physical and mechanical parameters of soil under normal temperature and freezing state is studied, and the density and moisture content of soil are obtained. Thermal conductivity (including thermal conductivity of frozen soil), physical parameters such as specific heat capacity and mechanical parameters such as elastic modulus of frozen soil, uniaxial compressive strength, frost heave rate and frost heave force. 2. Combined with engineering examples, the three-dimensional finite element numerical model of freezing construction of connection channel is established by using the obtained physical and mechanical parameters. The influence of the change of thermal conductivity with temperature and the latent heat of phase change in frozen soil are considered. The distribution and development of temperature field, the distribution of displacement field, the degree of frost heave deformation and its influence on the ground surface during artificial freezing construction are studied. Based on the observation of freezing effect of working face and the data of monitoring feedback, the development and distribution of freezing curtain during artificial freezing construction are analyzed. The results show that the freezing design is reasonable and the freezing effect is good. 4. The results of 3D finite element numerical simulation are compared with the measured results of engineering. The results of numerical simulation and engineering measurement are drawn into freezing time-temperature curves respectively. The curves fit well, and the results of numerical simulation are close to the measured results of engineering. It shows that 3D numerical simulation can provide reference and experience for artificial freezing design and construction.
【学位授予单位】：福建工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U231.3;U455.4
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