【作者】 田根宏；

【导师】 党发宁； 董忠级；

【作者基本信息】 西安理工大学 ， 建筑与土木工程， 2008， 硕士

【摘要】 西安市是陕西省的省会,也是陕西发展最快的城市,西安的发展对陕西的发展起着至关重要的作用。西部大开发,西安作为重点发展城市,交通问题就显得十分重要。随着城市化建设的不断扩大和人口的增长,交通的承载力越来越大,而地面的有限可用面积越来越少,因此建设地下铁路对于西安的发展起着至关重要的作用。本文对西安市地铁二号线上黄土的物理力学性质和工程特性进行研究,主要有以下内容：1根据室内土工试验及原位测试统计结果,采用多种方法并结合西安地区建筑经验,综合确定各土层的承载力、变形模量E0。采用室内试验、扁铲侧胀试验、公式计算及查表法等综合方法,确定二号线内土的侧压力系数K0。2依据室内土工试验统计结果,按四种规范确定地基土对挡土墙基底的摩擦系数μ,综合各规范查表结果并结合工程经验综合给出建议值。3试验分析出各层土物理力学指标统计结果,并按有关规范、手册及地区经验综合给出各层土的岩土参数建议值(土的一般物理力学性质指标建议值采用数理统计求得的算术平均值；各层土的抗剪强度指标是根据各层土的c、φ指标标准值结合工程经验给出)。4对二号线黄土的其它工程地质性状和其它指标进行分析,对不利的情况提出建议与意见,为西安地铁二号线的建设提供参考性资料。本文在研究西安地铁二号线黄土性质的基础上,对地铁隧道开挖前后土体的位移与应力应用商业软件ANSYS进行三维模拟,分析开挖后作用于隧道衬砌上的围岩应力是否超过衬砌强度,为该工程的安全、顺利进行打下了基础,具有重要的理论价值和实际意义。更多还原

【Abstract】 Xi’an, the city is the capital of Shaanxi Province, and is also the most developed city in Shaanxi. So Xi’an’s development is very important to Shaanxi.In tne development of the West Regions, as the prioritize city, the transportation in Xi’an appears extremely importantly. Expands and the population growth unceasingly along with the urbanized construction, the transportation supporting capacity is getting bigger and bigger, but the ground limited available area are getting fewer and fewer, therefore metro construction is critical to Xi’an development. This article analyse the loess mechanical properties on the metrosecond line, and the mainly content is following:1. According to the statistical result from indoor geotechnical test and the in-site test, we have given the supporting capacity and modulus of deformation Eo in various soil layers useing many kinds of methods and unifiying the construct the experience in Xi’an area.At the same time, we can get the earth lateral pressure coefficient Ko by useing synthetically indoor test, formula computation and look-up table and so on.2. According to the statistical result from indoor geotechnical test, we can get the friction coefficientμbetween the bottom and the basis of the retaining wall, then we obtion the reference number useing many kinds of methods and unifiying the construct the experience.3. Though the experiment we analyzes and obtain the statistics results of each layer physics index and mechanics index, and then we give synthetically the parameter suggestion value of each layer according to the related standard, the manual and the local experience. (the suggestion value of the earth conventional physics index and mechanics index are obtained using mathematical statement; The shearing strength of each layer is obtained according to each earth c、φ, as well as considering the project experience).4. Analyzing other engineering geology condition and other indexes of the loess, we give the judegments and suggestions to the disadvantageous situation, providing the referential material for the second line of metro in Xi’an.Based on the studies of the loess physics properties and mechanical properties of the second line subway, we carry on the simulation to the stress and displacement of the subway excavation with commercial software ANSYS, and analyse whether the stress of the liner surpasses itselfe compression andtensile strengh, which is important to project security, as well as having the important theory and the practical significance for this project.更多还原