城市地铁隧道施工中有效保证邻近管线的安全是地铁工程的难点问题之一。在开挖过程中如何防止地层坍塌，并有效地控制开挖引起的地面沉降，保护地铁沿线地下管线的安全，已成为城市地铁工程中亟待解决的一项重要课题。开展地铁隧道施工对邻近地下管线的变形规律的研究具有重要的理论意义与工程应用价值。本文以西安地铁三号线通-胡区间隧道为背景，采用现场调查、理论分析、室内试验、数值模拟和现场监测相结合的方法开展研究工作。主要工作和结论有： （1）采用现场调查法完成了西安地铁沿线地下管线分布情况调查，得到了地下管线因地铁施工而产生破坏的主要破坏形式及破坏原因。基于专家调查法对通-胡区间地铁施工对邻近管线的变形影响因素进行分析，得出该区间影响管线变形大小的一级影响因素主要有工程地质与水文地质因素、管隧距离、施工因素和管线特性，二级影响因素主要有管线水平距离、管线垂直距离、施工方法、管线大小、管内压力、管线埋深、管线接头形式、管线与隧道角度等。 （2）基于模糊综合评判法对西安地铁区间隧道施工对其邻近管线的变形影响进行等级划分，确定了不同管线的风险等级，并提出了各等级管线变形控制标准，给出了不同安全风险等级的管线保护措施。 （3）完成了西安地铁三号线胡家庙地铁车站非饱和黄土GDS试验，得到了隧道所处地层的土体物理力学参数，分析不同含水率条件下黄土的强度和变形，为地铁施工对管线的变形影响规律的FLAC数值模拟提供了可靠的计算参数。 （4）基于Winkler弹性地基梁理论，推导出盾构施工和暗挖施工对与隧道轴线平行和垂直的刚性接口和柔性接口等地下管线的沉降、弯距和转角等理论预测公式。实践表明，预测公式计算结果与实际相符。 （5）基于FLAC数值模拟及现场监测方法得到了地铁盾构施工和暗挖施工对垂直于隧道轴线管线和平行于隧道轴线管线变形影响规律。盾构施工时，不同施工参数、不同管隧距离等因素对管线的变形影响是不同的，暗挖施工时，不同管隧距离对管线的变形影响是不同的。针对不同的施工方法所引起的地下管线变形的不同，给出了地铁不同施工方法对应的管线保护措施。 （6）基于建立的地铁隧道施工对地下管线的变形影响等级划分与控制技术理论及研究得出的不同的施工方法所引起的不同的地下管线变形规律，采用FLAC模拟预测了西安地铁三号线通-胡区间盾构施工对两隧道轴线间的钢筋混凝土排水管的变形趋势，并制定了现场变形监测方案与管线保护措施。同时采用FLAC模拟了该区间地铁暗挖对邻近管线的变形影响，预测地铁穿越了地裂缝施工后管线的变形趋势，并提出地铁隧道下穿f4地裂缝的施工技术措施，制定了地铁暗挖施工对邻近管线保护的技术措施。工程实践表明，提出的理论和控制措施合理有效。

To ensure the safety of adjacent pipeline effectively is always one difficulty of subway engineering in construction of urban metro tunnel. How to prevent the formation collapse during excavation process, effectively control the land subsidence caused by excavation, and protect the safety of metro underground pipeline, it has become an important subject that urgently needed to be solved in urban subway engineering. There has important theoretical meaning and engineering value to develop the research study in deformation of near underground pipeline. This paper taking the Tong-Hu interval tunnel of Xi'an metro Line 3 as the background, it is based on a method of combining the field survey, theoretical analysis, laboratory test, numerical simulation and field monitoring. The main works and conclusions are follows: (1) Using the method of field survey, investigating the underground pipeline distribution of Xi'an metro is completed, and obtained the main damage form and destruction causes of underground pipeline which because of metro construction. Based on the expert investigation method to analyze the effect factors of the pipelines deformation due to Tong-Hu metro tunnel interval adjacent construction, and obtained the first-level influence factors are mainly engineering geology, hydrogeology, pipe tunnel distance, construction and pipeline characteristics, the second-level influence factors are mainly horizontal distance and vertical dimension between the pipelines, construction method, pipelines size, pressure in pipe, pipelines depth, pipeline joints, pipeline and tunnel angle etc. (2) Divided the deformation effects of adjacent pipeline into grade based on fuzzy comprehensive evaluation in Xi'an metro construction, the pipeline risk grade were determined and put forward the deformation control standard of each grade pipeline, and the protection measures of pipeline in quantitative risk grade are given. (3) The laboratory GDS on unsaturated loess in Hu Jiamiao station of Xi'an metro line 3 is completed, obtained physical and mechanical parameters of soil in the department of tunnel formation, analyzed strength and deformation of loess under different level of moisture content, and provide a reliable calculation parameter for FLAC numerical simulation of deformation influence on the pipeline due to subway construction. (4) Based on Elastic Winkler Spring, the theoretical predicting formula of piles settlement/ bending / angle of this are parallel/ perpendicular to tunnel axis with rigid /flexible joints in shield construction and tunneling construction is derived, the practice shows that the prediction formula results are close to actual experiences. (5) The influence law of pipeline deformation of which parallel/ perpendicular to tunnel axis in the construction was studied with FLAC and field monitoring. When in shield construction, different construction parameter, different tunnels distance and other factors have different deformation effect on pipeline. When in tunneling construction, different pipe tunnel distance has different deformation effect on pipeline. According to the different construction method, the protection measures of pipeline are given. (6) Based on the grade division which established on deformation effect of underground pipeline in constructing metro tunnel, the theory of control technology and the results showed that different construction method has different effect on the deformation of underground pipeline; the deformation trend of the drainage pipe of reinforced concrete between the two axis tunnels is predicted by using of FLAC in shield construction of Tong-Hu interval in Xi'an metro Line 3, and drew up the pilot monitoring program and protection measures. Meanwhile, the deformation effects of near pipeline in excavation method construction have been simulated with FLAC, the deformation trend of pipeline which crossing the ground fissure after construction is predicted, and this paper puts forward a measures of construction technology when the subway tunnel is down-traversing f4 ground fissure, put forward technical measures for protecting adjacent pipeline in subway tunnel excavation. The project practice shows that the proposed theory and control measures are reasonable and effective.