【作者】 杨雄；

【导师】 何川；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2007， 硕士

【摘要】 盾构法隧道已广泛应用于城市地下铁道建设，城市建设中的大断面、高水压、长距离盾构掘进成为迫切需要解决的课题。论文以南京长江隧道φ14.5m的超大断面管片衬砌结构为对象，采用几何相似比C_L=25、容重相似比C_γ=1为基础相似比的室内相似模型试验和管片结构数值模拟为研究手段，研究不同管片拼装方式在不同水、土压作用下的力学特征及高水压条件下单层管片衬砌的破坏形态特征。模型试验研发了非均匀水压装置，水压加载考虑为隧道顶部的均匀水压、管片衬砌结构自身尺寸产生的非均匀水压的联合作用，实现了模型试验加载中水、土压的分别控制，为深入研究水、土压对管片衬砌的作用提供了重要支撑。本文主要研究的内容如下：(1)根据各控制工况提供的计算条件，对不同拼装方式下的管片衬砌结构进行数值模拟，得到控制设计的内力值和变形值，同时验证模型试验结果的准确性。(2)试验研究隧道顶部不同水压下管片衬砌结构的力学特征及变化规律。(3)试验研究不同覆土高度、不同侧压力系数的土压力对管片结构的作用，分析地层条件对管片衬砌结构的影响。(4)综合比较七种拼装方式下衬砌在各工况的力学特点，研究不同拼装方式管片衬砌的力学特征，选择出最优拼装方式。(5)在50m高水压条件下对管片衬砌结构进行加载破坏试验，获得计算模拟不能表征的破坏形态。更多还原

【Abstract】 Shield tunnel has been widely used in urban metro construction。Large scale section、high hydrostatic water pressure、long distant excavation of shield tunnel is becoming the problem that must be solved immediately. Based on the super large scale segment lining (φ14.5m) of Nanjing Changjiang Tunnel, numerical simulation and laboratorial model test taking geometric similarity ratio C_L=25 and bulk density similarity ratio C_γ=1 as the base is used as the research means to study the mechanical characteristic of the lining with different assembling plan under different water and soil pressure, the failure characteristic of the single lining working under high water pressure is also studied.Non-uniform water pressure device is exploited, which offer the key support to study home the water and soil pressure on segment lining, and actualize separate control of them.Main content of the dissertation are as follows:(1) Numerical simulation is carried out of the lining with different assembling plan according to the computational conditions, and the inner force, deformation which control the design is obtained, meanwhile the result of the model test is validated.(2) Mechanical characteristic and its changing laws of the segment lining under different hydrostatic water pressure is studied.(3) The reaction of the lining under soil pressure due to different cover depth of the stratum and lateral coefficient is studied, and the effect of different stratum circumstances to the lining is analyzed.(4) Mechanical characteristic of the lining with seven kinds of assembling plan under various working conditions is synthetically compared, and mechanical characteristic of the lining with different assembling plan is also studied, meanwhile the best assembling plan is chosen.(5) Failure test of the lining is done under 50 meter high hydrostatic water pressure, and the failure characteristic is obtained which can’t be done by numerical simulation.更多还原