中小直径盾构施工隧道特性研究

发布时间：2018-05-17 12:53

本文选题：中小直径盾构隧道 + 土层沉降　；参考：《华南理工大学》2014年硕士论文

【摘要】：随着城市电力需求的快速增长，供电负荷越来越高，线路愈加密集，中小直径电缆隧道已经逐步显现出了取代传统架空线路的趋势，是我国未来城市发展的方向。目前，国内采用盾构法施工的隧道越来越多。对于一般直径盾构所产生的地面沉降规律和土体扰动规律以及影响范围，国内外己有不少这方面的研究，但针对中小直径盾构的研究很少。本文通过现场原位试验，对中小直径盾构隧道施工过程中所引起的土体分层沉降、深层水平位移、孔隙水压力、隧道管片应力进行了监测，分析了中小直径盾构施工引起土层沉降、土体水平位移及土体孔隙水压力、管片轴向应力及环向应力的变化规律。分析对比了中小直径与一般直径盾构隧道开挖引起的土体变形实测值，结果表明，中小直径隧道盾构法施工对土体产生的扰动规律与一般直径隧道类似，扰动产生的位移与受扰动的土层有很大关系。本文利用MIDAS有限元软件建立计算模型，模拟了中小直径盾构隧道开挖引起的土体变形，，分析了现场监测所得数据与数值模拟计算结果存在差异的原因。根据中小直径与一般直径盾构隧道变形的数值模拟对比，进一步分析了二种直径盾构隧道土体变形的特征。
[Abstract]:With the rapid growth of the urban power demand, the power supply load is getting higher and the line is more dense. The medium and small diameter cable tunnel has gradually shown the trend of replacing the traditional overhead lines. It is the direction of the future urban development in our country. At present, more and more tunnels are used by the shield method in China. There are many researches in this field both at home and abroad, but there are few researches on small and medium diameter shield.
In this paper, the soil stratified settlement, deep horizontal displacement, pore water pressure and tunnel stress are monitored during the construction of medium and small diameter shield tunnel, and the settlement of soil layer, the horizontal displacement of soil and the pore water pressure of soil, the axial stress and circumferential stress of the segment are analyzed. The law of the change of force.
The measured values of soil deformation caused by middle and small diameter and general diameter shield tunnel excavation are compared and compared. The results show that the disturbance law of the shield method in medium and small diameter tunnel construction is similar to that of the general diameter tunnel, and the displacement caused by the disturbance is closely related to the disturbed soil layer.
In this paper, the calculation model of MIDAS finite element software is used to simulate the soil deformation caused by the excavation of the medium and small diameter shield tunnel. The reasons for the difference between the field monitoring data and the numerical simulation results are analyzed. According to the numerical simulation comparison of the deformation of the shield tunnel with the small diameter and the general diameter, the two diameters are further analyzed. The characteristics of soil deformation of shield tunnel.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43

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