盾構隧道垂直下穿既有管線的擾動效應研究
[Abstract]:The influence of shield tunneling on the surrounding environment has become an important research topic, in which the influence of shield tunneling on the surrounding pipeline is particularly prominent. At present, there is still a weak link in the study of the influence of shield tunnel on the surrounding pipeline, and most of the studies only consider the influence of a single factor on the pipeline deformation. In this paper, sensitivity analysis of the main factors affecting pipeline displacement is carried out, which provides a reference for the design and construction of practical engineering. Based on the theory of elastic foundation beam, the deformation mechanism of stratum and pipeline caused by tunnel construction is discussed. The mechanical effect of rigid interface pipeline and flexible interface pipeline subjected to vertical perturbing disturbance of tunnel is analyzed, and the prediction method of pipeline deformation and force is put forward. By using FLAC3D finite difference numerical simulation combined with the measured results, the law of pipeline and surface subsidence in two-line tunnel construction is comprehensively analyzed: after the construction of the left tunnel, the lateral settlement trough and the displacement curve of the pipeline conform to Gao Si's distribution. The maximum settlement of pipeline and surface is directly above the center of left tunnel. After the excavation of the right-line tunnel, the main settlement range of the surface and pipeline becomes larger. The settlement characteristics of the surface approximately accord with Gao Si distribution, the settlement is larger than that of the left tunnel, the center settlement curve of the two tunnels is relatively gentle, and the maximum settlement changes between the two tunnels. The settlement of pipeline is "one peak and two valleys", which does not accord with Gao Si distribution, and the maximum settlement value of pipeline is close to the left tunnel. The influence of six main factors on pipeline settlement is studied by numerical simulation. With the increase of tunnel tunneling speed and tunnel diameter, the vertical displacement and maximum settlement of pipeline become larger with the depth of overburden of pipeline, tunnel tunneling rate and tunnel diameter. The vertical displacement and maximum settlement of the pipeline gradually decrease with the increase of the diameter of pipeline, the pressure ratio of excavated surface support and the distance between pipes and tunnels, and the main settlement range of pipeline increases with the increase of tunneling speed and diameter. The maximum settlement of pipeline is linearly related to the depth of overlying soil, the ratio of support pressure to excavating surface, and the diameter of tunnel. Taking the maximum settlement of pipeline as the index and adopting the method of grey correlation analysis, the influence sensitivity of each factor is compared and studied. The order of sensitivity to the influence of pipeline settlement from strong to weak is: tunnel diameter, tunnel spacing, pipeline diameter, and so on. Pipeline overlying depth, excavating surface support pressure ratio, tunneling rate.
【學位授予單位】:太原理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U455.43;TU990.3
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