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Analysis of Effects of Existing Adjacent Tunnels on Excavation

Author: DuDongGe
Tutor: WuShuGuang
School: Chongqing University
Course: Civil Engineering
Keywords: Deep foundation pit excavating Tunnel Monitoring FLAC3D
CLC: TU753
Type: Master's thesis
Year: 2011
Downloads: 136
Quote: 2
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Abstract


With the accelerating process of urbanization in China,limited land resources in the city have already been far from satisfying people’s needs, following by large-scale construction of high-rise buildings and underground works; at the meanwhile, more and more urban try to improve the traffic condition by building light rail, making it the symbol of modernization. Thus, in dense urban areas,it is inevitable that the deep foundation pit would be adjacent to existing light rail. The deep foundation pit engineering in this special condition has increasingly become a common research subject of great significance.Most of the Reference literatures are concerned with research on effects of excavation on existing adjacent tunnels, while few on effects of existing adjacent tunnels on excavation. Based on the deep foundation pit engineering in the Jiefangbei Guotai Square of Yuzhong District, Chongqing City, by making analysis of numerical and on-site monitoring results, Recommended calculation method is proposed, and reasonable proposals are put forward on design and construction of the supporting structure of similar deep excavating engineering. Main job is as follows:①A detailed introduction is made on common methods of deep foundation pit bracing structure, and according to beam on elastic foundation (BOEF) method, the stress and deformation of pit bracing structure without adjacent tunnels is calculated by utilizing the geotechnical software“Lizheng Deep Foundation Pit F-spw5”. The calculation consequences are prepared for design reference and making contrast with on-site monitoring and numerical result;②A three-dimensional finite difference numerical model of the excavation adjacent to tunnel is built with FLAC3D, which simulates the whole excavation process of the pit with top overload;③Many instruments like reinforced meter, surveying slant tube, soil pressure gauge and electronic tachometer are employed in the long-term on-site monitoring to survey the internal force and displacement variation of the pit retaining structure;④The internal force, displacement and soil stress variation are analyzed during the excavation, and an exploration is made for how to make the pit supporting more effective in the premise that the adjacent tunnel are safe. In the study, the rule reflected by numerical and monitored results are in substantial agreement, which is elaborated by theoretical calculation result. The thesis could also provide reference for optimal design, construction and relative specifications revision of anchor rod retaining wall in filling area.

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CLC: > Industrial Technology > Building Science > Construction > The project and the type of work > Foundation engineering
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