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Analysis of Stratum Deformation Induced by Shield Construction Adjacent to an Existing Deep Foundation Pit
(1 Shanghai Marine Geological Exploration and Design Co. Ltd., Shanghai 200120; 2 School of Civil Engineering of Suzhou University of Science & Technology, Suzhou 215011; 3 Construction Quality Supervision Station of Xiangcheng District, Suzhou 215131)
Abstract In light of the construction of a shield tunnel adjacent to an existing deep foundation pit, a scaled model test is conducted and a 3D FEM calculation model is established regarding the combined functions of the tunnel,soil mass and enclosure of the deep foundation pit. Based on a comparison of an indoor model test and numerical calculation results, the feasibility and reliability of the 3D numerical analysis is verified; the distribution characteristics and variation law of the surrounding surface settlements induced by shield tunnel construction adjacent to an existing deep foundation pit are obtained; shield tunnel construction induced displacement characteristics of the stratum of cross sections at different depths, the surface settlement distribution affected by the adjacent existing foundation pit, and the law of settlement varying with shield tunnel driving are analyzed; the displacement of the foundation pit enclosure affected by the shield tunnel is determined; and real-time monitoring is suggested for the surface settlement, stratum deformation and displacement and deformation of the foundation pit enclosure during shield tunnel construction.
Abstract：
In light of the construction of a shield tunnel adjacent to an existing deep foundation pit, a scaled model test is conducted and a 3D FEM calculation model is established regarding the combined functions of the tunnel,soil mass and enclosure of the deep foundation pit. Based on a comparison of an indoor model test and numerical calculation results, the feasibility and reliability of the 3D numerical analysis is verified; the distribution characteristics and variation law of the surrounding surface settlements induced by shield tunnel construction adjacent to an existing deep foundation pit are obtained; shield tunnel construction induced displacement characteristics of the stratum of cross sections at different depths, the surface settlement distribution affected by the adjacent existing foundation pit, and the law of settlement varying with shield tunnel driving are analyzed; the displacement of the foundation pit enclosure affected by the shield tunnel is determined; and real-time monitoring is suggested for the surface settlement, stratum deformation and displacement and deformation of the foundation pit enclosure during shield tunnel construction.
.Analysis of Stratum Deformation Induced by Shield Construction Adjacent to an Existing Deep Foundation Pit[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(2): 114-120
2017, Vol. 54 