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A Study on the Ground and Building Settlement Caused by Shield Tunnelling in a Peat Soil Stratum
(1 MOE Key Laboratory of Transportation Tunnel Engineering, Southwest Jiaotong University, Chengdu 610031; 2 Department of Civil Engineering, Southwest Jiaotong University, Chengdu 610031; 3 The 2nd Engineering Co. Ltd. of China Railway Construction Bridge Engineering Bureau Group, Shenzhen 518083)
Abstract In this paper, using the Kunming Metro as an example, the effects of shield tunnelling in a peat soil stratum on ground and building settlement are studied using a numerical simulation method. The results show that: 1) advanced compression and settlement of the peat soil are induced by the construction load; 2) the influence range of ground heaving in the longitudinal direction is nearly 2~3 times the tunnel diameter, while the influence range of settlement in the horizontal direction is nearly 7 times the tunnel diameter, with maximum settlement occurring in previously constructed tunnels; 3) the ground settlement becomes stable 30 m behind the excavation face; and 4) ground and building settlement is mainly induced by previously constructed tunnels, within a range of 20 m on both sides of the tunnel axis, which leads to the building inclination and tensile failure of the substructure. Therefore, countermeasures should be adopted to reduce such building damage according to ground deformation laws and the relative position of buildings and previously constructed tunnels. The ground and building settlement laws are verified by field test data.
Abstract：
In this paper, using the Kunming Metro as an example, the effects of shield tunnelling in a peat soil stratum on ground and building settlement are studied using a numerical simulation method. The results show that: 1) advanced compression and settlement of the peat soil are induced by the construction load; 2) the influence range of ground heaving in the longitudinal direction is nearly 2~3 times the tunnel diameter, while the influence range of settlement in the horizontal direction is nearly 7 times the tunnel diameter, with maximum settlement occurring in previously constructed tunnels; 3) the ground settlement becomes stable 30 m behind the excavation face; and 4) ground and building settlement is mainly induced by previously constructed tunnels, within a range of 20 m on both sides of the tunnel axis, which leads to the building inclination and tensile failure of the substructure. Therefore, countermeasures should be adopted to reduce such building damage according to ground deformation laws and the relative position of buildings and previously constructed tunnels. The ground and building settlement laws are verified by field test data.
ZHOU Jia-Mei-1,
2 ,
MENG Guo-Wang-1 etc
.A Study on the Ground and Building Settlement Caused by Shield Tunnelling in a Peat Soil Stratum[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(3): 160-167
2015, Vol. 52 