Abstract
Based on the soft-soil layer and several practical subway stations projects, the effect of partition wall main parameters on internal force and the deformation of retaining structure was thoroughly investigated via numerical simulation and orthogonal experiment. Results show that the influence of distance between partition wall and retaining structure, L, on controlling the internal forces of the retaining structure and maximum ground settlement, is more obvious; the maximum settlement can be reduced by more than 60%. Moreover, the influence of partition wall depth under the ground, H, within a certain range can substantially reduce the maximum lateral palisade structure; the lateral displacement can be reduced by about 50%; however, within the scope of the economic, the stiffness of the partition wall, E, with impact on retaining structure internal force and deformation is relatively weak. Finally, the applicability of the research results is verified.
Highlights
For a building with high-protection grade in the adjacent foundation pit, the distance between the foundation pit retaining structure and the protected object should be more than 1.2 ∼ 1.5 times the excavation depth of the foundation pit
If the minimum safe distance cannot be met and the stiffness of the envelope is already high, the tracking compensation method, foundation underpinning method, and partition method [15] are commonly used as protection measures. e tracking compensation method is one of them
It belongs to the “dynamic deformation control” category, and its main principle is to timely supplement ground loss through grouting during the foundation pit construction process to ensure that the construction technology and grouting time grasp requirements are high. e main principle of the foundation underpinning method is to improve the bearing capacity of the foundation by strengthening the soil beneath the foundation of the building before excavation to control the settlement of the building
Summary
For a building with high-protection grade in the adjacent foundation pit, the distance between the foundation pit retaining structure and the protected object should be more than 1.2 ∼ 1.5 times the excavation depth of the foundation pit. E tracking compensation method is one of them It belongs to the “dynamic deformation control” category, and its main principle is to timely supplement ground loss through grouting during the foundation pit construction process to ensure that the construction technology and grouting time grasp requirements are high. E range of plane setting is generally at least equal to the range of buildings requiring settlement control, and the range of vertical setting must generally pass through the possible slip surface It primarily constructs palisade structures and excavates lateral Earth pressure and friction resistance caused by differential settlement. In comparison to the previous two control measures, the construction speed is fast and the operation is simple
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