Abstract
In order to study the deformation of a diaphragm wall and the settlement of surrounding soil under the complicated conditions of the deep and soft soil layer, which is underlying inclined rock and top-down construction method, the construction scheme of suspended diaphragm wall based on the engineering practice of Oujiang North Estuary deep and large foundation pit of Wenzhou S2 railway is proposed, and the research method of numerical simulation is adopted in this article. By using Midas GTS finite element software, a three-dimensional model of deep and large foundation pit excavation with top-down construction method is established, and the internal force, deformation, and surface settlement of surrounding soil of suspended diaphragm wall with different depths into rock (1 m, 2 m, and 4 m) are analyzed. Furthermore, the optimization simulation research on the anchor locking scheme is carried out for the determined footed diaphragm wall. Similarly, the anchor locking scheme at a depth of 1 m into the interface between soil and rock is selected as the supporting scheme of the footed diaphragm wall through the simulation results. The research results of this article can guarantee the safety of diaphragm wall construction of deep and large foundation pit in complex stratum.
Highlights
At present, deep foundation pit engineering is more and more widely applied, and the depth of foundation pit is becoming deeper and deeper
(1) When the foundation pit of hanging foot ground connecting wall is excavated by top-down construction method, the horizontal displacement curve of hanging foot ground connecting wall is in the shape of “small at both ends and large in the middle.”
With the excavation of the foundation pit, the position of the maximum horizontal displacement of the diaphragm wall gradually moves downward, and the maximum positive moment of the diaphragm wall is greater than the maximum negative moment. e maximum surface settlement is located 15 m away from the edge of the foundation pit, which is about 0.3 times the final excavation depth of the foundation pit. e horizontal displacement, bending moment and surface settlement of the hanging foot diaphragm wall decrease with the increase of the rock depth
Summary
Deep foundation pit engineering is more and more widely applied, and the depth of foundation pit is becoming deeper and deeper. The surrounding environment of the foundation pit is more complex, the geological conditions are worse, and the research on the construction of foundation pits in underlying strata is less; these factors bring great challenges to the safety of foundation pit construction In this context, based on the deep foundation pit engineering of Jiangbei working shaft of S2 line of Wenzhou City railway, using the three-dimensional finite element numerical simulation method, aiming at the underground continuous wall support, the soft soil layer of underlying inclined rock surface, and the top-down construction technology, this article makes a comprehensive study on the internal force and deformation effect of deep foundation pit suspended foot diaphragm wall construction. The numerical simulation method will be used to simulate the construction of the suspended footed diaphragm wall so as to determine the depth of the suspended footed diaphragm wall into the rock (1 m, 2 m, and 4 m) and the locking reinforcement scheme of the suspended footed diaphragm wall so as to provide a reference for the smooth progress of the project
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