地連墻基坑開挖中滲流作用對基坑變形的影響
[Abstract]:As the scale of the building is becoming larger and larger, the deep foundation pit works continuously, and the depth of the foundation pit is increasing, so that the deformation of the foundation pit becomes the most important safety index of the foundation pit support. In the various supporting schemes of the foundation pit, the ground connection wall is widely used because of the large rigidity, small deformation, good safety and security, and can be combined with the reverse construction as the structure of the main body, and the research on the deformation of the foundation pit of the ground connection wall is also increased. However, the seepage of groundwater is one of the main factors that affect the deformation of the foundation pit, and the related research is relatively scarce, especially the research on the separate separation of the pore water of the soil. In this paper, the precipitation process of the foundation pit is simulated by the finite element simulation method, and the effect of the seepage of the soil pore water on the deformation of the foundation pit is studied through the study of the deformation of the foundation pit before and after the precipitation analysis step. The main contents of the research are as follows: (1) The process of selecting and analyzing the parameters of the finite element model is introduced, and the excavation process of the whole foundation pit is divided into two analysis steps of precipitation and excavation to distinguish the deformation of the foundation pit caused by two different processes. The simulation results are compared with the measured results to verify the applicability of a foundation pit engineering case by using the described simulation method. (2) A baseline model used as a reference standard was established prior to the study of the impact of the factors. The finite element simulation results of the reference model are analyzed, and the deformation and the characteristics of the foundation pit are described in detail. The lateral deformation of the ground connecting wall, the settlement of the soil mass outside the foundation pit and the base uplift are used as the comparison items of the deformation of the foundation pit, and the specific gravity of the deformation of the foundation pit caused by the precipitation process in the total deformation is analyzed. (3) To change the depth of the ground connection of the wall, compare the deformation and analysis results of the foundation pit with various depth, and obtain the effect of the length of the earth-connecting wall on the deformation of the foundation pit and the size of the seepage. The permeability coefficient, the ratio of porosity and the rebound index of the soil body are changed, and the proportion of the deformation of the foundation pit and the deformation of the precipitation process is also analyzed, and the influence of the soil parameters on the deformation and seepage effect of the foundation pit is studied. (4) Two measures to reduce the influence of seepage: the ground connection wall is embedded in the bedrock, and the dewatering well is set on the periphery of the foundation pit. The finite element simulation of the two measures, except that the relevant parameters of the measures differ in the finite element model, the other parameters are the same as the comparison model, and the simulation results are compared with the results of the reference model to obtain the effect of the two measures.
【學(xué)位授予單位】:東南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TU753
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