砂性土基坑變形特征
[Abstract]:Since the reform and opening up, China's rapid economic development, the scale of urbanization is becoming larger and larger. The coastal city depends on its unique geographical advantage and comfortable living environment, making it the preferred area of population concentration. The concentration of population leads to more and more shortage of urban space. Making full use of underground space to perfect urban infrastructure has become an indispensable part of urban construction. In the process of urban construction, a large number of complex deep foundation pit projects have emerged one after another. As an important feature of engineering geology in coastal city, sand soil foundation is often encountered in coastal city foundation pit engineering. The study on deformation characteristics of foundation pit in sandy soil foundation is of great significance for future engineering construction in coastal cities. This paper closely combined with engineering examples, taking the excavation engineering of Tianli three-star hotel and hotel-style apartment and office building in Haikou City, Hexin Square Foundation Pit Project and Meihe District Foundation Pit Project as examples, carries on the spot monitoring in the foundation pit construction process. The deformation characteristics of sand soil foundation pit are summarized, and the three-dimensional finite element simulation of the retaining structure of the foundation pit in Meihe district is carried out. The simulation results are compared with the monitoring results. The research contents and main achievements are as follows: (1) this paper summarizes the deformation characteristics of foundation pit engineering summarized by predecessors. In sandy soil foundation pit, the deformation caused by foundation pit excavation mainly includes deformation and displacement of supporting structure. The settlement and displacement of the soil in the back of the supporting structure, the springback and uplift of the soil at the bottom of the foundation pit and the change of the groundwater level. (2) in the sand soil foundation pit supported by piles, the horizontal displacement of the top of the supporting structure is of medium span and large. The vertical displacement has little change on both sides, and the main influence range on the surrounding environment is within 1.5 times of the depth of foundation pit. (3) in the sandy soil foundation pit excavated by slope, the horizontal displacement deformation of the slope top is more uniform. The vertical displacement varies greatly and the main influence range on the surrounding environment is within 2 times of the depth of the foundation pit. (4) the three-dimensional model of the retaining structure of the foundation pit in Meihe district is established, and the deformation characteristics of the simulation are similar to the measured deformation characteristics.
【學位授予單位】:海南大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TU441;TU433
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