深層回灌影響下中環(huán)高架長期變形分析
[Abstract]:As an important basic project in Shanghai, viaduct is the lifeblood of traffic network construction in Shanghai, and its safe operation is the cornerstone of urban development. However, due to the influence of land subsidence in Shanghai, the viaduct has been deformed. In order to ensure the normal operation of the viaduct, Shanghai has taken measures such as restricting the exploitation of groundwater and recharging the deep groundwater in order to reduce the land subsidence and its influence on the viaduct. Under the influence of deep groundwater recharge, the ground subsidence in Shanghai can be controlled, but at the same time, the deep soil mass has a certain uplift, and the bearing layer of the elevated pile foundation is deeper, which is more affected by the uplift and subsidence of the deep soil mass. In order to explore the long-term deformation characteristics of elevated pile foundation under the influence of deep recharge, this paper takes Shanghai Central elevated as the engineering background, and according to the long-term settlement monitoring results, The deformation characteristics of the central elevated Puxi section and its interaction with the ground subsidence are analyzed, and the effect of deep groundwater recharge on the long-term deformation characteristics of the central elevated pile foundation is studied by using the numerical simulation method. The main contents are as follows: (1) the different geological conditions in Puxi section of Shanghai Central Viaduct are systematically classified, and the monitoring data of long-term subsidence and adjacent land subsidence are combined. The interaction between the settlement of the central elevated pile foundation and the regional land subsidence is analyzed, and the influence of the geological structure on the settlement of the elevated pile foundation is studied. The results show that the settlement of ground and elevated pile foundation is the smallest in the normal sedimentary area, and the settlement of the ground and elevated pile foundation is the largest in the area with trace uplift and 6 missing layers. The deformation trend of elevated pile foundation is consistent with that of regional ground subsidence, and the settlement of elevated pile foundation is always smaller than that of ground settlement, and its deformation is most close to that of deep soil layer. (2) based on Biot consolidation theory, The fluid-solid coupling analysis method of groundwater flow control is used to simulate the process of deep groundwater pumping and irrigation, and the settlement characteristics of soil and pile foundation under seasonal variable discharge pumping and irrigation are analyzed numerically. The numerical analysis of typical pile foundation in the middle ring line is in good agreement with the test results, which proves that this method can effectively reflect the long-term influence of deep groundwater recharge on the deformation of the earth and the elevated ground. The numerical analysis shows that seasonal recharge causes the deformation of the elevated soil and soil to fluctuate with the season, the shallow soil is still consolidated and settled under the action of the surface load, and the deep soil is constantly uplifted. Under the coupling action of upper load and deep recharge, the vertical pile foundation presents the phenomenon of first settlement and then uplift, and its long-term settlement is more affected by the uplift displacement of deep soil layer. (3) the numerical analysis method verified by typical section test results is adopted. The main factors affecting the long-term deformation of elevated pile foundation are analyzed, and the effects of geological conditions, recharge point location, depth of recharge point, flow rate and pile foundation length on the settlement of the elevated pile and the earth are studied. This paper analyzes and summarizes the basic law that deep recharge load affects the deformation of elevated pile foundation: when the horizontal distance between the recharge point and the elevated pile foundation is smaller, the depth of recharge is deeper, the recharge flow is larger, and the bearing layer of pile foundation is deeper. The effect of recharge on the long-term deformation of the elevated pile foundation is also greater, and the settlement of the elevated pile foundation will be reduced under the action of recharge load and gradually lifted up.
【學位授予單位】:上海交通大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:U443.1
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