深基坑開挖與臨近既有城際鐵路的相互影響研究
[Abstract]:With the rapid development of high-speed inter-city railway construction in China and the large-scale construction of foundation pit engineering, the problem of interaction between excavation and adjacent intercity railway lines is inevitable in the engineering construction. In this paper, based on the foundation pit project of Xiaohong Mountain passenger Station near the city of Shanghai and Nanjing, the static and dynamic analysis models are established by using the large-scale finite element software ABAQUS, and the interaction between the excavation of deep foundation pit and the inter-city railway is studied. The main research contents and results are as follows: (1) according to the actual conditions of foundation pit engineering in Xiaohong Mountain passenger Station, the finite element model is established. The characteristics of double-row pile supporting structure under excavation and dynamic load of foundation pit and the dynamic response of roadbed are analyzed, and the calculated results are compared with the measured data of foundation pit engineering. The validity of the model is verified. (2) the internal force, horizontal displacement and surface deformation of the support structure under different train speeds are compared and analyzed. (2) the internal force, horizontal displacement and surface deformation of the support structure with the speed of 150 km / h are compared and analyzed. The results show that the bending moment of the double-row pile increases obviously with the increase of the speed of the train, and the value of the bending moment of the double-row pile is obviously increased with the increase of the speed of the train. The horizontal displacement, ground subsidence and uplift of double-row piles are slightly increased. (3) through the analysis of bending moment, horizontal displacement and surface uplift of double-row piles at different distances between inter-city railway and foundation pit, When the distance between them is within 4 times of the depth of foundation pit, the influence of inter-city railway on the supporting structure of foundation pit should be considered in the design of supporting structure. The dynamic response characteristics of roadbed in x direction and y direction show that using double row pile support and soil reinforcement in passive zone can significantly reduce the lateral displacement of subgrade caused by excavation of foundation pit, compared with only adopting double row pile support. (5) the characteristics of subgrade deformation, vibration and dynamic stress under different excavation depth are compared and analyzed. The results show that the influence of excavation depth on subgrade is mainly reflected in increasing the horizontal lateral displacement of subgrade. Vertical settlement, differential settlement of subgrade and increase of tensile stress in X direction of the surface layer of foundation bed.
【學位授予單位】:南京大學
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:TU473.2;U212.22
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