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针对长江漫滩高承压水地基,以南京青奥轴线—梅子洲过江通道基坑为依托工程,开展格栅地连墙和普通地连墙承载特性的现场试验研究,分别测试研究其墙顶水平位移、墙体深层水平位移、地表沉降、支撑轴力等随基坑开挖及时间的变化规律。主要结论如下:(1)墙顶水平位移在支撑设置后均有回弹变形趋势,变形受支撑架设、预加轴力及拆除影响较大;(2)2种墙体深层水平位移随深度均呈“胀肚型”变化趋势,两者最大侧移均发生在埋深中上部区域;(3)格栅地连墙在基坑开挖初期,地表先小幅隆起,普通地连墙无隆起现象,且沉降明显偏大,两者随距墙体距离增大沉降逐步变小,且不同距离处差异沉降在基坑开挖后期均有增大趋势。
Based on the Yangtze River floodplain high pressure water foundation and Nanjing Yan’ao axis-Mezizhou river crossing excavation as its support project, field tests on the load-bearing characteristics of the grid-connected wall and the common geosynthetic wall were carried out to test the wall. The horizontal displacement of the roof, the horizontal displacement of the deep wall, the settlement of the surface, the axial force of the support, etc., vary with the excavation and time of the foundation pit. The main conclusions are as follows: (1) The horizontal displacement of the wall top has the tendency of springback deformation after the support is set, and the deformation is greatly influenced by the support erection, pre-axial force and dismantlement; (2) The depth horizontal displacements of the two kinds of walls are The trend of change is “expansion of belly type”. The maximum lateral displacement of both occurs in the middle and upper part of the burial depth. (3) In the initial stage of excavation of the foundation pit, the surface of the grid is slightly raised first, and the ordinary wall is not The uplift phenomenon, and the settlement is significantly larger, the two gradually decrease with the increase in distance from the wall, and the differential settlement at different distances tends to increase during the excavation of the foundation pit.