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针对长江漫滩地区特殊条件,通过收集南京青奥轴线——梅子洲过江通道两种不同地下连续墙作为围护结构的深基坑工程实测数据,从统计学角度对比分析了格栅地下连续墙和普通地下连续墙受力变形特性,研究了地下连续墙顶水平位移、墙体深层侧向位移、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;2两种墙体侧向位移随深度均呈“胀肚型”变化趋势,两者最大侧移均发生在埋深中部区域;3格栅地下连续墙在基坑开挖初期,受支撑设置影响,地表先小幅隆起,普通地下连续墙无隆起现象,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。
According to the special conditions of the Yangtze River floodplain area, by collecting the measured data of deep foundation pit with two different underground continuous walls of Nanjing Qing’ao Axis - Meizuzhou Corridor, this paper compares the underground continuous Wall and ordinary underground continuous wall, the horizontal displacement of underground continuous wall, the lateral lateral displacement of the wall, the settlement of ground surface, the axial force of supporting shaft and the variation with excavation and time of foundation pit are studied. The main conclusions are as follows: 1 The horizontal displacement of the wall top has a tendency of rebound deformation after the support is set, the deformation is supported and erected, the pre-added axial force and the demolition are greatly affected. 2 The lateral displacements of the two kinds of walls show “ Belly ”trend, both the maximum lateral displacement occurred in the middle of the buried depth; 3 grille underground diaphragm wall in the early excavation, affected by the support set, the surface of the first slightly uplift, no ordinary underground diaphragm wall uplift phenomenon , And the settlement is obviously larger. The settlement of the two subsides gradually decreases with the increase of the distance from the wall, and the differential settlement at different distances increases in the late excavation.