滨江软土地层逆作法深基坑变形及控制研究

以某滨江软土地层逆作法深基坑为依托,利用有限差分软件对该基坑进行了数值仿真,结合监测数据对不同开挖深度下地连墙、内支撑轴力及基坑外土体沉降的变化规律进行了较为系统的研究。逆作法基坑地连墙的水平变形随开挖深度近似呈"弧形"分布,水平位移最大值出现的位置在基坑开挖面底部,与顺作基坑的变形规律区别较大;基坑开挖影响范围较大,距离基坑开挖深度2倍的地表也能受到基坑开挖的影响,地表监测点的沉降趋势及沉降曲线形态类似;该模拟方法及变形监测所得规律可以为类似基坑工程提供科学指导和理论依据。

Study on Deformation Law and Control of Excavations with Top-down Method in Riverside Soft Soil

Based on the excavations with top-down method in a riverside soft soil,the finite difference software is used to simulate and analyze the reverse foundation pit,and the variation law is studied with monitoring data from the aspects of diaphragm wall,internal support axial force and soil settlement outside the foundation pit under different excavation depth.The horizontal deformation of diaphragm wall of the excavations is approximately "arc"distributed with excavation depth,and the maximum horizontal displacement occurs at the bottom of excavation face,which is quite different from the rule of consecutive excavation method;the influence range of excavations is large,and the surface twice as deep as that of excavations can also be affected by construction progress,the change trend of surface monitoring points is the most significant.The shape of final settlement curve is similar,which increases gradually with the depth of excavation and tends to be stable after a certain stage.The numerical simulation method can provide scientific guidance and theoretical basis for similar excavations.