软土地区基坑工程变形及轴力监测研究

Study on Deformation and Axial Force Monitoring of Foundation Pit Engineering in Soft Soil Area

文中结合某建筑工程施工实践,对基坑施工过程中的变形及应力响应进行监测,分析基坑水平位移、竖向位移、支撑轴力以及沉降量的变化规律。结果表明,地下连续墙相同深度位置的水平位移随开挖深度的增加而不断增加;地下连续墙的水平位移随着深度的降低先略微增加后降低,且反弯点出现的位置随着开挖深度的增加而增加。围护结构的竖向位移随着时间的增加表现为先稳定再快速下降后再次平稳的规律,当开挖至基坑底部时,围护结构的竖向位移稳定在22 mm;第二根支撑ZL1-3的轴力最大,达到了1500 kN。基坑周边地面沉降量随着支撑施工深度的增加表现为不断增加的规律,当底板施工完成后,基坑周边地面的最大沉降量为31.5 mm。

Based on the construction practice of a building project,this paper monitors the deformation and stress response during the construction of foundation pit,and analyzes the changing rules of horizontal displacement,vertical displacement,supporting axial force and settlement of foundation pit.Through practice,the horizontal displacement of diaphragm wall at the same depth increases with the increase of excavation depth.The horizontal displacement of the diaphragm wall increases slightly at first and then decreases with the decrease of the depth of the wall,and the position of the reverse bending point increases with the increase of the excavation depth.With the increase of time,the vertical displacement of the enclosure structure is stable at first and then stable again after a rapid decline.When the excavation reaches the bottom of the foundation pit,the vertical displacement of the enclosure structure is stable at 22 mm.The second support ZL1-3 has the highest axial force,reaching 1500 kN.The ground settlement around the foundation pit increases with the increase of the support construction depth.When the construction of the bottom plate is completed,the maximum ground settlement around the foundation pit is 31.5 mm.