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为了研究复合土钉支护基坑变形规律以及结构内力变化,以长沙高新区公安分局办公楼深基坑工程为基础,运用PLAXIS有限元程序对基坑开挖支护过程进行数值模拟分析,并与实测数据相对比,结果表明:1PLAXIS有限元程序能有效模拟基坑开挖支护过程,可用于对实际工程的基坑变形和结构内力变化的预测;2坑壁位移的曲线分布大致呈“鼓肚子”状,基坑周围地表最大沉降发生在距坑壁一定距离处,而不是坑壁附近。基坑底的隆起量在坑壁处最小,在基坑中心处最大;3锚杆锚固段轴力随开挖深度的增大而增大,沿长度方向减小,土钉轴力分布呈现“中间大,两头小”的特征。
In order to study the deformation law of the composite soil nailing foundation pit and the change of the internal force of the structure, based on the deep foundation pit project of the Public Security Bureau office building in Changsha High-tech Zone, the finite element program of PLAXIS was used to simulate the excavation and support of the foundation pit. Compared with the measured data, the results show that: 1PLAXIS finite element program can effectively simulate the process of foundation pit excavation and support, which can be used to predict the deformation of foundation pit and the change of internal force of the structure. The curve distribution of pit wall displacement is approximately “Drum” shape, the largest surface subsidence around the foundation pit occurred at a distance from the pit wall, not near the pit wall. The amount of bulge at the bottom of the foundation pit is the smallest at the pit wall and the largest at the center of the foundation pit. The axial force of the anchorage section of 3 bolts increases with the excavation depth and decreases along the length direction, “Middle large, two small” features.