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该文运用FLAC3D数值软件对保定平原地区某一深基坑变形规律进行模拟,并与理正计算数据、实测数据对比分析,结果表明:桩身位移、周围土体地表沉降FLAC数值模拟结果与实测值基本吻合;桩体最大水平位移值出现在基坑深度的1/2~2/3范围内,呈现“鼓肚子”现象,最大深层位移11.19mm;基坑周围地面沉降曲线为“抛物线”形式,沉降最大值为6.8mm,比实测值大34.6%,最大值距离坑边2~3m;锚杆最大轴力出现在第二排,土体变形较大的部位;预应力锚索对桩及土体的水平位移具有明显抑制作用;基坑支护设计方案合理,桩后土体位移满足规范要求;利用数值模拟计算对深基坑开挖进行预测计算是可行的,模拟结果可靠性较高。
In this paper, FLAC3D numerical software is used to simulate the deformation of a deep foundation pit in Baoding Plain. The results are compared with the calculated and measured data. The results show that the numerical simulation results of pile displacement, The maximum horizontal displacement of the pile appears in the range of 1/2 ~ 2/3 of the depth of the foundation pit, showing the phenomenon of “drum belly”, the maximum deep displacement is 11.19mm. The ground subsidence curve around the foundation pit is “ Parabola ”form, the maximum settlement of 6.8mm, 34.6% greater than the measured value, the maximum distance from the pit edge 2 ~ 3m; anchor axial force appears in the second row, soil deformation larger parts; prestressed anchor The horizontal displacement of piles and soil is obviously restrained. The design scheme of foundation pit is reasonable and the displacement of soil after piles meets the specification. It is feasible to predict the excavation of deep foundation pit by numerical simulation. The simulation results High reliability.