秦望广场塔楼沉降后浇带提前封闭技术研究

Study on Advance Sealing Technology of Post-poured Zone for Tower Building Settlement in Qinwang Square

研究目的:带超高层物业开发的大型地下综合体,为了不影响裙房和地下室提前投入使用,需要研究超高层建筑沉降后浇带提前封闭可行性,通过杭州富阳秦望广场通道工程实际项目,采用有限元整体建模分析,提出了残余沉降差计算方法,利用试桩静载试验P-S曲线确定了桩基线刚度参数,推导出沉降后浇带提前封闭楼层,通过实际监测数据,对理论计算结果进行对比验证。研究结论:(1)试桩线刚度与单桩承载力特征值比值在76~119之间,与传统经验值100倍单桩承载力特征值相比,试桩结果离散性较大;(2)塔楼总沉降量与楼层数关系不大,与桩基线刚度取值关系较大;(3)塔楼桩基采用相同线刚度,楼层数与总沉降量成正比;(4)塔楼沉降呈线性发展趋势,理论计算与监测数据基本一致,因成桩工艺控制不稳定,导致工程桩线刚度有离散性,理论计算沉降速率与监测相比均偏小,导致后浇带提前封闭楼层判断有误差;(5)本研究成果可为超高层建筑提前封闭沉降后浇带设计提供参考。

Research purposes:For the large underground complex with super-high-rise property development,the feasibility of pre-sealing the post-poured zone of super-high-rise building settlement was studied in order not to affect the pre-operation of the podium and basement.Based on the practical project of Qinwang Square passageway in Fuyang District,Hangzhou,the calculation method of residual settlement difference was proposed by means of finite element integral modeling analysis,the calculation results were compared and verified by the actual monitoring data.Research conclusions:(1)The ratio of linear stiffness of test pile to the characteristic value of single pile bearing capacity is between 76 and 119.Compared with the characteristic value of single pile bearing capacity of 100 times of the traditional experience value,the test results are more discrete.(2)The total settlement of the tower has little relation to the number of floors,but has great relation to the stiffness of the pile foundation.(3)The pile foundation of the tower building adopts the same linear stiffness,and the number of floors is directly proportional to the total settlement.(4)The settlement of the tower building presents a linear development trend,and the theoretical calculation and monitoring data are basically consistent,because of the instability of the pile-forming process control,as a result,the stiffness of the pile line is discrete,and the settlement rate of the theoretical calculation is smaller than that of the monitoring.(5)The results of this study can provide reference for the design of pre-closing settlement post-pouring zone of super high-rise building.