预应力混凝土竹节桩沉桩施工对周边建筑物的影响分析

Impact Analysis of Prestressed Concrete Bamboo Pile-sinking Construction on Surrounding Buildings

预应力混凝土桩基沉桩施工会造起挤土效应,引起周边地表和建筑物发生隆起变形,严重的会造成建筑物破坏,影响正常使用。结合台州S1线温岭16工区预应力混凝土竹节桩复合地基沉桩工程,对现场建筑物沉降监测数据进行分析,结果表明:滨海软黏土地区预应力混凝土竹节桩沉桩施工时,对桩周土体扰动程度较管桩偏大;离沉桩位置越近的建筑物隆起变形越大,桩长对变形影响明显;沉桩距离超过桩长3倍时,对建筑物几乎没有任何影响;沉桩距离在桩长3倍以内时,通过合理控制沉桩顺序和施工速度,做好建筑物沉降监测,可以有效降低对建筑物的影响。同时提出,围绕多因素耦合作用进行沉桩施工对周边环境的影响研究势在必行。

The pile-sinking construction of prestressed concrete pile foundation will cause soil squeezing effect,which may cause the uplift deformation of the surrounding ground and buildings,and seriously damage the buildings and affect the normal use.Combined with the pile-sinking project of prestressed concrete bamboo pile composite foundation in Wenling 16 working area of Taizhou S1 line,the on-site building settlement monitoring data are analyzed.The results shows that,in the coastal soft clay area,the disturbance degree of soil around the pile caused by the construction of prestressed concrete bamboo pile is greater than that of pipe pile;the closer to the pile-sinking position,the greater the uplift deformation of the building,and the pile length has an obvious effect on the deformation;when the pile driving distance is more than three times of the pile length,there is almost no impact on the building;when the pile-sinking distance is less than 3 times of the pile length,the impact on buildings can be effectively reduced by reasonably controlling the pile-sinking sequence and construction speed and it can effectively reduce the impact on buildings.At the same time,it is imperative to study the impact of pile-sinking construction on the surrounding environment around the coupling effect of multiple factors.