孔内深层超强夯工法在湿陷性黄土地区高层建筑地基处理中的应用

为探讨孔内深层超强夯(SDDC)工法在湿陷性黄土地区的应用效果,采用SDDC工法的大直径挤密桩作为某高层建筑地基处理方法,进行复合地基承载力静载荷试验、桩体压实系数和桩间土挤密系数试验、桩身强度试验;依据试验数据指标,按桩身强度和复合地基承载力特征值双控的方法,确定复合地基承载力,并对建筑物在施工期间沉降和竣工后沉降观测数据进行搜集对比。试验结果表明,SDDC工法在湿陷性黄土地区高层建筑地基处理中消除地基湿陷、提高地基承载力、减小基础沉降、加快施工速度、提高施工质量和经济效益等方面具有明显优势,表明该方法在湿陷性黄土地区处理地基是有效可行的。

In order to explore the application effect of super down-hole dynamic consolidation(SDDC)method in collapsible loess area,the large diameter compaction pile of SDDC method was used as the foundation treatment method of a high-rise building,and the static load test of bearing capacity of composite foundation,the compaction coefficient of pile and the compaction coefficient of soil between piles and the strength of pile were carried out.According to the index of test data,the bearing capacity of composite foundation is determined according to the double control method of pile strength and the characteristic value of bearing capacity of composite foundation,and the observation data of building settlement during construction and after completion are collected and compared.The test results show that the SDDC method has obvious advantages in eliminating collapsibility foundation of collapsible loess area in the high-rise building foundation treatment,increasing the subgrade bearing capacity,decreasing the foundation settlement,speeding up the construction speed,and improving the construction quality and economic benefit,showing that the method in ground treatment of collapsible loess area is feasible and effective.