深层搅拌桩技术在天井湖节制闸软土地基处理中的应用

天井湖节制闸系淮河流域治理工程之一．闸基为全新世沉积软土，主要持力层天然含水量平均值为46％，允许承载力最小为55kPa，。程地质条件甚差．经多方案比选，采用深层搅拌桩（粉喷）进行闸基加固．本文全面介绍了该闸设计中水泥掺入比、桩长、置换率等参数的选择；水泥土各项强度参数（无侧限抗压强度、变形模量、抗剪强度）试验结果；闸址搅拌桩复合地基承载力、抗滑稳定和沉降量等定量分析计算．施工后经现场检测，除路堤段由于侧向未处理堤段沉降过大的影响，出现少量不均匀沉降外，主体建筑变形均未超过设计计算值．

Application of Deep Mixing Method for Strengthening Soft Clay Ground of Sluice

The lake, Tianjng sluice, is one of the Huaihe river improvement projects. The sluice foundation soil is Holocene soft clay, major carrying loading Stratum has 46% natural water content, has allowance carrying capacity f_(sk)=55 kPa. The engineering geologic condition of the sluice site is worse. It was to be used by the powder deep mixing method. The paper shows the parameters selection for the incorporation rate of cement-soils length of piles and replacement ratio; Shows that all strength parameters (unconfined compression strength, modulus of deformation and shear strength) of cement-soil tube test information; Shows the quantitative analysis calculation about the bearing capacity, the safety factor against sliding and the depression value for composite foundation of the sluice site, The sluice was established and operated.