超载预压法软基处理工后沉降预测分析  

POST-CONSTRUCTION SETTLEMENT'S FORECAST OF THE SOFT GROUNDS IMPROVED BY SURCHARGE

作　　者：陈曙光 但汉波[2] 顾素珍 

机构地区：[1]浙江二建建设集团有限公司第四分公司,浙江杭州310013 [2]浙江大学建筑工程学院,浙江杭州310027

出　　处：《低温建筑技术》2006年第2期87-89,共3页Low Temperature Architecture Technology

摘　　要：超载预压的工后沉降主要是土体的次固结变形,它通过减小次固结系数和推迟次固结发生来减少一定时间内软基的沉降。定义广义次固结系数综合描述卸载后土体的回弹和沉降过程,通过整理分析试验资料,分别得到了次固结系数、次固结延后时间与超载水平的函数关系,建议采用相应时段次固结系数平均值作为实际工后次固结沉降预测的计算参数。The post-construction setdement of the soft grounds improved by surcharging mostly is the secondary compression . A parameter named＂generalized coefficient of secondary compression＂ have been defined to describe the rebounding and consolidation process. Surcharge can decrease the coefficient of secondary compression and delay its occurrence, these two effects＇ functions with the surcharge loading are obtained separately according to some test results. It is suggested that the average of the coefficient of the secondary consolidation during special period of time can be used in the practical prediction of post-construction settlement.

关 键 词：超载预压法 工后沉降 有效超载比 

分 类 号：TU433[建筑科学—岩土工程]