室内固结试验每级荷载合理受压时间分析  

Reasonable loading time for each stage of loading in consolidation tests

作　　者：张海霞[1] 李晖[2] 陈勇 

机构地区：[1]河海大学土木工程学院,江苏南京210098 [2]河海大学教务处,江苏南京210098 [3]南京市水利规划设计院,江苏南京210005

出　　处：《河海大学学报（自然科学版）》2004年第1期81-83,共3页Journal of Hohai University(Natural Sciences)

摘　　要：采用固结试验得到的压缩性指标计算土体固结沉降量.研究表明,室内24h加压的大部分时间产生的沉降为次固结沉降,固结沉降在1～4h之内已经完成.为了较准确地计算固结沉降量,建议将固结试验每级荷载加压时间由土工试验规范中规定的24h缩短成:固结系数大于4×10-4cm2/s的粘土和粉质粘土为1h,固结系数在1×10-4～4×10-4cm2/s范围内的粘土为4h.The consolidation settlement of foundations is calculated with the compression index (or compressibility coefficient). According to the geotechnical specifications for consolidation tests in China, the loading of each stage should last 24 hours, but the research shows that the consolidation settlement has been finished in the early 1～4 hours for most clay, and during the rest of time, the settlement belongs to the secondary consolidation settlement. For accurate calculation of the consolidation settlement, it is suggested that the loading time of each stage should be reduced, i.e. 1 hour for clay and silty clay with a consolidation coefficient larger than 4×10^(-4)?cm^2/s, and 4 hours for clay with a consolidation coefficient in the range of 1×10^(-4)?cm^2/s ～ 4×10^(-4)?cm^2/s.

关 键 词：室内固结试验 荷载 压缩性 土体 次固结系数 

分 类 号：TU411.5[建筑科学—岩土工程]