尺寸效应对吹填软土固结特性影响的试验研究  

Experimental Research on Size Effect Upon Consolidation Property of Hydraulic Reclamation Soft Clay

作　　者：雷华阳[1,2] 贺彩峰[2] 仇王维 陈丽[2] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2016年第1期73-79,共7页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(51378344)

摘　　要：利用改装后的固结仪,针对天津地区真空预压处理后的吹填软土,开展了一系列固结特性试验研究,着重研究了试样尺寸对吹填软土固结特性的影响.结果表明,不同尺寸试样的e-lg,p曲线均表现为结构较完整、结构破坏、趋于重塑土3个阶段;在同一等级荷载作用下,稳定应变随着试样高度的增加而线性减小;固结系数和次固结系数均随荷载先增大后减小,最后趋于稳定,固结系数的峰值随着试样尺寸的增大而减小,次固结系数的峰值则相反.基于试验结果建立了一维应变预测模型,模型考虑了尺寸效应,具有参数少、易确定的优点.Using the modified oedometer,a series of consolidation tests with samples of different sizes are performed on hydraulic reclamation soft clay in Tianjin to study the influence of size effect on the consolidation properties. The results show that the e-lg,p curves of samples with different sizes can be divided into three stages：structural integrity stage,structural failure stage,remoulded stage. Under the same loading levels,with the increase of sample size,the stable strain shows a linear decrease. The consolidation coefficient and secondary consolidation coefficient increase first,then decrease,and finally tend to be stable with the increase of load. With the increase of sample size,the maximum value of consolidation coefficient decreases, contrary to the maximum value of secondary consolidation coefficient. Based on the test results,a strain prediction model is proposed,which considers size effect,possesses fewer parameters,and is easy to determine.

关 键 词：吹填软土 尺寸效应 固结系数 次固结系数 应变预测模型 

分 类 号：TU47[建筑科学—结构工程]