单样多级加荷法三轴UU试验对天津软土抗剪强度的影响  

Influence of triaxial UU test of single sample multistage loading method on shear strength of Tianjin soft soil

作　　者：石峥 陈雷[1] SHI Zheng;CHEN Lei(Tianjin Research Institute for Water Transport Engineering,Ministry of Transport,Tianjin 300456,China)

机构地区：[1]交通运输部天津水运工程科学研究所

出　　处：《水道港口》2019年第6期719-723,共5页Journal of Waterway and Harbor

基　　金：天津市自然科学基金(16JCQNJC07300);中央级科研院所基本科研业务费资助项目(TKS170225)

摘　　要：文章介绍了单试样多级加荷的三轴UU试验方法,以天津沿海地区饱和软黏土为研究对象,以常规多个试样的试验方法得出了强度指标作为标准,与单试样多级加荷的试验方法得出的强度指标进行比较和分析,并利用统计学原理,得出无论是用原状样还是重塑样,同一种试验方法,仪器对抗剪强度参数C值、Ф值的影响程度基本相同;单试样多级加荷的试验得出C值、Ф值偏大,而常规多个试样的试验方法更趋近于理论值。通过分析两种方法加荷、剪切等试验过程的不同点找出抗剪强度指标C值、Ф值差异的原因,为单试样多级加荷方法所提供抗剪强度值在工程实践中的可行性提供依据。The triaxial UU test method for single-sample multi-stage loading was introduced in this paper.By taking the saturated soft clay in Tianjin coastal area as the research object,using the strength index obtained by the conventional test method for multiple samples as the standard,the strength indicators obtained from the multi-stage loading test method were analyzed using the statistical principles.It is concluded that under the same test method,the effects of the instrument on the shear strength parameters C and Ф of both original and reshaped samples are basically the same.The single-sample multi-stage loading test results show that the C value and Ф value are higher,while the conventional test method for multiple samples is closer to the theoretical value.By analyzing the differences between the two methods of loading,shearing and other test processes,the reason for the difference in the shear strength index C value and Ф value was found out,which provides the basis for the feasibility of the shear strength value for the single sample multi-stage loading method in engineering practice.

关 键 词：三轴试验 不固结不排水剪 多级加荷 抗剪强度 

分 类 号：U656[交通运输工程—港口、海岸及近海工程]