天津吹填软土的真三轴卸荷试验研究
摘要:利用刚柔复合型真三轴仪对天津吹填软土进行真三轴试验,针对基坑开挖侧向卸荷变形特性进行不固结不排水条件模拟试验研究,控制大主应力△σ1≈0、中主应变ε2≈0、小主应力方向卸荷。结果表明:侧向卸荷土体的初始卸荷模量随着围压的增大而增大,卸荷曲线ε1-ε3呈线性关系,泊松比与经典土力学相悖,μ31>0.5且卸荷剪切过程中随着围压的增大而变大,孔隙水压力在卸荷剪切过程中先增大后减小。
Abstract:In order to conduct the research on deformation properties of unloading of pit excavation,a series of true triaxial tests were performed in tianjin soft dredger fills under the condition of unconsolidated-undrained with rigid-flexible composite true triaxial apparatus, it keeps that major principle stress fixed and intermediate principal strain ε2≈0 and minor principle stress decreased. The results indicated that tangent compression modulus increases with increasing of compression stress, stress-strain relation ε1 and ε3 is linearity, poisson ratio is not match with classical soil mechanics theory,μ31>0.5 and increases with increasing of compression stress, pore water pressure increases at first then decreases.
中文标题：
天津吹填软土的真三轴卸荷试验研究
Study on Lateral Unlaoding of Tianjin Soft Dredger Soil by True Triaxial Text
作者：
王兔龙1,李佐良2,高雪咪3
Wang Tulong1,Li Zuoliang2,Gao Xuemi3
作者简介:王兔龙,1987年生,男,汉族,山西吕梁人,助理工程师,主要从事工程勘察、地基处理等岩土工程工作。E-mail:13920834802@139.com
通讯地址：
1. 天津市勘察院, 天津 300191; 2. 天津城市建设学院土木工程学院, 天津 300384; 3. 中国地质大学地球科学与资源学院, 北京 100083
1.TianjinProspectingInsitute,Tianjin300191,China; 2.Departmentofcivilengineering,TianjinInstituteofurbanconstruction,Tianjin300384,China; 3.SchoolofEarthScienceandResources,ChinaUniversityofGeosciences,Beijing100083,China
中图分类号:TU411
doi:10.3969/j.issn.1007-2993.2012.05.009
出版物：岩土工程技术
收稿日期:2012-07-10
网络出版日期:2021-07-06
关键词:吹填软土,侧向卸荷,不排水条件,真三轴试验,应变
Key words:soft dredger soil,lateral unloading,undraining condition,true triaxial test,strain
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