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肖 健1 , 殷 杰2
( 1 . 江苏城乡建设职业学院 土木工程学院 ,常州 213147 ; 2. 江苏大学 土木工程与力学学院 ,镇江 212013)
摘 要 :为研究软土三轴固结不排水强度及临界状态 ,针对原状土和重塑土试样进行一维固结压缩试验、三轴 K0 固结和等向固结不排水剪切试验 ,对比分析不同固结方式下土样的固结不排水抗剪强度特性 ,并基于土样的临界状态理论 ,考虑各向异性的影响 ,提出重塑土 K0 固结不排水抗剪强度预测公式。试验结果表明:原状土试样的压缩曲线具有明显的转折点 ,重塑土试样的压缩系数随含水率的增加线性增大;土样在 K0 固结过程中内部形成侧向约束状态 ,剪切过程中相较于等向固结表现出更大的抵抗变形的能力 ,同一条件下试样的 K0 固结不排水抗剪强度大于等向固结不排水抗剪强度 ,重塑土 K0 固结不排水强度与含水率呈线性负相关;考虑各向异性修正重塑土样 K0 固结不排水抗剪强度预测公式 ,公式计算值与试验值较吻合。研究揭示了软土在不排水条件下的强度统一演化机制 ,量化预测软土在不排水剪切下的最终强度与变形 ,为地基承载力、边坡稳定等分析提供理论依据。
关键词:软土 ;不排水抗剪强度 ;含水率 ;各向异性 ;临界状态
中图分类号:TU411 文献标志码:A 文章编号: 1005- 8249 (2026) 02- 0078- 07
DOI:10. 19860/j.cnki.issn1005 - 8249.2026.02.013
Experimental Study on the Undrained Shear Strength Characteristics and Critical
State of Soft Soil in Triaxial Consolidation Test
XIAO Jian1 , YIN Jie2
( 1 . Department of Civil Engineering , Jiangsu Urban and Rural Construction Vocational
College , Changzhou 213147 , China; 2. Faculty of Civil Engineering and Mechanics ,
Jiangsu University , Zhenjiang 212013 , China)
Abstract : To investigate the triaxial consolidated undrained strength and critical state of soft soil , one - dimensional consolidation tests , triaxial K0 consolidation , and isotropic consolidated undrained shear tests were conducted on both undisturbed and remolded soil samples . The undrained shear strength characteristics of the soil samples under different consolidation methods were comparatively analyzed . Additionally , based on the critical state theory and considering anisotropic effects , a prediction formula for the K0 consolidated undrained shear strength of remolded soil was proposed . The test results indicate that the compression curves of the undisturbed soil samples exhibit an evident turning point , whereas the compression coefficient of the remolded soil samples increases linearly with rising water content. During the K0 consolidation process , internal lateral restraint conditions are developed within the soil samples , which consequently demonstrate greater deformation
resistance during shear compared to isotropic consolidation. Under identical conditions , the K0 consolidated undrained shear strength of the samples is higher than that of isotropically consolidated samples . Furthermore , the K0 consolidated undrained shear strength of remolded soil displays a linear negative correlation with water content. After incorporating anisotropy corrections into the prediction formula for the K0 consolidated undrained shear strength of remolded soil , the calculated results closely align with the experimental values . This study reveals the unified strength evolution mechanism of soft clay under undrained conditions , enabling quantitative prediction of its final strength and deformation during undrained shearing , thereby providing a theoretical basis for analyzing foundation bearing capacity and slope stability.
Key words : soft soil; undrained shear strength; water content; anisotropy; critical state
项目来源: 国家自然科学基金面上项目 (51978315) ;国家自然科学基金 (41402251 ) ;江苏省高职院校工程技术研究开发中心 -智能建造3D 技术应用 ;江苏城乡建设职业学院智能建造科研平台。
作者简介: 肖 健 (1991 —) , 男 ,硕士研究生 ,讲师 ,研究方向: 土的基本特性。
收稿日期:2025 - 02 - 17
冀公网安备13011002000529 技术支持:数字河北 