[1]王恒,郭敏,陈军浩.不同砂粒含量和粒径下含砂黏土塑性与不排水强度影响试验[J].福建理工大学学报,2025,23(06):519-527.[doi:10.3969/j.issn.2097-3853.2025.06.002]
　WANG Heng,GUO Min,CHEN Junhao.Experimental study on plasticity and its relationship with undrained strength of sandy clay under different sand content and particle size[J].Journal of Fujian University of Technology;,2025,23(06):519-527.[doi:10.3969/j.issn.2097-3853.2025.06.002]
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不同砂粒含量和粒径下含砂黏土塑性与不排水强度影响试验()
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《福建理工大学学报》[ISSN:2097-3853/CN:35-1351/Z]

卷:
第23卷
期数:
2025年06期
页码:
519-527
栏目:
出版日期:
2025-12-25

文章信息/Info

Title:
Experimental study on plasticity and its relationship with undrained strength of sandy clay under different sand content and particle size
作者:
王恒; 郭敏; 陈军浩
福建理工大学土木工程学院
Author(s):
WANG Heng;  GUO Min;  CHEN Junhao
School of Civil Engineering, Fujian University of Technology
关键词:
含砂黏土; 砂粒含量; 砂粒粒径; 液限; 不排水强度
Keywords:
sandy clay; sand content; sand particle size; liquid limit; undrained strength
分类号:
TU411
DOI:
10.3969/j.issn.2097-3853.2025.06.002
文献标志码:
A
摘要:
通过开展含砂黏土的落锥试验，探究含砂黏土塑性与不排水强度的内在联系随砂粒含量和粒径的演变规律。研究结果表明:含砂黏土液限随砂粒含量的增加而线性减小，砂粒粒径越大，含砂黏土液限越小。当w砂>0% 的含砂黏土不排水强度与黏土含水率关系曲线和w砂=0% 的含砂黏土不排水强度与黏土含水率关系曲线重合时，含砂黏土不排水强度以黏土不排水强度控制为主。当w砂>0% 的含砂黏土不排水强度与黏土含水率关系曲线偏离w砂=0%的含砂黏土不排水强度与黏土含水率关系曲线时，含砂黏土不排水强度由黏土基质的不排水强度与砂粒骨架的承载作用共同构成。最后，提出与黏土液限、砂粒含量和粒径定量相关的含砂黏土不排水强度预测公式，并进行验证，计算得到的不排水强度预测值约为实测值的0.8 ~1.2 倍。随着砂粒含量增加，砂粒接触形成骨架结构是含砂黏土不排水强度发生突变的主要原因。
Abstract:
To investigate the evolution of the internal relationship between plasticity and undrained strength of sandy clay, fall cone tests were conducted on samples with varying sand contents and particle sizes. Results show that the liquid limit of sandy clay decreases linearly as sand content increases, and that larger sand particle sizes result in a lower liquid limit. When the curve of undrained strength versus water content for sandy clay with a sand content (w砂>0%) aligns with that for hosted clay (w砂=0%), the undrained strength is primarily governed by the hosted clay. However, when the curve of undrained strength versus water content for sandy clay with w砂>0% deviates from the curve of undrained strength versus water content of hosted clay, the sand particles begin to contribute more to the overall strength, forming a skeletal structure that enhances the undrained strength. Based on these findings, an equation for predicting the undrained strength of sandy clay was proposed, which quantitatively relates the undrained strength to the liquid limit of the hosted clay, sand content, and particle size. This equation was validated, and the predicted undrained strength values were approximately 0.8 to 1.2 times the measured values. As sand content increases, the development of the sand particle skeleton becomes the primary factor driving a sudden increase in the undrained strength of sandy clay.

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更新日期/Last Update: 2025-12-25