不同含水量粉土与土钉界面的剪切特性

李永辉; 杨家旺; 王天东; 高健利

doi:10.11988/ckyyb.20230715

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长江科学院院报 ›› 2024, Vol. 41 ›› Issue (11) : 151-157. DOI: 10.11988/ckyyb.20230715

岩土工程

不同含水量粉土与土钉界面的剪切特性

李永辉 ¹ ,
杨家旺 ¹ ,
王天东 ² ,
高健利 ²

作者信息 +

Shear Characteristics of Interface between Silt and Soil Nail with Different Water Content

Author information +

文章历史 +

摘要

通过控制含水量的粉土与土-钉界面拉拔剪切室内试验,研究不同土体含水量及上覆压力时,钉-土界面的剪切应力与剪切位移关系、界面剪切强度及表观摩擦系数的变化规律。试验结果表明:钉-土界面剪切应力随上覆压力的增加而显著增加,峰值剪切应力对应的拉拔位移也逐渐增大,且剪切应力达到峰值后出现软化现象;钉-土界面的剪切应力与土体含水量呈负相关;峰值、残余剪切应力均随着上覆压力的增大近似呈线性增加,随着土体含水量的增大而显著下降;峰值应力与残余剪切应力的差值随着土体含水量的增加而减小,随着上覆压力的增加而增大。研究成果可为土钉拉拔承载性能研究提供参考。

Abstract

To study the relationship between shear stress and shear displacement at the nail-soil interface, as well as the variation of interfacial shear strength and apparent friction coefficient with changes in soil water content and stress state, a pull-out shear test was conducted on the interface between silt and nail under controlled water content in this paper. The results of the soil-nail interface shear test were compared with those of the soil-structure shear test. Additionally, a calculation analysis of the shear stress at the nail-soil interface was conducted. The results show that the shear stress at the nail-soil interface increases significantly with the increase in overburden pressure, and the pull-out displacement corresponding to the peak shear stress also increases gradually. Meanwhile, a softening phenomenon occurs after the shear stress reaches its peak. The shear stress at the soil interface is negatively correlated with the soil’s water content. The shear stress in the low water content silt test is almost double that of the saturated silt test, and the pull-out displacement corresponding to the peak shear stress also increases by about twofold. The peak and residual shear stresses increase approximately linearly with increasing overburden pressure, and decrease significantly with increasing soil water content (w). The difference between them decreases with increasing w, and increases with increasing overburden pressure. The research results can provide a reference for studying the pull-out bearing capacity of nails.

导出引用

李永辉, 杨家旺, 王天东, 等. 不同含水量粉土与土钉界面的剪切特性[J]. 长江科学院院报. 2024, 41(11): 151-157 https://doi.org/10.11988/ckyyb.20230715

LI Yong-hui, YANG Jia-wang, WANG Tian-dong, et al. Shear Characteristics of Interface between Silt and Soil Nail with Different Water Content[J]. Journal of Yangtze River Scientific Research Institute. 2024, 41(11): 151-157 https://doi.org/10.11988/ckyyb.20230715

中图分类号： TU441.7

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摘要

桩-土界面剪切性状制约着桩基受力特性,对研究桩-土相互作用机理具有重要意义。利用改进后的直剪仪,进行海洋黏土与钢板、混凝土板的界面剪切试验,研究不同含水率、不同固结时间的海洋黏土与钢、混凝土界面的剪切应力-剪切位移关系。结果表明:界面剪切应力-剪切位移关系表现出较好的弹塑性关系,可用双曲线模型表示;随着法向应力增大、含水率减小和固结时间增长,界面峰值剪切应力增大,所需峰值剪切位移增加,峰值剪应力的增加集中在固结开始后的14 d内;界面摩擦角和界面黏聚力随含水率增加而减小,界面摩擦角受固结时间影响不大,集中在20°～23°范围内,界面黏聚力随固结时间增加而增大,且集中在固结开始后的14 d内。研究成果可为海洋桩基工程沉桩阶段阻力估算及数值模拟提供参考。

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https://doi.org/10.11988/ckyyb.20171138

摘要

The mechanical behaviors of pile foundation are restricted by the shear behavior of pile-soil interface which is of importance for the study of pile-soil interaction mechanism. In this research, shear tests on marine clay-steel interface and marine clay-concrete interface were conducted via an improved direct shear apparatus to investigate the relationship between shear stress and shear displacement of interface with varied water content and consolidation time. Results indicate that relationship between shear stress and shear displacement of interface displayed good elastic-plasticity which can be expressed by hyperbolic model. The peak shear stress and displacement of interface increased with the climbing of normal stress, the declining of water content and the extension of consolidation time. The increment of peak shear stress concentrated within 14 days after consolidation. Moreover, the friction angle and cohesive force of interface decreased with the climbing of water content. Consolidation time had little influence on the friction angle of interface which concentrated in the range from 20 degrees to 23 degrees. The cohesive force of interface increased with the increasing of consolidation time, and such increment concentrated within 14 days after the initiation of consolidation. The research findings provide reference for estimating the resistance during the pile driving stage and for numerical simulation of marine pile foundation engineering.