文献类型：期刊文献

中文题名：湛江结构性黏土现场原位试验及分析

英文题名：In-situ Test and Analysis of Structural Clay of Zhanjiang Group

作者：曾岳[1];管圣功[2];张芳[2];陈帅[1]

机构：[1]中冶武勘工程技术有限公司,武汉430080;[2]绍兴文理学院土木工程学院,浙江绍兴312000

年份：2023

期号：6

起止页码：73

中文期刊名：路基工程

外文期刊名：Subgrade Engineering

语种：中文

中文关键词：湛江组黏土;现场原位试验;抗剪强度;灵敏度;锥尖阻力;侧摩阻力;承载特性;结构性

外文关键词：structural clay of Zhanjiang group;in-situ test;shear strength;sensitivity;cone tip resistance;side friction;bearing characteristics;structural

中文摘要：对湛江组结构性黏土进行十字板剪切试验、静力触探试验、平板载荷试验,分析不同原位试验条件下湛江组黏土的力学响应曲线。结果表明:十字板剪切试验中,剪切初期原状湛江组黏土抗剪强度随时间迅速呈线性增长,峰值过后,抗剪强度随时间呈凹曲线形式下降,扰动状湛江组黏土剪切破坏曲线呈双曲线,没有明显的峰值点,灵敏度随着土层深度的增加总体变化不大;静力触探试验中,qc-h曲线形态总体比较平滑,侧阻力fs-h曲线形态有较小的起伏,呈锯齿状,且qc、fs值沿深度没有太大变化;平板载荷试验中湛江组黏土呈整体剪切破坏,变形经过压密阶段、塑性变形阶段、破坏阶段三个阶段,湛江组黏土塑性变形阶段所处荷载区间较小,在破坏阶段破坏具有突然性;地基未破坏前,每级压力作用下的沉降随时间曲线变化趋势相同,荷载每增加一级,沉降-时间曲线初始值相对上一级荷载陡增,地基荷载达到临界值时,湛江组黏土发生瞬时破坏,表现出结构性;平板载荷试验在其宽度的2.5倍范围内附加荷载影响较大,2.5倍载荷板宽度深度以下土体可不考虑载荷板上荷载的影响。

外文摘要：Vane shear test,static penetration test,and plate loading test were conducted on structural clay of Zhanjiang group,and the mechanical response curves of the clay under different in-situ test conditions were analyzed.The results show that,in the vane shear test,the shear strength of undisturbed Zhanjiang clay presents a rapid linear increase with time at the initial stage of shear and,after the peak value,the shear strength decreases with time in a form of concave curve,while the shear failure curve of disturbed Zhanjiang clay is hyperbolic curve without obvious peak point,and there is few changes on the sensitivity with the increase of soil depth;in the static penetration test,the overall shape of qc-h curve is relatively smooth,and the side friction fs-h curve has small fluctuations,showing a serrated shape,and the qc and fs values do not change significantly along the depth;in the plate loading test,the clay of Zhanjiang group exhibits general shear failure,and the deformation has three stages:compaction stage,plastic deformation stage,and failure stage,and the clay undergoes in a small loading range in the plastic deformation stage,and is subject to a sudden failure in the failure stage;before the foundation is damaged,the settlement vs.time curve under the action of each pressure grade has the same trend of variation and,for every increase of load grade,the initial value of this curve increases sharply compared to the previous load grade,when the foundation load reaches the critical value,Zhanjiang group clay undergoes instantaneous damage,exhibiting constitutive property;for the plate loading test,the application of load within a range of 2.5 times the width have large impact,thus for the soil mass under the depth of 2.5 times the width of the load plate,the influence of the load on the plate may not be taken into consideration.