合肥重塑膨胀土三向膨胀力试验研究

发布时间：2018-03-23 05:08

本文选题：重塑膨胀土　切入点：三向胀缩仪　出处：《岩土力学》2017年S1期 　论文类型：期刊论文

【摘要】：以合肥重塑膨胀土为研究对象,采用改进的三向胀缩仪开展了16组不同初始含水率与干密度的三向膨胀力试验。研究结果表明,(1)在所研究的含水率、干密度范围内竖向膨胀力总是大于横向膨胀力,快速膨胀阶段大致在0~2 h以内,该阶段竖向膨胀力可达到极限膨胀力的80%以上;(2)同一干密度下竖向膨胀力随初始含水率增大而减小,竖向膨胀力与初始含水率之间具有良好的线性关系,且干密度越大,竖向膨胀力随着初始含水率的变化速率越大;(3)在竖向膨胀力与干密度的关系图中,每条曲线均以干密度1.6 g/cm~3为分界点呈双线性关系;(4)由膨胀力对数与初始干密度的关系,不同初始含水率下的ln(P_z)-ρ_d关系为一系列近似平行的递增直线,直线斜率大致相同,说明膨胀力随初始干密度的变化速度不随含水率的变化而变化。
[Abstract]:Taking remolded expansive soil in Hefei as the research object, 16 groups of three dimensional expansion force tests with different initial moisture content and dry density were carried out by using an improved three dimensional dilatometer. In the range of dry density, the vertical expansion force is always larger than the transverse expansion force, and the rapid expansion stage is within 0 ~ 2 h. At the same dry density, the vertical expansion force decreases with the increase of the initial moisture content, and there is a good linear relationship between the vertical expansion force and the initial water content, and the greater the dry density, the greater the dry density. In the diagram of the relationship between the vertical expansion force and dry density, each curve has a bilinear relationship with the dry density of 1. 6 g/cm~3.) the relationship between the logarithm of the expansion force and the initial dry density is determined by the relationship between the logarithm of the expansion force and the initial dry density. Under different initial moisture content, the relation of InnsPz-蟻 _ d is a series of parallel increasing straight lines, and the straight line slope is approximately the same, which indicates that the expansion force does not change with the change of initial dry density with the change of moisture content.
【作者单位】：中国科学院大学;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家自然科学基金项目(No.51579236)~~
【分类号】：TU443

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