基于电阻率法的膨胀土膨胀性评价研究

发布时间：2018-03-04 05:02

本文选题：膨胀土　切入点：膨胀率　出处：《岩土力学》2017年01期 　论文类型：期刊论文

【摘要】：目前膨胀土的膨胀率一般只能通过室内试验获取,无法通过简单快速的测试得到。结合课题组前期的相关膨胀土电学特性试验研究发现,膨胀土吸水膨胀会改变土体内部结构,而土体内部结构的变化会引起电阻率的改变。通过对取自合肥的膨胀土进行电阻率、膨胀率等相关性能的试验,分析电阻率指标,并对膨胀土的吸水膨胀特性进行预测评价。研究发现,膨胀率随着初始电阻率的增大而增大,且随着上覆荷载的增大而减小;竖向电阻率与实时膨胀率基本呈直线增加关系,直至土体电阻率达到孔隙液电阻率为止。根据膨胀土基本电学试验和膨胀土吸水膨胀及相应横纵向电阻率实时测试试验研究发现,膨胀土的膨胀性能与电阻率结构参数吻合很好,因此,可以通过电阻率相关指标对膨胀土的膨胀特性进行预测。由于相应膨胀率为无量纲指标,故通过黏性土电阻率结构参数去除孔隙率影响,建立了无量纲综合电阻率指标Er与膨胀率之间的关系,以供后期膨胀土的膨胀率预测。
[Abstract]:At present, the swelling rate of the general can only be obtained through the indoor experiment, cannot be obtained by simple rapid test. Based on the experimental study of soil electrical properties related to expansion of our research group found that the expansive soil swelling will change the internal structure of the soil, and the change of soil structure will cause the change of resistivity. The resistivity of the expansive soil from Hefei, the relevant performance test of expansive rate, resistivity analysis index, and the water swelling characteristics were evaluated. The study found that the expansion rate increases with the increase of initial resistivity, and decreases with the overlying load; vertical resistivity and real-time expansion rate linearly increased, until the soil the resistivity of pore fluid resistivity reached so far. According to the basic electrical test of expansive soil and expansive soil swelling and the corresponding horizontal and vertical resistivity measuring The pilot study found that the swelling performance and electrical resistivity structural parameters are in good agreement, therefore, can through the resistivity index related to the expansion properties of the expansive soil were predicted. Due to the corresponding expansion rate for dimensionless index, so the cohesive soil resistivity structure parameters to remove the influence of porosity, establish the relationship between the comprehensive resistivity index dimension the Er rate of expansion and the expansion rate forecast for late expansive soil.

【作者单位】：东南大学岩土工程研究所;东南大学江苏省城市地下工程与环境安全重点实验室;合肥工业大学资源与环境工程学院;中交第一公路勘察设计研究院有限公司;
【基金】：国家自然科学基金重点项目(No.41330641);国家自然科学基金项目(No.41202203)~~
【分类号】：TU443

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