引江济淮工程膨胀土水泥改性剂量研究

发布时间：2018-05-14 04:06

本文选题：引江济淮 + 弱膨胀土　；参考：《岩土工程学报》2017年S1期

【摘要】：膨胀土具有遇水膨胀、失水收缩的工程特性,掺加一定量水泥对其进行改性是处理膨胀土的主要方法之一。选取引江济淮工程弱膨胀土,通过对素膨胀土和改性土的自由膨胀率、界限含水率及无侧限抗压强度的试验分析,揭示了水泥掺量和养护日期对引江济淮工程弱膨胀土的物理力学性质的影响。试验结果表明:(1)随掺灰率的增加,改性膨胀土的自由膨胀率、液限、塑性指数均降低,无侧限抗压强度增加;(2)随养护日期的增加,自由膨胀率、液限、塑性指数减小,无侧限抗压强度增大;(3)基于本研究试验结果,同时综合考虑工程实际,建议引江济淮工程弱膨胀土水泥改性剂量为4%。
[Abstract]:Expansive soil has the engineering characteristics of water expansion and water loss shrinkage. It is one of the main methods to treat expansive soil by adding a certain amount of cement to modify it. In this paper, the free expansion ratio, limit moisture content and unconfined compressive strength of plain expansive soil and modified soil are analyzed by selecting weak expansive soil in Jiangjiangjianghuai project. The influence of cement content and curing date on the physical and mechanical properties of weakly expansive soil in Jiangjiangjianghuai project was revealed. The experimental results show that the free expansion rate, liquid limit and plasticity index of the modified expansive soil decrease with the increase of the cement content, and the compressive strength of the modified expansive soil decreases with the increase of curing date. The free expansion rate, liquid limit and plastic index decrease with the increase of curing date. Based on the experimental results and considering the engineering practice, it is suggested that the modified dosage of cement for weak expansive soil in Jianjiangjianjianghuai project is 4.
【作者单位】：河海大学土木与交通学院;
【分类号】：TV223

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