冻融作用对黄土湿陷性的影响

发布时间：2018-07-01 18:50

本文选题：增(减)湿 + 冻融变形　；参考：《地下空间与工程学报》2016年06期

【摘要】：为分析冻融作用对黄土湿陷性的影响,采用室内试验方法。首先,以Q3黄土为研究对象,采用增(减)湿法配制不同含水量黄土试样,测试黄土在无水补给条件下受温度影响的冻融变形、压缩变形、湿陷变形;对原状黄土进行颗粒分析及基本物理力学参数试验。试验结果表明:黄土是否产生冻胀取决于其含水量是否超过"临界冻胀含水量"。冻融黄土与原状黄土相比压缩变形量较大,把部分浸水湿陷变形转化为压缩变形,冻融作用使黄土的湿陷性弱化。冷冻黄土在相同温度下,含水量越大,湿陷系数越小;在同一含水量下,冻结温度愈低湿陷系数愈小。
[Abstract]:In order to analyze the effect of freezing and thawing on collapsibility of loess, laboratory test method was adopted. Firstly, taking Q3 loess as the research object, the loess samples with different moisture content were prepared by increasing (decreasing) moisture method, and the freezing and thawing deformation, compression deformation and collapsing deformation of loess under the condition of no water recharge were tested. The particle analysis and basic physical and mechanical parameter tests of undisturbed loess were carried out. The test results show that the frost heaving of loess depends on whether its water content exceeds the critical frost heave water content. The compression deformation of freeze-thawed loess is larger than that of undisturbed loess. The deformation of partial immersion collapsibility is transformed into compression deformation, and the collapsibility of loess is weakened by freezing and thawing. At the same temperature, the higher the moisture content, the smaller the coefficient of collapsibility, and the lower the coefficient of collapsibility is under the same water content.
【作者单位】：西安长庆科技工程有限责任公司;西北大学大陆动力学国家重点实验室;
【分类号】：TU444

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