黏性土水理性质温度效应研究

邵玉娴; 施斌; 刘春; 顾凯; 唐朝生

黏性土水理性质温度效应研究 English Version

邵玉娴^1,2,
施斌^1,,
刘春¹,
顾凯¹,
唐朝生¹

1. 南京大学地球科学与工程学院地球环境计算工程研究所，江苏南京 210093 ； 2. 国家气候中心，北京 100081

基金项目: 国家自然科学基金重点项目(40730739)；江苏省普通高校研究生科研创新计划项目(CX09B_011Z)

详细信息

作者简介:
邵玉娴 (1983 – ) ，女，江苏扬州人，博士研究生，从事环境岩土工程和地温场研究。

中图分类号: TU442
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出版历程
- 发布日期: 2011-10-14

Temperature effect on hydro-physical properties of clayey soils

1. The School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China; 2. National Climate Center, Beijing 100081, China

摘要

摘要: 温度影响着黏性土的液塑限、膨胀性和渗透性等水理性质，对于不同的黏性土，这种影响往往差异很大。为了系统地研究这一影响的规律性和机理，以南京地区 3 种不同矿物组分的黏性土为研究对象，开展了土样在 5 ℃～ 50 ℃范围内吸附结合水量、液塑限、膨胀性和渗透性的试验研究。结果表明：温度升高时，黏性土液限减小，膨胀性增加，渗透性增加，这种温度效应根本原因在于吸附结合水量变化。亲水矿物由于其吸附结合水量大，对温度效应起主要作用。亲水矿物含量较多的黏性土，液限随温度变化大，而膨胀率则变化小。亲水矿物含量对渗透性的温度效应影响显著，对比吸附结合水试验：温度升高时，其渗透水由吸附结合水为主转为渗透结合水和自由水为主，渗透系数可上升近十倍。揭示了黏性土 3 种基本水理性质温度效应的规律性及机理，为相关的地质灾害的评估和预防提供理论基础。
- 黏性土 /
- 水理性质 /
- 温度 /
- 机理
Abstract: Temperature has great influence on the hydro-physical properties of clayey soils, such as Atterberg limits, swelling and permeability. This temperature effect may be distinct among different types of soils. In order to systematically study the regularity and mechanism of the effect, this research is conducted to evaluate the adsorbed water content, Atterberg limits, swelling and permeability through laboratory study in the range of 5 ℃ -50 ℃ , among three common types of clayey soils in Nanjing with different mineral compositions. The results indicate that the liquid limit reduces, the swelling increases, the permeability increases with rising temperature, and the temperature effect is fundamentally due to the change of adsorbed water content. Hydrophilic minerals, which contain large amounts of adsorbed water, play an important role in the temperature effect. With the increase of hydrophilic minerals, the temperature effect on the liquid limit increases and the effect on the swelling ratio decreases. The content of the hydrophilic minerals has significant impact on the temperature effect of permeability. The results of adsorbed water content show that the adsorbed water transports to penetrate water and free water when temperature rises, and permeability may increase by tenfold. It indicates the laws and mechanism of the temperature effect on three basic hydro-physical properties of clayey soils, which provides a theoretical basis for assessment and prevention of corresponding geological hazards.
- clayey soils /
- hydro-physical property /
- temperature /
- mechanism

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