Experimental Study on the Freezing Temperatures of Saline Silty Soils

被引：170

作者：

Wan, Xusheng ^{[1
]}

Lai, Yuanming ^{[1
,2
]}

Wang, Chong ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, State Key Lab Frozen Soil Engn, Cold & Arid Reg Environm & Engn Inst, Lanzhou 730000, Gansu, Peoples R China

[2] Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou, Gansu, Peoples R China

[3] Lanzhou Univ, Sch Civil Engn & Mech, Lanzhou, Gansu, Peoples R China

来源：

PERMAFROST AND PERIGLACIAL PROCESSES | 2015年 / 26卷 / 02期

基金：

中国国家自然科学基金;

关键词：

sulfate saline soil; freezing temperature; water activity; surface free energy; Qinghai-Tibet Plateau; CRYSTALLIZATION; THERMODYNAMICS; MODEL;

D O I：

10.1002/ppp.1837

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

The freezing temperature of soil is an important index to judge whether it is in a frozen state or not, and plays a key role in distinguishing salt expansion from frost heave. Freezing experiments on sulfate saline soil and its ion solution indicate that the initial freezing temperature of the soil is mainly determined by the properties of the ion solution. The effects of saline soil types and saline solution concentrations on the freezing temperature are also investigated. An equation to calculate the freezing temperature of the sulfate salt solution is deduced from the Pitzer ion model and its validity is verified by the experimental results. Under the assumption that the soil freezing temperature is determined by the freezing temperature of the corresponding ion solution and the energy of the ice-liquid interface, a precise relation between the soil freezing temperature and the radius of the ice-liquid interface is obtained and a general equation to determine the freezing temperature of the silty clay of the Qinghai-Tibet Plateau is proposed. Copyright (c) 2015 John Wiley & Sons, Ltd.

引用

页码：175 / 187

页数：13

共 26 条

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