Experimental Investigation of Shear Strength of Carbonate Saline Soil under Freeze-Thaw Cycles

被引:7
作者
Qiu, Kaichi [1 ,2 ]
Ding, Lin [3 ]
Yu, Wenbing [1 ,2 ,4 ]
Chen, Kezheng [5 ]
Huang, Shuai [6 ]
Gao, Kai [4 ]
机构
[1] Chongqing Jiaotong Univ, State Key Lab Mt Bridge & Tunnel Engn, Chongqing 400074, Peoples R China
[2] Chongqing Jiaotong Univ, Sch Civil Engn, Chongqing 400074, Peoples R China
[3] Heilongjiang Univ, Coll Architecture & Engn, Harbin 150080, Peoples R China
[4] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China
[5] Northeast Forestry Univ, Coll Engn & Technol, Harbin 150040, Peoples R China
[6] Northeast Forestry Univ, Sch Civil Engn, Harbin 150040, Peoples R China
基金
中国国家自然科学基金;
关键词
climate change; freeze-thaw cycle; carbonate saline soil; shear strength; microstructure; MECHANICAL-PROPERTIES; SALT; CRYSTALLIZATION; BEHAVIORS; REGION;
D O I
10.3390/atmos13122063
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Climate change is accelerating its adverse impact on ecosystems and infrastructure systems in cold regions. For extensive carbonate saline soil areas, their response to the freeze-thaw cycle remains uncertain. By considering the continuous intensification of freeze-thaw cycle frequency, the mechanical characteristics of carbonate saline soils are analyzed for different salt content (0.6% to 2.1%) based on the mechanical test in this paper. The purpose is to reveal the change law of shear strength and its parameters of carbonate saline soils under the scenario of continuous freezing and thawing cycles. The micro-characteristics of the carbonate saline soil before and after freeze-thaw cycling were analyzed by scanning electron microscopy, indicating changes in the structural soil properties caused by the combination of freeze-thawing and salinity. The scanning electron microscope images reveal the cumulative effect of frost heaving and salt expansion, i.e., increasing the number of pores between particles, reducing the effective contact between particles, and weakening the interaction force, resulting in cracks development. A series of mechanical tests demonstrate the stress-strain behavior of carbonate saline soils for different numbers of freeze-thaw cycles under different confining pressures. A transformation from strain-softening to strain-hardening is observed with an increase in the salt content from 0.6% to 2.1%. Furthermore, the shear strength of the carbonate saline soil decreases as the salt content and number of freeze-thaw cycles increase. The shear strength degradation mechanism is attributed to the cohesion and the internal friction angle. These shear strength parameters are critical in geotechnical analyses, such as evaluating of load capacity of foundations and slope stability in similar saline soils.
引用
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页数:19
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