International Journal of Earth Sciences and Engineering

Yuanyuan Kong ¹, Dongguo Li ², Qing Wang ¹, Cencen Niu ¹, Wenhua Wang ²

Affiliations
1 College of Construction Engineering, Jilin University, Changchun-130026, CN
2 College of Civil Engineering, Changchun Institute of Technology, Changchun-130012, CN

Abstract

The paper presents frost heave experimental studies performed on the saline soil. The frost heave properties of soil are important for project construction in seasonal frozen area. The effects of initial water content and salinity on the frost heave properties are investigated, and the experiments on sodium carbonate saline soil indicate that the initial water content of the saline soil is mainly factor for frost heave, salt has inhibitory effect on frost heave, and the normal frost heave rate is proportional to the moisture content of soil. In addition, the study shows that the frost heaving stress is proportional to the moisture content of saline soil, and a high salt content can reduce the stress, and the frost heave stress and normal frost heaving ratio have a clear nonlinear relationship. Identifying the frost heave properties provides basic data support for the engineering construction in the seasonal frozen area, and is conductive to understanding the frost heave mechanism of saline soil.

Keywords

Seasonal Frozen Area, Saline Soil, High Sodium Salt, Frost Heaving Ratio, Frost Heave Stress.

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Yuanyuan Kong ¹, Qing Wang ¹, Wen Zhang ¹, Cencen Niu ¹, Dongguo Li ², Wenhua Wang ², Tianwen Yu ¹

Affiliations
1 College of Construction Engineering, Jilin University, Changchun-130026, CN
2 College of Civil Engineering, Changchun Institute of Technology, Changchun-130012, CN

Abstract

The paper presents experimental studies performed on a natural sliding-zone soil evolved by expansive soft rock. Five undisturbed samples and three disturbed samples were obtained from Xinyan landslide zone in Yanbian, Jilin, China. Initially, this study was based on laboratory experiments, including physicochemical tests and swelling tests. A scanning electron microscope was employed to investigate the microfabric of sliding-zone soft rock. Two specimens from each sample, representing the horizontal and vertical planes, were tested. In addition, a quantitative analysis of microstructure was studied by MATLAB programming software and the WD-5 image processing system. Given the difficulty of describing the exact complexity of soft soil pore morphology, box counting dimension was extracted to represent the fractal feature of pore structure. The study shows that the change of microstructure is a biggest reason for the strength decrease of sliding-zone. Identifying structural characteristics is conductive to understanding the failure mechanism of expansive soft rock.

Keywords

Sliding-Zone, Expansive Soil, Microfabric, Quantitative Analysis, Fractal Dimensions.

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