Evaporative Cracking Characteristics of the Embankment Soil Affected by the Saline Concentration

Jiawei Liu,Mingming Hu,Guoping Hu,Hui Li,Yingzhi Xia,Yonghong Wang

doi:10.1155/2022/2269654

Abstract

Embankment soil affected by saline can not only cause roadbed settlement, frosting, and road cracks but also cause corrosion and cracking of roadbed pipelines, which seriously affects the stability of the road. Water evaporation and dry cracking of the saline soil mainly cause soil swelling, poor water stability, and corrosive characteristics of the embankment soil. In this study, the evaporative cracking characteristics of soil with different saline concentrations were investigated. The results showed that the moisture content decreased linearly with the drying time in the early evaporation process, subsequently decreased slow down in the mid-term evaporation, and finally become got and remain a residual moisture content, which are 46.39%, 44.05%, 42.70%, and 40.27% with the increase of the saline concentration. The evaporation process with different saline concentrations in the soil can be divided into three stages: uniform evaporation stage, slow down evaporation stage, and equilibrium evaporation stage, which was consistent with the moisture content change. With the development of the drying time, the cracks gradually appeared on the soil surface, gradually deepened in the soil, and expanded the crack network. The development of cracks can be divided into three stages: the cracking preparation stage, the crack development stage, and the crack stable stage. The cracking began at high evaporation rate under high saline concentration, and the fractal dimension remained stable under similar saline concentration. The fractal dimension was gradually increased with the decrease of the moisture content and the increase of the saline concentration, respectively. The soil began to crack with larger moisture under high saline concentration. The drying cracks in the nature were consistent with the configuration of the cracks formed in the experimental results.

Highlights

Saline soil is widely distributed in China and the world, which seriously harms the industry, agriculture, and infrastructure [1]. e chemical state of the saline soil is changed under the unique arid and semiarid climatic conditions, which can seriously affect the water evaporation and drying and cracking characteristics of the soil [2]. e saline soil showed the characteristics of expansion, poor water stability, and corrosiveness of the soil, which can cause salt expansion, settlement, and muddying of the roadbed [3]
Volume shrinkage, and deformation of the saline soil appeared under the condition of high temperature exposure [4]. e surface water loss rate was much faster than the inner water loss rate in the compacted embankment. e uneven water loss leads to uneven soil shrinkage, which causes the horizontal network cracks on the surface of the embankment soil [5, 6]
Evaporation Process of the Saline-Alkali Soil. e evaporation of soil moisture is the process by which water enters the atmosphere from the soil surface, resulting in a decrease in the moisture content of the soil surface and gradual drying, leading to soil cracking, settlement deformation, soil salinization, and desertification

Summary

Introduction

Saline soil is widely distributed in China and the world, which seriously harms the industry, agriculture, and infrastructure [1]. e chemical state of the saline soil is changed under the unique arid and semiarid climatic conditions, which can seriously affect the water evaporation and drying and cracking characteristics of the soil [2]. e saline soil showed the characteristics of expansion, poor water stability, and corrosiveness of the soil, which can cause salt expansion, settlement, and muddying of the roadbed [3]. E saline soil showed the characteristics of expansion, poor water stability, and corrosiveness of the soil, which can cause salt expansion, settlement, and muddying of the roadbed [3]. Volume shrinkage, and deformation of the saline soil appeared under the condition of high temperature exposure [4]. E uneven water loss leads to uneven soil shrinkage, which causes the horizontal network cracks on the surface of the embankment soil [5, 6]. Roadbed soil cracking is a common disease in road engineering, especially the high-filled roadbed with saline soil, causing uneven settlement of the roadbed and causing. Cracks can increase the permeability of the soil, adversely affecting the flow of groundwater, which eventually causes damage of the roadbed and embankment soil [14]. Cracks can increase the permeability of the soil, adversely affecting the flow of groundwater, which eventually causes damage of the roadbed and embankment soil [14]. e embankment soil cracking circulates with the seasons and the humidity of the environment and is directly related to temperature [15]

Methods

Results

Conclusion