Abstract
In the Nanyang section of the midroute of the South-to-North Water Transfer Project, the expansive soil is often used as a filler for high-fill channels. After the channel is stabilized, the expansive soil undergoes creep deformation over time. Studying the creep characteristics of expansive soils in different environments is particularly important for evaluating the safe operation of high-fill channels. In the current study, the creep test of expansive soil under different moisture content and dry density was carried out. It is proposed that the slope of the fitted straight line in the compression curve of the expansive soil can be used to represent the secondary consolidation coefficient of unsaturated expansive soil, and the variation law of the secondary consolidation coefficient under different environmental factors is obtained. The modified Bjerrum calculation method considering the influence of additional load and lateral deformation yields the postexpansion soil settlement curve model to determine the control index range of the project site. Moreover, it is also observed that the secondary consolidation coefficient of unsaturated expansive soil increases with the increase of moisture content and decreases with the increase of dry density. The coefficient of secondary compression of unsaturated expansive soil is linearly related to dry density and moisture content. After the preconsolidation treatment of the expansive soil, when the load level is less than the preload, the secondary consolidation coefficient is smaller, otherwise the secondary consolidation coefficient is larger.
Highlights
Review ArticleIn the Nanyang section of the midroute of the South-to-North Water Transfer Project, the expansive soil is often used as a filler for high-fill channels
Introduction eSouth-to-North Water Transfer Project is a strategic project to alleviate the severe shortage of water resources in northern China. e main water delivery channel of the midroute of the South-to-North Water Transfer Project is 1472 km long and passes through a large number of expansive soil areas along the route [1]. e cumulative length of the expansive soil section is about 340 km, accounting for 20% of the total length (Figure 1)
In the South-to-North Water Diversion Project, the channel panel lining has high requirements for canal slope deformation, and creep deformation is an important part of canal slope deformation. erefore, this paper focuses on the study of the creep characteristics of the expansive soil in Nanyang high-Fill channel. e Nanyang section of the South-to-North Water Diversion Project is located at the junction of North and South China. e special temperate monsoon often causes changes in the external environment, which directly leads to changes in moisture content and dry density
Summary
In the Nanyang section of the midroute of the South-to-North Water Transfer Project, the expansive soil is often used as a filler for high-fill channels. E main water delivery channel of the midroute of the South-to-North Water Transfer Project is 1472 km long and passes through a large number of expansive soil areas along the route [1]. In the Nanyang section of the South-to-North Water Transfer Project, most of the infills are expansive soils. Creep refers to the phenomenon that the strain of solid material increases with time under the condition of keeping the stress constant [4] E expansive soil in the South-to-North Water Transfer Project is often in an unsaturated state. Creep indirectly affects all processes of soil mechanics, which is an important issue in soil mechanics. e expansive soil in the South-to-North Water Transfer Project is often in an unsaturated state. e creep deformation of unsaturated expansive soil is very slow
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