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Engineering geological characteristics and failures of dispersive clays in Northeast China
Abstract Dispersive clays are a type of clay in which clay particles are dispersed in low-salt water. Dispersive clays are widely distributed in Northeast China and have caused considerable engineering failures. In this study, we analyzed the engineering geological properties of dispersive clays, including grain size and mineral composition, physico-chemical indices, dispersibility, and physical and mechanical properties. We found that the dispersive clays contained the main minerals, including quartz, albite, potash feldspar, and clay minerals. High exchangeable sodium ion contents and high pH were the main controls on the dispersibility of the dispersive clays. Four types of dispersive clay failure were classified based on the studied characteristics, including erosion failure, piping failure, freeze–thaw cycle failure, and landslide failure. The erosion failure and piping failure influential factors of dispersive clays were determined by their engineering geological characteristics and external climate, including the dispersibility of clays, external water, and climate changes. The influential factors of freeze–thaw cycles failure were cold climate and water supply, and freeze–thaw and soaking were the main factors causing landslide failure. To control dispersive clay failures, we must prevent the frost heave failure and the soaking of dispersive clays with external water. Key methods to control include modification of the clays to improve their durability and isolating them from external water sources.
Engineering geological characteristics and failures of dispersive clays in Northeast China
Abstract Dispersive clays are a type of clay in which clay particles are dispersed in low-salt water. Dispersive clays are widely distributed in Northeast China and have caused considerable engineering failures. In this study, we analyzed the engineering geological properties of dispersive clays, including grain size and mineral composition, physico-chemical indices, dispersibility, and physical and mechanical properties. We found that the dispersive clays contained the main minerals, including quartz, albite, potash feldspar, and clay minerals. High exchangeable sodium ion contents and high pH were the main controls on the dispersibility of the dispersive clays. Four types of dispersive clay failure were classified based on the studied characteristics, including erosion failure, piping failure, freeze–thaw cycle failure, and landslide failure. The erosion failure and piping failure influential factors of dispersive clays were determined by their engineering geological characteristics and external climate, including the dispersibility of clays, external water, and climate changes. The influential factors of freeze–thaw cycles failure were cold climate and water supply, and freeze–thaw and soaking were the main factors causing landslide failure. To control dispersive clay failures, we must prevent the frost heave failure and the soaking of dispersive clays with external water. Key methods to control include modification of the clays to improve their durability and isolating them from external water sources.
Engineering geological characteristics and failures of dispersive clays in Northeast China
Wang, Lixiang (author) / Song, Xinjiang (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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