Abstract
Recently, a lot of engineering constructions have been carried out in the Loess Plateau of China. However, the collapsibility of compacted loess as a filler poses a potential threat to the safety and stability of buildings. To address this threat, the scientific evaluation of the collapsibility of compacted loess has become a key to engineering construction. This study, therefore, tested the resistivity of compacted loess under varying conditions of water content, dry density, and its collapsibility coefficient under a pressure of 200 kPa. The correlation between collapsibility and electrical parameters was determined, and based on the resistivity, a new method to evaluate the collapsibility of the compacted loess is proposed. The results show that the resistivity of compacted loess decreases with an increase in water content and dry density and that the effect of water content is more significant. There is a critical water content value that causes the resistivity decay rate to slow down. The collapsibility coefficient also decreases with an increase in water content and dry density, and under the same dry density or same water content, the collapsibility coefficient and resistivity are positively correlated. According to the normalized resistivity value ρ/ρw, the relative collapsibility coefficient δs /0.015, and the water content ω obtained in the experiment, a collapsibility coefficient prediction model based on the resistivity of compacted loess was established. Using resistivity to evaluate the collapsibility of loess is nondestructive and provides a new method to accurately and quickly evaluate the collapsibility of compacted loess.
Highlights
Loess is a yellow silty sediment that is formed in the quaternary period and is gradually transported and accumulated over geological time [1, 2]
We propose a new model for predicting the loess collapsibility coefficient by using the resistivity method. rough the systematic analysis of the test results, the following conclusions can be drawn
(1) e resistivity of the compacted loess is significantly negatively correlated with the dry density and water content, and there is a critical water content at which the decay rate of resistivity with increasing water content present two different states: when the water content is lower than the critical value, the resistivity decay rate is relatively fast, and when the water content exceeds the critical value, the resistivity decay rate is significantly reduced. ereafter, when the water content continues to increase to near the plastic limit, the resistivity decay rate is flat
Summary
Loess is a yellow silty sediment that is formed in the quaternary period and is gradually transported and accumulated over geological time [1, 2]. Loess is widely distributed in China and is mainly concentrated in arid and semi-arid areas such as Shanxi, Shaanxi, southeastern Gansu, and western Henan, in the middle and upper reaches of the Yellow River. It covers a total area of about 640000 km and accounts for more than 6% of the national territory [3,4,5,6]. Collapsible loess accounts for about 60% of the total loess area in China. With the implementation and advancement of China’s western development strategy, ever more infrastructure projects will start construction in the northwestern region of China where the loess is relatively collapsible [4]. Materials are usually taken onsite, and the loess is compacted as foundation and roadbed filler [7]
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