Abstract
At present, there are some key issues in the traditional preimmersion method for reducing the collapsibility of the loess ground, such as the difficulty in determining the total water consumption and the long immersion time. In response to these issues, a new method, the borehole preimmersion method, is presented, and a specific theoretical design model is proposed for application in projects. The method is specifically discussed from a new perspective, and the diffusion mechanism and evolution law of water in the ground are presented in detail through theoretical analysis and numerical calculation, respectively. The water diffusion is a mushroom‐type form for a single water injection hole immersed in water. A calculation model derived for a single water injection hole or a group of water injection holes based on the research results is used to calculate the volumes of soaked loess and the total water consumption. Through an in situ immersion test, the treatment effect of this method is evaluated to verify the rationality of the method and the theoretical calculation model proposed in this study, which provides a new method and theoretical framework for effectively reducing the collapsibility of the loess ground.
Highlights
Loess is a yellow sediment deposited during the transportation of Quaternary aeolian sand that is widely distributed in arid and semiarid areas within the mainland
Using theoretical analysis and numerical calculation, the theoretical design framework is proposed, and the diffusion form and mechanism of moisture in this method are discussed. e treatment effect and applicability of this method are evaluated using an in situ immersion test
E elevation of the test site is 721.35–724.32 m according to geological survey data; the collapsibility grade of the site is grade IV, and the thickness of self-weight collapsible loess is greater than 15 m. e strata information from top to bottom is characterized in Tables 1 and 2. e specific gravity of the loess on the site is ds 2.7; the horizontal equivalent permeability coefficient is 0.751 × 10− 3 cm/s, and the vertical permeability coefficient is 1.840 × 10− 3 cm/s
Summary
Loess is a yellow sediment deposited during the transportation of Quaternary aeolian sand that is widely distributed in arid and semiarid areas within the mainland. There are some problems, such as the long immersion time, the soaked loess range, and the total water consumption, which are not conducive to effective control of the construction period and can affect the surrounding buildings and cause damage. Meng et al [15] studied the permeability law of water in unsaturated layered loess and backfill remolded loess by the in situ water immersion test, rainfall test, and water storage test Another focal point in the study of the preimmersion method is understanding the migration rule of soil water in the loess ground. Research on the physical mechanism of the preimmersion method in reducing loess ground collapsibility remains to be studied further; there are few research results from the perspective of a long immersion period, the soaked loess range, and the total water consumption. Using theoretical analysis and numerical calculation, the theoretical design framework is proposed, and the diffusion form and mechanism of moisture in this method are discussed. e treatment effect and applicability of this method are evaluated using an in situ immersion test
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