Effects of dry-wet cycle on the disintegration performance of yellow brown soil under acidic conditions
XIAO Hai1,2, ZHU Zhien1, LI Zijuan1, ZHANG Lun1, GUO Ping1, LI Mingyi1, YANG Yueshu1,2, XIA Zhenyao1,2
1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, 443002, Yichang, Hubei, China; 2. School of Civil Engineering & Architecture, China Three Gorges University, 443002, Yichang, Hubei, China
Abstract：[Background] China has become the third-largest acid rain area after Europe and North America due to the increasingly serious air pollution. The magnitude of the impact of acid rain on the soil is directly related to the quality of the entire ecological environment, and many useful results have been obtained. The individual effect of dry-wet cycle or acidity on the physical and chemical properties of soil have been widely investigated. However, there is limited studies on their combined effects on soil disintegration performance, despite the soil may suffer dry-wet cycle under acidic condition in nature.[Methods] The yellow-brown soil, a typical soils in the Three Gorges Reservoir area, was collected from Yichang as the research object. In the laboratory, the collected soil samples were broken up gently with hands into small clods, by following their natural structures, to pass a five mm sieve; and then the impurities, such as pebbles, were manually removed, and air-dried for further use in the research. Four acidities (pH=3, pH=4, pH=5 and pH=7 refer to extremely strong acid rain, strong acid rain, weak acid rain and no acid rain condition, respectively) combined with eight dry-wet cycles (0, 1, 2, 3, 4, 5, 10 and 15 times) were set for this research. And the disintegration test was carried out after pretreatment. The duration of the disintegration experiment was 20 min or stopped until all the soil was disintegrated. The effect of dry-wet cycle on the soil bulk density, disintegration stability time and disintegration index under acidic conditions were compared and evaluated.[Results] 1) The bulk density gradually increased with increasing in the number of dry-wet cycle or the acidity of the acid solution until reaching a maximum, and then it levelled off. The stronger the acidity, the more serious the damage to the soil structure, resulting in the increasing of soil bulk density. The influence of the acidity on the bulk density gradually stabilized with the increase of the number of dry-wet cycles. 2) The disintegration process curve of yellow-brown soil showed a typical "S-shape" with three stages including the slow disintegration stage, absorption-exponential disintegration stage and disintegration completion stage. 3) The disintegration stability time prolonged by nearly double while the maximum disintegration index dropped by nearly 30% after 15 times of acid drying-wet cycle. The maximum disintegration index of yellow-brown soil had an increasing trend followed a gradually reduction with the increase of the number of dry-wet cycles, while had a decreasing trend followed a gradually increment with the increase of the acidity of the acid solution. 4) The dry-wet cycle and acidity had a significant impact on the bulk density and disintegration of yellow-brown soil, and the contribution of dry-wet cycle effect was more than those of acidity and their combined effect.[Conclusions] The disintegration performance of yellow-brown soil demonstarted obvious change due to dry-wet cycle under acidic condition. The research may strengthen the understanding of the disintegration properties of yellow-brown soil.
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2023, Vol. 21 
