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王华煜¹ , 张红 日^2,3 , 王桂尧¹ , 邓人睿¹ , 杨颜齐¹

 

(1. 长沙理工大学 土木工程学院 , 长沙   410076; 2. 广西交科集团有限公司 , 南宁    530007;

3. 上海交通大学 土木工程系 , 上海   200240)

摘  要: 为研究膨胀土边坡在反复降雨日晒作用下的破坏情况 , 以广西崇左市中膨胀土和强膨胀土为研究对象 , 通过降雨喷头和光照系统模拟反复降雨日晒循环 , 开展室内边坡模型试验 , 探究干湿循环作用下膨胀土边坡含水率变化规律和裂隙发展规律 。试验结果表明 : 干湿循环作用下 , 边坡浅层含水率变化程度相较深层更为剧烈 , 且干湿循环次数越多 , 其含水率变化越剧烈 , 浅层土所受影响大于深层土 ; 强膨胀土对干湿循环下含水率变化更为敏感 , 其含水率的峰谷值差距相较中膨胀土更大 ; 被降雨冲刷下的土颗粒粒径随干湿循环次数的增加而增大 , 裂隙深度加深 ; 强膨胀土边坡在干湿循环作用下裂隙发展程度比中膨胀土边坡更深 , 强膨胀土边坡更易发生浅层滑坡 。研究为膨胀土边坡在干湿循环作用下含水率变化和裂隙变化情况提供参考。

关键词: 干湿循环 ; 膨胀土 ; 裂隙 ; 含水率 ; 边坡 ; 模型试验

中图分类号: TU411. 93      文献标志码: A      文章编号: 1005-8249 (2026) 04-0092-08

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 014

 

The Variation of Moisture Content and the Development Law of Fractures in Expansive Soil Slopes

WANG Huayu¹ , ZHANG Hongri^2,3 , WANG Guiyao¹ , DENG Renrui¹ , YANG Yanqi¹

(1. School of Civil Engineering , Changsha University of Science & Technology, Changsha 410076, China;

2. Guangxi Transportation Science and Technology Group Co. , Ltd. , Nanning 530007, China;

3. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

Abstract : In order to study the damage of expansive soil slopes under repeated rainfall and solarization, we take the middle expansive soil and highly expansive soil in Chongzuo City, Guangxi, as the research object, simulate the repeated rainfall and solarization cycles through rainfall nozzles and light systems, carry out indoor slope modeling experiments, and investigate the change rule of water content and the rule of fissure development of the expansive soil slopes under the action of wet-dry cycling.

The test results show that : under the action of wet-dry cycling, the degree of change of water content in the shallow layer of the slope is more intense compared with that in the deep layer, and the more the number of wet-dry cycling, the more intense the change of water content, and the shallow soil is more affected than that in the deep layer of the soil; the highly expansive soil is more sensitive to the change of water content under the wet-dry cycling, and the difference between the peaks and valleys of the water content is bigger compared with that in the moderately expansive soil; the grain size of the soil particles washed away by the rainfall is increased with the increase of wet-dry cycling, and the depth of fissure is deepened; the particle size of the soil particles washed away by the rainfall is increased with the increase of wet-dry cycling, and the depth of fissure is deepened; the depth of fissure is deepened with the increase of wet-dry cycling. The particle size of soil particles washed by rainfall increased with the number of wet-dry cycling, and the depth of fissures deepened; the degree of fissure development of highly expansive soil slopes under the action of wet-dry cycling was deeper than that of moderately expansive soil slopes, and highly expansive soil slopes were more susceptible to shallow landslides. This study provides a reference for the change of water content and the change of cleavage under wet-dry cycling of expanded soil slopes.

Key words: wet-dry cycles; expansive soils; crack; water content; slopes; modeling test