Slope Crack Propagation Law and Numerical Simulation of Expansive Soil under Wetting–Drying Cycles
Slope Crack Propagation Law and Numerical Simulation of Expansive Soil under Wetting–Drying Cycles
复制标题
干湿循环下膨胀土边坡裂缝扩展规律及数值模拟
DOI：
10.3390/su15075655
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发表时间：
2023-03
期刊：
影响因子：
3.9
通讯作者：
Xuanyi Chen;X. Jing;Xiaoshuang Li;Junji Chen;Qiang Ma;Xiaohua Liu
中科院分区：
文献类型：
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作者：
Xuanyi Chen;X. Jing;Xiaoshuang Li;Junji Chen;Qiang Ma;Xiaohua Liu
通过室内大型干湿循环边坡试验，研究了干湿循环条件下膨胀土边坡裂缝的扩展规律及裂缝对边坡的影响。利用含水率传感器监测了干湿循环过程中不同深度土壤含水率的变化，利用裂缝深度探测仪测量了干燥过程中膨胀土裂缝深度的变化。采用自行编制的二值化程序对边坡表面裂缝进行处理，分析了膨胀土干燥过程中裂缝的演化机理。通过对裂隙土中含水量变化的分析，得到含水量变化对膨胀土的影响规律，并分析了地表土的干湿循环破坏模式。通过二值化处理对土壤表面裂缝进行量化，计算出裂缝面积和裂缝面积与原状土面积的比值。最后利用PFC软件以边坡裂缝和定量分析结果为参数进行模拟，证实干湿循环次数越多，裂缝数量越多，对边坡的破坏越大。
This study investigated the crack propagation law of expansive soil slopes under drying–wetting conditions and the influence of cracks on slopes by conducting a large-scale indoor slope test subjected to drying–wetting cycles. The change in soil moisture content at different depths during the drying–wetting cycles was monitored using a moisture content sensor, and the variation in crack depths in the expansive soil during the drying process was measured using a crack depth detector. The cracks on the slope’s surface were processed using a self-made binarization program, and the crack evolution mechanism of the expansive soil during the drying process was analyzed. The rainfall-induced change in moisture content in the fractured soil was used to obtain the influence of moisture content change on expansive soils, and to analyze the dry–wet cycle failure mode of surface soil. The surface cracks of the soil were quantified by binary processing, and the area of the cracks and the area ratio of cracked soil to intact soil were calculated. Finally, by using PFC simulation software with the slope cracks and quantitative analysis results as parameters, it was confirmed that the greater the number of drying–wetting cycles, the greater the number of cracks, and the greater the damage to the slope.