Position: Home > Articles > Simulation of Morphological Development of Soil Cracks in the Collapsing Hill Region of Southern China
Research of Soil and Water Conservation
2016,23
(1)
338-342
华南活动崩岗崩壁土体裂隙发育规律试验研究
作 者：
周红艺;李辉霞;叶奇;吴国威
单 位：
佛山科学技术学院空间信息与资源环境系
关键词：
华南花岗岩;崩岗;土壤裂隙;模拟
摘 要：
为了研究崩壁裂隙发育对崩壁稳定性的影响,试验采集了广东德庆崩岗侵蚀区的崩壁不同部位土样,对其进行脱湿作用下的裂隙发育演变规律室内试验研究,试验中采用烘干法模拟脱湿过程,在脱湿过程中,定时定位对土样进行称重、拍照,以记录裂隙发育情况,利用ArcGIS软件对裂隙照片进行矢量化处理,提取裂隙的各种几何要素,进行裂隙度计算来分析裂隙发育情况。结果表明:不同部位土体裂隙发育程度达到相对稳定时的土壤含水量和时间不同,其中崩壁顶部(B1)土体最先产生裂隙和达到稳定状态,其次是中部(B2),最后是下部(B3);不同崩壁土体的裂隙面积密度、长度密度和连通性指数都随着含水率的减少而增大,达到最大值之后保持稳定,变化趋势一致。正是由于崩壁土体裂隙的发育程度不一,在到达稳定的时间和含水量的不同,从而导致崩壁土体各部位受力不均,土体强度产生差异,从而最终导致在雨季崩壁失稳而发生崩岗。
译 名：
Simulation of Morphological Development of Soil Cracks in the Collapsing Hill Region of Southern China
作 者：
ZHOU Hongyi;LI Huixia;YE Qi;WU Guowei;Department of Spatial Information and Resources or Environment,Foshan University;
关键词：
granite red soil region of Southern China;;collapsing hill;;soil cracks;;simulation experiment
摘 要：
The collapsing hill is a specific form of soil erosion in the granite red soil region of South China,especially in Guangdong Province.It is one of the most important indications of serious soil erosion.We reported regular changes on surface morphology of soil cracks with decreasing water in three different parts of soil body,the top of collapsing wall(B1),the middle of collapsing wall(B2),the bottom of collapsing wall(B3)through simulation experiments.In this study,we took overhead photos of the sample frame using a digital camera.The images were further processed by ArcGIS to quantificationally analyze the statistical law of crack morphology.Meanwhile,a dynamic description method based on normal distribution was proposed to depict the morphology of shrinkage cracks on soil surface.It showed that crack area density,length density,and connectivity index all increased with decrease of moisture content and remained stable after reaching their maximums,but the time to reach their maximums and the soil moisture after reaching their maximums varied in different parts of soil body.Cracks were first developed in B1 speciment,and then in B2,and finally in B3,and the same order was found in reaching their stability.Crack area density of B1 specimen was the biggest compared with those of B2 and B3specimen throughout the drying process.The difference in crack development,the time to reach stability,and soil moisture content will result in uneven load-carrying in different parts of soil body in collapsing wall,and finally result in collapsing hill in rainy season.
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