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Effects of soil shrinkage in permanent gullies formation: The case of benggang erosion in the granite area of southern China

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Journal of Mountain Science 2021年第9期18卷 2328-2344页

作者： HUANG Wan-xia DENG Yu-song CAI Chong-fa JIANG Dai-hua Forestry College Guangxi UniversityNanning 530004China Resources and Environment College Huazhong Agricultural UniversityWuhan 430070China Agricultural College Guangxi UniversityNanning 530004China

Soil shrinkage is an important factor in slope destabilization in granitic areas, which is also one of the most important conditions for the formation of permanent gullies. This study explored the effect of soil shrinkage on permanent gullies, and benggang erosion in granitic areas in southeastern China was used as an example. Three types of benggang in granitic area were selected to examine the soil shrinkage of three soil layers(the lateritic, transitional and sandy layers) and their effect on the development of benggang erosion was studied. The results show that the maximum values of COLEH and COLEV(coefficient of linear extensibility in horizontal and vertical directions, respectively) are 3.09% and 1.60% in the laterite layers, 2.71% and 2.13% in transition layers, and 1.10% and 1.82% in sandy layers, indicating that the shrinkage potential of the soil layers exhibits the following order, from highest to lowest: the laterite layer, transition layer, and sandy layer. With a decreasing volumetric water content, the linear shrinkage ratio increases gradually and eventually stabilizes, and in the laterite, transition and sandy layers, the average values of the maximum linear shrinkage are 1.50%, 2.09%, and 1.74%, respectively. Axial shrinkage is most obvious in the transition layers, in which the volume change in the form of subsidence is greater than that in other layers. The soil shrinkage curves fit the trilinear model(R2>0.9), and the soil shrinkage characteristic curves were divided into structural, basic, and residual sections. The correlation analysis shows that the soil shrinkage rate is positively correlated with clay and Fe2 O3 content and negatively correlated with sand content. Clay and sand contents are the most important factors influencing soil shrinkage. Soil oxides can influence soil shrinkage by affecting the particle composition of the soil, so soil shrinkage is closely related to soil clay minerals. Our findings can provide a theoretical basis f

关键词： Soil shrinkage Permanent gully Granite benggang Soil layers

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Influence of crack characteristics on the morphological development of benggang and hydrological processes

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Journal of Mountain Science 2023年第7期20卷 1900-1910页

作者： LIU Wei-ping WANG Shu-han TIAN Si-wen OUYANG Guo-quan HU Li-na YUAN Zhi-jun School of Civil Engineering and Architecture Nanchang UniversityNanchang 330031China

benggang is a special type of soil erosion,which widely distributes in the granite residual soil area of southern *** to the influence of local climate and topography,shallow cracks having different morphological characteristics are easily formed on the slope *** shallow cracks damage the surface structure of the slope and accelerate water infiltration,making it easier to cause severe soil and water ***,the mechanism of benggang process is still unclear,especially for slopes with different shallow crack *** this study,granite residual soil was collected from Benngang erosion area in Yudu County,Jiangxi Province,southern *** experimental treatments with slope surface crack rates of 0%,5.23%,and 11.70%were *** monitoring of moisture content and soil temperature in the slope were carried out during rainfall,and the characteristics of preferential flow were monitored with different crack *** development and evolution process of benggang with different crack rates were *** show that high surface crack rate of the shallow surface on the slope accelerated the development of shallow gully erosion,leading to premature occurrence of gully *** the shallow crack rate increased from 0%to 5.23%and 11.70%,the width-depth ratio of the rills at the slope bottom increased from 0.69 to 1.02 and 1.16,*** the same time,a correlation between moisture and temperature data was observed for the process of water-heat coupled *** upper soil temperature of slope decreased quickly due to preferential *** simultaneous monitoring of soil moisture and temperature can effectively track preferential flow and indicate the water *** data was a more sensitive indicator of the seepage paths of preferential flow compared to moisture data.

关键词： Granite residual soil benggang Crack characteristics Preferential flow

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Effect of gravel content on the detachment of colluvial deposits in benggang

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Journal of Mountain Science 2022年第11期19卷 3088-3104页

作者： ZHANG Li-ting SHUAI Fang CHEN Li-bo HUANG Yan-he LIN Jin-shi ZHANG Yue GE Hong-li JIANG Fang-shi Jinshan Soil and Water Conservation Research Center Fujian Agriculture and Forestry UniversityFuzhou 350002China

Accurately calculating detachment capacity is the most fundamental issue when establishing a soil erosion process *** deposits of benggang are typical soil-gravel mixtures,whereas the understanding of the soil detachment of colluvial deposits is *** work investigated the effects of the gravel contents on the soil detachment capacity of colluvial deposits and its hydrodynamic *** colluvial sample was collected in Anxi County,Fujian Province,Southeast China,and a small-sample scouring test was *** slope steepness ranged from 18%to 84%,unit discharge ranged from 0.56×10^(-3)to 2.22×10^(-3)m^(2)s^(-1),and gravel content ranged from 0%to 70%.The results indicated that the gravel content is the primary factor that influences the detachment capacity,followed by the discharge and then the *** detachment capacity trend with the gravel content varied over different slopes and *** power represents the best hydrodynamic parameter for modelling the detachment capacity of colluvial deposits and can be used to establish a fitting equation for the colluvium together with the mean weight diameter(MWD)(Nash-Sutcliffe efficiency(NSE)=0.96).As the gravel content increased,the soil erodibility parameters increased several folds,in some cases more than 10 folds,mainly because the soil shear strength decreased ***,as the gravel content increased,the gravel specific surface area increased,the obstruction of gravel to runoff increased,and the energy needed for runoff to overcome gravel obstruction increased,leading to 2-3 folds higher critical shear stress of runoff for soilgravel mixtures compared with pure *** summary,gravel can influence the detachment capacity by changing the soil properties,and the gravel content also affects the relationship between soil detachment capacity and the hydrodynamic *** findings deepen the understanding of the influence of gravel on soil erosion and provide a basis for

关键词： Hydraulic erosion Hydrodynamics Gravel content Soil detachment Erosion resistance benggang

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Effect of the moisture content and dry density on the shear strength parameters of collapsing wall in hilly granite areas of South China

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International Soil and Water Conservation Research 2024年第3期12卷 697-713页

作者： Xiaoyang Wang Xiaoxing Qin Jiahao Tan Linxi Yang Lixing Ou Xiaoqian Duan Yusong Deng Guangxi Key Laboratory of Forest Ecology and Conservation College of ForestryGuangxi UniversityNanning530004China Guangxi Key Laboratory of Agricultural environment and Agricultural products safety College of AgricultureGuangxi UniversityNanning530004China

The changes in the mechanical properties of collapsing walls under the influence of natural factors in the hilly area of southern China need to be *** systematically studied the influence of the interaction of dry densityρ(1.0,1.1,1.2,1.3,1.4 g/cm3)and moisture content w(0.05,0.1,0.15,0.2,0.25 g/g)on the stability of four soil layers in a collapsing *** soil cohesion decreased with increasing soil *** cohesion force initially increased and then decreased with increasingωand increased with increasingρ;the internal friction angle was mainly affected byωand decreased with increasingω.The cohesion could be used to effectively characterize the stability of the collapsing *** shear strength index was modeled based on interaction between the dry density and moisture content(R2>0.95).The optimal combination of moisture content and dry density was obtained,and the collapsing wall was in the most stable state at a moisture content of 0.12-0.19 g/g and a dry density of 1.40 g/*** on the analysis of the critical height and safety factor(FS),the FS values of the sandy layer(C)was 0.53 and 0.57 forωvalues of 0.25 g/g and 0.05 g/g,*** the alternating process of soil wetting and drying,the basic properties of the soil changed;caused traceback erosion,and thereby affected the stability of the collapsing *** study provides a theoretical basis for the investigation of the factors influencing the stability of collapsing walls.

关键词： benggang Shear strength Cohesion force Internal friction angle Safety coefficient

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