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Effects of seasonal water-level fluctuation on soil pore structure in the Three Gorges Reservoir,China

Journal of Mountain Science 2018年第10期15卷 2192-2206页

作者： ZHANG Shu-juan TANG Qiang BAO Yu-hai HE Xiu-bin TIAN Feng-xia LüFa-you WANG Ming-feng Raheel ANJUM Key Laboratory of Mountain Surface Process and Ecological Regulation Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China Sustainable Agriculture Sciences Department Rothamsted ResearchNorth WykeOkehamptonDevonEX202SBUK Abdul Wali Khan University Mardan 23200Pakistan

Inundation of the Three Gorges Reservoir has created a 30-m water-level fluctuation zone with seasonal hydrological alternations of submergence and exposure, which may greatly affect soil properties and bank stability. The aim of this study was to investigate the response of soil pore structure to seasonal water-level fluctuation in the reservoir, and particularly, the hydrological change of wetting and drying cycles. Soil pore structure was visualized with industrial X-ray computed tomography and digital image analysis techniques. The results showed that soil total porosity(? 100 ?m), total pore number, total throat number, and mean throat surface area increased significantly under wetting and drying cycles. Soil porosity, pore number and throat numberwithin each size class increased in the course of wetting and drying cycles. The coordination number, degree of anisotropy and fractal dimension were indicating an increase. In contrast, the mean shape factor, pore-throat ratio, and Euler-Poincaré number decreased due to wetting and drying cycles. These illustrated that the wetting and drying cycles made soil pore structure become more porous, continuous, heterogeneous and complex. It can thus be deduced that the water-level fluctuation would modify soil porosity, pore size distribution, and pore morphology in the Three Gorges Reservoir, which may have profound implications for soil processes, soil functions, and bank stability.

关键词： Soil pore structure X-ray computed tomography Image analysis wetting and drying cycles Water-level fluctuation Three Gorges

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Shrinkage Characteristics of Lime Concretion Black Soil as Affected by Biochar Amendment

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Pedosphere 2018年第5期28卷 713-725页

作者： WEI Cuilan GAO Weida William Richard WHALLEY LI Baoguo Key Laboratory of Arable Land Conservation (North China) Ministry of Agriculture Key Laboratory of Plant-Soil Interactions Ministry of Education College of Resources and Environmental Sciences China Agriculture University Rothamsted Research West Common

Studies have reported that biochar is a sustainable amendment that improves the chemical and physical properties of *** this study,an incubation experiment was conducted to investigate the effects of different application rates of biochar on the cracking pattern and shrinkage characteristics of lime concretion black soil after three wetting and drying *** derived from the corn straw and peanut shell mixture was applied to the soil at rates of 0,50,100,and 150 g kg^(-1)dry weight,representing the treatments T_(0),T_(50),T_(100),and T_(150),*** the wetting and drying cycles,the cracking pattern and shrinkage characteristics of the unamended and amended soil samples were *** of biochar significantly increased soil organic carbon content in the *** soil desiccation,biochar significantly reduced the rate of water *** propagated slowly and stopped due to the relatively higher water content in the soil applied with *** cracking area density(ρ_c),equivalent width,fractal dimension,and cracking connectivity index decreased during the drying process with increasing application rate of ***ρ_(c )value of the T_(50),T_(100),and T_(150) treatments decreased by 33.6%,52.1%,and 56.9%,respectively,after three wetting and drying cycles,whereas the T_(0) treatment exhibited a marginal *** coefficient of linear extensibility,an index used to describe onedimentional shrinkage,of the unamended soil sample(T_(0))was approximately *** of 100 and 150 g kg^(-1)biochar to the soil significantly reduced the shrinkage capacity by 41.45%and 45.54%,*** slope of the shrinkage characteristics curve,which indicates the ralationship between soil void ratio and moisture ratio,decreased with increase in the application rate of ***,compared with the T_(0) treatment,the proportional shrinkage zone of the shrinkage characteristic curve of the T_(50),T_(100),and T_(150) treatm

关键词： coefficient of linear extensibility soil cracking pattern soil moisture ratio soil shrinkage characteristic curve soilstructure soil void ratio wetting and drying cycles

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Theoretical study on stability evolution of soft and hard interbedded bedding reservoir slopes

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山地科学学报(英文) 2023年第9期20卷 2744-2755页

作者： WU Qiong ZHANG Bo TANG Hui-ming WANG di LIU Zhi-qi LIN Zhi-wei Faculty of Engineering China University of GeosciencesWuhan 430074China

Soft and hard interbedded bedding rock slopes,which is prone to failure,are widely distributed in the Three Gorges Reservoir,*** equilibrium method(LEM)is commonly used to analyze the stability of bedding rock slopes that have a single failure ***,this method cannot accurately estimate the stability of soft and hard interbedded bedding reservoir slopes because the strength parameters of a soft and hard interbedded rock mass vary spatially along the bedding plane and deteriorate with time due to periodic fluctuations of reservoir level.A modified LEM is proposed to evaluate the stability evolution of soft and hard interbedded bedding reservoir slopes considering the spatial variation and temporal deterioration of shear strength parameters of rock masses and bedding *** the modified LEM,the S-curve model is used to define the spatial variation of shear strength parameters,and general deterioration equations of shear strength parameters with the increasing number of wettingdrying cycles(WDC)are proposed to describe the temporal ***,this method is applied to evaluate the stability evolution of a soft and hard interbedded bedding reservoir slope,located at the Three Gorges *** results show that neglecting the spatial variation and temporal deterioration of shear strength parameters may overestimate slope ***,the modified LEM provides useful guidance to reasonably evaluate the long-term stability of soft and hard interbedded bedding reservoir slopes in reservoir area.

关键词： Soft and hard interbedded rock slope Limit equilibrium method Spatial variation wetting and drying cycles Plane failure Stability evolution

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