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[1]AI Shangjin,CHENG Hu,XIA Lu,et al.Micromorphological Characteristics and Stability of Different Soil Layers of Collapsed Wall in Southeastern Hubei Province[J].Research of Soil and Water Conservation,2022,29(05):382-390.

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Micromorphological Characteristics and Stability of Different Soil Layers of Collapsed Wall in Southeastern Hubei Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 05 Page number: 382-390 Column: Public date: 2022-08-20

Title:: Micromorphological Characteristics and Stability of Different Soil Layers of Collapsed Wall in Southeastern Hubei Province

Author(s):: AI Shangjin^1,2,3, CHENG Hu^1,2, XIA Lu^1,2, MA Yueyang^1,2, SHU Qian^1,2, XU Wennian^1,2, XIA Dong^1,2,3,4; (1.Hubei Provincial Engineering Research Center of Slope Habitat Construction Technique Using Cement-based Materials, China Three Gorges University, Yichang, Hubei 443002, China; 2.Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang, Hubei 443002,China; 3.College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, Hubei 443002,China; 4 Key Laboratory of Urban Land Resources Monitoring and Simulation, Ministry of......)

Keywords:: collapsed wall; stability; soil micromorphological; principal component analysis; minimum dataset(MDS)

CLC:: S152.2

DOI:: -

Abstract:: In order to gain a deeper understanding of the microstructural characteristics and stability conditions of the soil layers at different depths of the crumbling wall, a well-developed crumbling wall in Tongcheng County in southeast of Hubei was selected as the research object, and the micromorphological characteristics of the soil layers at six different depths of the crumbling wall were quantitatively and qualitatively analyzed by observing the soil thin sections, and on this basis, the stability of the crumbling wall was evaluated by using principal component analysis, and the minimum micromorphological indexes of the crumbling wall stability evaluation system were constructed. The results showed that:(1)the micromorphology of soil layers at different depths of the crumbling wall differs significantly; the soil matrix color of the topsoil layer shows dark red color, high matrix ratio(0.91), mature development of agglomerates and pore condition, and good pore connectivity; the tone of matrix color of the laterite layer is red, and gradually becomes lighter with increasing depth, the red soil layer has a matrix ratio of 0.69(mean), a weakly developed soil aggregate structure, pore type dominated by cystic pores and fissures, and poor connectivity; the sandy soil layer is mainly composed of mineral particles that have not weathered completely, with a very low matrix ratio(0.25), and the pore type is mainly the interstitial space between the mineral particles;(2)the evaluation scores of stability micromorphology of each soil layer decrease in the order: topsoil layer(TC₁)>laterite layer(TC₂>TC₃>TC₄)>sandy soil layer(TC₅>TC₆), which shows the significantly positive correlation with most soil micromorphology indicators(p<0.05);(3)the minimum data set(MDS)for microform evaluation of crumbling wall soil stability consists of seven indicators: soil matrix color, soil matrix type, soil matrix ratio, soil agglomerates, soil structural body, total pore percentage and organic matter content. From what has been discussed above, the difference in micro-morphological characteristics of soil layers at different depths is one of the important factors for the stability of crumbling wall soils with hierarchical differentiation. Based on the soil micromorphology analysis and the established minimum data set evaluation system, the stability of different soil layers of the crumbling wall can be preliminarily monitored.

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Last Update: 2022-08-20