Effects of Root System and Fissure Angle on In-situ Shear Characteristics of Substrate

doi:10.13961/j.cnki.stbctb.20210316.001

Home > Archive>Volume 41, Issue 2, 2021 >51-57. DOI:10.13961/j.cnki.stbctb.20210316.001

Effects of Root System and Fissure Angle on In-situ Shear Characteristics of Substrate
DOI:
                        10.13961/j.cnki.stbctb.20210316.001
                    
Author:
                        Li ZijuanLi Zijuan
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, Yichang, Hubei 443002, China
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Xia ZhenyaoXia Zhenyao
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, Yichang, Hubei 443002, China;Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University), Ministry of Education, Yichang, Hubei 443002, China
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Zhang LunZhang Lun
Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University), Ministry of Education, Yichang, Hubei 443002, China
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Gao FengGao Feng
Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University), Ministry of Education, Yichang, Hubei 443002, China
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Shen YitongShen Yitong
Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University), Ministry of Education, Yichang, Hubei 443002, China
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Yang YueshuYang Yueshu
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, Yichang, Hubei 443002, China;Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University), Ministry of Education, Yichang, Hubei 443002, China
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Xiao HaiXiao Hai
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, Yichang, Hubei 443002, China;Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University), Ministry of Education, Yichang, Hubei 443002, China
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Xia DongXia Dong
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, Yichang, Hubei 443002, China;Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University), Ministry of Education, Yichang, Hubei 443002, China
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Xu WennianXu Wennian
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, Yichang, Hubei 443002, China;Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University), Ministry of Education, Yichang, Hubei 443002, China
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Clc Number:TU411.7
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Abstract:

[Objective] The effects of rock fissure angle on the in-situ shear characteristics of the base material under different plant root systems were studied, in order to provide a scientific reference for water and soil conservation and ecological restoration.[Methods] The samples were cured for 90 days under three conditions:plant-free, bermudagrass and multi-flowered magnolia. The in-situ shear test of the substrate was carried out under the angle of 15°, 30°, 45°, 60°, 75° and 90° between the rock crack and the vertical direction of shear.[Results] ①The shear strength and residual shear strength of bermudagrass and magnolia root-substrate composites were significantly greater than those of non-rooted substrates. The average increase in shear strength was 33.87%-65.18% and 44.94%-73.65% respectively. ② The shear strength of samples without plant substrate reached the peak value when the displacement was 8-11 mm, while the bermudagrass root-substrate composite and the multifloral magnolia root-soil composite reached the peak value when the displacement was 20-36 mm. The root system could lag the peak displacement of the vegetation concrete, and root-containing substrate sample could withstand greater deformation. ③ For the same plant, different distribution of rock fissures had different effects on the soil consolidation ability of the root system. As the fissure angle increased, its shear strength increased first and then decreased. When the fissure angle was 60°, its shear strength reached maximum.[Conclusion] The root system can significantly enhance the shear strength of the vegetation concrete substrate and increase the residual shear stress. The distribution of different cracks has different effects on improving the shear strength of the substrate, but the effect of crack distribution on residual shear strength is not obvious.

Key words:in-situ shear;root-substrate composite;crack angle;shear strength;soil consolidation and slope protection

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李紫娟,夏振尧,张伦,高峰,沈已桐,杨悦舒,肖海,夏栋,许文年.根系及裂隙角度对基材原位剪切特性的影响[J].水土保持通报英文版,2021,41(2):51-57

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Received:September 28,2020
Revised:November 25,2020
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Online: May 21,2021
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