Experimental Study on the Influence of Water Content on the Shear Strength of Root-Soil-Rock Composite——A Case Study of Malus halliana
[Objective]The aim of this study is to investigate the effect of water content on the shear strength of root-soil-rock composite.[Method]This study was conducted on Malus halliana,a typical slope stabilization plant on the Laoban Mountain of Yaan campus,Sichuan Agricultural University.Five gradiants of water content(10%,15%,20%,25%,30%)were set on a fixed shear surface with root content of 0.2%and stone content of 30%.Direct shear tests were carried out with four different normal stresses of 50,100,150 and 200 kPa.The influence of water content on the shear strength and its in-dexes(cohesion and internal friction angle)were analyzed.[Result]The shear strength of the root-soil-rock composite increased with the rising of normal stress,suggesting adherence to the Mohr-Coulomb strength criterion.Additionally,the shear strength of the composite decreased first,then increased and followed by a decrease with the increase of water content,characterized by a multi-peak curve pattern with a minimum value observed at 20%water content.The cohesion of the root-soil-rock composite was affected by the water content significantly,and reaching a critical peak at 25%.In contrast,the internal friction angle of the root-soil-rock composite showed minimal variation with changing water content.[Conclusion]The change of water content primarily affects the cohesion of the root-soil-rock compos-ite,and thus influence the peak shear strength while having minimal impact on the internal friction angle.The findings of this study could provide theoretical support for the reinforcement of soil-rock mixture slope through vegetation.
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