水土保持研究2025，Vol.32Issue(3)：180-187,8.DOI:10.13869/j.cnki.rswc.2025.03.005
直剪剪切方式对崩岗土体边坡稳定性的影响
Impact of direct shear methods on the stability of Benggang slope
摘要
Abstract
[Objective]This study investigates the differential impact of various direct shear methods on the shear resistance performance of Benggang soil and slope stability,aiming to provide scientific evidence for slope management.[Methods]Different direct shear tests were used to measure shear strength parameters,and FLAC3D software was employed to simulate slope stability changes under various shear conditions for a comprehensive analysis of the mechanical effects of each direct shear method.[Results](1)Maximum shear stress response under slow shear conditions:in the slow shear test,the shear stress in the red soil layer surged to 197.9 kPa under a 400 kPa load,indicating its high potential for strength increase under slow shear conditions.(2)Sensitivity of shear strength to shear methods:the red soil layer is more sensitive to shear methods compared to the transition layer.Under the slow shear test with a 400 kPa load,the shear strength reached 194.547 kPa,higher than the transition layer's 182.37 kPa.Consolidated quick shear significantly affected the internal mechanical properties of the soil,such as internal friction angle and cohesion.(3)Slope stability analysis:slow shear not only resulted in a low safety factor(FS=3.18),but also led to large shear strain increments and extensive deformation areas,making this shear method the least stable shear method.The X-axis stress on the Benggang slope was directed towards the slope face,peaking at approximately 22 kPa.Displacement under all shear methods initially increased and then decreased.However,the magnitude and direction of displacements in the consolidated quick shear test differed from those in other tests,showing a large displacement towards the outside of the slope.The Y-axis stress decreased with increasing depth,and the shear stress variation was particularly significant under slow shear conditions.[Conclusion]Under different direct shear methods,although the absolute difference in shear strength is not significant,the internal friction angle and cohesion differed considerably.Numerical simulation indicates that the slow shear condition poses the greatest challenge to the stability of Benggang slopes.关键词
直剪方式/FLAC3D/稳定性/边坡/崩岗Key words
direct shear method/FLAC3D/stability/slope/Benggang分类
农业科学引用本文复制引用
李斯萱,张晓明,赵艺,郭晓亮..直剪剪切方式对崩岗土体边坡稳定性的影响[J].水土保持研究,2025,32(3):180-187,8.基金项目
国家自然科学基金(41771307 （）
41201271) （）
生产建设项目中水文数据筛选新技术(20212614C03) （20212614C03）
