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采用自制原位剪切仪,对不同粗糙度、不同多花木蓝根系密度的基材土–岩接触面进行原位剪切试验,研究了基材土–岩接触面的剪切变形特征。研究表明,基材土–岩接触面剪切应力–位移具有典型的软化特性;受根系加筋、锚固作用影响,含根试样的剪切破坏面粗糙、破碎。根系作用对土–岩接触面峰值剪切强度、峰值剪切位移及残余剪切强度影响明显,对比发现,不同粗糙度下,相同根系面积比对提高界面峰值剪切强度的贡献率差异较小;根系面积比较小时,增强界面峰值剪切强度的贡献率低于粗糙度,随着根系面积比增大,根系提高界面强度的作用更为明显,其贡献率显著增加。
In-situ shear tests were conducted on the soil-rock interfaces of substrate with different roughness and different multi-tree root density using a home-made in-situ shear apparatus. The shear deformation characteristics of the soil-rock interface were studied. The results show that the shear stress-displacement of soil-rock contact surface has the typical softening characteristics. The shear failure surface of root-containing specimens is rough and broken due to the influence of root reinforcement and anchorage. The effect of root system on the peak shear strength, peak shear displacement and residual shear strength of soil-rock contact surface is obvious. It is found that the contribution of the same root area ratio to increasing the peak shear strength of the interface is smaller under different roughness When the area of root system is small, the contribution rate of increasing the peak shear strength of the interface is lower than that of the roughness. As the ratio of root area increases, the effect of increasing the interfacial strength of the root system becomes more obvious, and the contribution rate of the root system increases significantly.