Study on Shear Characteristics of Soil-rock Mixture-geotextile Interface
The reinforced structure of soil-rock mixture is commonly used in high-fill slope projects,and its stability is influenced by the interaction of the reinforcement-soil interface.In order to analyze the interaction mechanism of soil-rock mixture-geotextile interface,a series of direct shear tests were carried out by using large-scale direct shear apparatus.The effects of five kinds of rock content(0％,25％,50％,75％,100％),three kinds of compactness(88％,92％,96％)and three kinds of normal stress(100,200,300 kPa)on the interface shear characteristics were investigated,and the empirical formula of the interface dilatancy coefficient was established.The results show that the interface exhibits shear softening under the low rock content(0％-25％),but exhibits shear hardening and shear stress fluctuation obviously when the rock content is high(50％-100％).The larger the rock content and compactness,the larger the maximum vertical displacement of the interface,while the larger the normal stress,the smaller the maximum vertical displacement of the interface.The interfacial friction angle is basically stable under low rock content condition.With the increase of rock content,the interfacial friction angle first increases and then decreases.With the increase of compactness,the growth rate of interface apparent cohesion decreases.Combined with factors such as rock content and vertical stress,the empirical formula of dilatancy coefficient is established,which can accurately describe the volume change of interface.
NETL
NSTL
万方数据
维普
