摘要
界面广泛存在于实际环境中,是灾害发生及结构失稳的关键之处。为了研究不同界面与砂体接触面间的力学性质,得出应力效应产生的原因,开展了不同法向压力下砂体与不同材料(木板、混凝土、有机玻璃、铝板)间的界面剪切试验,阐述了各界面的摩擦因数和应力应变曲线间的差异,结合剪切后的界面微观形貌和相关理论分析了应力效应的产生。结果显示,木板、混凝土、有机玻璃、铝板与砂体间的摩擦因数是依次减小的,分别为0.553、0.489、0.422、0.374;界面剪切应力应变曲线中,稳定剪应力出现时所需的应变随法向应力呈线性增加;法向应力不同时,颗粒受剪运动方式不同,小法向应力下,颗粒受剪切易于沿界面进行滑动,而在大的法向应力下,颗粒受剪切则易于沿界面发生滚动,这便引起了应力效应。
Interfaces are widely present in nature and are critical to the occurrence of disasters and structural instability.In order to study the mechanical properties between different interfaces and sand body contact surfaces and answer the reasons for stress effects.The interface shear tests between sand bodies and different materials(wooden board,concrete,organic glass,aluminum plate)under dif-ferent normal pressures were conducted,and the differences in friction coefficients and stress-strain curves of each interface were ex-plained.Combined with the microstructure of the interface after shear and relevant theories,the stress effect was analyzed.According to the results,the friction coefficients between the wooden boards,concrete,organic glass,aluminum plate and the sand decrease in order,which are 0.553,0.489,0.422,0.374,respectively.The strain required for stable shear stress to occur in the interface shear stress-strain curve increases linearly with normal stress.When the normal stress is different,the particle motion mode during shearing is differ-ent.Under small normal stress,the particles are easy to slide along the interface,while under large normal stress,the particles are easy to roll along the interface,which causes stress effects.
作者
吴可
李雨晨
王鑫宇
Wu Ke;Li Yuchen;Wang Xinyu(Shaanxi Polytechnic University,Xianyang 712000,China)
出处
《能源与环保》
2025年第8期275-280,共6页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
陕西工业职业技术大学科研基金资助项目(2025YKYB-028)。
关键词
界面剪切
摩擦因数
应力效应
运动方式
interface shear
friction coefficient
stress effect
motion modes
