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以赞比亚穆利亚希北露天铜矿边坡为工程背景,基于颗粒流理论及PFC2D程序,将岩块和节理分别用颗粒体模型与光滑节理模型表征,构建含2条断续节理岩体及顺层断续节理岩质边坡模型,从细观力学角度深入研究其破坏过程中的力学机制。断续节理岩体破坏研究表明:岩桥破坏模式可划分为模式I、模式II、模式III–a和模式III–b破坏4类,且各类模式本质上均是以矿物颗粒间黏结张拉破坏为主的微破裂引起。顺层断续节理岩质边坡破坏研究表明:滑坡产生的微破裂主要从坡底断续节理端部开始产生,逐渐向坡体上部发展;滑体底部形态较为平直,而后部形态较为曲折并呈台阶状破坏;滑坡产生的破碎颗粒体先在边坡面中、下部产生,其体积相对较小,随后在边坡上部产生,其体积相对较大;在滑坡过程中,节理端部岩桥连线方向上的颗粒接触力较大,产生的微震事件强度与次数的关系近似服从正态分布函数。
Based on the Mulliabah northern open-air copper mine slope in Zambia, based on the particle flow theory and the PFC2D program, the rock mass and joint are characterized by the particle model and the slip-joint model, respectively. Stratified discontinuous jointed rock slope model, from the perspective of meso-mechanics in-depth study of its failure mechanism in the mechanical. The research on intermittent jointed rock mass destruction shows that the failure mode of rock bridge can be divided into four types: mode I, mode II, mode III-a and mode III-b. All kinds of modes are essentially tension-bonded by mineral particles Destructive micro-rupture caused. The study on the failure of rock slope with discontinuous jointed joints shows that the micro-fractures produced by landslides mainly originated from the discontinuous joints at the bottom of the slope and gradually develop toward the upper part of the slope. The shape of the bottom of the landslide is relatively straight while the shape of the rear part is rather tortuous And they are destructed stepwise. The broken particles generated by the landslide are firstly produced in the middle and the lower part of the slope, and their volume is relatively small, then they are generated in the upper part of the slope, and their volume is relatively large. During the landslide, The particle contact force in the direction of bridge connection is relatively large, and the relationship between the intensity of the microseismic event and the times approximates the normal distribution function.