尾矿坝变形细观力学机理的颗粒流数值模拟  

Simulation of the mesomechanics mechanism of the tailings dam's deformation with particle flow code

作　　者：张千贵[1,2] 王雅梦[3] 李广治[2] 尹光志[2] 王文松[2] 钟烨[1] 杨火海[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [2]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400030 [3]西南大学外语学院,重庆400000

出　　处：《重庆大学学报（自然科学版）》2015年第3期71-79,共9页Journal of Chongqing University

基　　金：国家自然科学基金青年科学基金资助项目(51304170);中国博士后科学基金资助项目(2014M560728);煤矿灾害动力学与控制国家重点实验室自主研究资助项目(2011DA105287-FW201203)~~

摘　　要：以新建四川省盐源县平川铁矿黄草坪尾矿库为工程背景,通过堆坝模型试验与室内土工试验,获得尾矿坝干滩面几何特征、颗粒分布规律及尾矿力学性质。基于离散元理论,采用PFC2D数值模拟软件进行双轴试验,与土工试验结果对比,得到尾矿细观力学参数,并分析尾矿坝颗粒接触力分布、颗粒位移与坝体结构变形特征。结果显示:1)初期坝中颗粒间接触力较大,形成的力链大致呈45°倾斜向上;坝体尾矿颗粒接触力随着埋深的增加而增大,在基岩凸起处接触力较大且集中。2)初期坝颗粒位移不明显,堆积坝少数尾矿颗粒沿坡面向下滚动,具有较大位移;尾矿堆积坝存在较为典型的滑移面,滑移面上部区域颗粒位移较大。3)初期坝结构变化不明显,尾矿堆积坝中靠近初期坝内坡面附近结构变形显著。A new tailings pond of Pingchuan iron Co.,Ltd.located in Yanyuan county of Sichuan province has been used for the project instance in this research.The dry slope＇s geometric features and particles＇ distribution rule of the tailings dam are obtained by a model test of building tailings dam,and so do themechanical properties of tailings by the soil test.Based on the discrete element theory,we obtain the mesomechanics parameters by comparing the results of biax test numerical simulation with PFC2 Dto the mechanical properties obtained by the soil test.Also the contact forces among particles,particles＇ motion and deformation characteristics of tailings dam model have been studied.The results clearly show that：1）There are some big and stable force chains in initial dam,and which directions are almost inclined upward with 45°.The particles＇ contact forces in subdam grow with the increase of depth,and the contact forces near the embossment point of bedrock are much bigger and more intensive than those in other area.2）The particles＇ motions in initial dam are insignificant.The motions of particles in subdam near the inner slope of initial dam are significant,which directions are almost upward along the inner slope of initial dam.Some particles in the surface of subdam tumble along the slope,which motions are much significant.There is a typical slip plane in subdam,and the motions of the particles above the slip plane are much obvious.3）The structural change of initial dam is small,but the structural deformation of subdam near initial dam＇s inner slope is much significant.

关 键 词：采矿工程 尾矿 离散元 颗粒流(PFC) 数值模拟 

分 类 号：TD32[矿业工程—矿井建设]