深凹露天矿采场内流场分布规律的试验与数值模拟

运用现场测试和数值模拟相结合的方法，对深凹露天矿采场内的流场分布规律进行研究.以首钢水厂铁矿为试验矿山，在5个现场试验点观测不同垂直高度的风向、风速.现场测试结果表明，当风速为1~2m/s时，西南和东北方向的来流风进入采场内均形成复环流结构；当风速达到47m/s及更大时，5个测点风向与来流风向相同，未观测到采场内形成复环流结构.同时基于Gambit技术建立矿体的几何模型，应用流体力学Fluent软件对该深凹露天矿在不同风速条件下的流场分布进行数值模拟.模拟结果表明，随着风速的增加，矿区内复环流中心的位置逐渐升高，范围宽度和中心厚度也逐渐增大.数值模拟结果与现场测试结果相似.

Numerical Simulation and Experimental Study on Distributions of Flow Field in Stope of Deep Sunken Open Pit Mines

The site test and the method of numerical simulation were combined together to study the distribution of flow field in deep sunken open pit mines. Based on actual situation of the mine， five site test points are required for the experiments in Shougang Shuichang Iron Mine to observe wind direction and wind speed of different vertical height. According to the site observation results， it shows that when the wind speed ranges from 1m/s to 2m/s， the coming wind goes into the stope from both southwest and northeast and form recombination circulation structure; when the wind speed reaches to 47m/s or even bigger， the wind direction of the five site test points is same with the direction of the coming wind， no recombination circulation has been observed in the stope. Furthermore， the geometrical model of orebody was established on the basis of Gambit technology， and the distributions of flow field of deep sunken open pit mines in different wind speed conditions were separately simulated by applying Fluent software. The simulation results show that， as the wind speed increases， the location of the local recombination circulation center increases gradually， meanwhile， so are the width of the range and the thickness of the center. The simulation results of dust mass concentration are in agreement with the site test results.