三维物理模型在长臂采煤工作面采空区通风研究中的应用(英文)

Application of 3-D physical model in coal mine longwall gob ventilation research

煤矿长臂工作面采空区中的风流分布对危险区域识别起到重要作用,并且受到上覆岩层垮落效果和井下通风方式影响巨大。为了探究U型通风工作面采空区中风流分布,在相似比为1∶300的物理模型中开展了实验研究。该物理模型主要由4部分组成:开采系统、由相似模拟材料堆砌的上覆岩层、通风系统和数据采集系统。随着模型开采和上覆岩层垮落,在采空区形成后引入示踪气体。通过预埋的监测管路测试模型中示踪气体在各点的浓度,从而得到示踪气体浓度分布图。该实验平台和研究方法通过相似材料和模拟开采系统可以获取较为合理的物理上覆岩层和长臂采空区模型。通过示踪气体手段可以得到可视化的采空区风流分布。通过改变通风方式,该系统可应用于针对其他不同通风条件下采空区风流状况研究。

Distribution of air movement inside the longwall gob plays an important role in identifying zones of potential hazards and it is largely governed by the overburden caving process and ventilation pattern. In order to gain a good understanding of the air movement in longwall gob with a U-ventilation system, experimental studies have been conducted on a 1 ： 300 scale 3-D physical model. The physical model consists of four parts ： mining system, overburden strata constructed with simulant materials, venti- lation system and data acquisition system. As the strata subside with mining progress on the physical model, tracing gas is introduced in the intake entry after the gob was formed. Tracing gas concentrations in the gob are measured at multiple pre-installed sampling points for generating the distribution map of the tracing gas in gob. This experiment platform and method can obtain a rational physical overburden and longwall gob model using the simulant material and build-in mining system. Based on the tracing gas approach ,this experiment enables the visualization of flow pattern in longwall gob in later mining stage. With the flexibility of ventilation arrangement, this platform can be further developed for research under other ventilation scenarios.