CAJ | 학술논문

为了建立能够表征煤体真实孔隙结构的数字模型，进而进行数值模拟研究，通过μCT225kVFCB高精度CT系统扫描得到了大柳塔煤矿长焰煤CT数据，可观测到的最小孔隙直径为1.94μm。使用基于Matlab语言的三维重建程序结合逆向工程技术，提出了一种将煤体CT三维数据转换为CAD数字模型的方法。以Ansys建立的煤体有限元模型为例，对煤体瓦斯渗流进行了模拟，分析了煤体孔隙内的速度及压力分布规律，并计算了沿 X、Y、Z 方向的渗透系数。计算结果表明：在微观尺度下（<100μm）煤体渗透系数呈现各向异性，其受煤体结构的影响较明显。提出的基于CT三维重建结合逆向工程技术构建的煤体CAD数字模型不仅可进行有限元分析，同时也可以被EDEM等离散元分析软件所使用，拓宽了煤体CT三维数据的应用范围，丰富了煤体在微观尺度上的研究方法。
위료건립능구표정매체진실공극결구적수자모형，진이진행수치모의연구，통과μCT225kVFCB고정도CT계통소묘득도료대류탑매광장염매CT수거，가관측도적최소공극직경위1.94μm。사용기우Matlab어언적삼유중건정서결합역향공정기술，제출료일충장매체CT삼유수거전환위CAD수자모형적방법。이Ansys건립적매체유한원모형위례，대매체와사삼류진행료모의，분석료매체공극내적속도급압력분포규률，병계산료연 X、Y、Z 방향적삼투계수。계산결과표명：재미관척도하（<100μm）매체삼투계수정현각향이성，기수매체결구적영향교명현。제출적기우CT삼유중건결합역향공정기술구건적매체CAD수자모형불부가진행유한원분석，동시야가이피EDEM등리산원분석연건소사용，탁관료매체CT삼유수거적응용범위，봉부료매체재미관척도상적연구방법。
The aim of this paper is to establish a digital model for characterizing the actual pore structure of coal and further simulating the gas seepage in coal. The computed tomography (CT) data of long-flame coal samples from Daliuta coalmine is obtained through the μCT225kVFCB high precision CT system. It is found that the minimum pore diameter in coal sample is 1.94 μm. Meanwhile, a new method is developed to convert CT three-dimensional (3D) data into CAD digital model, according to the reverse engineering technology and a Matlab language based 3D reconstruction program. As an example, a finite element model is established by Ansys software to simulate the gas seepage. Then the distributions of gas velocity and pressure in the coal pores are analyzed and hydraulic conductivities along X, Y and Z directions are also calculated. The results indicate that the permeability of coal exhibits anisotropy at microscale (<100 μm) and is greatly affected by coal structure. The newly developed CAD digital coal model can be used not only for finite element analysis, but also for discrete element analysis such as EDEM software. Therefore, this study broadens the application of 3D CT data and extends research areas of coal at microscale.