煤体的三维微观重构及其与瓦斯耦合的动力学基础研究

项目名称： 煤体的三维微观重构及其与瓦斯耦合的动力学基础研究

项目编号： No.51304128

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 王刚

作者单位： 山东科技大学

项目金额： 25万元

中文摘要： 为了从微观上揭示采动条件下煤体内瓦斯的运移规律，以煤体微观结构特性和瓦斯为研究对象，首先使用微焦点CT系统，采用细化算法和定义局部圆柱形搜索区域的方法对煤体的断层图像三维建模处理技术进行开发，实现对煤孔隙特征的三维可视化；然后进行煤体中瓦斯的剪切渗流实验研究，分析在剪切作用下煤中瓦斯的渗流特性；采用气体渗透稳态法，在恒温、恒湿和径向应变受到严格约束的情况下，测定不同孔隙压力和不同压差条件下的渗透率，得出煤体在应力变化状态下瓦斯的解吸/吸附和运移模型；并将其与煤体三维重构网络模型进行耦合。项目预期将揭示微观状态下瓦斯在煤体中的运移特性，实现煤体三维孔隙结构的微观重构，建立基于三维微观结构的煤与瓦斯动力学模型。项目的研究成果对于煤与瓦斯突出机理的深入研究具有重要意义，可以为煤与瓦斯突出的防治提供科学依据。

中文关键词： 瓦斯渗流；三维重建；真三轴；颗粒流模拟；预测模型

英文摘要： With industrial Micro-focus CT scanning system, this study will develop the three-dimensional modeling treatment technology of the sectional image of coal to realize the three-dimensional characterization of the pore structure. All this can offer basic data for the study of gas adsorption / desorption process in microcosmic size. This usage also reveals the coupling process of coal and gas as well as their stress / strain, gas adsorption / desorption, shearing and seepage of gas from the microscopic scales. In order to study on the seepage characteristics of gas, the new NC coal joint test-bed of shearing seepage and coupling will been used when it is sheared in the coal. In the case that the temperature and the humidity is constant and the radial strain gets strict constraints, the project intends to measure the permeability under different pore pressure and different pressure difference, meanwhile, we will create the mathematical model of permeability and gas pressure. Through verifying the reliability of the mathematical model based on the experimental data, we can obtain the evolution process of the coal permeability under the conditions of the fact that gas pressure changes, and create a coupling dynamics model of gas migration and coal deformation and then we couple it with three-dimensional reconstructio

英文关键词： gas flow；three-dimensional reconstruction；true triaxial；particle flow simulation；prediction model