热-力耦合作用下煤体渗流规律演化研究

Study on evolution of seepage law of coal body under the action of thermal-force coupling

能源是社会发展的内在基础,然而,随着煤炭资源进入深部开采之后,矿山安全开采面临严峻的挑战。深部开采时,煤体处于“高地应力”“高渗透压”“高温”的复杂地质条件,这一地质条件下煤体渗透演化规律是由多相共存和多场耦合共同影响所决定的,而煤体的渗透率直接影响着煤矿开采的安全性。为探究这一问题,分析了温度、变形以及基质—裂隙之间的相互作用,进而构建了热—力耦合作用下的煤体渗透率表征模型,并验证了该模型的准确性。这一模型不仅是研究多相多场煤层瓦斯运移规律的重要理论基础,也是煤层瓦斯治理的重要理论依据,可为研究多场耦合瓦斯运移及煤层瓦斯治理提供理论依据和技术指导。

Energy is the intrinsic foundation of social development.However,as coal resources enter deep mining,mine safety is facing serious challenges.When deep mining,the coal body is in the complex geological conditions of"high geostress""high osmotic pressure"and"high temperature",and the evolution law of coal body permeability under this geological conditions is determined by the joint influence of multi-phase coexistence and multi-field coupling.The permeability of the coal body directly affects the safety of coal mining.In order to investigate this problem,this paper analyzed the interactions between temperature,deformation and matrix-fracture,and then constructed a model to characterize the permeability of the coal body under the thermal-force coupling,and finally verified the accuracy of the model.This model is not only an important theoretical basis for studying the gas transport law of multi-phase multi-field coal seams,but also an important theoretical basis for coal seam gas management.In order to provide theoretical basis and technical guidance for the study of multi-field coupling gas transport and coal seam gas management.