煤层底板承压水导升带影响因素正交模拟试验  

Orthogonal test of the influential factors of confined water-conducting zone in coal floor

作　　者：边凯[1] 杨志斌 

机构地区：[1]河北工程大学资源学院,河北邯郸056038 [2]中煤科工集团西安研究院有限公司,陕西西安710077

出　　处：《煤田地质与勘探》2016年第1期74-78,84,共6页Coal Geology & Exploration

基　　金：国家自然科学基金重点项目(51034003);国家自然科学基金青年项目(41302214;41402220)~~

摘　　要：承压水导升带是煤层带压开采安全评价的重要因素。为了综合研究其影响因素的作用,基于流–固耦合理论,建立了煤层底板突水的水文地质物理概念模型和数值模型,采用FLAC3D数值模拟软件开展了工作面宽度(A)、隔水层厚度(B)、承压水压力(C)、煤层埋深(D)、隔水层渗透系数(E)5个因素5水平的有空列正交模拟试验。结果表明:煤层底板承压水导升高度与底板含水层水压和隔水层渗透性关系密切;各因素对试验结果的影响程度强弱顺序是E>C>D>B>A,其中因素E和C对实验结果影响显著;初始水头压力越大,水头衰减速率就越大,并随着导升高度的增加而加快。改变影响因素而导致承压水压力的变化揭示了煤层开采过程中承压水导升带高度的变化规律,为带压煤层的安全开采提供理论依据。Confined water-conducting zone is an important factor for mining safety assessment in mining under water pressure, in order to study the role of the influential factors, based on the fluid-solid coupling theory, the hydrogeological conceptual model and numerical model of coal floor water inrush was established, then orthogonal simulation test of five factors and five levels was carried out by using numerical simulation software FLAC3D. The results show that confined water-conducting height is closely related to water pressure of aquifer and permeability coefficient of aquiclude, the greater the confined water pressure and permeability coefficient, the higher the initial water-conducting height. The influential order of the factors for the experimental results isE>C>D>B>A,E (permeability coefficient of aquiclude) andC (confined water pressure) significantly affect the result of the experiment. Different initial head pressure cause different head pressure attenuation rate during the process of confined water conduction. The greater the initial head pressure, the greater the head decay rate, this will increase with the conducting height. The fact that the change of the influencial factors leads to the changes of confined water pressure reveals the law of coal floor confined water conductivity in coal mining process, provides the theoretical basis for the safe mining of coal under pressure.

关 键 词：煤层底板突水 正交试验 承压水导升带 数值模拟 

分 类 号：P641.4[天文地球—地质矿产勘探] TD741[天文地球—地质学]