倾斜煤层长壁开采承压底板力学结构及渗流稳定性分析  

Mechanical structure and seepage stability of confined floor response to longwall mining of inclined coal seam

作　　者：梁帅帅 张东升 范钢伟 KOVALSKY Evgeny 范张磊 张磊 韩学森 LIANG Shuai-shuai;ZHANG Dong-sheng;FAN Gang-wei;KOVALSKY Evgeny;FAN Zhang-lei;ZHANG Lei;HAN Xue-sen(School of Mines,China University of Mining and Technology,Xuzhou 221116,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China;Department of Mining Engineering,Saint Petersburg Mining University,Saint Petersburg 199106,Russia)

机构地区：[1]School of Mines,China University of Mining and Technology,Xuzhou 221116,China [2]State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China [3]Department of Mining Engineering,Saint Petersburg Mining University,Saint Petersburg 199106,Russia

出　　处：《Journal of Central South University》2023年第9期2948-2965,共18页中南大学学报（英文版）

基　　金：Project(2021ZDPY0226) supported by the Fundamental Research Funds for the Central Universities,China;Project(20201101009) supported by the Unveiling Bidding Project of Shanxi Province of China;Project(202206420003) supported by the China Scholarship Council。

摘　　要：倾斜煤层开采底板破坏易造成水资源流失甚至突水灾害问题,倾斜煤层产量在中国总产量中占有一定比例,因此,开展关于地面结构对地下开采响应稳定性的研究有重要意义。首先,通过分析底板应力状态与变形破坏规律,建立了双向线性载荷作用下四边固支倾斜层合板模型;然后,通过研究渗透系数与变形之间的关系得到渗流稳定性判别方法及条件,并通过工程案例确定了倾斜煤层保水开采的影响因素及其敏感性。倾斜煤层底板最大挠度工作面方向位于工作面中下部0.5864倍的工作面长度处,推进方向上位于0.5864倍的工作面推进距离处。通过正交试验分析得出底板挠度影响因素的显著性大小排序为:工作面长度>水压>推进度>地层倾角。层合板中上层层位边界为压应力区域,中部为拉应力区域,中下层层位则相反,剪应力分区域集中分布。工作面下侧区域各应力最大值均大于上侧区域的,表现出明显的非对称性。最后,确定了渗流稳定性评价指标及稳定条件:极限渗透系数(K_(li))与等效渗透系数(K_(eq))之比不小于1,即K_(li)/K_(eq)≥1。渗流稳定性影响因素的显著性大小为:水压>工作面长度>地层倾角,可为类似矿井的保水开采提供建议。The floor of inclined coal seams during mining is prone to seepage instability,resulting in water loss and even water inrush.The production of inclined coal seams occupies a certain proportion in China.Therefore,it is necessary to carry out the research on the floor structure stability in response to underground mining.Firstly,a four-side solid support inclined laminate model was established by analyzing the stress state and deformation failure law of inclined floor under the action of bidirectional linear load.Then,by studying the relationship between permeability coefficient and deformation,the method and conditions for determining seepage stability are obtained,and the influencing factors and sensitivity of water protection mining in inclined coal seams are determined through engineering cases.The inclined floor deflection curve is not symmetrical;the maximum deflection of the inclined coal seam floor is located at a distance of 0.5864 times the length of the working face in the middle and lower part of the working face,and at a distance of 0.5864 times the advance distance of the working face in the advancing direction.Through an orthogonal experimental analysis,the significance order of the factors affecting the deflection of the bottom plate is as follows:working face length>water pressure>advance distance>dip angle.The boundary of the upper layer in the laminated plate is a compressive stress area,while the middle layer is a tensile stress area.The opposite is true for the middle and lower layers,where shear stress is concentrated in different regions.The maximum stress values in the lower area of the working face are greater than those in the upper area,showing an obvious asymmetry.Finally,the evaluation indicators and stability conditions for seepage stability were determined:the ratio of the ultimate permeability coefficient(K_(li))to the equivalent permeability coefficient(K_(eq))should not be less than 1,that is,K_(li)/K_(eq)³1.The significance of the factors affecting seepage stability is as follows

关 键 词：层合板模型 倾斜煤层 结构稳定性 渗流稳定性 等效渗透系数 正交分析 显著性分析 

分 类 号：TD745[矿业工程—矿井通风与安全]