CAJ | 학술논문

基于神东矿区1-2#煤层的赋存条件和开采技术条件，采用FLAC3D 数值模拟方法，研究浅埋薄基岩回采工作面快速推进过程中的矿压显现规律，为工作面支架阻力确定和岩层控制提供依据。结果表明，随着推进速度的增加，顶板压力呈现减小趋势；推进速度越快，工作面前方应力集中程度越高，峰值应力距工作面距离越小，应力集中影响范围呈减小趋势；推进速度不同时煤层上部的薄基岩和厚松散层破断都直接波及地表，地表下沉量明显高于相同条件下的正常采深煤层工作面；浅埋采场上覆松散层变形移动过程中难以形成承载结构，荷载估算时不能采用传统的普氏压力拱理论。
기우신동광구1-2#매층적부존조건화개채기술조건，채용FLAC3D 수치모의방법，연구천매박기암회채공작면쾌속추진과정중적광압현현규률，위공작면지가조력학정화암층공제제공의거。결과표명，수착추진속도적증가，정판압력정현감소추세；추진속도월쾌，공작면전방응력집중정도월고，봉치응력거공작면거리월소，응력집중영향범위정감소추세；추진속도불동시매층상부적박기암화후송산층파단도직접파급지표，지표하침량명현고우상동조건하적정상채심매층공작면；천매채장상복송산층변형이동과정중난이형성승재결구，하재고산시불능채용전통적보씨압력공이론。
In order to provide the basis for the support resistance calculation and strata control of mining face with the shallow mining depth and thin bedrock,based on the engineering geological conditions and mining conditions of the 1-2# coal seam in Shendong Mining Area,the FLAC3D numerical simulations was applied to study the mine strata pressure behavior laws in the process of rapid mining velocity. Results show that the roof pressure trends to decrease as the mining velocity increases. The faster the mining velocity,the higher concentration degree at the front working face is,and the shorter the distance from the peak stress is. The distance between the face and the location of the peak abutment pressure also decreases. The zone of stress concentration tends to decrease. The roof breaking of coal seam with shallow mining depth and thin bedrock and thick unconsol-idated layers directly affects the surface at the different mining velocity. The surface subsidence is obviously higher than the normal mining deep coal seam face at the same conditions;It is difficult to form bearing structure in the process of the overlying thick unconsolidated layers movement of shallow coal stope. Therefore,the load estimation of thick unconsolidated layers can′t be made by the traditional Pu′s compressive arch theory.