矿业安全与环保
礦業安全與環保
광업안전여배보
MINING SAFETY & ENVIRONMENTAL PROTECTION
2015年
2期
20-23
,共4页
孤岛工作面%围岩运移%冲击地压%矿震%屈服破坏
孤島工作麵%圍巖運移%遲擊地壓%礦震%屈服破壞
고도공작면%위암운이%충격지압%광진%굴복파배
isolated working face%surrounding rock movement%rock burst%mine earthquake%yield failure
针对孤岛工作面“T”型覆岩结构特征，采用数值模拟方法分析孤岛工作面回采过程中覆岩屈服破坏特征、应力分布规律，研究了孤岛工作面覆岩破断产生强冲击动载荷条件下巷道应力、加速度、位移以及变形速度的变化规律。结果表明：回采初期围岩塑性破坏主要集中在工作面顶板，回采后期覆岩的塑性区逐渐向上覆岩层发展，呈“弧形”对称分布形态；在矿震动载作用下，孤岛工作面巷道左、右帮变形量小于顶、底板变形量，巷道右帮和顶板的变形速度变化较大，且顶板的下沉量最大，左右两帮的垂直应力比顶底板的垂直应力大。研究得出的孤岛工作面覆岩运移、冲击破坏规律，可为工作面防冲工作提供理论指导，以制订针对性的防冲措施，确保工作面安全回采。
針對孤島工作麵“T”型覆巖結構特徵，採用數值模擬方法分析孤島工作麵迴採過程中覆巖屈服破壞特徵、應力分佈規律，研究瞭孤島工作麵覆巖破斷產生彊遲擊動載荷條件下巷道應力、加速度、位移以及變形速度的變化規律。結果錶明：迴採初期圍巖塑性破壞主要集中在工作麵頂闆，迴採後期覆巖的塑性區逐漸嚮上覆巖層髮展，呈“弧形”對稱分佈形態；在礦震動載作用下，孤島工作麵巷道左、右幫變形量小于頂、底闆變形量，巷道右幫和頂闆的變形速度變化較大，且頂闆的下沉量最大，左右兩幫的垂直應力比頂底闆的垂直應力大。研究得齣的孤島工作麵覆巖運移、遲擊破壞規律，可為工作麵防遲工作提供理論指導，以製訂針對性的防遲措施，確保工作麵安全迴採。
침대고도공작면“T”형복암결구특정，채용수치모의방법분석고도공작면회채과정중복암굴복파배특정、응력분포규률，연구료고도공작면복암파단산생강충격동재하조건하항도응력、가속도、위이이급변형속도적변화규률。결과표명：회채초기위암소성파배주요집중재공작면정판，회채후기복암적소성구축점향상복암층발전，정“호형”대칭분포형태；재광진동재작용하，고도공작면항도좌、우방변형량소우정、저판변형량，항도우방화정판적변형속도변화교대，차정판적하침량최대，좌우량방적수직응력비정저판적수직응력대。연구득출적고도공작면복암운이、충격파배규률，가위공작면방충공작제공이론지도，이제정침대성적방충조시，학보공작면안전회채。
To counter to the characteristics of T-shaped overlaying strata in the isolated working face, analysis was made on the yield failure characteristics and the stress distribution law of the overlying strata in the mining process of the isolated working face with numerical simulation method. Research was carried out on the change law of the stress, acceleration, displacement and deformation velocity of the roadway under the strong impact load produced by the overlying strata failure in the isolated working face. The results showed that the plastic failure of the surrounding rock in the initial stage of mining mainly concentrated in the roof of the working face, and in the late stage of mining, the plastic zone of the rock gradually developed to the overlying strata, presented an“arc-shaped” symmetric distribution;the deformation of roadway’ s two sides was smaller than that of roof and floor under the seismic disturbance, the velocity variation of the right side and roof of the roadway was larger and the roof convergence was big, the vertical stress in two sides of the roadway was larger than that in the roof and floor. Through research, the movement and impact failure law of the overlying strata in the isolated working face was obtained, which can provide theoretical guidance for rock burst prevention in the working face, the formulation of preventive measures and the safe mining of the working face.
