【摘要】：隨著開采深度增加,巖體動(dòng)力學(xué)行為表現(xiàn)出新特征和新現(xiàn)象,深部巖體超低摩擦效應(yīng)產(chǎn)生機(jī)理是其中關(guān)鍵科學(xué)問題之一。由于超低摩擦效應(yīng),巖體平衡關(guān)系和約束條件被破壞,極易發(fā)生平動(dòng)和轉(zhuǎn)動(dòng),從而誘發(fā)巖爆、沖擊地壓等動(dòng)力災(zāi)害,對(duì)礦山安全開采構(gòu)成巨大威脅。因此,研究深部巖體超低摩擦效應(yīng)對(duì)礦山安全開采及煤巖動(dòng)力災(zāi)害預(yù)測(cè)與防治具有重要價(jià)值和實(shí)際應(yīng)用意義。本文以花崗巖塊體模型為研究對(duì)象,采用FLAC-3D數(shù)值軟件對(duì)兩種加載條件,即垂直沖擊和水平靜力共同作用、垂直沖擊和水平?jīng)_擊共同作用下,深部巖體超低摩擦效應(yīng)進(jìn)行了數(shù)值模擬,得到了模型中工作塊體水平位移、法向力演變規(guī)律及塊體模型垂直方向及水平方向應(yīng)力的分布特征。研究表明：花崗巖塊體模型在兩種加載條件下,隨著沖擊載荷幅值增大,工作塊體法向力幅值變化范圍和水平殘余位移均逐漸增大,從而導(dǎo)致了超低摩擦效應(yīng)發(fā)生,并且越來越明顯；隨著沖擊載荷頻率增大,工作塊體接觸面法向力衰減速度增加,水平殘余位移減小,超低摩擦效應(yīng)不斷減弱；隨著開采深度增加,工作塊體水平殘余位移及法向力均逐漸增加,超低摩擦效應(yīng)愈加明顯。垂直沖擊和水平?jīng)_擊共同作用于花崗巖塊體模型時(shí),水平?jīng)_擊載荷先于或后于垂直沖擊載荷施加,法向力幅值的變化范圍均增大,超低摩擦效應(yīng)更趨顯著。水平?jīng)_擊載荷引起的水平殘余位移遠(yuǎn)大于垂直沖擊載荷引起的水平殘余位移,因此,在接觸面平行方向上的水平?jīng)_擊是深部巖體超低摩擦效應(yīng)主要影響因素。
[Abstract]:With the increase of mining depth, the dynamic behavior of rock mass shows new characteristics and new phenomena. The mechanism of ultra-low friction effect in deep rock mass is one of the key scientific problems. Because of the ultra-low friction effect, the equilibrium relationship and constraint conditions of rock mass are destroyed, and it is easy to occur translation and rotation, thus inducing dynamic disasters such as rockburst and ground pressure, which pose a great threat to the safe mining of mines. Therefore, it is of great value and practical significance to study the ultra-low friction effect of deep rock mass for safe mining, prediction and prevention of coal-rock dynamic disasters. In this paper, the granite block model is studied, and two loading conditions, vertical impact and horizontal static force, vertical impact and horizontal impact, are analyzed by using FLAC-3D software. The ultra-low friction effect of deep rock mass is numerically simulated, and the horizontal displacement and normal force evolution of the working block in the model and the distribution characteristics of the vertical and horizontal stress in the block model are obtained. The results show that under two loading conditions, the range of normal force amplitude and the horizontal residual displacement of the working block gradually increase with the increase of impact load amplitude, which leads to the occurrence of ultra-low friction effect. And more obvious; With the increase of the impact load frequency, the normal force attenuation velocity of the working block contact surface increases, the horizontal residual displacement decreases, and the ultra-low friction effect weakens. With the increase of mining depth, the horizontal residual displacement and normal force of the working block increase gradually, and the effect of ultra-low friction becomes more obvious. When the vertical impact and horizontal impact act on the granite block model, the amplitude of normal force increases, and the effect of ultra-low friction becomes more obvious when the horizontal impact load is applied before or after the vertical impact load. The horizontal residual displacement caused by the horizontal impact load is much larger than the horizontal residual displacement caused by the vertical impact load. Therefore, the horizontal impact in the parallel direction of the contact plane is the main factor affecting the ultra-low friction effect of the deep rock mass.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD32

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