(中南大學(xué) 資源與安全工程學(xué)院，長沙 410083)
摘 要: 傾斜礦體采場在開采后會暴露出較大的頂板及上盤，穩(wěn)定性狀況非常復(fù)雜，為了研究其穩(wěn)定性及穩(wěn)定的概率，本文通過Mathews合成圖、考慮靜荷載和爆破動荷載的FLAC3D數(shù)值模擬兩種方式展開了研究。以某鉛鋅礦四個傾斜礦體采場為研究對象，采用RMR及Q′值法進(jìn)行了巖體分級，使用重新繪制的考慮穩(wěn)定等概率線的Mathews合成圖和擬合的穩(wěn)定等概率線公式，得到了四個采場頂板及上盤的穩(wěn)定性狀況和穩(wěn)定概率；采用FLAC3D中加入爆破荷載的方式研究了采場在靜力和動力下的穩(wěn)定性。結(jié)果表明：由于考慮了暴露時間對采場穩(wěn)定性的影響，發(fā)現(xiàn)暴露時間對巖性較差的采場影響尤其顯著；Mathews穩(wěn)定圖法與數(shù)值模擬法相互驗(yàn)證，可較全面地分析傾斜礦體采場的穩(wěn)定性。
關(guān)鍵字: 巖體分級；Mathews穩(wěn)定圖；數(shù)值模擬；動態(tài)擾動；穩(wěn)定概率
（School of Resources and Safety Engineering, Central South University, Changsha 410083, China）
Abstract:The stopes of the inclined orebody expose two surfaces of the crown and the hanging wall after mining, so the stability analysis of the inclined orebody stopes is one of the most complicated issues of mining. To study the stability and the stable probability of the inclined orebody stopes, this paper carried out the research through two methods of Mathews synthetic graph and FLAC3D numerical modeling of static and dynamic loads. First, four stopes of the inclined orebody in a Lead-Zinc mine were selected, and the rock mass of them was classified using the RMR and Q′ value method. Later, the stable probabilities of the crown and the hanging wall of the four stopes were obtained by the fitted stable isoprobability line equations and the redrawn Mathews stability synthetic graph considering the stable isoprobability lines. Finally, the stabilities of the inclined orebody stopes under static and dynamic loads were studied by adding blasting load to numerical modeling. The results show that exposure time has a significant impact on the stopes with poor rock mass when considering the influence of exposure time on stopes stability. The stope stability of the inclined ore body can be analyzed comprehensively through mutual verification of Mathews stability diagram and FLAC3D numerical simulation.
Key words: rock mass classification; Mathews stability graph; numerical modeling; dynamic disturbance; the stable probability
