(1. 東北大學 資源與土木工程學院，沈陽 110004；
2. 礦冶科技集團有限公司，北京 102628)
摘 要: 采空區(qū)是影響礦山安全的重大危險源之一。針對金廠峪礦露天采場隱伏空區(qū)，首先分析了各空區(qū)工況條件下露天采場邊坡失穩(wěn)破壞特征，其次采用類比法、力學理論計算以及極限平衡法校核等，確定了隱伏空區(qū)預處理頂板安全厚度，形成了一種空區(qū)頂板安全厚度的綜合判別法。結果表明：空區(qū)存在時出現(xiàn)應力集中現(xiàn)象和拉剪破壞，空區(qū)頂板失穩(wěn)造成露天采場邊坡局部滑塌，空區(qū)回填后邊坡穩(wěn)定性明顯改善；當空區(qū)跨度為12 m時，頂板安全厚度取10.5 m合適，滿足類比法及主要工程力學理論的安全要求。
關鍵字: 隱伏空區(qū)；破壞特征；頂板安全厚度；極限平衡法；綜合判別法；空區(qū)治理
（1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110004, China;
2. BGRIMM Technology Group, Beijing 102628, China）
Abstract:Goaf is one of major hazards affecting mine’s safety. In allusion to concealed goaves underneath Jinchangyu gold mine pit, the instability characteristics of pit slope under different working conditions with goaf were analyzed. Secondly, analogy method, mechanical theories and limit equilibrium method were used to determine the crown pillar safety thickness for pre-treatment, and a comprehensive discriminant method was formed. The results show that the stress concentration and tension-shear failure will occur when goaf exists, the roof instability can cause pit slope local collapse, but the slope stability can be obviously improved after backfilling goaves. When the goaf span is 12 m, the crown pillar safety thickness can be 10.5 m, which satisfies the safety requirements of analogy method and main engineering mechanical theories.
Key words: concealed goaf; failure characteristics; crown pillar safety thickness; limit equilibrium method; comprehensive discriminant method; goaf treatment
