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通过五年来三个矿井五条软岩巷道使用条带(石旋)的工程试验,取得了明显的支护效果和经济效益。为探求其支护作用原理、(石旋)体受力状况和破坏过程等,又进行了条带(石旋)和整体连续(石旋)的相似材料模型对比试验。试验结果表明,在相同的围岩、相同的断面和(石旋)体材料,以及在相同的荷载条件下,整体连续(石旋)的变形较大,底鼓明显,(石旋)体较先地出现开裂,且以发生纵向的断裂形式为主,其承载能力较低,较易失稳破坏;而条带(石旋)则由于有卸压通道,允许围岩在卸压通道内产生变形蠕动和片帮剥落等卸压现象,调正、改变了(石旋)体上的受力状况,故(石旋)体的变形较小,出现开裂较迟,且以环向断裂为主,稳定性较好,承载能力较大。在一般的情况下条带(石旋)的承载能力都高于连续(石旋),而在动载的情况下条带(石旋)的承载能力更有明显的提高。根据目前试验的情况看,条带(石旋)适用于塑性流变大、有膨胀性粘土矿物成分的松软岩层平巷或坡度较小的斜巷。
Through five years of three mines five soft rock tunnel strip (stone spin) engineering test, and achieved significant support effect and economic benefits. In order to explore the supporting principle, the bearing capacity and failure process of (stone spin) body, comparative experiments were carried out on similar material models of strip (stone spin) and continuous (stone spin). The experimental results show that in the same surrounding rock, the same section and (lithosphere) material, and under the same load conditions, the overall continuous (stone rotation) deformation larger, the bottom drum obvious, Cracking occurs first and takes the form of longitudinal fracture mainly, which has lower bearing capacity and is more prone to destabilization failure; while the strip (stone rotation) is due to the relief channel, allowing the surrounding rock to be generated in the relief channel Deformation creep and flake peeling and other pressure relief phenomenon, correct, change the (stone rotation) body stress conditions, so (stone rotation) body deformation is smaller, there is a later cracking, and mainly to the ring fracture , Good stability, carrying capacity larger. Under normal circumstances, the belt (stone spin) carrying capacity is higher than continuous (stone spin), and in the case of dynamic load strip (stone spin) carrying capacity has been significantly improved. According to the current test situation, the band (stone spin) is suitable for plastic flow rheology, clay minerals with expansive rock drift or inclined slope with smaller inclines.