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为预测煤层底板突水情况,将采动底板剩余完整岩层带内强度较高的单一薄岩层(或相距较近含软弱夹层的2层薄坚硬岩层构成的复合岩层)简化为四边固支的矩形薄板,建立煤层底板隔水关键层力学模型。分别基于Tresca屈服准则和Mohr-Coulomb屈服准则,推导出2种屈服准则下的底板突水力学判据。依据现场底板突水的预测结果,对突水判据的安全性进行比较分析。结果表明:Mohr-Coulomb屈服准则更趋于实际矿山岩体工程性质,基于Mohr-Coulomb屈服准则推导的底板突水判据预测煤矿底板突水更安全可靠。
In order to predict the water inrush of the coal seam floor, a simple thin rock layer (or composite rock formation composed of two thin hard rock layers with weak intercalation) with higher strength in the remaining intact rock strata of the mining floor is simplified to a rectangle with four sides fixed Sheet, the establishment of the key layer of coal floor waterproofing mechanical model. Based on the Tresca yield criterion and the Mohr-Coulomb yield criterion, two criteria of yielding hydraulic inrush mechanics were deduced. According to the predictions of in-situ floor water inrush, the safety of water inrush criterion is comparatively analyzed. The results show that the Mohr-Coulomb yield criterion tends to be more practical engineering rock masses, and the water inrush criterion of coal floor is more reliable and safe based on Mohr-Coulomb yield criterion.