爆破动载下水平产状砂质板岩洞室稳定性研究

依托同马山隧道工程，建立了离散元数值模型，着重分析了水平产状砂质板岩层厚、层间结合程度及岩石坚硬程度对钻爆法施工中层状围岩稳定性的影响。研究表明:随着岩层厚度减小，拱顶塌落范围增大，边墙、拱顶等位置破碎程度增加；层间结合程度越差、岩石坚硬程度越低，洞室成形愈加困难；洞室失稳破坏是围岩压力与爆破动载共同作用结果，拱顶与边墙处最易发生破坏。

Study on Stability of Flat-lying Sandy Slate Cavern under Blasting Load

In relation to Tongmashan Tunnel Project, discrete element numerical model was established to analyze the effect of layer thickness of horizontal sandy slate, inter-layer bonding extent and rock hardness on the stability of layered rock in drilling and blasting. Researches show that, as the thickness of rock stratum decreases, both the range of crown collapse and the degree of sidewall and crown crush increases; when the inter-layer bonding extent is worse and the rock hardness is lower, the formation of cavern is more difficult; cavern stability failure is the result of both rock pressure and blasting load, and fracture most likely occurs at the crown and sidewall thereof.