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Dynamic responses and failure modes of stratified sedimentary rocks

机译:分层沉积岩的动态响应与故障模式

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Understanding the dynamic responses and failure modes of stratified sedimentary rocks is critical to predict ground motion in sedimentary rock formations during underground excavation. We experimentally investigated the dynamic properties of sandstone specimens, siltstone specimens, and composite specimens with sealed sandstone-siltstone interfaces using a split Hopkinson pressure bar system. We also numerically examined the effects of rock type, strain rate, particle size, and interface cementation degree on the dynamic properties of sedimentary rock specimens using the discrete element method. Our results show that the dynamic strengths of sandstone and siltstone increase with higher strain rate in a similar manner, but the dynamic strength of sandstone is larger than that of siltstone at the same strain rate. Although the size of deposited particles may not affect the dynamic strength of lithified rocks, the fracture surface of sandstone with large particle size is relatively rough. The degree of cementation at the interface between siltstone and sandstone has a negligible effect on the dynamic strength of sedimentary rocks, but remarkably affects the failure modes. Micro-cracks first initiate in the low-strength siltstone, and coalesce with those subsequently developed in the sandstone and at the sealed interface to form meso-fractures.
机译:了解分层沉积岩的动态响应和失效模式对于预测地下挖掘期间预测沉积岩层的地面运动至关重要。我们通过分裂霍普金森压力棒系统研究了使用拆开砂岩 - 硅铁晶界面的砂岩试样,硅铁石试样和复合标本的动态性质。我们还使用离散元件方法在数值上检查了岩型,应变速率,粒度,粒度和界面粘合程度对沉积岩石标本动态性质的影响。我们的研究结果表明,砂岩和硅铁石的动态优势以相似的方式,砂岩的动态强度大于相同应变率的砂岩。虽然沉积颗粒的尺寸可能不会影响石油化岩石的动态强度,但颗粒尺寸大的砂岩的断裂表面相对粗糙。硅铁晶和砂岩之间的界面处的胶泥程度对沉积岩的动态强度具有可忽略不计的影响,但显着影响失效模式。微裂纹首先在低强度硅铁晶中发起,并将其与砂岩中的那些合并,并在密封界面处形成中间裂缝。

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