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首页> 外文期刊>Engineering Fracture Mechanics >Fracture behaviour of cemented tailing backfill with pre-existing crack and thermal treatment under three-point bending loading: Experimental studies and particle flow code simulation
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Fracture behaviour of cemented tailing backfill with pre-existing crack and thermal treatment under three-point bending loading: Experimental studies and particle flow code simulation

机译：用三点弯曲加载下存在裂纹尾泥浆泥浆尾矿回填的断裂行为：实验研究和粒子流量模拟

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摘要

The three-point bending test was performed on cemented tailing backfill prepared with different offset notches by a loading system with high-speed camera. And the effect of heated temperature on CTB fracture behavior has been investigated. These results indicate that the influence of preexisting notch and temperature on CTB fracture feature is obvious. The peak load increases linearly with the increasing of the offset ratio when the depth-height ratio of notch is fixed at the same value, while the fracture peak loading decreases sharply with the increase of the notch depth when the offset ratios are the same level. The fracture toughness decreases by 63.5% as the heated temperature rises from 20 degrees C to 120 degrees C. The fracture toughness is directly proportional to the porosity of CTB. The increasing of porosity leads to the decrease of the fracture toughness mainly due to the decomposition of hydration products and the coarsening of the pore structure of CTBs. The crack propagates along the interface among tailing particles, resulting in a rough and jagged edge propagation path. The rack propagation pattern of CTB samples contains transgranular fracture and intergranular fracture. The intergranular fracture is clearly predominant during crack propagation. The rack propagation and failure pattern of CTB specimens from numerical modeling are conformed to the failure pattern of samples obtained by experimental testing. PFC is an effective numerical analysis method for exploring the fracture mechanism of micro-cracking in CTB.
机译：通过具有高速摄像头的装载系统使用不同的偏移凹口制备的粘合尾矿回填的三点弯曲试验。加热温度对CTB骨折行为的影响。这些结果表明，预先存在的凹口和温度对CTB裂缝特征的影响是显而易见的。当凹口的深度高比率固定在相同的值时，峰值负荷随着偏移比的增加而增加，而当偏移比率相同的凹槽深度的增加，断裂峰值负载急剧下降。由于加热温度从20℃升高至120℃，断裂韧性降低63.5％。断裂韧性与CTB的孔隙率成比例。孔隙率的增加导致断裂韧性的降低主要是由于水合产物的分解和CTB的孔结构的粗化。裂缝沿着尾部粒子之间的界面传播，导致粗糙和锯齿状的边缘传播路径。 CTB样品的机架繁殖模式含有响囊骨折和晶间骨折。在裂纹繁殖期间，晶间裂缝显然是占主导地位的。来自数值建模的CTB样本的机架传播和故障模式符合通过实验测试获得的样品的故障模式。 PFC是一种有效的数值分析方法，用于探索CTB中微裂纹的断裂机制。

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