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Effect of the Rock Stress on the Water Jet Cutting Performance
Rock Mechanics and Rock Engineering ( IF 6.2 ) Pub Date : 2021-06-06 , DOI: 10.1007/s00603-021-02508-w
Battista Grosso , Valentina Dentoni , Augusto Bortolussi

Underground quarrying is rarely adopted for granite extraction due to the difficulties in the implementation of traditional technologies (drilling and explosive). As alternative to drilling and explosive, the combination of diamond wire and water jet seems to be the most promising available technology. The cutting performance achievable with the water jet technology depends on the operative parameters, the material characteristics and the state of stress within the rock massif. To assess the effect of the state of stress on the cutting rate, laboratory tests have been performed with an oscillating water jet machine on granite samples subjected to a static load. The stress distribution in the layer of rock to be removed has been evaluated by numerical simulation with the FLAC code (Fast Lagrangian Analysis of Continua). The correlation between the results of the cutting tests and the numerical models of the rock samples has been inferred. Starting from a conceptual model, which theoretically describes the relationship between the cutting rate and the stress, a step function was defined that indicates the ranges of stress where predefined values of the cutting rate are workable.



中文翻译:

岩石应力对水射流切割性能的影响

由于传统技术(钻孔和炸药)难以实施,地下采石很少用于花岗岩开采。作为钻孔和炸药的替代金刚石线和水射流的结合。似乎是最有前途的可用技术。水射流技术可实现的切割性能取决于操作参数、材料特性和岩体内的应力状态。为了评估应力状态对切削速度的影响,我们使用振动水射流机对承受静载荷的花岗岩样品进行了实验室测试。待拆除岩石层的应力分布已通过 FLAC 代码(Continua 的快速拉格朗日分析)的数值模拟进行评估。已经推断出切削试验的结果与岩石样品的数值模型之间的相关性。从一个概念模型出发,理论上描述了切削速率之间关系 和应力,定义了一个阶跃函数,该函数指示切削速率的预定义值是可行的应力范围。

更新日期:2021-06-07
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