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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Analysis of the radial and tangential stress distribution between two neighbouring circular holes under internal pressure by numerical modelling
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Analysis of the radial and tangential stress distribution between two neighbouring circular holes under internal pressure by numerical modelling

机译：内压作用下两个相邻圆孔之间径向和切向应力分布的数值模拟

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Stress analysis in a rock medium is essential to determine the stress concentration between two consecutive circular holes and prediction of fracture behaviour. When two consecutive circular holes in a hard rock medium such as granite are loaded internally by the pressure of non-explosive expansion material (NEEM), stress concentration occurs between the holes which then causes the rock to fracture. In this work, finite element (FE) analysis using Phase2 code was employed to study the stress concentration between two consecutive circular holes under internal pressure induced by NEEM. Effects of different hole diameters and spacings, rock properties and NEEM pressures have been analysed. The data gained from the numerical analysis and analytical solutions were then used to develop two models. These models were then modified by using the FE data and polynomial regression analysis. The developed analytical models showed to be in a very good agreement with the FE analysis. Hence, the developed models can be used with confidence to determine stress distribution and concentration factors around two consecutive circular holes in a hard and brittle rock which are loaded internally by the pressure induced from the NEEM.
机译：岩石介质中的应力分析对于确定两个连续的圆形孔之间的应力集中以及预测断裂行为至关重要。当在非岩石膨胀材料（NEEM）的压力作用下在花岗岩等硬岩介质中连续加载两个连续的圆形孔时，孔之间会发生应力集中，从而导致岩石破裂。在这项工作中，采用了使用Phase2代码进行的有限元（FE）分析来研究NEEM引起的内部压力下两个连续圆形孔之间的应力集中。分析了不同孔径和间距，岩石性质和NEEM压力的影响。从数值分析和解析解中获得的数据随后被用于开发两个模型。然后，通过使用有限元数据和多项式回归分析来修改这些模型。所开发的分析模型表明与有限元分析非常吻合。因此，所开发的模型可以放心地用于确定硬脆岩石中两个连续圆孔周围的应力分布和集中系数，这些圆孔是由NEEM产生的压力内部加载的。

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