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首页> 外文期刊>International journal of geomechanics >Unified Size-Effect Law for Intact Rock
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Unified Size-Effect Law for Intact Rock

机译：完整岩石的统一尺寸效应定律

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摘要

A suite of laboratory testing was performed on Gosford sandstone samples having a range of sizes, including point-load and uniaxial compressive tests. A unified size-effect law (USEL), based on the work by Zdenek Bazant, involving fracture energy as well as fractal theories, was introduced. It was shown that USEL correlates well with the ascending and descending uniaxial compressive strength trends obtained from Gosford sandstone as well as five other rock types reported by Brian Hawkins. Fractal characteristics found to be the primary mechanism for ascending strength trends and surface flaws could be considered as a secondary mechanism. The influence of the contact area on the size-effect behavior of point-load results was investigated using a new approach. This approach was novel in the way it incorporated the load contact area. Determination of the point-load strength index using this new approach led to opposite size-effect trends compared with those observed using a conventional point-load strength index. Hence, the utilization of USEL leads to better simulation of the new point-load strength index data.
机译：对具有各种尺寸的Gosford砂岩样品进行了一套实验室测试，包括点载荷试验和单轴压缩试验。在Zdenek Bazant的工作的基础上，引入了统一的尺寸效应定律（USEL），其中涉及断裂能以及分形理论。结果表明，USEL与从Gosford砂岩以及Brian Hawkins报告的其他五种岩石类型获得的单轴抗压强度的上升和下降趋势密切相关。分形特征被认为是增加强度趋势的主要机制，而表面缺陷可以被认为是次要机制。使用一种新方法研究了接触面积对点荷载结果尺寸效应行为的影响。这种方法在合并负载接触区域方面是新颖的。与使用常规点载荷强度指数观察到的结果相比，使用这种新方法确定点载荷强度指数导致了相反的尺寸效应趋势。因此，使用USEL可以更好地模拟新的点荷载强度指标数据。

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