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Blockiness level of rock mass around underground powerhouse of Three Gorges Project

机译：三峡工程地下厂房周围岩体的阻隔性水平

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A fundamental question in rock mechanics is whether a rock mass is a continuum or an assemblage of isolated blocks. Some models have treated rock masses as continuums and others, as isolated blocks. Most rock masses are neither continuums nor isolated blocks, but something between them. This study presents a new concept of blockiness to measure a rock's level of being an assemblage of isolated blocks. Thirty-five types of theoretical fractured rock mass structural models are established by considering fracture classifications. For each structure, rock blocks are identified using the GeneralBlock program, and the blockiness is investigated. The blockiness of the surrounding rock mass of the underground powerhouse in the Three Gorges Project is systematically investigated. Based on measurements of fractures obtained from a field survey, a discrete fracture network model is established by an inverse method for identifying and analyzing rock blocks. The results show that the blockiness of the surrounding rock mass of the underground powerhouse is only 4 parts per thousand; the total rock mass shows very good quality and stability; the number of blocks in the rock mass is quite small; therefore, the volume of isolated blocks only accounts for a very small proportion of the total rock volume; and the rock mass can be considered a continuum. The excavation process of the underground powerhouse in the Three Gorges Project verified these conclusions; only a few blocks are formed by fractures in the rock mass of the underground powerhouse. The calculation results for the 35 models show that the blockiness of the rock mass having medium persistence and very wide spacing is very low. The structure of the rock mass around the underground powerhouse is of this type. Its blockiness agrees with the model calculation results. Therefore, the calculation results for the 35 models are useful in predicting the stability of rock Masses having different persistence and spacing, and they could serve as a reference for quantifying the quality of rock masses in other projects. And, in this study, the concept of the blockiness level of rock mass was determined by one example only, and more studies would be concluded for other projects to validate this concept in future study. (C) 2015 Elsevier Ltd. All rights reserved.
机译：岩石力学中的一个基本问题是，岩体是连续体还是孤立块的集合。一些模型将岩体视为连续体，而其他模型则将其视为孤立块。大多数岩体既不是连续体也不是孤立的块，而是它们之间的某种东西。这项研究提出了一种块状性的新概念，以衡量岩石作为孤立块的集合的水平。通过考虑裂缝分类，建立了35种理论裂缝岩体结构模型。对于每种结构，使用GeneralBlock程序识别岩石块，并研究其块状性。三峡工程对地下厂房周围岩体的阻隔性进行了系统的研究。基于从现场勘测获得的裂缝测量结果，通过反演方法建立离散裂缝网络模型，以识别和分析岩石块。结果表明，地下厂房围岩的块状度仅为千分之四。总岩体显示出非常好的质量和稳定性；岩体中的块数很小；因此，孤立块的体积仅占岩石总量的很小一部分；岩体可以看作是一个连续体。三峡工程地下厂房的开挖过程证实了这些结论。地下厂房岩体中的裂缝仅形成了几块。 35个模型的计算结果表明，具有中等持久性和非常宽的间距的岩体的块状性非常低。地下厂房周围的岩体结构就是这种类型。其块状性与模型计算结果一致。因此，这35个模型的计算结果可用于预测具有不同持久性和间距的岩体的稳定性，并可以作为量化其他项目中岩体质量的参考。并且，在本研究中，仅通过一个示例来确定岩体阻塞性水平的概念，并且将在其他项目中进行更多的研究，以在以后的研究中验证该概念。 （C）2015 Elsevier Ltd.保留所有权利。

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