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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Application of modified Hoek-Brown transition relationships for assessing strength and post yield behaviour at both ends of the rock competence scale
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Application of modified Hoek-Brown transition relationships for assessing strength and post yield behaviour at both ends of the rock competence scale

机译：修正的Hoek-Brown转换关系在评估岩石能力标度两端的强度和屈服后行为方面的应用

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摘要

Support system design for tunnels and underground excavations has for many years relied heavily on the use of rock muss classifi cation systems and the Hock- Brown failure criterion as a means lor characterizing rock mass behaviour. Because of their development, both the GSI system and the Hoek-Brown criterion admirably characterize most 'normal' rockmasses from the viewpoint of their behaviour for rock excavations. They, however, run into difficulties when applied at the two ends of the rock competence scale. This is largely because block size and incipient strength are such that rock mass behaviour in these domains tends not to be controlled by interblock shear strength but rather by material strength. At the low-end of the rock competence scale (UCSi 15 MPa and CSI generally <30) discontinuities play less of a role and rock mass strength tends to matrix strength. Similarly, at the high end of the scale (GSI 65, m_i 15). because discontinuities arc now widely spaced, block size becomes so significant that again, intact material behaviour rather than the fracturing becomes the dominant factor controlling rock mass strength. In this paper several case examples are presented to illustrate the application of the high-end (spallingl and low-end (weak ground) transition Hoek-Brown relationships proposed by Carter. Diederichs and Carvalho (2007) as a basis for better defining rock mass behaviour at the extreme ends of the rock competence scale.
机译：多年以来，隧道和地下基坑的支护系统设计在很大程度上依赖于岩石分类系统和霍克-布朗破坏准则作为表征岩体行为的手段。由于它们的发展，无论是GSI系统还是Hoek-Brown准则，从它们在岩石开挖中的行为角度来看，它们都能很好地表征大多数“正常”岩体。但是，将它们应用于岩石能力标度的两端会遇到困难。这主要是因为块体尺寸和初始强度使得这些区域中的岩体行为往往不受块体间剪切强度的控制，而是受材料强度的控制。在岩石能力等级的低端（UCSi 15 MPa，CSI通常<30），不连续性的作用较小，岩石质量强度趋向于基体强度。同样，在规模的高端（GSI 65，m_i 15）。因为现在不连续的弧线分布很宽，所以块体的尺寸变得如此之大，以至于完整的材料性能而不是断裂成为控制岩体强度的主要因素。本文以几个案例为例，说明了由Carter。Diederichs和Carvalho（2007）提出的高端（偏斜和低端（弱地面）过渡Hoek-Brown关系）的应用，作为更好地定义岩体的基础行为在岩石能力量表的最末端。

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