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首页> 外文期刊>Canadian Geotechnical Journal >Prediction of end-bearing capacity of rocksocketed shafts considering rock quality designation (RQD)
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Prediction of end-bearing capacity of rocksocketed shafts considering rock quality designation (RQD)

机译：考虑岩石质量指示（RQD）的嵌齿井筒的承载能力预测

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摘要

Existing empirical methods for determining the end-bearing capacity, qmax, use empirical relations between qmax and the unconfined compressive strength of intact rock, sc. As rock-socketed shafts are supported by the rock mass, not just the intact rock, one should consider not only the intact rock properties, but also the influence of discontinuities on rock mass properties when determining q_(max). Although semi-empirical and analytical methods have been developed that can consider the effect of discontinuities, they are more complicated than the empirical relations and require information about discontinuities that is often not available or difficult to obtain in engineering practice. In this paper, an empirical relation between q_(max) and the unconfined compressive strength of rock mass, σ_(cm), is developed. The new empirical relation explicitly considers the effect of discontinuities represented by rock quality designation (RQD), which is the parameter normally obtained in engineering practice. The accuracy of the expression for estimating scm based on RQD is verified by comparing its estimation values with those from the existing empirical expressions based on rock mass classification. Two examples are presented to show the application of the newly developed empirical relation between q_(max) and σ_(cm).
机译：用于确定端部承载力qmax的现有经验方法使用qmax与完整岩石sc的无侧限抗压强度之间的经验关系。由于嵌岩井不仅是完整的岩石，而且是由岩石支撑的，因此在确定q_（max）时，不仅应考虑完整的岩石特性，而且还应考虑不连续性对岩体特性的影响。尽管已经开发出可以考虑不连续性影响的半经验和分析方法，但是它们比经验关系更为复杂，并且需要有关不连续性的信息，而这些信息在工程实践中通常是不可用或难以获得的。本文建立了q_（max）与岩体无侧限抗压强度σ_（cm）之间的经验关系。新的经验关系明确考虑了以岩石质量标记（RQD）表示的不连续性的影响，岩石质量标记是工程实践中通常获得的参数。通过将RQD的估算值与基于岩体分类的现有经验表达式的估算值进行比较，可以验证基于RQD的scm估算表达式的准确性。给出两个例子来说明新开发的经验关系在q_（max）和σ_（cm）之间的应用。

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