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首页> 外文会议>14th Australasian tunneling conference: Development of underground space >Analytical Approach for Stability Analysis of Rock Wedges with Soil-Infi lled Joints Formed in a Tunnel Roof
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Analytical Approach for Stability Analysis of Rock Wedges with Soil-Infi lled Joints Formed in a Tunnel Roof

机译：隧道顶板中具有土体变形缝的岩楔稳定性分析方法

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The use of an equivalent continuum for a rock mass is not always suitable for situations where thernfailure is structurally controlled by discontinuities as in the case of wedges in the tunnel roof. In theserninstances, discontinuum approaches are usually preferred. Rock joints that are fi lled with soft infi llrnare likely to be the weakest planes in a rock mass, having a dominant infl uence on its overall shearrnbehaviour. In this case, the joint material model adopted for the discontinuities should be able torndescribe important mechanisms, such as asperity sliding and shearing, post-peak behaviour, asperityrndeformation, and the effect of the soft infi lling. The latest version of a soil-infi lled joint model isrndiscussed here. It describes more comprehensively than previous models the occurrence of dilationrnand compression with lateral displacements, and also represents the hardening mechanism relatedrnto asperity interference as observed in the laboratory that cannot be readily captured by the existingrnjoint models. An analytical approach for the analysis of rock wedges structurally controlled by soilinfirnlled joints is presented.rnThe analytical approach presented in this paper for assessment of symmetric rock wedges in thernroof of a tunnel demonstrates, that the peak shear strength of the joint may not be fully mobilisedrnbefore detachment of the wedge. The analysis verifi ed that an overestimation of the factor of safetyrnmay be observed when an elastic-perfectly-plastic joint model was assumed, whereas the computedrnmaximum factor of safety was considerably less when adopting an appropriate soil-infi lled jointrnmodel.
机译：对于岩体，使用等效的连续体并不总是适合于通过断层在结构上控制失稳的情况，例如在隧道顶板中的楔形情况下。在这种情况下，通常首选不连续方法。充满软弱变形的节理可能是岩体中最薄弱的平面，其整体抗剪特性具有主要影响。在这种情况下，用于不连续点的接头材料模型应该能够描述重要的机制，例如粗糙面滑动和剪切，峰后行为，粗糙面变形以及软填充的影响。这里讨论的是土壤灌装联合模型的最新版本。它比以前的模型更全面地描述了带有横向位移的膨胀和压缩的发生，并且还代表了在实验室中观察到的与粗糙干扰有关的硬化机制，现有的联合模型无法轻易捕获。本文提出了一种分析方法，用于分析由土质节理节理控制的岩楔。本文提出的用于评估隧道顶板中对称岩楔的分析方法表明，节理的峰值抗剪强度可能尚未完全动员。楔块的分离。分析证明，当采用弹性-完全塑性接头模型时，可能会高估安全系数，而当采用适当的土壤有限接头模型时，计算出的最大安全系数要小得多。

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