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Micro-textural controlled variations of the geomechanical properties of andesites

机译：微结构控制的安山岩的地质力学特性变化

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摘要

Micro-textural variations are essential for understanding variation in strength and failure behaviorrnof rock material. Therefore the effects of petrography and mineralogy on geomechanical properties have beenrnwidely investigated. In this study andesitic rock samples with different micro-textural characteristics from threerndifferent locations inTurkeywere selected. Unconfined compressive strength tests revealed substantial variationsrnin Unconfined Compressive Strength (UCS) and the micro-crack initiation (σCI ) threshold. Detailed petrophysical,rnpetrographic and mineralogical analysis (XRD) were used to understand these strength variations. Thernsynthesis of strength, petrographic, micro-structural and mineralogical data suggest, that both, the peak strengthrnand crack initiation threshold are strongly influenced by the distribution of plagioclase, amphibole and biotiternphenocrystals, and the mineral composition of the fine-grained matrix.
机译：微观结构的变化对于理解岩石材料的强度和破坏行为的变化至关重要。因此，岩石学和矿物学对地质力学性质的影响已得到广泛研究。在这项研究中，选择了来自土耳其三个不同地点的具有不同微观结构特征的安山岩样品。无侧限抗压强度测试显示无侧限抗压强度（UCS）和微裂纹起始（σCI）阈值存在较大差异。详细的岩石物理，金相和矿物学分析（XRD）用于了解这些强度变化。强度，岩石学，微观结构和矿物学数据的合成表明，斜长石，角闪石和生物钛晶体的分布以及细粒基质的矿物组成都强烈影响峰值强度和裂纹萌生阈值。

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  • 会议地点 Wroclaw(PL)
  • 作者

    ?. ündül; F. Amann; N. Aysal; M. Pl?tze;

  • 作者单位

    Geological Engineering Department, Istanbul University, Istanbul, Turkey,Engineering Geology, Swiss Federal Institute of Technology, Zurich, Switzerland;

    Engineering Geology, Swiss Federal Institute of Technology, Zurich, Switzerland;

    Geological Engineering Department, Istanbul University, Istanbul, Turkey;

    Institute for Geotechnical Engineering, Swiss Federal Institute of Technology, Zurich, Switzerland;

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