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首页> 外文会议>Advances in Geotechnical Engineering: The Skempton Conference vol.1 >Shear Resistance Of Biotite-Schist: Peak And Post- Peak Behaviour
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Shear Resistance Of Biotite-Schist: Peak And Post- Peak Behaviour

机译：黑云母片岩的抗剪强度：峰和峰后行为

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摘要

The knowledge of shear behaviour of biotite-schist is of crucial importance for engineering purposes. There is little and sometimes controversial information published about this issue. A special investigative campaign was performed on biotite schist samples. The samples were extracted from quartz-biotite-schist bands, layered in-between fresh granite-gneiss, in Eastern Brazil. Shear resistance of this biotite-schist showed to be surprisingly low. After several special tests and investigations, it was concluded that this low shear resistance was related to the following causes: a) a very strong schistosity or textural anisotropy, due to intense quartz grain flattening around at least X/Y >=2:1 and strong laminar orientation of the micas; b) selective dissolution of interstitial quartz grains from the matrix due to differential weathering. The geomechanical consequence was an extremely low residual friction angle (< 15° ) during solicitation. This may be explained as associated to an immediately previous negative dilation effect by collapse of the porous structure and local absence of ploughing resistance of the zones where quartz has been selectively removed.
机译：黑云母片岩剪切行为的知识对于工程目的至关重要。关于此问题的信息很少，有时甚至有争议。对黑云母片岩样品进行了专门的调查活动。样品是从巴西东部的新鲜花岗岩-片麻岩之间分层的石英黑云母片岩带中提取的。该黑云母片岩的抗剪强度显示出令人惊讶的低。经过数次特殊测试和调查后得出的结论是，这种低抗剪切性与以下原因有关：a）由于强烈的石英晶粒至少在X / Y> = 2：1附近变平，因此具有很强的集散性或结构各向异性。云母的强烈层流方向； b）由于不同的风化作用，从基体中选择性地溶解了间隙石英晶粒。地质力学的结果是在拉拔过程中残余摩擦角极低（<15°）。这可以解释为由于多孔结构的塌陷和石英被选择性除去的区域的抗犁性的缺失而引起的先前的负膨胀效应。

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