龙门山北段千枚岩强度及变形特性对比试验研究

发布时间：2018-03-03 13:46

  本文选题：千枚岩　切入点：强度　出处：《岩土工程学报》2017年06期 　论文类型：期刊论文

【摘要】：对成兰铁路龙门山北段隧道群4种典型千枚岩进行不同加载方位角的强度和变形特性对比试验研究,研究结果表明:加载方位角和岩石矿物成分严重影响千枚岩变形特性,并与围压水平有关。千枚岩单轴抗压强度随方位角变化呈"U"型的各向异性特征,所试验的4种千枚岩各向异性率由大至小对比关系为:HPMPQPCP。试样一般在峰值应力前产生扩容现象,扩容起始应力和形式与加载方位角或层理发育程度相关。三轴压缩试验中,千枚岩垂直层理加载时的峰值强度、长期强度和残余强度比平行层理加载明显偏高,并随围压水平增加而增大。千枚岩不同加载方位角下单轴压缩试验破坏模式归纳为4种:层理面滑移剪切破坏、压拉剪切破坏、张拉破坏、复合破坏。
[Abstract]:The strength and deformation characteristics of four typical phyllite in the north section of Longmen Mountain Tunnel Group of Cheng-Lan Railway are studied. The results show that the loading azimuth angle and the mineral composition of rock seriously affect the deformation characteristics of phyllite, and the results show that the loading azimuth angle and the mineral composition of rock seriously affect the deformation characteristics of phyllite. The uniaxial compressive strength of phyllite varies with azimuth angle with "U" anisotropy, and the anisotropy ratio of the four phyllite tested varies from big to little to small. The specimen generally produces dilatancy before the peak stress. In triaxial compression tests, the peak strength, long-term strength and residual strength of phyllite under vertical bedding loading are obviously higher than those under parallel bedding loading. The failure modes of axial compression test of phyllite under different loading azimuths are summarized into four types: slip shear failure, compression shear failure, tensioning failure and composite failure.
【作者单位】： 北京交通大学土木建筑工程学院;昆明理工大学国土资源工程学院;中铁二院工程集团有限公司;
【基金】：国家自然科学基金项目(51678034)
【分类号】：U451.5
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本文编号：1561284