本文選題：千枚巖　切入點(diǎn)：強(qiáng)度　出處：《巖土工程學(xué)報(bào)》2017年06期 　論文類(lèi)型：期刊論文

【摘要】：對(duì)成蘭鐵路龍門(mén)山北段隧道群4種典型千枚巖進(jìn)行不同加載方位角的強(qiáng)度和變形特性對(duì)比試驗(yàn)研究,研究結(jié)果表明:加載方位角和巖石礦物成分嚴(yán)重影響千枚巖變形特性,并與圍壓水平有關(guān)。千枚巖單軸抗壓強(qiáng)度隨方位角變化呈"U"型的各向異性特征,所試驗(yàn)的4種千枚巖各向異性率由大至小對(duì)比關(guān)系為:HPMPQPCP。試樣一般在峰值應(yīng)力前產(chǎn)生擴(kuò)容現(xiàn)象,擴(kuò)容起始應(yīng)力和形式與加載方位角或?qū)永戆l(fā)育程度相關(guān)。三軸壓縮試驗(yàn)中,千枚巖垂直層理加載時(shí)的峰值強(qiáng)度、長(zhǎng)期強(qiáng)度和殘余強(qiáng)度比平行層理加載明顯偏高,并隨圍壓水平增加而增大。千枚巖不同加載方位角下單軸壓縮試驗(yàn)破壞模式歸納為4種:層理面滑移剪切破壞、壓拉剪切破壞、張拉破壞、復(fù)合破壞。
[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.
【作者單位】： 北京交通大學(xué)土木建筑工程學(xué)院;昆明理工大學(xué)國(guó)土資源工程學(xué)院;中鐵二院工程集團(tuán)有限公司;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51678034)
【分類(lèi)號(hào)】：U451.5
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本文編號(hào)：1561284