高温后粗砂岩常规三轴压缩变形与强度特征分析

doi:10.13722/j.cnki.jrme.2014.0272

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摘要通过对经历400 ℃～1 000 ℃高温后的粗砂岩进行常规三轴压缩试验，分析试样变形、强度和破坏特征与温度、围压的关系。结果表明：经历400 ℃高温后的试样围压高于20 MPa时，试样峰值强度附近出现明显屈服平台，经历超过600 ℃以上高温的试样均具有明显峰值点，随温度升高试样的塑性减弱脆性增强；400 ℃以内高温对试样的变形参数影响不大，经历超过400 ℃以上高温的试样的弹性模量、变形模量和极限应变随围压增加单调增加呈正相关性；试样的弹性模量和变形模量随温度升高单调降低，而峰值应变随温度升高单调增加。高温后试样峰值强度随围压增大而单调增加，符合Coulomb强度准则，综合围压影响系数为6.541；800 ℃以内高温对试样黏聚力、内摩擦角影响不明显，经历1 000 ℃高温后的试样黏聚力急剧降低，内摩擦角稍有增加；800 ℃以内高温对粗砂岩具有强化作用，扣除围压影响后试样材料强度与温度呈正相关，超过800 ℃以上高温使试样强度有所弱化，试样材料强度与温度呈负相关性；高温后试样的试验破坏角和理论破坏角基本一致，高温对试样破坏角影响较小，试验破坏角随围压增加而单调减小，围压对试样破坏角的影响大于温度的影响。

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关键词 ：岩石力学, 高温, 粗砂岩, 变形特征, 强度特征, 破坏特征

Abstract：The relationship between rock samples? deformation，strength and failure characters and temperature，confining pressure was analysed by common conventional triaxial tests of coarse sandstone after high temperature rangeing from 400 ℃～1 000 ℃. Obvious yielding plateau nearby peak strength appears when confining pressure was higher than 20 MPa after 400 ℃，but all samples have obvious peak strength points after 600 ℃. With the increase of temperature，samples have much weaker plastic characteristic and stronger brittleness. Temperature within 400 ℃ has little influence on deformation characters of samples. But with the increase of confining pressure，positive correlations with elasticity modulus，deformation modulus and ultimate strain exist when temperature exceeds 400 ℃. However，elasticity modulus，deformation modulus have negative correlations and positive relation of peak strength strain with increase of temperature. Peak strength of samples after high temperature monotonically increase with confining pressure increasing，conformed to Coulomb Rule. Comprehensive coefficient of confining pressure is 6.541. High temperature within 800 ℃ has little influence on cohesion，angle of internal friction. The cohesion decreases sharply and angle of internal friction increases slightly when temperature exceeds 1 000 ℃. High temperature within 800 ℃ has a reinforcing effect on strength of coarse sandstone and there is a positive correlation between strength and temperature when confining pressure was deducted. But when the high temperature exceeds 800 ℃，temperature has weaker influence on strength of samples，which is negative. Rupture angles in tests and theory are consistent basically，High temperature has little influence on rupture angle. Negative relation exists between confining pressure and rupture angle，which is much more remarkable than temperature.

Key words： rock mechanics high temperature coarse sandstone deformation characteristics strength characteristics failure characteristics

引用本文:

苏承东，韦四江，杨玉顺，秦本东. 高温后粗砂岩常规三轴压缩变形与强度特征分析[J]. 岩石力学与工程学报, 2015, 34(s1): 2792-2800.
SU Chengdong，WEI Sijiang，YANG Yushun，QIN Bendong. ANALYSIS OF STRENGTH AND CONVENTIONAL TRIAXIAL COMPRESSION DEFORMATION CHARACTERS OF COARSE SANDSTONE AFTER HIGH TEMPERATURE. , 2015, 34(s1): 2792-2800.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0272 或 http://www.rockmech.org/CN/Y2015/V34/Is1/2792

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