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| ANALYSIS OF STRENGTH AND CONVENTIONAL TRIAXIAL COMPRESSION DEFORMATION CHARACTERS OF COARSE SANDSTONE AFTER HIGH TEMPERATURE |
| SU Chengdong，WEI Sijiang，YANG Yushun，QIN Bendong |
| (School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454010，China) |
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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.
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2015, Vol. 34 
