Experimental Investigation on Mechanical Properties of Soft Rock under Instantaneous Triaxial Compression

Abstract:

Using the RMT-150C rock mechanics test system, the instantaneous triaxial compression tests for muddy siltstone were carried out under different confining pressures, and the instantaneous mechanical properties of soft rock were obtained. The results show that the strength parameters of sample have a positive linear relation with the confining pressure, and the sensitivity of peak strength on the confining pressure is higher than that of residual strength. The elastic and deformation modulus of sample linearly increase with the confining pressure going up, and the elastic modulus is more sensitive to the confining pressure. The soft rock sample shows typical ductility failure characteristic, while the damage characteristic is mainly shear failure and the shear failure angle linearly decreases with the confining pressure going up.

• Periodical: Advanced Materials Research (Volumes 594-597)
• Pages: 218-221
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.594-597.218
• Online since: November 2012
• Authors: Yu Wang, Feng Liu
• Keywords: Deformation, Instantaneous Triaxial Compression, Rock Mechanics, Soft Rock, Strength

References

[1] MENG Zhaoping, PENG Su ping, LING Biao can. Characters of the deformation and strength under different confining pressures on sedimentary rock[J]. Journal of China Coal Society, 2000,2 5(1):15-18.

[2] WANG Guomin. Experimental study on deformability and strength of soft siltstone[J]. Rock and Soil Mechanics,2000,21(4):340-342.

[3] ZHAO Fasuo, ZHANG Boyou, LOU Quan zhong. Triaxial testing study on soft rocks of a certain engineering slope[J].Journal of Liaoning Technical University(Natural Science Edition),2001,20(4):478-480.

[4] YANG Yongjie, SONG Yang, CHEN Shaojie. Test study of coals strength and deformation characteristics under triaxial compression[J]. Journal of China Coal Society, 2006, 31(2):150-153.

[5] YU Dehai, PENG Jianbing. Experimental study of mechanical properties of chloriter schist with water under triaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(1):205-211.

[6] YANG Shengqi, XU Weiya, SU Chengdong. Study on the deformation failure and energy properties of marble specimen under triaxial compression[J].Engineering Mechanics,2007,24(1):136-142.

[7] LU Yunde, GE Xiurun, JIANG Yu, REN Jianxi.Study on conventional triaxial compression test of complete process for marble and its constitutive equation[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(15):2489-2493.

[8] YOU Ming qing. Effect of confining pressure on the young's modulus of rock specimen and the friction in fissures[J].Rock and Soil Mechanics,2003,24(Supp.):167-170.

[9] WANG Ruihong.Study on the mechanical property of sandstone at unloading situation[Ph.D.Thesis][D]. Wuhan：Wuhan University,2009.

[10] ZHU Jiebin. Study on unloading mechanics and its rheological properties of rock under high stress[Ph.D.Thesis][D]. Wuhan：Chinese Academy of Sciences,2009.

[11] DENG Huafeng. Study on the mechanism and effects of water-rock interaction under water level change region[Ph.D.Thesis][D].Wuhan:Wuhan University,2010.