Experimental Study on Creep of Highly-Weathered Breccia

Abstract:

Mechanical property of rock is the main research object of rock mechanics. In order to further learn the rheological characteristics of soft fractured rock mass, the creep test of highly-weathered breccia with different water content of 0.65%, 1.88%, 4.03% using low-intensity uniaxial creepmeter developed by Shandong University is processed, and the strain-time curves under different water conditions and the corresponding variation of creep curves with different stress levels and moisture states are obtained. The experimental results show that the higher water content is, the larger creep deformation is and the longer time of creep deformation reaching stable is, in other words, the influence of water content on the rheological characteristics of rock mass is also significant. Finally, the conclusion that softening critical load (long-term strength) and softening critical depth of soft rock are greatly reduced due to the effect of water on rock structure and mechanical parameters is obtained to provide the fundamental reference for the follow-up tests and similar engineering.

• Periodical: Applied Mechanics and Materials (Volumes 477-478)
• Pages: 588-591
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.477-478.588
• Online since: December 2013
• Authors: Qian Zhang, Shu Cai Li, Li Ping Li*, Qian Qing Zhang
• Keywords: Creep Deformation, Highly-Weathered Breccia, Rheological Characteristics, Water Content

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