Study on Creep Characteristics and Long-Term Strength of Mud-Calcareous Conglomerates in the Three Gorges Reservoir Area

Ruihong Wang, Hao Luo, Chao Yang () and Fang Wang
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Ruihong Wang: Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang 443002, China
Hao Luo: College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China
Chao Yang: College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China
Fang Wang: College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China

Sustainability, 2023, vol. 15, issue 12, 1-18

Abstract: The study of the time-dependent properties of engineering rock masses is a frontier topic in rock mechanics. In this study, creep tests and stress relaxation tests were conducted on mud-calcareous conglomerates from the Three Gorges Reservoir Area, and the long-term strength values of the conglomerate specimens were determined via different methods based on the test curves. By comparing these mainstream long-term strength determination methods, it was found that each of these methods have their own drawbacks. For example, the transition creep method requires a high accuracy of the test curve and only obtains an approximate strength interval rather than an accurate value. The long-term strength values determined by the isochronous stress–strain curve method are strongly influenced by subjective factors, among other things. Therefore, this paper proposes a new method for determining long-term strength, called the steady-state creep rate method, based on stress intervals. By comparison, the long-term strength values determined via this method are in good agreement with the transition creep method, the volume expansion method, and the stress relaxation method.

Keywords: creep mechanical; stress relaxation; long-term strength determination method (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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