Experimental Investigation on the Applicability of Four Identification Methods for Stress Thresholds of Four Types of Hard Rock Under Uniaxial Compression Test
Source abstract
Abstract
Accurately estimating the stress thresholds (crack closure stress σcc, crack initiation stress σci and crack damage stress σcd) is of great significance to the study of failure mechanisms for hard rock. Uniaxial compression tests were conducted on four types of hard rock to investigate the rationality and applicability of four different identification methods. The stress thresholds obtained by different methods were compared and analyzed. The main research results are as follows. Both the two distinct energy dissipation rate (EDR) methods underestimate the value of σcc, and it is not applicable for hard rock with few primary fractures. Since the method of lateral strain response (LSR) method does not consider the closure process of primary fractures, it underestimates the value of σci. The method of crack volume strain (CVS) or moving point regression (MPR) is recommended to calculate the σci of hard rock. The EDR method overestimates the value of σcd. The method of CVS or MPR is recommended to identify the σcd of hard rock.
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Research context
OpenAlex topics: Rock Mechanics and Modeling · Fatigue and fracture mechanics · Numerical methods in engineering
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Water Resources and Transportation, Zhengzhou University, Zhengzhou 450001, China
Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450003, China
Anhui Survey and Design Institute of Water Resources and Hydropower Co., Ltd., Hefei 230088, China
College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China
Funding
Key Research and Development Project of Henan Province · Funding Project for the Training Program of Young Outstanding Teachers in Higher Education Institutions in Henan Province
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