Abstract
The Brazilian split test was performed on two groups of limestone samples with loading directions vertical and parallel to the bedding plane, and the response laws of the electrical resistivity and acoustic emission (AE) in the two loading modes were obtained. The test results showed that the Brazilian split test with loading directions vertical and parallel to the bedding showed obviously different results and anisotropic characteristics. On the basis of the response laws of the electrical resistivity and AE, the damage variables based on the electrical resistivity and AE properties were modified, and the evolution laws of the damage variables in the Brazilian split test with different loading directions were obtained. It was found that the damage evolution laws varied with the loading direction. Specifically, in the time-varying curve of the damage variable with the loading direction vertical to the bedding, the damage variable based on electrical resistivity properties showed an obvious damage weakening stage while that based on AE properties showed an abrupt increase under low load.
Highlights
Composed of various minerals, rock is a common engineering material with complex mechanical properties
According to these test results, the response laws of the electrical resistivity and acoustic emission (AE) in the Brazilian split test with the loading direction vertical to the sample bedding were obtained as follows: (1) The entire loading process was divided into three stages: compaction, elastic deformation, and plastic deformation and failure
According to these test results, the response laws of the electrical resistivity and AE in the Brazilian split test with the loading direction parallel to the sample bedding were obtained as follows: (1) Significantly different from the Brazilian split test with the loading direction vertical to the bedding, the entire loading process consisted of the elastic deformation stage as well as plastic deformation and failure stage without an obvious compaction stage
Summary
Rock is a common engineering material with complex mechanical properties. Controlled by tensile and compressive stress, the failure behaviors of rock under stress are highly complex. The tensile strength of rock (especially for coal) is far less than its compressive strength, and a lower tensile stress level can cause brittle fracture, which seriously threatens the safety and stability of the engineering structure. Studies on rock tensile failure are of great significance for underground engineering including tunnel, underground chamber, and coal mining [1]. The electrical resistivity and AE methods are applied to studies on the failure process of rock [2, 3]. Studies on the response laws of the electrical resistivity and AE during the failure process are of great value, which help to understand the rock failure mechanism and to analyze the field real-time monitoring data of electrical resistivity and AE
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