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Anisotropic Characteristic of Irregular Columnar-jointed Rock Mass Based on Physical Model Test
Zhinan Lin,Weiya Xu,Huanling Wang,Jiuchang Zhang,Wang Wei,Rubin Wang,Hua Ji 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.5
Columnar joint is a special geological structure with self-organized joint network which separates the rock into an assemblage of blocks. The mechanic characteristics of irregular columnar-jointed rock mass (ICJRM) are dependent not only on the intact rock material but also on unique types of columnar joints. In effort to understand the anisotropic mechanic characteristics of ICJRM by the inherent anisotropic nature of the jointed structure, we conducted a series of uniaxial compression tests. Experiments were performed on an artificial ICJRM of 50 mm in diameter and 100 mm high. The “intact material” consisted of cement mortar and the columnar joints of photosensitive resins. The columnar joint in the specimen was made into six different orientations: 0°, 30°, 45°, 60°, 75°, and 90°, respectively, so observe the deformation behavior and failure modes of ICJRM with different various angles between the loading orientation and columnar joint were observed. Based on the analysis of the test results, the uniaxial compression strength and elastic modulus of ICJRM showed strong anisotropic behavior along with a special “U” shape in response to the angle between the loading orientation and columnar joint. Furthermore, the failure modes of ICJRM was observed.
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Zhinan Lin,Weiya Xu,Wei Wang,Huanling Wang,Rubin Wang,Hua Ji,Jiuchang Zhang 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.9
The strength behavior and deformation modulus of columnar jointed rock mass have been investigated by conducting a series of uniaxial compressive tests, along with consideration of columnar joint effect. The tests have been performed on the artificial physical model samples, incorporating different angles β (which was the between the loading direction and axial direction of the columns) and heights of specimen. Columnar joint is a special geological structure with self-organized joint network which separates the rock into an assemblage of blocks. Due to the special joint network, the anisotropic characteristics of columnar joint rock mass is very remarkable. The physical model consisted of “intact rock” and “jointed filler”, replaced by cement mortar and white cement, respectively. The angle β were set to 0°, 15°, 30°, 45°, 60°, 75° and 90°, respectively, and the heights of specimen were set to five different values. Through the test, failure strength and failure modes of columnar joint rock mass with different angles β were observed. Based on the analysis of the test results, the uniaxial compression strength and average modulus of columnar joint rock mass showed strong anisotropy, showing a special “U” shape in terms of loading orientation. The size effect of columnar jointed rock mass was very typical, and the failure mode of columnar joint rock mass were analyzed. Furthermore, the relationship between failure strength and joint factor was studied.
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