Effect of water absorption ratio on tensile strength of red sandstone and morphological analysis of fracture surfaces  

作　　者：WANG Min CAO Ping LI Rui-chao FAN Xiang 王敏;曹平;李瑞超;范祥

机构地区：[1]School of Resources and Safety Engineering,Central South University,Changsha 410083,China [2]Hunan Provincial Key Laboratory of Shale Gas Resource Utilization,Hunan University of Science and Technology,Xiangtan 411201,China [3]School of Highway,Chang’an University,Xi’an 710064,China

出　　处：《Journal of Central South University》2017年第7期1647-1653,共7页中南大学学报（英文版）

基　　金：Project(E21527)supported by Open Research Fund Program of Hunan Provincial Key Laboratory of Shale Gas Resource Utilization,Hunan University of Science and Technology,China;Projects(51174088,51174228)supported by the National Natural Science Foundation of China;Project(2013CB035401)supported by the National Basic Research Program of China;Project(2015zzts077)supported by the Fundamental Research Funds for the Central Universities,China

摘　　要：Brazilian disc tests were undertaken on a number of red sandstone samples with different water absorption ratios.The tensile strength of the red sandstone decreases as the water absorption ratio increases.The fracture surfaces of failed red sandstone discs were scanned by Talysurf CLI 2000.With the aid of Talymap Gold software,based on ISO25178,a set of statistical parameters was obtained for the fracture surfaces.The maximum peak height(S_p),maximum pit height(S_v) and maximum height(S_z) of the fracture surfaces exhibited the same decreasing trend with increasing water absorption.Sa and Sku values for the fracture surfaces showed a downward trend as the water absorption ratio increased.The fractal dimensions of fracture surfaces were calculated and found to decrease as the water absorption ratio increased.Through analysis of PSD curves,the smallest dominant wavelength was observed to reflect the roughness of the fracture surfaces.Additionally,the results suggest that the roughness of fracture surfaces becomes small as the water absorption ratio increases.Brazilian disc tests were undertaken on a number of red sandstone samples with different water absorption ratios. The tensile strength of the red sandstone decreases as the water absorption ratio increases. The fracture surfaces of failed red sandstone discs were scanned by Talysurf CLI 2000. With the aid of Talymap Gold software, based on ISO25178, a set of statistical parameters was obtained for the fracture surfaces. The maximum peak height (S-p), maximum pit height (S-v) and maximum height (S-z) of the fracture surfaces exhibited the same decreasing trend with increasing water absorption. S (a) and S (ku) values for the fracture surfaces showed a downward trend as the water absorption ratio increased. The fractal dimensions of fracture surfaces were calculated and found to decrease as the water absorption ratio increased. Through analysis of PSD curves, the smallest dominant wavelength was observed to reflect the roughness of the fracture surfaces. Additionally, the results suggest that the roughness of fracture surfaces becomes small as the water absorption ratio increases.

关 键 词：WATER absorption ratio BRAZILIAN DISC test FRACTURE surface MORPHOLOGICAL analysis ROUGHNESS 

分 类 号：TU45[建筑科学—岩土工程]