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《Journal of Engineering Geology》 2002-01
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X-RAY CT OBSERVATION ON THREE-DIMENSIONAL FRACTURING PROCESS OF SANDSTONE SPECIMEN UNDER UNIAXIAL CONDITION

WU Yanqing ①② DING Weihua ② (①Coal Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000) (②Xi′an University of Technology, Xi′an 710048)  
Fracturing process of rock caused by loading is an important problem in study of failure mechanism of rock. In order to analyze quantitatively the fracturing process of rock, sandstone specimen was tested under uniaxial and triaxial compressions and observed by X-ray . From the result the formula of rock damage variable and its increment and the calculation of rock initial damage variable are proposed. Analyzed CT images and relational curves between stress and density damage increment of sandstone, we found that the fracturing process of sandstone occurred in five stages,i.e. the compaction by initial damage, crack extension, the crack merging and forking of crack, the continuos forking and extension of crack, and the connection of cracks and failure of rock. In the stage of compaction by initial damage, density damage increment of sandstone is positive and the rate ia positive. In the stage of crack extension, local density damage increment of sandstone decreased and changed from positive to negative, and the rates changed also from positive to negative with increasing stress. In the stage of merging and forking of crack, density damage increment of sandstone is negative and the rate became higher. In the stage of continuous forking and extension of crack, density damage increment of sandstone is continuously negative, but the rate became slower. In the stage of connection of cracks and failure of rock, the density damage increment of sandstone is continuously negative and the rate became higher.
【Fund】: 国家自然科学基金 (批准号 :10 172 0 71)资助项目 ;; 国家冻土工程重点实验室基金项目产 80 3)资助 ;; 陕西省教育厅专 项科研计划项目 ( 0 0JK2 18) .
【CateGory Index】: TU458
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