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| STUDY OF EVOLUTION LAW OF MICROFRACTURING PROGRESS OF SANDSTONE UNDER SHEAR LOADING |
| (1. Key Laboratory for the Exploitation of Southwestern Resources and the Environmental Disaster Control Engineering，Ministry of Education，Chongqing University，Chongqing 400044，China；2. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam，Chongqing University，Chongqing 400044，China) |
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Abstract Experimental study is made on microfracturing progress of microcrack of sandstone and its distribution characteristics after failure under shear loading condition by independent developmental coal or rock microscopic shear testing device. Simultaneously，temporal and spatial evolution law of microcrack of sandstone under the shear loading is also researched by image processing technology. The results show that damage of sandstone specimen in external appearance is unconspicuous in most part of the loading process，and microfracturing progress of sandstone is finished in a relatively short time. Deformation of sandstone is also small during the fracturing progress. The conspicuous microfracturing progress is in the damage stage after peak stress and in general the fracture is extended upward from the bottom of the specimen. Furthermore，in the process of rupture failure of sandstone，it is produced both intergranular fracture and transgranular fracture，however，the main microfracturing progress is produced in grain boundary and cement；this is mainly low consume energy in the failure mode. Because the fracturing progress of microcrack is influenced by permutation and combination mode and cementation degree of mineral particles in sandstone surface；the spreading direction of microcrack has irregularity，which has bias in some degree compared with predetermined shear plane.
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Received: 23 December 2010
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2011, Vol. 30 
