单轴压缩下含孔洞裂隙砂岩力学特性试验分析

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Abstract By using rock mechanics testing system and acoustic emission(AE) equipment，the mechanical behavior of sandstone(the size is 60 mm×120 mm×30 mm) containing a single hole and fissure are tested by uniaxial compression test. Based on the experimental results，the strength and deformation behavior of fractured sandstone are first analyzed. The results show that the mechanical parameters of fractured sandstone are significantly lower than that of intact sample，and the reducing extent depends on hole diameter and symmetrical distribution of flaws. With the increase of hole diameter，the peak strength and peak strain of sandstone containing a single hole decreases gradually. The mechanical parameters of samples with asymmetrical flaw geometry are lower than that of samples with symmetrical flaw geometry. And then，on the basis of AE behavior of sandstone samples containing a single hole and fissure during loading，the AE distribution is significantly affected by flaw geometry，which is mainly due to significant differences of crack coalescence modes of sample containing different holes and fissures. Finally，by photographic measurement techniques，the failure modes of sandstone containing different holes and fissures are analyzed，and the crack coalescence process of sample containing a single hole and fissure and its effect on microscopic stress-strain curve are also investigated.

Key words： rock mechanics sandstone hole fissure peak strength acoustic emission(AE) crack coalescence

Received: 11 April 2012

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/Is2/3539

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