岩石双面剪切细观试验装置的研制及应用

来源期刊:中南大学学报(自然科学版)2015年第9期

论文作者:许江 程立朝 尹光志 刘婧 冯丹

文章页码:3396 - 3405

关键词:岩石力学;砂岩;双面剪切;细观观测;裂纹演化

Key words:rock mechanics; sandstone; double-sided shear; mesoscopic observation; crack evolution

摘    要:为研究岩石的双面剪切细观损伤力学特性,自主研制岩石双面剪切细观试验装置。研究岩石材料的双面剪切强度和变形特性;利用细观观测系统和声发射系统,研究岩石双面剪切破坏过程的细观损伤力学特性;进行烘干砂岩非限制性双面剪切细观力学特性试验,获得双面剪切应力应变曲线、左右预定剪切面附近裂纹演化过程和细观裂纹分布特征。研究结果表明:岩石的双面剪切细观演化过程和裂纹形态分布与相同条件下单剪试验结果相比存在明显差异,利用该装置进行不同条件下的岩石双面剪切细观试验,可以从基于细观的损伤力学角度研究岩石双面剪切破坏机理。

Abstract: The double-sided shear meso test equipment for rock, was developed independently for the study on the mesoscopic damage mechanical properties of rock under double-sided shearing. Using the equipment, the mechanical properties of rock under double-sided shearing could be identified, and the shear strength and deformation characteristics of rock could be studied. Mesoscopic observation system and acoustic emission system could be used to study the mesoscopic damage mechanical properties of rock under double-sided shearing. Further, non-restrictively double-sided shear mesoscopic mechanical properties tests of drying sandstone were carried out. Double-sided shear stress-strain curves, crack evolution near left and right predetermined shear plane, and mesoscopic crack distribution were obtained. The results show that crack evolution and meso-crack distribution characteristics are significantly different compared with single shear. Using this equipment to carry out the rock double-sided shear mesoscopic tests under different conditions can study the rock double-sided shear failure mechanism based on mesoscopic damage mechanics.

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