王文学, 苏凌煜, 薛景元, 等. 2021. 基于PIV技术的贯通单裂隙岩体压-剪破坏特征试验[J]. 工程地质学报, 29(4): 1121-1130. doi: 10.13544/j.cnki.jeg.2021-0334.
    引用本文: 王文学, 苏凌煜, 薛景元, 等. 2021. 基于PIV技术的贯通单裂隙岩体压-剪破坏特征试验[J]. 工程地质学报, 29(4): 1121-1130. doi: 10.13544/j.cnki.jeg.2021-0334.
    Wang Wenxue, Su Lingyu, Xue Jingyuan, et al. 2021. PIV technology based experiment for compression-shear failure characteristics of connected fissure rock mass[J]. Journal of Engineering Geology, 29(4): 1121-1130. doi: 10.13544/j.cnki.jeg.2021-0334.
    Citation: Wang Wenxue, Su Lingyu, Xue Jingyuan, et al. 2021. PIV technology based experiment for compression-shear failure characteristics of connected fissure rock mass[J]. Journal of Engineering Geology, 29(4): 1121-1130. doi: 10.13544/j.cnki.jeg.2021-0334.

    基于PIV技术的贯通单裂隙岩体压-剪破坏特征试验

    PIV TECHNOLOGY BASED EXPERIMENT FOR COMPRESSION-SHEAR FAILURE CHARACTERISTICS OF CONNECTED FISSURE ROCK MASS

    • 摘要: 基于PIV技术,采用相似材料预制贯通单裂隙岩体试件并开展压-剪试验,探究了裂隙开度对贯通单裂隙试件的强度、变形及破坏过程的影响。结果表明:(1)试件发生初始断裂时不同裂隙开度试验组应力均明显下降,且随着开度的增大裂隙岩体胶结部位塑性变形增强,岩体试件的特征应力值减小;(2)裂隙开度影响到裂隙和胶结部位变形在试件总变形中所占比例,进而影响裂隙试件的轴向峰值应变和横向峰值应变,开度越大裂隙试件的轴向峰值应变与横向峰值应变越小;(3)随着开度增大试件初始断裂部位由中下部向中上部转移,同时试件逐渐由拉伸剪切复合破坏转变为单一的剪切破坏;(4)需达到位移阈值k试件表面才能产生裂隙,而预制裂隙开度增大会降低试件的位移阈值k。其结果为研究深部矿井裂隙沟通造成的突水溃砂机理奠定了一定的基础。

       

      Abstract: Based on PIV technology,the single-through fractured rock mass specimens were prefabricated by similar materials and compression-shear failure tests were carried out to explore the influence of fracture aperture on the strength,deformation and failure process. The results show that: (1)When the initial fracture occurs,the stress of the test group with different fracture apertures decreases obviously. The plastic deformation of the hinged part of the fractured rock mass increases with the increase of the aperture. The characteristic stress value of the rock mass specimen decreases; (2)The fracture aperture affects the proportion of the deformation of the fracture and the hinge part in the total deformation of the specimen,thereby affecting the axial peak strain and the lateral peak strain of the fractured specimen. The larger the fracture aperture is,the smaller the axial peak strain and the lateral peak strain of the fractured specimen are; (3)By PIV monitoring,it is found that the initial fracture position of the specimen transfers from the middle and lower parts to the middle and upper parts with the increase of aperture degree. The specimen gradually changes from tensile shear composite failure to single shear failure; (4)Through the analysis of displacement contour pictures,it is found that the surface of the specimen needs to reach the displacement threshold k to produce cracks,and the increase of the prefabricated crack aperture will reduce the displacement threshold k of the specimen. The results provide basis for the investigation of the mechanism of water and sand mixture inrush in deep mines.

       

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