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黄冬梅, 卢欢欢, 潘鑫, 乔书昱, 王新照. 单轴压缩条件下含孔洞裂隙红砂岩力学行为及声发射特征分析[J]. 矿业安全与环保.
引用本文: 黄冬梅, 卢欢欢, 潘鑫, 乔书昱, 王新照. 单轴压缩条件下含孔洞裂隙红砂岩力学行为及声发射特征分析[J]. 矿业安全与环保.
HUANG Dongmei, LU Huanhuan, PAN Xin, QIAO Shuyu, WANG Xinzhao. Analysis of mechanical behavior and acoustic emission characteristics of red sandstone with pores and cracks under uniaxial compression[J]. Mining Safety & Environmental Protection.
Citation: HUANG Dongmei, LU Huanhuan, PAN Xin, QIAO Shuyu, WANG Xinzhao. Analysis of mechanical behavior and acoustic emission characteristics of red sandstone with pores and cracks under uniaxial compression[J]. Mining Safety & Environmental Protection.

单轴压缩条件下含孔洞裂隙红砂岩力学行为及声发射特征分析

Analysis of mechanical behavior and acoustic emission characteristics of red sandstone with pores and cracks under uniaxial compression

  • 摘要: 为了研究含孔洞裂隙缺陷岩体的力学行为和声发射特征,利用PFC软件对不同裂隙倾角的红砂岩试件进行了单轴压缩数值试验,分析了其破裂特征、应力应变全过程以及声发射累计振铃计数,初步探讨了岩样的损伤演化特性。研究结果表明,单裂隙岩样的峰值应力和弹性模量均随裂隙倾角的增大而增大;三种缺陷类型岩样的峰值应力和弹性模量均在裂隙倾角为0°时最小,倾角为90°时最大。单裂隙的岩样多为预制裂隙尖端发育的翼裂纹贯通破坏;裂隙未贯穿孔洞的岩样,除裂隙倾角为90°外,其他倾角岩样的失稳破坏模式均沿倾角延展方向贯通。单裂隙岩样的裂隙倾角越大,产生明显发射的应变范围越小;裂隙未贯通孔洞岩样发生声发射信号的时间更早于其他两种类型岩样,三种缺陷类型岩样均在裂隙倾角为90°时声发射累计振铃计数最高。

     

    Abstract: In order to study the mechanical behavior and acoustic emission characteristics of rock mass with holes and cracks, the uniaxial compression numerical test of red sandstone specimens with different crack dip angles was carried out by PFC software. The fracture characteristics, the whole process of stress and strain and the cumulative ringing count of acoustic emission were analyzed, and the damage evolution characteristics of rock samples were preliminarily discussed. The results show that the peak stress and elastic modulus of single fracture rock samples increase with the increase of fracture dip angle. The peak stress and elastic modulus of the three defect types of rock samples are the smallest when the fracture dip angle is 0°, and the largest when the dip angle is 90°. The rock samples with single fracture are mostly wing cracks developed at the tip of prefabricated cracks. For rock samples with cracks not penetrating holes, except that the crack dip angle is 90°, the instability failure modes of rock samples with other dip angles are all connected along the dip angle extension direction. The larger the fracture dip angle of single fracture rock sample is, the smaller the strain range of obvious emission is. The time when the acoustic emission signal occurs in the rock sample with the fracture not penetrating the hole is earlier than that of the other two types of rock samples. The three types of rock samples have the highest cumulative acoustic emission ringing count when the fracture dip angle is 90°.

     

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