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李玉成,孙浩程,房 媛,杨定韬,孟祥瑞.含平行裂隙节理岩体的破坏规律研究水资源与水工程学报[J].,2019,30(5):215-220
含平行裂隙节理岩体的破坏规律研究
Study on failure law of jointed rock with parallel-cracks
  
DOI:10.11705/j.issn.1672-643X.2019.05.33
中文关键词:  节理岩体  平行裂隙  模拟材料  裂隙倾角  平行粘结  破坏规律  DEM分析
英文关键词:joint rock  parallel crack  simulating material  crack angle  parallel bonding  failure law  DEM analysis
基金项目:国家自然科学基金项目(10872133); 上海市软科学研究领域重点项目(18692106100)
作者单位
李玉成,孙浩程,房 媛,杨定韬,孟祥瑞 (上海理工大学 上海 200093) 
摘要点击次数: 28
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中文摘要:
      对含平行裂隙相似材料试件进行单轴压缩试验,并用PFC3D模型进行了模拟。通过试验和DEM结果对比分析,探讨了含平行双裂隙岩体在单轴压缩下的破坏规律。研究结果表明:在变形破坏阶段,当轴向应变达到0.02后,应力-应变曲线出现“双峰”现象;抗压强度随预制裂隙倾角的增大呈非线性变化。预制裂隙倾角较小时(≤ 45°),抗压强度随裂隙倾角变化规律不明显。预制裂隙倾角在45°时,试块抗压强度最低。预制裂隙倾角较大时(≥ 45°),抗压强度随裂隙倾角的增大而增大;裂纹起裂区域均位于两预制裂隙中间区域。随着预制裂隙倾角的增大,萌生裂纹的端点位置从两端点均在预制裂隙中间,向一端点位于裂隙中间另一端点位于预制裂隙顶端,到两端点均位于预制裂隙顶端转变;试件不同预制裂隙倾角对应不同的岩桥倾角,岩桥倾角较大时(≥ 60°),岩桥倾角与抗压强度呈正相关关系。
英文摘要:
      The uniaxial compression test was carried out on the materials specimens with similar parallel-cracks and it was simulated using the PFC3D model. A failure mechanism study of jointed rock with parallel-cracks was discussed by comparison of uniaxial compression test and DEM. The results showed that: at the deformation and failure stage, the“double peak” phenomenon appears in the stress-strain curve when the axial strain reaches 0.02. The uniaxial compressive stress varies nonlinearly with the increase of the pre-existing cracks dip angle. When the pre-existing cracks dip angle is no more than 45°,the uniaxial compressive stress does not change significantly with the pre-existing cracks dip angle. The uniaxial compressive stress of specimen with 45° pre-existing cracks dip angle is lowest. The uniaxial compressive of specimen increases with an increasing pre-existing cracks dip angle when the pre-existing cracks dip angle is larger than 45°. The range of crack initiation is located in the middle of the two pre-existing cracks. With the pre-existing cracks dip angle increase, the crack initiation position extends from the end of the crack at the middle of the pre-existing cracks to the end point is located at the other end of the crack at the tip of the pre-existing cracks,and finally transform to both ends are the crack tip. Different pre-existing cracks dip angle of the specimens corresponds to different ligament angles. When the ligament angle is large than 60°, it is positively correlated to the uniaxial compressive stress.
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