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| 不同粗糙度花岗岩-混凝土试件剪切声发射特性研究 |
| Study on the shear acoustic emission characteristics of granite-concrete specimens with different roughnesses |
| 投稿时间：2024-06-06 修订日期：2024-11-16 |
| DOI： |
| 中文关键词: 花岗岩-混凝土界面 粗糙度 直剪试验 应力应变曲线 声发射参数 |
| 英文关键词:Granite-concrete interface roughness direct shear test stress-strain curve acoustic emission parameters |
| 基金项目:国家自然科学基金(No.52078093)；辽宁省兴辽英才项目(No.XLYC1905015)资助 |
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| 中文摘要: |
| 为研究粗糙度对花岗岩-混凝土粘结试件的剪切力学性质影响，采用劈裂法制得结构面并使用三维形貌仪扫描获得其粗糙度系数JRC后，在结构面上浇筑混凝土制成粘结试件后进行剪切试验并同步记录声发射参数。试验结果表明，不同粗糙度的花岗岩-混凝土粘结试件剪切应力应变曲线大致趋势差别不大，但随着粗糙度的增大，试件的剪切软化特征越来越明显且峰值剪切强度随着粗糙度的增大而增大。此外，由于不同粗糙度试件结构面起伏形态不同，会使试件的剪切破坏模式发生变化。声发射能量及振铃计数都随着粗糙度的增大呈增大趋势，不同粗糙度试件的累积声发射振铃计数及能量的数值可以反映出试件的剪切破坏相对强度。对声发射b值的分析可以发现，粘结面的破坏伴随着内部裂纹的发育贯通，且粗糙度越大，其声发射b值越小。研究结果可为工程中花岗岩-混凝土界面剪切破坏行为分析提供参考。 |
| 英文摘要: |
| In order to study the influence of roughness on the shear mechanical properties of granite-concrete bonded specimens, the structural plane was obtained by splitting method, and the roughness coefficient JRC was obtained by scanning with a three-dimensional morphographer. The test results show that the general trend of the shear stress-strain curves of granite-concrete bonded specimens with different roughness is not much different, but with the increase of roughness, the shear softening characteristics of the specimens become more and more obvious, and the peak shear strength increases with the increase of roughness. In addition, due to the different undulation patterns of the structural planes of the specimens with different roughnesses, the shear failure modes of the specimens will change. The AE energy and ringing count both increase with the increase of roughness, and the cumulative AE ringing count and energy values of the specimens with different roughness can reflect the relative strength of the shear failure of the specimens. The analysis of the AE b value shows that the failure of the bond surface is accompanied by the development of internal cracks, and the larger the roughness, the smaller the AE b value. The research results can provide reference value for the shear failure behavior of granite-concrete interface in engineering. |
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