| 黄彦华,杨圣奇*,刘相如.类岩石材料力学特性的试验及数值模拟研究[J].实验力学,2014,29(2):239~249 |
| 类岩石材料力学特性的试验及数值模拟研究 |
| Experimental and Numerical Study on the Mechanical Characteristics of Rock-Like Materials |
| 投稿时间：2013-07-04 修订日期：2013-10-06 |
| DOI：10.7520/1001-4888-13-105 |
| 中文关键词: 类岩石材料 力学特性 高径比 围压 颗粒流程序 |
| 英文关键词:rock-like material mechanical characteristics height-diameter ratio confining pressure particle flow code (PFC2D) |
| 基金项目:国家自然科学基金资助项目(41272344)；江苏省自然科学基金资助项目(BK2012568) |
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| 中文摘要: |
| 在进行多组不同配比类岩石材料单轴压缩试验和巴西试验的基础上，详细分析了石膏水泥比和石英砂含量对类岩石材料的单轴抗压强度、抗拉强度及弹性模量等力学参数的影响规律，力图找到适合模拟现场砂质泥岩的类岩石材料及配合比。利用颗粒流程序(PFC)模拟，进一步研究了高径比和围压对类岩石材料力学特性的影响。结果表明：随着石膏水泥比的增大，抗压强度和弹性模量均逐渐减小，而抗拉强度逐渐增大；随着石英粉含量的增大，抗压强度和弹性模量均先增大后减小，而抗拉强度则为先减小后增大。结合单轴压缩过程的声发射特征，揭示了裂纹扩展与声发射有密切的关系。PFC2D模拟获得的力学参数与室内试验相近，破裂模式也与实际情况相似。通过尺寸效应的研究可知试样的高径比在2.0~2.5较合理。随着围压的增大，试样的峰值强度、残余强度、峰值应变及弹性模量等力学参数均增大，且围压会改变试样的破裂模式。 |
| 英文摘要: |
| Based on uniaxial compression and Brazilian tests of multiple sets of rock-like materials with different proportions, the effect of gypsum-cement ratio and quartz sand content on the mechanical parameters such as uniaxial compressive strength, uniaxial tensile strength and elastic modulus etc of rock like materials was detailed analyzed to try to find a rock like material and proportion suitable analog field sandy mudstone. PFC (Particle flow code) was used to investigate the effect of height-diameter ratio and confining pressure on the mechanical properties of rock-like materials. Results show that with the increase of gypsum cement ratio, the compressive strength and elastic modulus decrease gradually, but tensile strength increases gradually, while with the increase of quartz sand content, the compressive strength and elastic modulus first increase then decrease, but tensile strength first decreases then increases. Acoustic emission reveals that there is a close relationship between crack propagation and acoustic emission. Mechanical parameters obtained by PFC2D simulation agree well with the experimental data. Failure mode is also similar to the actual situation. Height-diameter ratio of specimen is reasonable in the range of 2.0 to 2.5. With the confining pressure increases, the mechanical parameters such as peak strength, residual strength, peak strain and elastic modulus etc increase, the failure mode may be changed by confining pressure. |
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