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首页> 外文会议>SPE/ISRM symposium on rock mechanics in petroleum engineering >An experimental analysis of anelastic strain recovery of synthetic sandstone subjected to polyaxial stress
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An experimental analysis of anelastic strain recovery of synthetic sandstone subjected to polyaxial stress

机译：多轴应力下合成砂岩非弹性应变恢复的实验分析

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This paper describes, for the first time, a unique investigation of ASR using synthetic sandstone samples formed under applied polyaxial stresses. The strain relaxation in all tests invariably gave a good indication of the principal stress orientations. Measured strain relaxation ratios were approximately equal to corresponding applied stress ratios up 1.5, suggesting that, with a knowledge of one of the principal stresses, in regions of low stress anisotropy, stres can be calculated directly from strain. At stress ratios of 2 and above, corresponding relaxation strain ratios were variable, time-dependent and generally higher than the stress ratios. This suggests that shear stresses associated with stress anisotropy result in material damage that is partly responsible for the measured relaxation strain. Correction of strains for "Poisson" effects reduced data scatter at the higher stress anisotropies but gave a poor correlation between applied stress and a) strain magnitudes, b) calculated stress, for a measured Poisson ratio (v) of 0.3. lower v values gave better data fit, but it is suggested that the use of a Poisson correction of the measured strain, using low values of v, is unrealistic. The strain relaxation mode was assessed using the Kelvin-Voight model. The strain relaxation curves are not perfectly linear in normalised strain/time space. The material behaviour cannot therefore be fully reproduced using this visco-elastic model. Anisotropic samples especially seem to deviate from a linear trend, again suggesting that stress anisotropy and related fabric damage have an effect on the ASR response.
机译：本文首次描述了使用在多轴应力作用下形成的合成砂岩样品对ASR进行的独特研究。所有测试中的应变松弛始终很好地表明了主应力方向。测得的应变松弛率大约等于相应的外加应力比率，最高为1.5，这表明，在掌握了一种主应力的情况下，在低应力各向异性的区域中，可以直接从应变计算出应力。在应力比为2或更高时，相应的松弛应变比是可变的，随时间变化的，并且通常高于应力比。这表明与应力各向异性相关的剪应力导致材料破坏，这部分是所测量的松弛应变的部分原因。针对“泊松”效应的应变校正减少了较高应力各向异性下的数据散布，但在所测应力与泊松比（v）为0.3时，施加的应力与a）应变幅度，b）计算应力之间的相关性较差。较低的v值可提供更好的数据拟合度，但建议使用较低的v值对测得的应变进行泊松校正是不现实的。使用Kelvin-Voight模型评估应变松弛模式。应变松弛曲线在归一化的应变/时间空间中不是完全线性的。因此，使用这种粘弹性模型无法完全再现材料的行为。各向异性样品尤其似乎偏离线性趋势，这再次表明应力各向异性和相关的织物破坏对ASR响应有影响。

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