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首页> 外文期刊>Journal of Engineering Mechanics >Acoustic measurements of the anisotropy of dynamic elastic and poromechanics moduli under three stress/strain pathways
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Acoustic measurements of the anisotropy of dynamic elastic and poromechanics moduli under three stress/strain pathways

机译：在三种应力/应变路径下的动态弹性和随机力学模量各向异性的声学测量

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A series of triaxial compression experiments have been conducted to investigate the effects of induced stress on the anisotropy developed in dynamic elastic and poroelastic parameters in rocks. The measurements were accomplished by utilizing an array of piezoelectric compressional and shear wave sensors mounted around a cylindrical sample of porous Berea sandstone. Three different types of applied states of stress were investigated using hydrostatic, triaxial, and uniaxial strain experiments. During the hydrostatic experiment, where an isotropic state of stress was applied to an isotropic porous rock, the vertical and horizontal acoustic velocities and dynamic elastic moduli increased as pressure was applied and no evidence of stress induced anisotropy was visible. The poroelastic moduli (Biot's effective stress parameter, (x) decreased during the test but also with no evidence of anisotropy. The triaxial compression test involved an axisymmetric application of stress with an axial stress greater than the two constant equal lateral stresses. During this test a marked anisotropy developed in the acoustic velocities, and in the dynamic elastic and poroelastic moduli. As axial stress increased the magnitude of the anisotropy increased as well. The uniaxial strain test involved axisymmetric application of stresses with increasing axial and lateral stresses but while maintaining a zero lateral strain condition. The uniaxial strain test exhibited a quite different behavior from either the triaxial or hydrostatic tests. As both the axial and lateral stresses were increased, an anisotropy developed early in the loading phase but then was effectively "locked in" with little or no change in the magnitude of the values of the acoustic velocities, or the dynamic elastic and poroelastic parameters as stresses were increased. These experimental results show that the application of triaxial states of stress induced significant anisotropy in the elastic and poroelastic parameters in porous rock, while under the uniaxial strain condition the poromechanics, Biot's effective stress parameter, exhibited the largest variation among the three test conditions.
机译：已经进行了一系列的三轴压缩实验，以研究诱导应力对岩石动态弹性和多孔弹性参数中形成的各向异性的影响。通过利用安装在多孔Berea砂岩圆柱样品周围的压电压缩和剪切波传感器阵列完成测量。使用静水压，三轴和单轴应变实验研究了三种不同类型的应力施加状态。在流体静力试验中，向各向同性的多孔岩石施加了各向同性的应力状态，随着施加压力，垂直和水平声速以及动弹性模量都增加了，并且看不到应力诱发各向异性的迹象。在测试过程中，孔隙弹性模量（Biot有效应力参数，（x）减小了，但也没有各向异性的迹象）。随着轴向应力的增加，各向异性的大小也随之增加;单轴应变试验涉及轴对称施加应力，同时轴向和侧向应力增加，但同时保持零横向应变条件。单轴应变试验表现出与三轴或静水压试验完全不同的行为。随着轴向和横向应力的增加，各向异性在加载阶段早期发展，但随后几乎没有被“锁定”或声速或dyn值的大小没有变化随着应力的增加，弹性弹性和多孔弹性参数也随之增加。这些实验结果表明，三轴应力状态的应用在多孔岩石的弹性和多孔弹性参数中引起了显着的各向异性，而在单轴应变条件下，比奥的有效应力参数在三项测试条件下表现出最大的变化。

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