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The effect of the intermediate principal stress on fault formation and fault angle in siltstone

机译:中间主应力对粉砂岩断层形成和断层角度的影响

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We conducted true triaxial compression tests on specimens prepared from two siltstone core sections, one above and one below the Chelungpu Fault, Taiwan. For different constant δ2 and δ3 magnitudes, the maximum principal stress (δri) was raised until a post failure stage was reached, and a through-going fault had developed. Despite differences between the properties of the two cores, in all tests peak δ1 increased as δ2 was set at higher levels than δ3, in contrast to Mohr-Coulomb condition predictions. The fault-normal vector was aligned with the δ3 direction and made an angle (8) with δ1 direction. The angle 8, which corresponds to fault dip in case of normal faulting, increased monotonically with δ2 for fixed δ3, a variation that is also inconsistent with Mohr-Coulomb theory. The results of shear band localization theory are used with fault angles observed for axisymmetric compression and deviatoric pure shear to infer properties of the inelastic constitutive behavior. These properties are significantly different for the two cores. Using them to predict 8 for other deviatoric stress states yields good agreement with the observations for core II and acceptable agreement for core I. The results are used to predict the angle variation for constant mean normal stress (θ decreases as the deviatoric stress state varies from axisymmetric extension to axisymmetric compression) and at fixed deviatoric stress state {8 decreases monotonically with increasing mean normal stress).
机译:我们对台湾粉岭铺断裂的两个粉砂岩岩心段进行了真正的三轴压缩试验,其中一个在上面,另一个在下面。对于不同的恒定δ2和δ3幅值,最大主应力(δri)会升高,直到达到破坏后的阶段,并形成了贯穿的断层。尽管两个岩心的特性有所不同,但与Mohr-Coulomb条件预测相反,在所有测试中,随着δ2的设置高于δ3,峰值δ1会增加。断层法向矢量与δ3方向对齐,与δ1方向成角度(8)。角度8(对应于正常断层情况下的断层倾角)对于固定的δ3随δ2单调增加,这一变化也与Mohr-Coulomb理论不一致。将剪切带局部化理论的结果与轴对称压缩和偏向纯剪切所观察到的断层角一起使用,以推断非弹性本构行为的性质。对于两个核心,这些属性明显不同。用它们来预测其他偏应力状态的8个,与岩心II的观测结果和岩心I的观测结果具有良好的一致性。结果用于预测恒定平均法向应力的角度变化(随着偏应力状态的变化,θ减小)。轴对称延伸到轴对称压缩)并在固定的偏应力状态下(8随平均法向应力的增加而单调减小)。

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