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Development of Anisotropy in Sandstone Subjected to Repeated Frost Action
Rock Mechanics and Rock Engineering ( IF 6.2 ) Pub Date : 2021-01-10 , DOI: 10.1007/s00603-020-02343-5
Hailiang Jia , Shun Ding , Fan Zi , Guoyu Li , Yuan Yao

In cold regions, the anisotropy of sedimentary rocks is modified by repeated frost action, potentially increasing the risks of rock engineering. Hence, a deep understanding of the development of rock anisotropy due to frost action is essential. In this work, two sets of sandstone samples were cored and used in experiments, which contained bedding planes either perpendicular or parallel to the height direction. The P-wave velocity, uniaxial compressive strength, tensile strength, and shear strength of samples were tested after different numbers of freeze–thaw cycles. Several anisotropic indexes were defined by the above parameters and their variations with freeze–thaw cycles were analysed. The results demonstrate that (1) the P-wave velocity, uniaxial compressive strength, tensile strength, and shear strength of both sets of sandstone samples decayed with increasing freeze–thaw cycles; however, (2) the initial values and decay rates of these parameters differed significantly between the two sets. (3) Sandstone bears strong inherent anisotropy and (4) it is enhanced by repeated frost action. Based on direct observations of bedding structures by magnetic resonance imaging, we suggest that the enhancement of anisotropy in sandstone results from a combination of its inherent anisotropy and anisotropic frost damage accumulation. Both originate from sandstone’s structure of interbedded coarse- and fine-grained layers.

中文翻译:

反复霜冻作用下砂岩各向异性的发展

在寒冷地区,沉积岩的各向异性被反复的霜冻作用改变,潜在地增加了岩石工程的风险。因此,深入了解由于霜冻作用引起的岩石各向异性的发展是必不可少的。在这项工作中,两组砂岩样品取芯并用于实验,其中包含垂直或平行于高度方向的层理平面。在不同次数的冻融循环后测试样品的纵波速度、单轴抗压强度、拉伸强度和剪切强度。上述参数定义了几个各向异性指标,并分析了它们随冻融循环的变化。结果表明:(1)纵波速度、单轴抗压强度、抗拉强度、两组砂岩样品的剪切强度随冻融循环次数的增加而衰减;然而,(2)这些参数的初始值和衰减率在两组之间存在显着差异。(3)砂岩具有很强的固有各向异性;(4)反复冻融作用增强。基于磁共振成像对层理结构的直接观察,我们认为砂岩中各向异性的增强是其固有的各向异性和各向异性冻害累积的共同作用。两者都起源于砂岩的粗粒和细粒层互层结构。(3)砂岩具有很强的固有各向异性;(4)反复冻融作用增强。基于磁共振成像对层理结构的直接观察,我们认为砂岩中各向异性的增强是其固有的各向异性和各向异性冻害累积的共同作用。两者都起源于砂岩的粗粒和细粒层互层结构。(3)砂岩具有很强的固有各向异性;(4)反复冻融作用增强。基于磁共振成像对层理结构的直接观察,我们认为砂岩中各向异性的增强是其固有的各向异性和各向异性冻害累积的共同作用。两者都起源于砂岩的粗粒和细粒层互层结构。
更新日期:2021-01-10
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