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首页> 外文会议>Second Biot Conference on Poromechanics Aug 26-28, 2002 Grenoble, France >Healing of fluid-filled microcracks
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Healing of fluid-filled microcracks

机译：充满流体的微裂纹的修复

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摘要

The formation and subsequent healing of cracks and crack networks may control such diverse phenomena as the transport of radioactive materials in ceramics around nuclear reactors, the recurrence of earthquakes, and fluid migration in the Earth's crust. Although the process of crack opening has been widely studied for many years, the mechanism of crack healing remains controversial mainly because the driving forces controlling this process are not well understood. Here, we present the resuhs of experiments in which a liquid was injected into an elastic gel to obtain penny-shaped cracks that were subsequently allowed to close and heal. Depending on the properties of the gel and the injected liquid, two modes of healing were obtained. In the first mode, the crack heals completely through a linear process. The unexpected second mode of healing is nonlinear and is characterized by a "zipper-like" closure as the front moving along the crack margins may leave liquid inclusions trapped in the solid. This process is driven by the elastic rebound of the surrounding medium and the reduction in interfacial energy near the crack front. Our experiments reveal how linear arrays of fluid inclusions may be captured along preexisting fracture planes. This explains why previously fractured rocks may contain small amounts of fluids which permanently modify material properties.
机译：裂缝和裂缝网络的形成和随后的修复可能控制各种现象，例如放射性物质在核反应堆周围的陶瓷中的传输，地震的复发以及地壳中的流体迁移。尽管裂纹开裂的过程已被广泛研究了很多年，但是裂纹愈合的机制仍存在争议，这主要是因为控制该过程的驱动力尚未得到很好的理解。在这里，我们介绍了将液体注入弹性凝胶中以获得一分钱形裂缝的实验结果，这些裂缝随后被封闭并愈合。根据凝胶和注入的液体的性质，获得了两种治疗方式。在第一种模式下，裂纹通过线性过程完全愈合。出乎意料的第二种修复方式是非线性的，其特征是“拉链状”闭合，因为沿裂纹边缘移动的前部可能将液体夹杂物留在固体中。这个过程是由周围介质的弹性回弹和裂纹前沿附近界面能的减少所驱动的。我们的实验揭示了如何沿既有的裂缝平面捕获流体包裹体的线性阵列。这解释了为什么先前破裂的岩石可能包含少量的流体，这些流体会永久改变材料的性能。

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