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Experimental Approach to Understanding the Initiation of Fractures in a Cooling Granite

机译:理解冷却花岗岩中裂缝启动的实验方法

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The onset of fracturing by thermal contraction was investigated by cooling fracture-free "hydrothermally healed granite", to simulate the processes of (micro)crack generation in partially solidified (or 'plastic') granitic rock. To form "hydrothermally healed" granite, microcracks are healed in a long duration, high temperature hydrothermal reaction process. Acoustic emissions corresponding to (micro)crack generation in cooling hydrothermally healed granite samples were detected at ~360°C, which was inferred to be initiated by thermal contraction processes. The use of hydrothermally healed granite in simulation experiments provides an effective means to advance the experimental study and development of natural (permeable) fracture systems.
机译:通过冷却无骨折的“水热愈合的花岗岩”来研究通过热收缩的压裂的发病,以模拟部分固化(或'塑料')花岗岩岩石中的(微观)裂纹的过程。为了形成“水热愈合”花岗岩,微裂纹在长时间愈合,高温水热反应过程中愈合。在〜360℃下检测到冷却水热愈合的花岗岩样品中对应于(微)裂纹的声学发射,其推断出通过热收缩过程引发。在仿真实验中使用水热愈合的花岗岩提供了一种有效的手段,用于推进天然(可渗透)骨折系统的实验研究和开发。

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