高温条件下花岗岩水压致裂的实验研究

发布时间：2018-05-21 07:42

  本文选题：热力耦合 + 水压致裂　； 参考：《中国矿业》2017年07期

【摘要】：人工储留层建造是高温岩体地热开采关键技术之一,其核心是巨型水压致裂,关键科学问题是岩石热力耦合作用下的水压致裂理论。采用自主研制的"600℃20 MN伺服控制高温高压岩体三轴试验机",开展了Φ200mm×400mm的鲁灰花岗岩大试样高温三轴应力下的水压致裂实验,分析了实验的水压加载曲线特征和裂缝最终形态。研究结果表明:随温度的升高,花岗岩裂缝开裂模式从脆性开裂转变为连续开裂;温度升高至300℃后,裂缝起裂的主控条件向温度转化;从室温到200℃之间,温度对花岗岩水压致裂影响的控制机理是岩石抗拉强度的下降,而200℃到400℃起裂压力的控制机理是温度下降引起的热应力。随着温度的升高,裂缝的扩展方向从轴向改变为优先向径向深处发展。
[Abstract]:The formation of artificial reservoir is one of the key techniques for geothermal exploitation of high temperature rock mass, the core of which is the giant hydraulic fracturing, and the key scientific problem is the hydraulic fracturing theory under the coupling of rock and heat. The hydraulic fracturing experiment of 桅 200mm 脳 400mm large sample of Lu-gray granite under high temperature triaxial stress was carried out by using "600C 20mn servo control high temperature and high pressure rock mass triaxial test machine" developed by ourselves. The characteristics of hydraulic loading curve and the final fracture morphology of the experiment were analyzed. The results show that with the increase of temperature, the fracture mode of granite changes from brittle cracking to continuous cracking, and when the temperature rises to 300 鈩，

本文编号：1918335