| 单轴应力下带钻孔花岗岩注入高温蒸汽破坏特征研究 |
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| 引用本文： | 武晋文,冯子军,梁栋,鲍先凯.单轴应力下带钻孔花岗岩注入高温蒸汽破坏特征研究[J].岩土力学,2019(7):2637-2644. |
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| 作者姓名： | 武晋文 冯子军 梁栋 鲍先凯 |
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| 作者单位： | 中北大学理学院;太原理工大学矿业工程学院;中国辐射防护研究院中核高放废物地质处置评价技术重点实验室;内蒙古科技大学土木工程学院 |
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| 基金项目： | 国家自然科学基金青年基金资助项目(No.51504220,No.51404161)~~ |
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| 摘 要： | 大型水力压裂是干热岩地热能开发中人工储留层建造的最有效手段,其核心力学问题为高温、高压下岩石的水力破岩机制。通过单轴应力下带钻孔花岗岩注入高温蒸汽破坏试验,研究固-热耦合作用下花岗岩的水力破岩机制。结果表明:高温对花岗岩破裂有很大的促进作用,热效应导致强度弱化,降低破裂压力。高速率注入430℃和350℃蒸汽破坏试验中,破裂压力比常温水压裂至少降低58%;低速率注入400℃和450℃蒸汽破坏试验中,花岗岩破裂压力比常温水压裂降低75%。注蒸汽破坏过程可分为热破裂损伤和宏观裂缝扩展两个阶段。高温蒸汽产生的热应力在钻孔周围随机发生热破裂,随着注入蒸汽时间的增加,热破裂范围由钻孔附近逐渐向远处扩展,热破裂分布密度增大,为宏观裂缝的产生提供便利条件。初始宏观裂缝首先出现在钻孔两侧,沿着最终形成的宏观裂缝轨迹扩展,直到试样破坏。与常温水压裂相比,低速率注蒸汽破坏是一个缓慢的延性拉破坏过程,裂缝相对钻孔不对称扩展,宽度小于水力压裂裂缝宽度。
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| 关 键 词： | 水力压裂 花岗岩 高温岩体 声发射 |
Characteristics of granite failure by injecting high-temperature-vapour under uniaxial stress |
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| WU Jin-wen,FENG Zi-jun,LIANG Dong,BAO Xian-kai.Characteristics of granite failure by injecting high-temperature-vapour under uniaxial stress[J].Rock and Soil Mechanics,2019(7):2637-2644. |
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| Authors: | WU Jin-wen FENG Zi-jun LIANG Dong BAO Xian-kai |
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| Institution: | (School of Science, North University of China, Taiyuan, Shanxi 030051, China;College of Mining Technology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China;CNNC Laboratory on Geological Disporsal of High-level Radioactive Waste, China Institute for Radiation Protection, Taiyuan, Shanxi 030024, China;School of Civil Engineering, Inner M ongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China) |
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| Abstract: | WU Jin-wen;FENG Zi-jun;LIANG Dong;BAO Xian-kai(School of Science, North University of China, Taiyuan, Shanxi 030051, China;College of Mining Technology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China;CNNC Laboratory on Geological Disporsal of High-level Radioactive Waste, China Institute for Radiation Protection, Taiyuan, Shanxi 030024, China;School of Civil Engineering, Inner M ongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China) |
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| Keywords: | hydraulic fracturing granite hot dry rock acoustic emission |
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