东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (7): 1028-1033.DOI: 10.12068/j.issn.1005-3026.2016.07.025

• 资源与土木工程 • 上一篇    下一篇

非均匀孔隙压力场导向水压裂纹扩展机制

卢义玉1,2， 贾云中1,3， 汤积仁1,2， 宋晨鹏1,2   

  1. (1. 重庆大学 煤矿灾害动力学与控制国家重点实验室， 重庆400030； 2. 重庆大学 复杂煤气层瓦斯抽采国家地方联合工程实验室， 重庆400030； 3. Department of Energy and Mineral Engineering， EMS Energy Institute and G3 Center， The Pennsylvania State University， University Park， PA 16802， USA)
  • 收稿日期:2015-06-05 修回日期:2015-06-05 出版日期:2016-07-15 发布日期:2016-07-13
  • 通讯作者: 卢义玉
  • 作者简介:卢义玉(1972-)，男，湖北京山人，重庆大学“长江学者奖励计划”特聘教授，博士生导师.
  • 基金资助:
    国家重点基础研究发展计划项目(2014CB239206)； 国家自然科学基金青年基金资助项目(51404045)； 长江学者和创新团队发展计划项目(IRT13043)； 国家建设高水平大学公派研究生项目(留金发［2015］3022号).

Mechanism of Hydrofracture Propagation Control by Non-uniform Pore Pressure Field

LU Yi-yu1,2， JIA Yun-zhong1,3， TANG Ji-ren1,2， SONG Chen-peng1,2   

  1. 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control， Chongqing University， Chongqing 400030， China; 2. National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam， Chongqing University， Chongqing 400030， China; 3. Department of Energy and Mineral Engineering， EMS Energy Institute and G3 Center， The Pennsylvania State University， University Park， PA 16802， USA.
  • Received:2015-06-05 Revised:2015-06-05 Online:2016-07-15 Published:2016-07-13
  • Contact: JIA Yun-zhong
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摘要： 为揭示非均匀孔隙压力场对水压裂纹扩展的影响，采用多孔弹性力学、断裂力学、渗流力学和热弹性力学理论，建立了考虑孔隙压力的水压裂纹尖端应力强度因子计算模型，并采用室内实验和RFPA2D-Flow数值模拟软件进一步分析了非均匀孔隙压力场对水压裂缝扩展的导向机制.研究结果表明:孔隙压力场的存在可以增大水压裂纹尖端的应力强度因子，从而诱导水压裂缝沿高孔隙压力方向扩展；同时，水压裂纹尖端的应力强度因子会随着孔隙压力增大而增大，孔隙压力越大，裂纹的偏转幅度也会越大.

关键词: 非均匀孔隙压力场, 水压裂纹, 应力强度因子, 裂纹导向, RFPA2D-Flow

Abstract: To reveal the effect of non-uniform pressure on hydraulic fractures propagation， the porous elasticity mechanics， fracture mechanics， seepage mechanics and thermal elasticity mechanics were used to build a hydrofracture crack tip stress intensity factor calculation model considering the pore pressure. Then， through laboratory experiments and numerical simulation， the guiding mechanism of pore pressure on hydrofracture was verified. The research results showed that pore pressure can increase the crack tip stress intensity factor of hydrofracture， which causes the fractures extend to the high pore pressure region; at the same time， stress intensity factor of hydrofracture will be enlarged with the increase of pore pressure. A larger pore pressure will lead to larger deflection amplitude of fractures.

Key words: non-uniform pore pressure field, hydrofracture, stress intensity factor, fracture propagation control, RFPA2D-Flow

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