›› 2005, Vol. 26 ›› Issue (8): 1216-1220.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Analysis of hydraulic fracturing and calculation of critical internal water pressure of rock fracture

LI Zong-li1,2, ZHANG Hong-chao3, REN Qing-wen2, WANG Ya-hong2   

  1. LI Zong-li1,2, ZHANG Hong-chao3, REN Qing-wen2, WANG Ya-hong2
  • Received:2004-03-02 Online:2005-08-10 Published:2013-12-26

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Abstract: Hydraulic fracturing is one of important effect factors in water gushing out of deep-buried tunnel construction and cracking and seepage of high head tunnel .Its failure mechanism study is a hot topic in geotechnical engineering fields. Based on stress state in fracture surface and fracture mechanics, the fracture propagation is divided into tension-shear and compression-shear mixed cracking. Using fracture propagation engineering criterion, calculation formulae of critical internal water pressure of two kinds of failure model are obtained respectively; and its effect laws as fracture direction and lateral geo-stress coefficient are studied. The study shows that critical internal pressure of two kinds of model is not varied as fracture direction changing when the lateral pressure coefficient equals 1.0. Under tension-shear complex model, fracture is most easily fracturing when fracture direction is parallel with direction of principal stress. Under compression-shear mixed model ,distribution law of critical internal water pressure is same as tension-shear complex model when ( ) large than 1.0. But fracture is most easily fracturing when ( ) less than 1.0 and fracture direction are 45°or 135°angle with principal stress.

Key words: rock fracture, hydraulic fracturing, fracture mode, critical internal water pressure

CLC Number: 

  • TU 452
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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