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Fractured rock mass hydraulic fracturing under hydrodynamic and hydrostatic pressure joint action

  • Geological, Civil, Energy and Traffic Engineering
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Abstract

According to the stress state of the crack surface, crack rock mass can be divided into complex composite tensile-shear fracture and composite compression-shear fracture from the perspective of fracture mechanics. By studying the hydraulic fracturing effect of groundwater on rock fracture, the tangential friction force equation of hydrodynamic pressure to rock fracture is deduced. The hydraulic fracturing of hydrostatic and hydrodynamic pressure to rock fracture is investigated to derive the equation of critical pressure when the hydraulic fracturing effect occurs in the rock fracture. Then, the crack angle that is most prone to hydraulic fracturing is determined. The relationships between crack direction and both lateral pressure coefficient and friction angle of the fracture surface are analyzed. Results show that considering the joint effect of hydrodynamic and hydrostatic pressure, the critical pressure does not vary with the direction of the crack when the surrounding rock stationary lateral pressure coefficient is equal to 1.0. Under composite tensile-shear fracture, the crack parallel to the direction of the main stress is the most prone to hydraulic fracturing. Under compression-shear fracture, the hydrodynamic pressure resulting in the most dangerous crack angle varies at different lateral pressure coefficients; this pressure decreases when the friction angle of the fracture surface increases. By referring to the subway tunnel collapse case, the impact of fractured rock mass hydraulic fracturing generated by hydrostatic and hydrodynamic pressure joint action is calculated and analyzed.

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Authors and Affiliations

  1. School of Civil Engineering, Central South University, Changsha, 410075, China

    Zhong Zhou  (周中), Hao Yang  (杨豪), Xiang-can Wang  (王向灿) & Qi-fang Zhang  (张齐芳)

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  1. Zhong Zhou  (周中)
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  2. Hao Yang  (杨豪)
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  3. Xiang-can Wang  (王向灿)
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  4. Qi-fang Zhang  (张齐芳)
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Corresponding author

Correspondence to Zhong Zhou  (周中).

Additional information

Foundation item: Project(50908234) supported by the National Natural Science Foundation of China; Project(2011CB710604) supported by the Basic Research Program of China

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Zhou, Z., Yang, H., Wang, Xc. et al. Fractured rock mass hydraulic fracturing under hydrodynamic and hydrostatic pressure joint action. J. Cent. South Univ. 23, 2695–2704 (2016). https://doi.org/10.1007/s11771-016-3331-6

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  • DOI: https://doi.org/10.1007/s11771-016-3331-6

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