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Structural Engineering and Mechanics
  Volume 74, Number 2, April25 2020, pages 283-296
DOI: http://dx.doi.org/10.12989/sem.2020.74.2.283
 


Study on rock fracture behavior under hydromechanical loading by 3-D digital reconstruction
Miaomiao Kou, Xinrong Liu and Yunteng Wang

 
Abstract
    The coupled hydro-mechanical loading conditions commonly occur in the geothermal and petroleum engineering projects, which is significantly important influence on the stability of rock masses. In this article, the influence of flaw inclination angle of fracture behaviors in rock-like materials subjected to both mechanical loads and internal hydraulic pressures is experimentally studied using the 3-D X-ray computed tomography combined with 3-D reconstruction techniques. Triaxial compression experiments under confining pressure of 8.0 MPa are first conducted for intact rock-like specimens using a rock mechanics testing system. Four pre-flawed rock-like specimens containing a single open flaw with different inclination angle under the coupled hydro-mechanical loading conditions are carried out. Then, the broken pre-flawed rock-like specimens are analyzed using a 3-D X-ray computed tomography (CT) scanning system. Subsequently, the internal damage behaviors of failed pre-flawed rock-like specimens are evaluated by the 3-D reconstruction techniques, according to the horizontal and vertical cross-sectional CT images. The present experimental does not only focus on the mechanical responses, but also pays attentions to the internal fracture characteristics of rock-like materials under the coupled hydro-mechanical loading conditions. The conclusion remarks are significant for predicting the rock instability in geothermal and unconventional petroleum engineering.
 
Key Words
    hydro-mechanical loading; flaw inclination angle; internal fracture behaviors; rock-like materials; 3-D reconstruction
 
Address
Miaomiao Kou, Xinrong Liu and Yunteng Wang: School of Civil Engineering, Chongqing University, Chongqing, 400045, China;
Miaomiao Kou: School of Civil Engineering, Qingdao University of Technology, Qingdao, 266033, China;
Miaomiao Kou: Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao, 266033, China
 

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