EXPERIMENT STUDY ON MECHANICAL PROPERTIES OF BEDDING SHALE IN LOWER SILURIAN LONGMAXI SHALE SOUTHEAST CHONGQING
YAO Guanghua1，2，3，CHEN Qiao4，LIU Hong2，TAN Yanhu4，WANG Lisha4，DU Hongyu2，ZHU Honglin4
(1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；2. Chongqing Key Laboratory of Exogenic Mineralization and Mine Environment Chongqing Institute of Geology and Mineral Resource，Chongqing 400042，China；3. Chongqing Mineral Resources Development Company，Chongqing 400042，China；4. Research Center of Shale Gas Development Technology，Chongqing Institute of Green and Intelligent Technolog，Chinese Academy of Science，Chongqing 400714，China)
Abstract：We tested basic physical characteristics of the outcrop samples with developed beddings from the Lower Silurian Longmaxi in Southeast Chongqing. Based on these tests，we carried out the research of shale mechanical characteristics under the different bedding angle conditions. Our tests indicate that the uniaxial compressive strength of shale increases linearly with the increase of the bedding angle of the samples. The extending direction of failure surface is consistent with the bedding angle when the angle is between 0°–45°. While the angel ranges from 60° to 90°，only a partial consistency between the crack distribution and angle of bedding was reached. Rock will produce the splitting failure because of the inconformity between the main failure surface extension and the angle of bedding. The tensile strength of samples range from 2.872 0 MPa to 10.490 0 MPa，and the stiffness 556.62–1 842.98 MPa，which shows wide dispersion. when the angle between core drilling direction and layers changes the mechanical properties of shale vary greatly.，we should take into account the anisotropic of mechanical characteristics during the designs of drilling and fracturing of shale gas.
2015, Vol. 34 
