公开(公告)号：US20210116341A1

公开(公告)日：2021-04-22

申请号：US17137388

申请日：2020-12-30

Applicant: Chengdu University of Technology

Inventor： Hao Zhang ,  Bin Yang ,  Ying Zhong ,  Yang Yang ,  Jiping She ,  Guanchang Pan ,  Kun Chang ,  Xinyang Wang

IPC: G01N3/08 ,  G01N33/24 ,  E21B49/02

Abstract: The invention discloses an experimental test method for subcritical propagation rate of rock fractures based on triaxial stress-strain curve, including: Step 1: preparing test sample core for experiment; Step 2: putting core into triaxial rock mechanics test system, applying constant radial confining pressure to core, and applying axial stress in the axial direction until the core is macroscopically damaged; recording experimental parameters of axial stress, strain and corresponding loading time of the core; Step 3: drawing stress-strain curve of the test core according to detection data points of axial stress and axial strain; Step 4: in the stress-strain curve of the test core, starting time and ending time of the subcritical propagation stage of fractures inside the core correspond to the initiation stress σci and damage stress σcd, respectively, and calculating subcritical propagation rate of the subcritical fracture propagation stage of the test core.

公开(公告)号：US10989639B1

公开(公告)日：2021-04-27

申请号：US17137388

申请日：2020-12-30

Applicant: Chengdu University of Technology

Inventor： Hao Zhang ,  Bin Yang ,  Ying Zhong ,  Yang Yang ,  Jiping She ,  Guanchang Pan ,  Kun Chang ,  Xinyang Wang

IPC: G01N3/08 ,  G01N33/24 ,  E21B49/02

Abstract: The invention discloses an experimental test method for subcritical propagation rate of rock fractures based on triaxial stress-strain curve, including: Step 1: preparing test sample core for experiment; Step 2: putting core into triaxial rock mechanics test system, applying constant radial confining pressure to core, and applying axial stress in the axial direction until the core is macroscopically damaged; recording experimental parameters of axial stress, strain and corresponding loading time of the core; Step 3: drawing stress-strain curve of the test core according to detection data points of axial stress and axial strain; Step 4: in the stress-strain curve of the test core, starting time and ending time of the subcritical propagation stage of fractures inside the core correspond to the initiation stress σci and damage stress σcd, respectively, and calculating subcritical propagation rate of the subcritical fracture propagation stage of the test core.