core discing
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Rock Stress ◽  
2020 ◽  
pp. 237-243
Author(s):  
K. Matsuki ◽  
N. Kaga ◽  
T. Yokoyama ◽  
N. Tsuda

Rock Stress ◽  
2020 ◽  
pp. 245-251
Author(s):  
N. Kaga ◽  
K. Matsuki ◽  
T. Yokoyama ◽  
N. Tsuda

2020 ◽  
Vol 27 (10) ◽  
pp. 2822-2833
Author(s):  
Min-zong Zheng ◽  
Shao-jun Li ◽  
Zou Yao ◽  
Ao-dong Zhang ◽  
Ding-ping Xu ◽  
...  
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2020 ◽  
Vol 13 (12) ◽  
Author(s):  
Songqing Lin ◽  
Chuanqing Zhang ◽  
Hui Zhou ◽  
Feng Dai

2017 ◽  
Vol 77 (3) ◽  
pp. 1179-1189 ◽  
Author(s):  
Long An ◽  
Changyu Jin ◽  
Dong Liu ◽  
Chenggong Ding ◽  
Xinghang Dai

2011 ◽  
Vol 55-57 ◽  
pp. 945-949
Author(s):  
An Nan Jiang ◽  
Zheng Wen Zeng ◽  
Jun Xiang Wang

Identifying ground stress based on rock core discing can save a lot of surveying cost, so studying “rock core disicing” has great meaning. Aiming at the limitation of conventional methods, the particle swarm optimization (PSO) arithmetic is introduced to be combined with numerical simulation, so as to identify the ground stress based on rock core disicing observation. The objective function of optimization is constructed by combing Mohr-Coulomb criterion and tension criterion. Adopts dynamically adjusting momentum term method and steric compression method so as to improve the PSO in convergence velocity and globally searching property. The proposed method is mentioned and used to identify the ground stress of Bakken formation in USA. The arithmetic has good convergence speed and the identified results are coincident with the former reported results.


2011 ◽  
Vol 187 ◽  
pp. 565-569
Author(s):  
An Nan Jiang ◽  
Zheng Wen Zeng

Aiming at the complexity of rock discing mechanics, and the theory being not mature, the paper carried out three-dimensional numerical simulation for rock core discing based on strain soft model. The strain soft theory is introduced firstly, then numerically simulated how the depth of lug boss and original stress affect the rock core destroy pattern(discing if occurs, the thickness of disk), obtained the characters of rock core discing. Along with the drilling depth increases, the stress concentration scope below lug boss also increases, as well as the pressure stress concentration degree of side corner below of lug boss. Rock core discing can be induced respectively by shear action and tension action, sometimes it is combined by both of them. The destroy pattern of them especially destroy sequence are different. The strain soft numerical simulation could be used in original stress feedback analysis, has significant meaning.


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