US 11,747,246 B2
Coal rock three-dimensional strain field visual system and method under complex geological structure
Zhiheng Cheng, Beijing (CN); Haobin Gao, Zhaoyuan (CN); Quanle Zou, Zhenping County (CN); Liang Chen, Beijing (CN); Jiakai Sun, Beijing (CN); Bichuan Zhang, Chongqing (CN); Fanjie Kong, Taiyuan (CN); Biao Liu, Xiangtan County (CN); and Ruizhi Wang, Chengdu (CN)
Assigned to NORTH CHINA INSTITUTE OF SCIENCE AND TECHNOLOGY, Beijing (CN); and CHONGQING UNIVERSITY, Chongqing (CN)
Filed by North China Institute Of Science And Technology, Beijing (CN); and Chongqing University, Chongqing (CN)
Filed on Jun. 16, 2021, as Appl. No. 17/349,262.
Claims priority of application No. 202010546108.6 (CN), filed on Jun. 16, 2020.
Prior Publication US 2021/0389219 A1, Dec. 16, 2021
Int. Cl. G01N 3/00 (2006.01); G01N 3/06 (2006.01); G01N 1/28 (2006.01); G01N 3/08 (2006.01); B33Y 10/00 (2015.01); B33Y 80/00 (2015.01)
CPC G01N 3/068 (2013.01) [G01N 1/2806 (2013.01); G01N 3/08 (2013.01); B33Y 10/00 (2014.12); B33Y 80/00 (2014.12); G01N 2203/0019 (2013.01); G01N 2203/0066 (2013.01); G01N 2203/0254 (2013.01); G01N 2203/0652 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A coal rock three-dimensional strain field visual method under a complex geological structure adopting a coal rock three-dimensional strain field visual system, comprising the following steps:
1) heating and melting a transparent base material to uniformly mix with ink microcapsules to prepare a 3D printing wire;
2) performing geological structure 3D printing in a model placing cavity of a stress condition simulation system to obtain a strain visual similar model;
3) utilizing the stress condition simulation system to simulate a stratum dip angle, a geological structure and a gas-containing situation;
4) after the model is cooled, applying a three-dimensional stress to the model, wherein the ink microcapsules are broken under the stress to dye surrounding materials and cracks;
5) utilizing a multi-angle high-speed camera to record a cracking and dyeing condition of the ink microcapsules inside the model; and
6) tracing a displacement of ink dots after the ink microcapsules are cracked, and reconstructing four-dimensional strain fields in the model;
wherein the coal rock three-dimensional strain field visual system, comprises: the stress condition simulation system and a strain monitoring system,
the stress condition simulation system comprises a similar simulation experiment rack, a loading system and a circular slideway;
the similar simulation experiment rack comprises a pressure chamber and two visual side plates; the pressure chamber is a rectangular frame body as a whole; two open ends of the rectangular frame body are sealed by the visual side plates; the pressure chamber and the visual side plates are enclosed to define the model placing cavity;
the loading system comprises a vertical axial pressure loading system and a horizontal stress loading system, the vertical axial pressure loading system loads set vertical loading force to a top and a bottom of the pressure chamber; the horizontal stress loading system loads set horizontal loading force to a left side of the pressure chamber;
the strain monitoring system comprises a plurality of multi-angle high-speed cameras;
and in work, the vertical axial loading system applies an uneven force on the model to simulate a time-varying law of three-dimensional strain fields inside coal and rock mass under the complex geological structure.