US 11,965,860 B2
Test system for hard rock breaking by microwave intelligent loading based on true triaxial stress
Xiating Feng, Shenyang (CN); Jiuyu Zhang, Shenyang (CN); Feng Lin, Shenyang (CN); Shiping Li, Shenyang (CN); Xiangxin Su, Shenyang (CN); and Tianyang Tong, Shenyang (CN)
Assigned to NORTHEASTERN UNIVERSITY, Shenyang (CN)
Appl. No. 17/618,378
Filed by Northeastern University, Shenyang (CN)
PCT Filed Dec. 8, 2020, PCT No. PCT/CN2020/134553
§ 371(c)(1), (2) Date Dec. 10, 2021,
PCT Pub. No. WO2022/116229, PCT Pub. Date Jun. 9, 2022.
Claims priority of application No. 202011399172.2 (CN), filed on Dec. 4, 2020.
Prior Publication US 2022/0412855 A1, Dec. 29, 2022
Int. Cl. E21D 9/00 (2006.01); E21B 7/00 (2006.01); G01N 3/06 (2006.01); G01N 3/12 (2006.01); G01N 3/60 (2006.01); G01N 22/02 (2006.01)
CPC G01N 3/068 (2013.01) [G01N 3/12 (2013.01); G01N 3/60 (2013.01); G01N 22/02 (2013.01); G01N 2203/0019 (2013.01); G01N 2203/0048 (2013.01); G01N 2203/0057 (2013.01); G01N 2203/0067 (2013.01); G01N 2203/06 (2013.01); G01N 2203/0647 (2013.01); G01N 2203/0658 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A test system for hard rock breaking by a microwave intelligent loading based on true triaxial stress, comprising: a true triaxial microwave-induced hard rock breaking device, a dynamic rock response monitoring and intelligent microwave parameter control system, a controller and a computer, wherein a true triaxial microwave-induced hard rock breaking device comprises a true triaxial stress loading device and a microwave-induced hard rock breaking device;
wherein the true triaxial stress loading device comprises a loading frame and a rock sample moving structure arranged in the loading frame, wherein the loading frame comprises an upper horizontal frame, a lower horizontal frame, a left vertical frame, a right vertical frame and a transverse frame arranged above the lower horizontal frame; the transverse frame comprises a front loading plate and a rear loading plate which are connected through four pull rods, and a sample loading platform is arranged on a side surface of the lower horizontal frame; a Y-direction load jack is mounted below the upper horizontal frame, and used for bearing a counteracting force in a Y direction; an X-direction load jack is mounted on one side, close to a rock sample, of the left vertical frame, and used for bearing a counteracting force in a X direction; a Z-direction load jack is mounted on the rear loading plate, and used for bearing a counteracting force in a Z direction; a space among a top of the lower horizontal frame, the X-direction load jack, the Y-direction load jack and the Z-direction load jack forms a triaxial pressure cavity used for containing the rock sample;
wherein the microwave-induced hard rock breaking device comprises an excitation cavity, a rectangular waveguide, a magnetron, a thermocouple, a circulator, a cold water circulation device, a flowmeter, a power meter, an automatic impedance tuner, a coupler, a microwave heater and a shielding cavity, wherein one end of the rectangular waveguide is connected with the excitation cavity, and the other end of the rectangular waveguide is connected with the microwave heater; the circulator, the coupler and the automatic impedance tuner are arranged on the rectangular waveguide sequentially; the magnetron is mounted in the excitation cavity, and connected with a microwave power supply; the magnetron is further connected with the cold water circulation device and the flowmeter sequentially, and the flowmeter is used for monitoring and displaying a cold water flow; the circulator is connected with a water load and the thermocouple sequentially, and the thermocouple is used for monitoring and displaying a temperature of the water load; the coupler is connected with the power meter and the automatic impedance tuner separately; the shielding cavity is arranged at an exterior of the rectangular waveguide, connected with the front loading plate fixedly, and used for shielding an electromagnetic energy absorbed by the rock sample;
wherein the dynamic rock response monitoring and intelligent microwave parameter control system comprises a CCD industrial camera, a temperature acquisition device and an anti-electromagnetic high-temperature resistant acoustic wave-acoustic emission integrated sensor, wherein the CCD industrial camera is used for recording images in the microwave-induced breaking process in real time, and transmitting the images to the computer for saving and displaying; the temperature acquisition device is used for acquiring the rock real-time temperature and transmitting the acquired temperature to the computer for saving and displaying; the anti-electromagnetic high-temperature resistant acoustic wave-acoustic emission integrated sensor is connected with an acoustic emission instrument, and is used for monitoring rock real-time wave velocity and acoustic emission, and transmitting the rock real-time wave velocity and the acoustic emission to the computer through the acoustic emission instrument for saving and displaying; an embedded program of the computer is used for computing wave velocity drop, acoustic emission cumulative number and acoustic emission rate according to the rock real-time wave velocity and the acoustic emission, and sending the rock real-time temperature, the wave velocity drop, the acoustic emission cumulative number and the acoustic emission rate to the controller; and the controller is used for adjusting a microwave power and a microwave heating time according to the wave velocity drop, the rock real-time temperature, the acoustic emission cumulative number and the acoustic emission rate.