Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines

Shenyang, China

Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines

Shenyang, China
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Lu G.-M.,Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines | Li Y.-H.,Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines | Hassani F.,McGill University | Zhang X.-W.,Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2016

The microwave-assisted mechanical rock breaking system is a rock fragmentation method which uses the combination of microwave heating technology and the mechanical excavating technology. Different minerals have different degrees of absorption to microwave energy, so intergranular and transgranular fractures occur within the specimen after microwave radiation treatment, and the specimen is weakened and micro cracks are generated due to the internal stress caused by thermal expansion of different minerals within the rocks. This causes the rock strength to be reduced. Microwave power and exposure time are the important parameters to influence the mechanical properties of rocks. The point load strength, tensile strength and compressive strength decrease significantly with a certain power level of microwave radiation. The higher the microwave power and the longer the exposure time, the more the strength reduction. The numerical results are compared with the experimental ones and show that the strength reduction is much quicker by increasing the power level of microwave in shorter time of exposure. The life and penetration rate of cutters of the rock mechanical equipment can be increased by the strength reduction of rocks, which can contribute to resolving the disc cutter wear problem. Microwave-assisted mechanical rock breaking has significant influence on drilling, TBM tunnelling and realizing the continuous mining of metal mine. © 2016, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.


Lu G.-M.,Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines | Lu G.-M.,Northeastern University China | Li Y.-H.,Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines | Li Y.-H.,Northeastern University China | And 4 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2015

In order to study the long-term stability of engineering rock mass under cyclic loading, various uniaxial tests are conducted on yellow sandstone under different maximum stresses and stress amplitudes using the rock mechanics test system Rockman207. The laboratory investigation results show that the fatigue failure of yellow sandstone is controlled by the axial strain, lateral strain and volumetric strain of the complete stress-strain curve. There is an initial failure in the process of fatigue tests, and the initial failure occurs at peak strength or behind peak strength of the control curve. The difference of strain rate is the essential factor of 3 stages of the axial and lateral irreversible deformation development laws, and the fatigue failure process of yellow sandstone is the accumulating process of axial and lateral irreversible deformations. The fatigue life of yellow sandstone can be predicted by using the cycles-maximum stress curve (N-S curve) under certain conditions. ©, 2015, Chinese Society of Civil Engineering. All right reserved.

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