ABSTRACT:

Microwave irradiation leads to the obvious weakening in strength and hardness on rock, and irradiation distance is one of the crucial factors for the weakening. In this paper, a series of numerical experiments are carried out to investigate the relationship between the distance from microwave outlet port to treated rock surface and the influence on the electromagnetism, temperature and stress field in rock, by means of commercial code COMSOL. Two type rocks, such as limestone and granite, are chosen to be radiated under the different irradiation distance from 12 to 16 cm. The numerical experiment results show that: When irradiation distance remains constant, the electromagnetism, temperature and stress fields remain stable with several local peaks in treated rock. Irradiation distance has dramatic influences on the electromagnetism, temperature and stress fields on the local peak and trough distribution. When irradiation distance is small, the number of the local electromagnetism field peak is 1 or 2, and the weakening zone is relatively deep and narrow; with distance increasing, the number of local electromagnetism field peak shifts to 3 or more, but the weakening zone is relatively shallow and wide. The plastic region distribution patterns in treated rock are discussed under these cases also.

This content is only available via PDF.
You can access this article if you purchase or spend a download.