REGIONAL STRESS FIELD OPTIMIZATION METHOD FOR MAIN HAULAGEWAY

摘要

Disclosed is a regional stress field optimization method for a main haulageway (1). First, before boring the main haulageway (1), measuring the crustal stress at passageways near and in communication with the main haulageway (1); calculating and analyzing the position of the greatest difference of principal stress (3) on the wall after the main haulageway (1) is bored; boring multiple pressure-relieving passageways (2) near the main haulageway (1) at appropriate layers above or below the position of the greatest difference of principal stress (3), and using the pressure-relieving passageways (2) to relieve the pressure of the main haulageway (1); constructing from the inside of the pressure-relieving passageways (2) floor stress optimization holes (4) toward the position of the greatest difference of principal stress (3), and performing static blasting; after the pressure-relieving passageways (2) deform to a certain degree, boring the main haulageway (1), and measuring, inside of the main haulageway (1), the crustal stress and calculating the position of the greatest difference of principal stress (3) on the wall; constructing from the inside of the main haulageway (1) a wall stress optimization hole (5) toward the position of the greatest difference of principal stress (3) on the wall, and performing static blasting to relieve pressure, thereby optimizing the regional stress field of the main haulageway (1). The present method relieves the pressure using pressure-relieving passageways and performs static blasting twice to relieve pressure, once before the boring and once after the boring, at the position of the greatest difference of principal stress on the wall, thereby optimizing the regional stress field of the main haulageway with good effects.