EFFECT OF BLASTING ON THE STABILITY OF LINING DURING EXCAVATION OF NEW TUNNEL NEAR THE EXISTING TUNNEL


 In recent years, experimental and numerical researches on the effect of blasting pressure stability existing tunnels was widely obtained. However, during excavation a new tunnel or expansion old an has disadvantages still unclear. Some were carried out to study relationship observed Peak Particle Velocity (PPV) lining areas along direction, due either lack in situ test data difficulty conducting field tests, particularly for that are usually vulnerable after several decades service. This paper introduces using methods with investigations surrounding rock mass tunnel. The research results show not only predicting damage zone under impact blast loads but also determination peak maximum explosion at same time surface working.