CALCULATING SAFE DISTANCE FROM MINE EXPLOSION AREA DURING CONSTRUCTION PROCESS OF TAM DAO I – TAM DAO II ROUTE

Abstract

Tam Dao I – Tam Dao II route is inside Tam Dao National Parks with the length of 9.16 km and width of 3.5 m. The route is constructed on land with ground elevation fluctuate from +7.4 to +11.5 m, geological structure consisting of rocks Tam Dao formed with erupted magma, which create a necessity to use drills and explosions. RocFall model and iGeoHazard software were applied to simulate the range and safe radius while using 3800 kg of dynamite, results showed: the distance needed to be safe from concussion and blast wave was 100 m from the center of the blast, the furthest rolling and scattered rocks could be seen was 200 m from the blast and following valley.

To minimize the effect of mine explosion, this article suggested: control mine explosions with differential explosive devices, shallow holes; mines are detonated at a specific time during the day, setting up fence systems at detonated positions with a distance less than that of simulated impacts.