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GROUND VIBRATIONS DUE TO METRO BLASTING PROCESSES ARE ONE OF THE PROBLEMS & MAY CRACKS FEW BUILDINGS

 
 
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GROUND VIBRATIONS DUE TO METRO BLASTING PROCESSES ARE ONE OF THE PROBLEMS & MAY CRACKS FEW BUILDINGS
by System Administrator - Wednesday, 4 November 2015, 2:30 AM
 

By : M.S.Yatnatti Editor and Video Journalist Bengaluru : Blasting is blasting ,whether it is controlled blasting or non-controlled blasting. Its effect is disastrous .The after effects might surface after some time. Let the BMRCL accepts the fact that though controlled blasting technique that may minimizes the ground vibrations and reduces the speed of fly rocks but it cannot 100% totally guarantee that buildings above it may not crack as many building might not withstand controlled vibrations also as they are not calculated to take such loads..The cracks are fact and it need to resolve the issue .It cannot be adamant and arrogant on the issue as in Bale Pete several buildings have surfaced the cracks and BMRCL itself have propped up several pillar inside the buildings and residents are living in constant fear of their lives in their residences.

BMRCL should accept the fact and provide safety of life and solution to the problem by paying compensation: The effect of controlled blasting technique may not appear today but it might surface afterwards because it is synonymous to inner impact. Which may not be visible today but may cracks may surface latter. Let the Government take a policy decision on this matter. Development and Humanity should go hand in hand.

It is reported by experts that Ground vibrations due to blasting processes are one of the fundamental problems in the mining and civil excavation industry which may cause severe damage to the structures. It is mostly recommended that a detail comprehensive vibration control is required. This paper presents the results of ground induced vibration at a metro rail station excavation site in the heart-of-city of Bangalore. This study was carried out to control ground induced vibration, fly rock near to sensitive structures, mostly to the city civil court and the buildings of Sir M Visveswaraya college and like statue, school, public and private structures closed to 10-15m. More than 60 blasts were done under control supervision of government officials. The maximum charge/delay, charge per hole, delay in between holes and rows were established on basis geological rock mass. Ninety percent rock was excavated to construct underground metro stations. The fly rock was control by optimum stemming lengths and by using suitable fly control rubber mat.

According to press reports ,one of the last surviving historical vestiges of namma City that has provided millions of women and children medical relief and maternal care now finds itself under imminent threat.The nearly 200-year-old edifice has developed a crack in its foundation, raising safety concerns not only for those housed in it for receiving medical attention, but also for its very own survival.Today, it sadly stands a mute testimony to what skewed development does when authorities run roughshod over elementary issues of protection, preservation and caution. The relocation of the pediatric intensive care unit was done as The Metro in the north-south stretch is underground below the Vani Vilas Hospital and becomes elevated near BMC towards Vani Vilas Circle. Earlier due to blasting at the work site on the Vani Vilas Hospital premises, cracks in the ceiling of the 70-year-old hospital building were noticed. "The children's block in Vani Vilas Hospital, Radiology Department with the cancer patients ward, the Virology Department and the Sirur Block are affected by the blasting. More than 100 beds each in the children's block and the cancer patients' ward were relocated."These are stone buildings without pillars and are more than 75 years old. Due to the decrease in the water table below Vani Vilas Hospital, the ceiling has been impacted,” is reported in the media.