Underground Metro Rail vibrations rattle Green Park residents in Delhi

New Delhi: Several residents of the South Delhi’s Green Park area living in vicinity of Gurgaon-Delhi yellow Metro line have written to the Union urban development ministry as well as Delhi Metro chief Mangu Singh, expressing concern about increased ground vibrations due to passage of trains which are affecting the foundations of the nearby buildings as well as disturbing the people living in the area.

“The increased low frequencies of vibrations due to underground Metro passing through Green Park in the last couple of years is a cause of concern for the residents of A-Block, Green Park, as these vibrations have a deep negative impact on man-made structures, foundations of buildings, sensitive equipment as well as causing human annoyance. This underground track was commissioned five years ago, but it did not create so much of a problem at the time,” said K.K. Kapila, an affected resident of A-Block, Green Park, who is also a well-known road safety expert and heads an engineering consultancy organisation.

“The use of underground Metro trains as fast and safe appropriate alternative for passengers is well-known worldwide. However, passage of trains with appropriate speed and train wheels rolling on rail create vibrations that are transmitted through the track support system into nearby structures. This could cause fatigue in the materials of ground and structure, cracks in walls and other related difficulties. The vibrations need to be controlled urgently lest they continue to damage the abutting structures with slow vibrations and making them weaker every day against possible calamity like earthquake” Vandana Lakhanpal, another resident of the area, said.

“Worldwide various technical solutions are suggested and used for controlling the vibrations — these include installing mass spring system (track bed isolation) technology, reducing of sleeper spacing use of soft pads/mats under sleepers, use of friction enhancing rail fasteners and softening of suspension systems of the trains. This should be mandated for all the ongoing and future underground Metro works,” added Mr Kapila.