HA NOI — Torrential rain from tropical storm Kai Tak had led to the collapse of part of the road in Ha Noi's Le Van Luong Street on Saturday leaving a 5m-deep hole measuring 20m by 30m, municipal Transport Department said.
The hole had closed the road to traffic from the city centre to Ha Dong District over the past few days.
At the department meeting on Tuesday, representatives said rain had preceded the collapse, which broke underground water pipes and sewerage, but the cause was yet to be investigated.
Department Deputy Director Nguyen Hoang Linh said road investor Nam Cuong Group, and building investor Song Da Thang Long Joint Stock Company, which was working on a project next to the hole, were seeking independent consultants to identify the cause of the collapse.
Meanwhile, the road investor had been ordered to stop water flowing into the hole and ensure drainage for surrounding areas and open an alternative route for traffic.
Song Da Thang Long had been told to consolidate foundations to prevent further sinking and to restore the water supply system. It was also ordered to build up part of the hole by Saturday to allow traffic to pass.
The Transport Engineering Design Corporation had been asked to propose ways to fix the hole, although experts were concerned that continued rain would hamper reconstruction work.
Previously, the depression was alleged to have been a result of poor quality construction work on the nearby site by Song Da Thang Long.
Meanwhile, Associate Professor Nguyen Dinh Hoe, of the Viet Nam Association for Conservation of Nature and Environment, said that the 3,000-cubic-metre-hole that took form between last Sunday morning and Monday afternoon might be the result of geological faults sliding without causing an earthquake.
This was evidenced by the disappearance of road-building materials including soil and sand with an average speed of 100 cu.m per hour, he said, adding that the material must have sunk downward.
Hoe also mentioned the collapse of a dyke and other underground construction in the southwest of Ha Noi as it is located inside the fault zone of the Hong (Red) River and Chay River.
"It's easy to identify the presence of geological fault around the hole," he said, warning about the consequences of active faults on the area in the future. — VNS