Addressing landslides at Nam Dan 2 Sluice Gate
At 6:30 PM on April 4, 2011, a landslide unexpectedly occurred at the construction site of the Nam Dan Canal and Lock System Upgrade and Expansion Project (Xuan Hoa commune, Nam Dan district). The landslide, with a significant slope, blocked the Lam River riverside tourist route. Fortunately, no vehicles were passing through the area when the incident occurred, and it coincided with a construction break, so there were no casualties.
At 6:30 PM on April 4, 2011, a landslide unexpectedly occurred at the construction site of the Nam Dan Canal and Lock System Upgrade and Expansion Project (Xuan Hoa commune, Nam Dan district). The landslide, with a significant slope, blocked the Lam River riverside tourist route. Fortunately, no vehicles were passing through the area when the incident occurred, and it coincided with a construction break, so there were no casualties.
The Nam Dan sluice gate and canal system upgrade and expansion project is a large-scale irrigation project in Nghe An province, aiming to alleviate drought conditions in key rice-growing areas of Nam Dan, Hung Nguyen, Nghi Loc districts and Vinh City. Mr. Cao Danh Phu, Deputy Director of Nam Irrigation Company Limited, stated: "The Nam Dan II sluice gate irrigation project is invested by the Nghe An Department of Agriculture and Rural Development with a total investment of 500 billion VND. Nam Irrigation Company Limited is the project management unit, the design unit is the Technology Transfer Consulting Company of the University of Water Resources, and the winning bidder is Hoa Hiep Company Limited (general contractor) in a joint venture with Hai Phong Irrigation Construction Company and Nghe An Irrigation Construction Company I. The cause of the incident was due to weak soil, high traffic volume and heavy loads, and prolonged rainfall for months, causing the foundation slope soil to become wet..." Mr. Tran Dinh Nga, a consulting supervisor from Thang Long Consulting and Construction Joint Stock Company, added: The landslide area is 73 meters long, with an average width of 14 meters and a height of 3 meters. The total volume of soil and rock that slid down reached approximately 3,100 cubic meters.3.
Workers are adjusting the Larsen sheet piles and backfilling them with hill soil.
On the morning of April 6, 2011, at the Nam Nghe An Irrigation Company Limited, the responsible agencies held a meeting to discuss how to handle the serious incident. The immediate remedial measures included prohibiting traffic from passing through the construction area; rebuilding the temporary embankment with a slope coefficient greater than the old foundation pit slope using hill soil, with embankment bases at elevations (+6.00) and (+300); excavating horizontal earth columns at the existing foundation pit elevation; adjusting the Larsen sheet piles; and backfilling with hill soil and compacting thoroughly.
Ngoc Anh
