Vietnam Road Administration issued an Order to build an emergency project to overcome subsidence at Chuoi slope, Que Phong district (Nghe An).

Deputy Director of the Vietnam Road Administration Nguyen Manh Thang has just signed Decision No. 2976/QD-CDBVN promulgating the Order to build emergency works to overcome the consequences of natural disasters on the route from Km264+300÷Km264+900 of National Highway 16, Nghe An province, caused by heavy rains from July 12, 2024 to July 15, 2024 (Chuoi slope area, Chau Kim commune, Que Phong district).

The total estimated investment for repairs is 4.9 billion VND from the State budget (funding source for road economic activities) invested by Nghe An Department of Transport, expected to be implemented and completed before October 30, 2024.

Accordingly, the construction unit will clear mud, soil, and collapsed rocks from the slope that still overflows and covers the foundation, road surface, and longitudinal ditches; transport mud, soil, and rocks to the assembly location agreed upon by the local authorities according to regulations. The volume of mainly excavated soil is about 1,350m³.

At the same time, excavate and unload the unstable soil and rock on the positive slope, transport the soil and rock to the assembly location according to regulations; after excavating and unloading, construct steel cage revetment at the foot of the positive slope section Km264+300 to strengthen the stability of the slope, limit mud, soil, and rock from sliding onto the road surface and ensure underground drainage, improve traffic safety. The main volume is about: digging and lowering the slope of 18,824m³; arrange 240 stone cages of size (2x1x1)m.

Make a temporary road close to the left side of Km264+700 section with a flexible curve radius but ensure the largest allowable according to terrain conditions; base width 6m, road surface wider than 4m with pavement structure with a base of 144 rubble gabions of size (2x1x0.5)m, covering 560m²Cover the surface and sides of the gabion with geotextile fabric; the upper foundation is made of crushed stone aggregate or water crushed stone to ensure the asphalt pavement structure has a lifespan suitable for the time of ensuring traffic until the repair of the section is completed; reinforce the horizontal drainage culvert to ensure drainage of the terrain. The main volume of temporary pavement is made of crushed stone aggregate or water crushed stone, asphalted with an area of ​​280m².

Fully supplement the system of signs, install soft guardrails, markers, warning lights... at necessary locations on the route.

Vietnam Road Administration notes: During the implementation process, this is an area with very complex geology, groundwater, and a risk of continued landslides. Therefore, the investor needs to direct consultants to conduct geological and hydrological surveys and tests to select a suitable groundwater treatment plan and excavation and offloading range.

Before the Emergency Construction Order was issued, from July 12-15, 2024, at this location, the road was filled with gravel aggregate to connect the two ends of the road and the area of ​​the collapsed road surface to ensure temporary traffic; poured M100 cement mortar to fill the cracks on the asphalt road surface, reinforced the curb and longitudinal ditch. The main volume is about: filling with soil, gravel aggregate 175m³; pour cement mortar into the 1.5m crack³.

From July 16 to 20, 2024, during the process of monitoring the subsidence location on the roadbed, it was found that the subsidence continued to develop, making it unsafe to travel, so the Nghe An Department of Transport directed the excavation of soil and rock to expand towards the positive slope, leveling, combining with filling ditches, building temporary roads with soil, graded type II crushed stone to serve traffic. Dismantle the traffic safety system (corrugated iron guardrails, signs, ...) within the subsidence and damage area; ensure traffic for rudimentary vehicles and motorbikes for groups of 5 to 7 people to pass through in non-rainy weather conditions and during the day. The main volume is about: digging the roadbed of 520m³; 30m rock breaking³; re-filling and restoring 540m of roadbed³.

At the same time, install signs, barriers, warning lights... at both ends of the collapsed road and coordinate with local authorities in organizing guard duty to ensure traffic according to regulations.

Previously, on July 30, 2024, Deputy Minister of Transport Nguyen Duy Lam signed and issued Decision No. 952/QD-BGTVT declaring a natural disaster emergency to respond to and repair damage to road traffic infrastructure at the route from Km264+300 - Km264+900 of National Highway 16 caused by heavy rains in Nghe An province from July 12 to 15, 2024.

In particular, the Vietnam Road Administration and Nghe An Department of Transport are assigned to manage and implement the prescribed natural disaster recovery activities within their scope and responsibilities, including reviewing and determining the specific extent of damage to road works caused by natural disasters, repair and remedial solutions, and issuing an Order to build emergency works to overcome the consequences of natural disasters according to the provisions of law.