As reported by Lao Dong Newspaper, at around 9am on August 7, on the road section through Mao Sao Chai village (connecting National Highway 4 with Sin Che commune), a sinkhole appeared with an area of about 16m, 6m deep, the volume of rock and soil collapsed to about 100m3.
Immediately after receiving the news, the People's Committee of Sin Che commune coordinated with the commune police to stretch warning ropes, put up traffic diversion signs, and at the same time organized a survey to develop a solution.
According to local authorities, the construction is facing many difficulties. Due to deep holes and complex geology, construction units have to do it manually, using layered stone cages to reinforce, and machinery only supports filling the outside.
To fill the hole, the authorities used 30 iron baskets containing nearly 60m3 of boulders (connected together) to drop to the bottom of the hole to create a foundation to prevent subsidence, then poured 20m3 of crushed stone to fill the gap, leveling to ensure the temporary roadbed was tight.
By the afternoon of August 10, the work of repairing the sinkhole had basically been completed to open the first traffic route, and motorbikes and cars could pass normally. Although the road has been cleared, we are continuing to monitor the stability of the sinkhole, said Mr. Vien Dinh Hiep, Chairman of the People's Committee of Sin Che commune.
It is known that due to the specific geological structure, Sin Che commune and the communes of the old Si Ma Cai district often have subsidence holes, especially during times of prolonged heavy rain. Therefore, vehicles and people passing through here need to pay attention to prevent sudden subsidence that causes traffic insecurity.
