城市道路路基下面,一般都会铺设地下市政管线,如排水管道,排污管道,自来水管道等。这些管线长期在地下使用,会受到腐蚀和损坏,城市许多道路下面的土壤因此会出现溶解陷穴和坍塌。泥沙会同污水或雨水一起进入被损坏的管线,结 Under the urban road embankment, underground municipal pipelines are usually laid, such as drainage pipes, sewage pipes and water pipes. Long-term use of these lines underground, will be corroded and damaged, so many roads in the city so the soil will dissolve and collapse. Sediment enters the damaged pipeline together with sewage or rainwater and knots