城市道路塌陷原因与防治

Cause and prevention of urban road to subside

路面塌陷是因路基土被水冲刷、淘蚀,土粒随水流失引起的.土产生流沙或淘蚀的主要原因有土的类别、密实程度、颗粒级配、透水性和动水等等.在动水力的作用下,级配不良、土质疏松的粉细沙或粉土容易发生流沙或淘蚀现象.防治措施的重点应放在城市排水管道的接口和下水井处.主动控制措施是在排水管道铺设和下水井砌筑时,做好排水管道接口和下水井的防渗漏工作,并做反滤层或丝网滤层,以防止细粒土随水流失;常用的被动处理措施为掀开路面,清除松散土,分层回填灰土或粗沙、中沙,并夯实.

Urban road in Yinchuan subsided sometimes. The cause of urban road t o subside had been analyzed, as well as the course of forming and developing. Th ese main causes were soil types, density, grade match, and flowing water. Silty sand, fine sand and silt easily eroded away. The emphasis of prevention and cure should be put on drainpipe and drain well. The initiative measure was to lay fi lter on it. The passive measure is to clean out soft soil, backfilling lime-soi l or coarse sand.