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道路塌陷已成为天津市最主要的城市灾害,使社会经济遭受了严重损失,对其成因的研究及制定预防措施具有重要的理论意义及工程实用价值。以地质雷达管线探测、管内探测为主要手段,结合钻孔及水文地质资料,查明了道路塌陷异常区的分布、地下地层差异压实及管线破损情况,并得出了地质和水文地质条件是决定路面塌陷发生的内在因素,而路面的荷载及潜水面与污水管的水势是路面塌陷的直接原因。以此总结形成了“软塑土的差异压实+侧向位移—管线破损—动水—土体掏空—道路塌陷”的成因机制。最后提出了塌陷前按一定的砂、泥配比合理充填,及塌陷后管线间加内衬的防治对策。
The road collapse has become the most important urban disaster in Tianjin, which has caused serious losses to the society and economy. It is of great theoretical significance and engineering practical value to study its causes and make preventive measures. Based on the detection of geologic radar pipeline and detection in pipe, the distribution of anomalous subsidence area, the compaction of underground stratum and the pipeline damage were identified by combining borehole and hydrogeological data. It is concluded that the geological and hydrogeological conditions are Determine the internal factors of pavement collapse, and the pavement load and submersible surface and sewage pipe water potential is the direct cause of pavement collapse. In this way, the forming mechanism of differential compaction, lateral displacement, pipeline breakage, moving water, soil hollowing out and collapse of the road is formed. Finally, it puts forward some countermeasures for prevention and control of sand filling according to certain ratio of sand and mud before collapse and lining between collapsed pipes.