城区隐含塌陷及废弃空间探测治理技术探讨

Discussion on the Survey and Control Technology of Hiding Collapsed Pit and Unused Spaces in Downtown Area

针对各城市最近出现的地表塌陷事故,分析了事故原因,提出通过物探技术,全方面勘查市区地表范围内岩土稳定情况,探测出地表岩土内存在的隐含塌陷坑、未知坑洞等对路基安全存在威胁的隐患体,并提出采用地表无破坏注浆充填技术,对探测出可治理的隐含塌陷坑、废弃空间进行注浆充填,重新建造出完整城市地表,保证市区居民的安全。本文针对某市区受废弃人防工程造成的塌陷事故,采用瑞利波探测出了废弃空间大致分布范围,估算出预充填量,利用注浆技术进行废弃空间充填,治理废弃人防工程。

In order to solve the problem of frequent urban ground subsidence,this paper analyzes the causes of urban ground subsidence. Mainly includes:subway tunnel construction,underground pipeline leakage,civil air defense engineering collapse,artificial excavation backfill false,influence of geological structure and other seven kinds of reasons. For these reasons,the authors using theoretical analysis and design put forward the method of ground subsidence control. First the authors proposed the comprehensive geophysical prospecting method,including the rayleigh wave detection,high density resistivity detection,geological radar detection to detect the hiding collapsed pit and waste space in downtown ground. After that,using grouting technology without surface damage to fill the hiding collapsed pit,hiding collapsed waste space for rebuilding a complete city surface and ensuring the safety of urban residents. For a subisidence accident by waste civil air defense project in a city,by using the rayleigh wave exploration to detect roughly the range of waste space,the filling quantity is estimated,and then to treat the waste civil air defense project by filling the space with grouting technology.