探地雷达在顶管施工检测中的应用  

Application of GPR to Detection of Jacking Pipe Construction

作　　者：王德咏[1] 罗先启[1] 李宏阶[1] 

机构地区：[1]三峡大学三峡库区教育部重点实验室,湖北宜昌443002

出　　处：《勘察科学技术》2009年第2期62-64,共3页Site Investigation Science and Technology

基　　金：湖北省自然科学基金资助项目(2005ABA295);湖北省教育厅重大科学研究计划资助项目(Z200513003);三峡大学科学基金资助项目(2004C03)

摘　　要：在堤坝下方进行顶管施工会导致上部土层扰动,有可能引起堤坝沉陷。采用探地雷达法对顶管施工过程中顶管上部堤坝和顶管内壁均进行了无损检测。探测结果表明,地表以下5-10m的深度范围内存在不均匀结构;管道和原地层之间密实性不好,有一定的间隙存在。结合地质情况来分析,下陷原因主要是在施工过程中开挖面附近形成局部地下水位下降,力的平衡被暂时破坏而引起,与顶管施工关系不大。该工程的检测和分析方法可为类似工程提供借鉴。The disturbance of upper soil is caused by jacking pipe construction below the dam, and the settlement of dam may be occurred. Non-destructive test of GPR is carried out at the upper of dam and the inner wall of jacking pipe in the construction of jacking pipe. Detection results show that the heterogeneous structure exists in the scope of the surface to the depth of 5 - 10m, bad compactness exists between the pipeline and upper soil and there are some gaps. Combined with the geological conditions, the subsidence is mainly caused by local groundwater decreasing near the excavation face and the destruction of balance of forces, it has little relation with the construction. A practical reference is provided for similar engineering.

关 键 词：探地雷达 顶管施工 无损检测 

分 类 号：P631.83[天文地球—地质矿产勘探]