工程勘察结合物探法在道路塌陷调查中的应用

Application of engineering survey combined with geophysical prospecting method in road collapse investigation

为查明南京江宁区某城市道路的坍塌原因,坍塌现场采取了工程地质勘察和工程物理勘探多种方法,进行了不同程度的调查工作。结果表明:工程勘察从水土NH+4离子分析,发现了该场地下污水管道存在渗漏情况,且静力触探发现该场地下1.9 m~6.6 m处存在松散和空洞区;弹性波CT地震勘探、VSP垂直地震剖面法和低频地质雷达三种方法,综合判定塌陷区下方2 m~10 m深度范围存在不同程度的松散区,其中3 m~6 m的松散程度相对严重。

In order to find out the cause of the collapse of a city road in Jiangning District,Nanjing,a variety of methods of engineering geological survey and engineering physical exploration were adopted to investigate the collapse site.The results show that:from the analysis of soil and water NH+4 ion,the leakage of underground sewage pipeline is found,and the loose and hollow area is found at 1.9 m~6.6 m underground of the site by static penetration test,three methods of elastic wave CT seismic exploration,VSP vertical seismic profile method and low-frequency geological radar comprehensively determine that there are different degrees of loose areas in the depth of 2 m~10 m below the collapse area the loose degree of 3 m~6 m is relatively serious.