综合物探方法在浅基岩地区顶管工程勘察中的应用

顶管沿线的基岩面起伏情况是基岩浅埋地区顶管工程设计、施工的重要依据。采用具有高效、经济、线状勘察特点的综合物探方法与少量钻探相结合的综合勘察手段,对顶管沿线的基岩起伏情况进行探测,可以实现高效勘察与成果可靠性的有机统一。以广西玉林市某排污干管工程为例,采用瑞雷面波结合地质雷达的综合物探方法对顶管沿线的石灰岩顶面进行连续探测,探测成果与后期钻探验证结果非常一致。实践表明,在浅基岩地区,利用综合物探方法可有效地获取基岩面的起伏情况,为顶管工程设计和施工提供关键依据。

Application of Integrated Geophysical Methods to Top-tube Engineering Survey in Shallow Bedrock Areas

In shallow bedrock areas,the undulation of bedrock surface along the top tube is the key basis for design and construction of top-tube engineering.Combined with a small amount of drilling,the integrated geophysical methods can accurately and efficiently detect the depth of bedrock surface.Taking a top-tube engineering in Yulin as an example,this paper applies Rayleigh wave method and ground penetrating radar（GPR） to detecting the depth of limestone surface along the top-tube,and the exploration results are consistent with subsequent drilling results.This practice has shown that,in shallow bedrock areas,the integrated geophysical methods can effectively obtain the undulation of bedrock surface,so as to provide a key basis for design and construction of top-tube engineering.