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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。
The fluctuation of bedrock surface along the pipe jacking is an important basis for the design and construction of the pipe jacking project in the shallow area of bedrock. The integrated geophysical prospecting method combined with a small amount of drilling with high efficient, economical and linear survey features can detect the undulation of bedrock along the pipe jacking so as to realize the organic unification of high-efficiency survey and the reliability of results. Taking a drainage mains project in Yulin, Guangxi as an example, the top surface of the limestone along the pipe jacking is continuously surveyed by the comprehensive geophysical prospecting method of Rayleigh surface wave and geological radar. The results of the exploration are in good agreement with those of the later drilling. Practice shows that in the shallow bedrock area, the comprehensive geophysical prospecting method can effectively obtain the undulation of the bedrock surface, and provide the key basis for the design and construction of the jacking pipe project.