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工程勘察中,岩溶以及地层脱空给工程安全带来严重安全隐患,应用钻探手段查明此类地质问题代价较大,此时应用经济有效的地球物理技术探测地下地质异常体,可以在节约成本的同时达到解决地质问题的目的。本文首先通过2-D瞬变电磁正演模拟,分析正演模拟结果,然后结合地质钻探结果,分析瞬变电磁法在探测岩溶及地层脱空等地质问题的应用效果。结果表明,瞬变电磁法可以有效地探测岩溶及地层脱空等地质问题,适合作为工程勘察辅助手段加以应用。
In engineering investigation, karst and formation voidage bring serious safety hazard to engineering safety. It is more costly to apply drilling methods to identify such geological problems. In this case, the geophysical technique of cost-effective geophysical exploration of underground geological anomalies can save cost At the same time to achieve the purpose of solving geological problems. In this paper, the forward simulation results are analyzed by 2-D transient electromagnetic forward modeling. Then, combined with the geological drilling results, the application effects of transient electromagnetic method in geological problems such as karstification and formation voidage are analyzed. The results show that the transient electromagnetic method can effectively detect the geological problems such as karst and formation emptying, and is suitable for application as an aid to engineering investigation.