高密度电阻率法在基岩勘察中的应用

从三电位电极系基本理论出发,对高密度电阻率法常用温纳、偶极及微分装置的分辨率、信号强度等进行了比较研究。实例分析表明,温纳装置测量获得的数据纵向分辨率较高,采集信号的强度大,信噪比高,采用该装置探测基岩面的起伏状况效果明显;偶极装置采集的数据横向分辨率较高,在探测基岩内部构造方面有较好的灵敏度,但该装置采集的信号强度小,抗干扰能力差。在实际应用时,建议运用多种装置形式进行综合测量和对比解释,以进一步提高勘探效果和精度。

Technology of high density resistivity method for bedrock investigation

Based on the fundamental theory of tripotential sonde,the paper explained the principle,working method,the process of data processing of high density measurement method of electrical resistivity,and applied it to actual engineering.Through examples of analysis,Wenner array has obvious effect for detecting the up and down situation of bedrock surface due to its high vertical resolution.In addition,Wenner array has advantage of strong signal acquisition and high signal-to-noise ratio.Instead,dipole array has high sensitivity for detecting the internal structure of the bedrock due to its high transverse resolution.While dipole devise also has weak capability on signal acquisition and low ability of anti-jamming.To sum up,the paper concluded that it should get an ideal detecting results by combination.The actual application indicated that this method can get good result of detecting bedrock.It is proved by practice that the application of high density resistivity method in bedrock investigation can get great result.Furthermore;it would do great help to improve the exploration results and accuracy by combining different arrays for comprehensive measurement.