高密度激电法在铁路不良地质勘察中的应用

Application of High Density Induced Polarization Method in Railway Exploration Under Unfavorable Geology

激发极化法是一种传统的物探方法,多用于矿产资源勘探。采用高密度激电法工作模式的单极-偶极装置和偶极-偶极装置进行滑坡、断层及采空区巷道的勘察,取得良好效果,电阻率和极化率参数均能较好反应滑坡界面和断层位置,在高人文噪声区的采空区勘察中,虽然极化率参数受到严重干扰,但由于本方法具有发射功率大的特点,电阻率参数依然能够较好反应采空区位置及分布。实践证明本方法具有成果参数多、勘探精度高、抗干扰能力强的特点,可用于铁路不良地质物探勘察,相较于其他传统工程物探方法在解决中浅层地质问题时有一定优势。

The induced polarization method is a traditional geophysical prospecting method,which is usually used in mineral exploration. In this paper,the operation mode of pole-dipole array and dipole-dipole array with high density induced polarization method is applied to the investigation of the railway landslide,fault and goaf. These surveys have achieved good results. Both the resistivity and the polarization parameters have obvious changes in the position of the sliding surface and the fault. During the process of goaf exploration,although the polarization parameters need to face serious humanistic electromagnetic interference,but due to the high power transmitter,the resistivity parameters can still respond better goaf location and distribution. Practice has proved that this method has the features of many parameters in results,high exploration accuracy and strong anti-interference ability,and it can be used for railway geophysical prospecting under unfavorable geology. Compared with other traditional geophysical prospecting methods,it has great advantages in the exploration of medium and small depth field.