排列方式及电极距对高密度电法探测孤石的影响分析

摘要

通过高密度电法在广州某地铁线路勘察孤石的探测试验，分析几种不同排列方式及电极距对孤石高密度电法探测效果的影响，同电极距时，偶极装置具较高精度，对浅部不均匀体反映也较灵敏。满足探测深度条件下，缩小电极距时，微分装置相比偶极和温纳装置其探测精度效果更明显。试验表明β和γ装置测量数据的T比值参数法具有较好的探测效果，在实际工作中值得进一步试验推广。%Through different arrangement and electrode distance using high density electrical method of Guangzhou sub-way line investigation has revealed the boulder detection test,analysis of arrangement and electrode distance on the high density resistivity method to detect the effect and influence of boulder.Dipole device with high precision is sensitive to re-flection of the shallow body with the electrode distance.Meeting the requirement of detecting depth,differential device is more obvious about improving the detection accuracy compared with dipole device and Winner device.The test results show that the T ratio parameter method of the measurement data of beta and gamma device has good detection effect,and is worthy of further testing in practice.