瞬变电磁法在煤矿采空区注浆效果检测方面的应用

通过对某煤矿采空区进行瞬变电磁法勘探及注浆效果评价实例分析,证实瞬变电磁法不仅能准确圈定采空区的分布范围,而且能有效检测采空区注浆后的工程质量。利用瞬变电磁法进行采空区注浆前后的检测评价,须采用相同的勘探网度及测点布设,相同的数据采集参数及处理方法、处理流程及处理参数等。实例表明采空区的电阻率异常值及分布范围在注浆前后有明显的差别,表现为电阻率等值线的起伏形态、梯度、展布方向等特征存在着较大差异。

Application of Transient Electromagnetic Method in Coalmine Gob Area Grouting Effect Detection

Through transient electromagnetic method prospecting and grouting effect evaluation living example analysis in a coalmine gob area,authenticated the transient electromagnetic method can not only delineate gob area limits correctly,but also can detect gob area grouting engineering quality.To carry out gob area before and after grouting detection and evaluation through the method,should lay out identical density of prospecting grid and observation points,identical data acquisition parameters and processing method,processing flow and parameters.Examples have demonstrated that the resistivity anomalous values and distribution extension in gob area have obvious differences before and after grouting,and appear as major differences in resistivity isopleths undulating configuration,gradient,extending direction and the like characteristics.