综合地球物理方法在浅地表高阻采空区探测中的应用

Application of Comprehensive Geophysical Methods in the Exploration of High Resistivity Minedout Areas on Shallow Surface

摘要:

某建筑用地位于原瓦庄煤矿矿界范围内，场地及周边曾进行过多期次的煤矿资源开采活动，形成诸多煤矿采空区，且有一封闭的瓦庄煤矿斜井待探查。通过现场踏勘、资料收集、分析及研究，采用高密度电阻率法和地质雷达综合地球物理方法对采空区进行勘察，重点探测废弃巷道的位置、埋深及走向等信息。根据探测目的要求，设计高密度测线2条、雷达测线6条，分别采用频率为100MHz和40MHz雷达天线进行现场探测，获取了地下0~30.0m深度范围的地质信息，查明了废弃巷道的分布范围、埋深及走向，后经钻探验证，采空区特征参数准确。本次探测成果为未来进行浅地表非积水高阻采空区的探查提供了基本思路与技术方法，同时也为后续场地稳定性及建筑适宜性评价提供了基础资料。

Abstract:

A construction site is located in the boundary of original Wazhuang coal mine. Many underground coal mining activities have been carried out in the site and its surrounding areas. Many minedout coal mines have been formed, and a closed inclined shaft of Wazhuang coal mine should be explored. Through onsite reconnaissance, data collection, analysis and research, by using highdensity resistivity method and geological radar integrated geophysical method, the minedout areas have been explored, and the location and depth of abandoned roadway have been detected as well. According to the requirements of the detection purpose, two highdensity lines and six radar lines have been designed. The field data have been collected by using 100MHz and 40MHz radar antennas respectively. The geological information in the depth range of 030.0m has been obtained, and the distribution range, burial depth and direction of the abandoned roadway have been clarified. After drilling verification, the characteristic parameters of mined-out areas are accurate. The detection results will provide a basic idea for the exploration of shallow nonwater goaf in the future, and also provide basic data for the subsequent site stability and building suitability evaluation.