摘要
裂缝是影响胶结充填体顶板稳定性的重要因素之一,确定裂缝深度是进行胶结充填体顶板稳定性分析的前提条件。为此,进行了探地雷达探测胶结充填体顶板裂缝的研究。首先测定了胶结充填体的相对介电常数,讨论了探地雷达探测胶结充填体裂缝的可行性;其次基于异常点的雷达电磁波散射和波的叠加原理,得出了垂直裂缝雷达波响应特征为裂缝顶、底端对应的双曲线波组,并在正演模拟得到了验证;最后对某铜矿胶结充填体顶板裂缝进行探测,探测结果为一簇双曲线波组。研究表明:探地雷达可用于探测胶结充填体裂缝。
The existence of cracks in cemented backfill roof is one of the main factors which influence the stability of roof. The determination of crack＇s depth provides a precondition for the roof stability analysis. So ground penetration radar （GPR） technique is proposed to detect and indentify the cracks in cemented backfill. Firstly,the relative dielectric constant of cemented backfill was measured and the feasibility of crack detection using GPR was discussed. Then, based on the principle of radar and electromagnetic wave scattering and wave superposition at anomalies,it is obtained that the response characteristics of the radar wave is a hyperbolic wave group from the top to the end of vertical cracks, which was verified by the forward modeling. Lastly, detection on the roof cracks of cemented backfill for a copper mine was made, and the findings displayed as a hyperbolic wave group. The studies indicated that ground penetrating radar can be used to detect cracks in cemented backfill.
出处
《金属矿山》
CAS
北大核心
2014年第4期17-21,共5页
Metal Mine
基金
江西省科技支撑项目(编号:20121122040027)
江西省高校科技落地计划项目(编号:KJLD12027)
江西省教育厅项目(编号:GJJ09250)
江西省研究生创新专项资金教育厅项目(编号:YC2012-S096)
西理工大学校级科研课题(编号:jx xj12120)
关键词
胶结充填体
探地雷达
裂缝
正演模拟
现场试验
Cemented backfill, Ground penetrating radar（ GPR）, Crack, Forward modeling, Field test
