摘要
采用探地雷达探测下向分层充填法中胶结充填人工假顶中裂缝的状态。首先从理论上分析了裂缝的雷达响应特征;其次测定了下向分层胶结尾砂充填体材料的相对介电常数为10.9;最后研究了下向分层胶结尾砂充填体材料中垂直裂缝与倾斜裂缝的正演结果。研究结果表明:理论上得出垂直裂缝的雷达响应特征为对应裂缝顶、底端的绕射双曲线,倾斜裂缝是沿着裂缝倾斜方向的一系列绕射双曲线;正演结果说明下向分层胶结尾砂充填体中的裂缝是可测的,且裂缝的雷达响应特征符合理论分析规律。研究结果可为下向分层胶结尾砂充填体中裂缝探测提供理论认知和数据判读支持。
The Ground Penetrating Radar(GPR)was applied to detect the cracks in the artificial roof under downward cemented cut-and-fill mining.Firstly,radar response characteristics of cracks were analyzed theoretically.Then,the relative dielectric constant of the materials in filling body was measured and the result was 10.9.Lastly,forward results of vertical cracks and inclined cracks were studied.The study results showed that the radar response characteristic was diffraction hyperbola corresponding to the top and bottom of vertical crack,and the characteristic of inclined cracks was a series of diffraction hyperbola along the tilt direction.The forward results showed that the roof cracks in cemented tailings filling body can be detected,and the radar response characteristic of cracks was accord with the theoretical analysis.The research can provide a theoretical basis and data interpretation for the detection of cracks in filling body.
出处
《矿业研究与开发》
CAS
北大核心
2015年第1期51-55,共5页
Mining Research and Development
基金
江西省自然科学基金(20132BAB216019)
江西省高等学校科技落地计划项目(KJLD12027)
江西省研究生创新专项资金资助项目(YC2012-S096)
关键词
探地雷达
裂缝
胶结尾砂充填体
相对介电常数
正演模拟
Ground Penetrating Radar,Crack,Cemented tailings backfill,Relative dielectric constant,Forward simulation
