摘要
通过有限元法数值计算,对影响坑道直流聚焦法超前探测距离的主要因素及该方法的超前探测距离进行研究。模拟含水层体积变化、测量电极距变化、异常电阻率比值、坑道旁侧异常体的变化和掘进面后方坑道中的金属体对超前探测距离的影响。结果表明:掘进面到含水层的距离、测量极距变化和异常电阻率比值对聚焦法超前探测距离的影响不大,当坑道后方存在金属体时对超前探测距离没有影响;而坑道正前方目标体(含水层)的体积变化对聚焦法超前探测距离的确定影响较大,聚焦法超前探测的有效距离为10～11 m。
By finite element method, the focus of DC method detection distance influence factors and the valid detection distance were studied. The effects of the aquifer bed volume variation, the range of potential electrode, the ratio of anomalous resistivity and the metallic anomalies existing behind the tunnel face on the advanced detection distance were simulated. The results indicate that the distance between the tunnelling surface and aquifer bed, the range of potential electrode and the ratio of anomalous resistivity have a slight influence on the detection distance, meanwhile, the effect of the metallic anomalies existing behind the tunnel is not obvious. However, the detection distance can be affected greatly by the volume variation of the target （the aquifer bed） right ahead the tunnel, and effective detection range is 10-11 m.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2012年第3期970-975,共6页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(41174103)
国家"十二五"科技支撑计划项目(2011BAB04B08)
国家博士点基金资助项目(20110162130008)
湖南省研究生科研创新项目(CX2011B101)
关键词
坑道
聚焦电流法
有限元
超前探测距离
tunnel
DC focus method
finite element method
advanced detection distance
