摘要
应用同性点源之间的相斥和聚焦原理,设计出适合坑道空间的垂直聚焦超前探测方案。利用有限元法结合高效行压缩存储格式及迭代求解算法,对三维坑道空间中聚焦超前探测效果进行模拟研究。数值计算结果与土槽物理模拟实验结果对比,说明设计方案达到l了聚焦超前探测的目地。通过坑道复杂模型计算,表明垂直聚焦观测方案能够有效探测前方和旁侧存在的不良地质体。
The tunnel DC resistivity advanced detection method is a method based on the theory of equipotential spherical surface that is excited by point source in full space.Due to the existence of a considerable impact from tunnel and detection environment when the measurement is performed at the rear of the heading face,difficulty in data interpretation is largely increased.On the basis of vertical ground resistivity sounding and side DC logging technology,the authors proposed a vertical focused advanced detection project which is suitable for tunnel space.The finite element numerical simulation method（FEM） was used to simulate the effect of focused advanced detection method in three-dimensional tunnel space.Compressed storage technology and preconditioned iterative algorithm could greatly improve the efficiency of forward modeling as well.A comparison between the FEM modeling results and the physical simulation results in a soil bin shows that the accuracy of forward simulation can meet the requirement,and the vertical focused device can attain the purpose of focused advanced detection.The results of simulated complex models under the condition of vertical focused observation show that the scheme can effectively detect ill geological bodies in front and side tunnels.
出处
《物探与化探》
CAS
CSCD
北大核心
2011年第3期419-422,共4页
Geophysical and Geochemical Exploration
基金
国家自然科学基金项目(40774057)
广西科学基金项目(桂科自0832263)资助
关键词
坑道电阻率法
超前探测
有限元数值模拟
垂直聚焦
tunnel resistivity method
advanced detection
finite-element numerical modeling
vertical focus
