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长电极直流电法滑坡监测有限元数值模拟 预览

FEM numerical simulation of long electrode DC geophysical method for landslide monitoring
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摘要 为探讨长电极直流电法监测滑坡灾害演变的可行性,采用非结构多重网格有限元方法模拟滑坡灾害孕育过程中长电极源和点电源两种模式的电位变化分布特征,在激发相同电压和电流的条件下,长电极源能够将更多电流传至滑坡薄弱面及其深部地层,具有较大的电势和显著的异常特征。此外,随着滑坡带薄弱面电阻率降低,长电极源使沿地表和垂直测线的电位势能增加,而点电源使沿地表和垂直测线的电位势能减小,点电源在地面观测条件下对滑坡低阻深度信息有较明显的异常反映,长电极源在垂直测线观测条件下对滑坡低阻深度信息有较明显的异常反映,有利于推断低阻薄弱带的空间位置。综合长电极源和点电源两种观测方法,能够对滑坡孕育过程及薄弱面位置进行有效监测。 In order to determine the teasibility of monitoring evolution of landslide disaster through long elec- trode DC survey, the resistivity variations of landslide weak contact zone monitored by long electrode and dot e- lectrode power source were analyzed by using unstructured multi-grid FEM. Under a certain electric voltage and current conditions excited, the long electrode source could transmit more electricity to the weak contact zone and the deep stratum of the landslide. With the decrease of resistivity of landside weak zone, the potential strength of both along ground and vertical survey lines of landside increased under long electrode source. In contrast, the potential strength of the same lines decreased under dot electrode source. Under conditions of dot electrode source, there were significant abnormal potential on the depth information of the landslide weak zone along with ground survey line. However, under conditions of long mal potential on the depth information with along vertical survey bined with the dot power electrode could effectively monitor the landslide disaster. electrode source line. Theretore, gestation proce , there were significant abnor- the long power eletrode com- ss and weak zone position of landslide disaster.
作者 李晓斌 杨振威 云美厚 刘彦 LI Xiaobin1,2, YANG Zhenwei1,YUN Meihou1,2, LIU Yan3( 1. School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, Henan, China ;2. Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region ,Henan Province ,Jiaozuo 454000 ,Henan , China ;3. China Deep Exploration Center- Si- no Probe Center, Chinese Academy of Geological Sciences, Beijing 100037, China)
出处 《河南理工大学学报:自然科学版》 CAS 北大核心 2019年第1期61-67,共7页 JOURNAL OF HENAN POLYTECHNIC UNIVERSITY
基金 国家自然科学基金资助项目(41772375) 河南省教育厅基础研究计划项目(14A440009) 河南理工大学博士基金资助项目(B2009-85)
关键词 滑坡监测 长电极源 点电源 直流电法 有限元 数值模拟 landslide monitoring long electrode source dot electrode source DC method FEM numerical simulation
作者简介 李晓试(1975-),山西运城人,博士,副研究员,主要从事地球科学数据与智能技术方面的教学和研究工作。E-mail:alxb98@126.com
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