• 责任者：Qiu Zehua (Institute of Crustal Dynamics ; China Earthquake Administration ; Beijing 100085 ; China) ; Zhang Guohong
• 刊名：Seismology and Geology
• 出版年：2013
• 卷期：35(4)
• 关键词：高密度电阻率法 ; multi-electrode resistivity methods
• 页码：p.805-816
• 图表：8 illus., 3 tables, 25 refs.
• 分类号：1600
• issnNo：ISSN0253-4967
• isbnNo：CN11-2192/P

     Borehole strain monitoring is an important geodetic means with a wide range of use in geodynamics research.One of the main reasons for the slow development of this kind of observation is that the establishment of a borehole strain monitoring site is costly and the success rate is not very high.Some sites fail due to the unfavorable borehole conditions,that is,rocks at the depth where the sensor is embedded are not intact but fractured.Sometimes even if the rocks were found not as good as required,the instrument had to be installed because of the expansive cost in drilling the hole.To solve the problem,it is necessary to prospect the rock condition of the site before drilling.Fractured rocks usually contain ground water in the fractures,which lower the rocks＇ resistivity.Resistivity imaging survey can be applied to the investigation of underground condition and give local distribution of resistivity with relatively high resolution.Three experiments have been carried out in Shanxi Province,in which single profiling is done at Shanghuangzhuang,cross profilings at Dongmafang and at Jiaokou,respectively.Three boreholes at Shanghuangzhuang and one at Dongmafang and at Jiaokou each were drilled for comparison of different types of instruments.Results of rocks strength experiments and instrument installations for the five boreholes agree well with results of the surveys.It suggests that resistivity imaging survey is an effective method to predict the underground condition of rocks.Instrument installation should avoid low-resistivity zones indicated by the profiling to prevent putting the sensor into fractured rocks.