DRY-1B型电容分量式钻孔应变仪关键技术与应用  

Key technology and application of DRY-1B capacitive component borehole strain gauge

作　　者：彭华[1,2,3] 马秀敏 孙尧[1,2,3] 姜景捷 郝飞[1,5] PENG Hua;MA Xiumin;SUN Yao;JIANG Jingjie;HAO Fei(Institute of Geomechanics,China Academy of Geological Sciences,Beijing 100081,China;Observation and Research Station of Crustal Stress and Strain in Beijing,Ministry of Natural Resources,Beijing 100081,China;Key Laboratory of Active Tectonics and Geological Safety,Ministry of Natural Resources,Beijing 100081,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;Institute of Geological Survey,China University of Geosciences,Wuhan 430074,Hubei,China)

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]自然资源部北京地壳应力应变野外科学观测研究站,北京100081 [3]自然资源部活动构造与地质安全重点实验室,北京100081 [4]北京科技大学土木与资源工程学院,北京100083 [5]中国地质大学(武汉)地质调查研究院,湖北武汉430074

出　　处：《地质力学学报》2023年第3期313-323,共11页Journal of Geomechanics

基　　金：中国地质调查局项目(DD20230249,DD20230014);中国地质科学院地质力学研究所基本科研业务费(DZLXJK202106)。

摘　　要：文章简述了DRY-1B型电容分量式钻孔应变仪(简称“钻孔应变仪”)的理论基础,攻关了微位移感知、降噪、控温、性能测试、标定等关键技术,并通过了性能测试,标定结果表明:该应变仪达到了高分辨率(≥5×10^(-11)ε)、宽频带(10~100 Hz可选)、大动态范围(≥1×10^(-3)ε)、24位AD记录、低功耗(<3 W)等技术指标,其性能优于同期美国PBO和日本同类钻孔应变仪,是一款国际领先的地壳运动长期观测仪器,基本能够满足地壳长期应变缓慢积累的蠕变运动和短期应变快速变化的地震火山活动等观测需求。2008年以来,通过20余个地应力台站的应用,该钻孔应变仪记录到大量的地壳形变、断裂活动、同震应变波、应变阶跃、矿压活动等应变信息,并以北长山地应力台站应变监测数据自洽性检验和土耳其地震映震能力分析为例发现:北长山地应力台站电容传感器1#+3#和2#+4#元件应变曲线总体平稳,相关系数R2达到0.95;1#-3#和2#-4#元件的差应变年变化速率为10-8量级,反映出长岛地区以剪切应力为主,且处于地震活动相对高的应力环境;利用该应变仪观测到2023年2月6日土耳其M 7.8级和M7.5级两次地震明显的同震应变响应,尤其是获取了M7.8级主震面波周期为50~60 s,呈现出面波异常,理论上可分辨出100 km范围M0.74级地震产生的应变波,达到了应用示范效果。该钻孔应变仪在地球动力学研究、内动力地质灾害监测等领域具有较好的推广价值和应用前景。This paper briefly describes the theoretical basis of the DRY-1B capacitive component drilling strain gauge(drilling strain gauge).It discusses critical technologies such as micro-displacement sensing,noise reduction,temperature control,performance testing,and calibration.The strain gauge achieved high resolution(≥5×10^(-11)ε),wideband(10–100 Hz optional),extensive dynamic range(≥1×10^(-3)ε),24-bit AD recording,low power consumption(<3W),and other technical indicators.Its performance is better than the United States PBO and Japan borehole strain gauge of the same period,and it is an international leading long-term observation instrument for crustal movement,which can basically meet the observation requirements of creep movement with slow accumulation of long-term strain and seismic and volcanic activity with a rapid change of short-term strain.Since 2008,through the application of more than 20 geostress stations,the borehole strain gauge has recorded a large amount of strain information,such as crustal deformation,fault activity,co-seismic strain wave,strain step,and ore pressure activity.Based on the results of the self-consistency test of strain monitoring data of the geostress station in the Beichangshan Mountain and the analysis of seismic mapping capacity of the Turkey earthquake,it is found that the strain curves of the 1#+3#and 2#+4#capacitance sensors at the Beichangshan Mountain stress station are generally stable,and the correlation coefficient R2 is 0.95.The annual variation rate of the differential strain of 1#–3#and 2#–4#elements is 10-8 magnitude,which reflects that the shear stress is dominant in the Long Island area and the stress environment of seismic activity is relatively high.The strain gauge was used to observe the apparent co-seismic strain response of Turkey’s M 7.8 and M 7.5 earthquakes on February 6,2023.In particular,it obtained the M 7.8 main seismic surface wave period of 50–60 s,presenting an out-facing wave anomaly.Theoretically,the strain wave generated by the M 0

关 键 词：电容分量式 钻孔应变仪 差动电容位移传感器 同震应变响应 内动力地质灾害监测 

分 类 号：P315.727[天文地球—地震学]