基于光纤光栅钻孔位移观测的东寨港沉降研究  

SUBSIDENCE DYNAMICS IN DONGZHAI PORT REVEALED BY FIBER BRAGG GRATING BOREHOLE DISPLACEMENT MONITORING

作　　者：刘冠中 刘爱春 范良龙 包莹 唐学武 LIU Guan-zhong;LIU Ai-chun;FAN Liang-long;Bao Ying;Tang Xue-wu(National Institute of Natural Hazards,Ministry of Emergency Management,Beijing 100085,China;Chifeng Earthquake Monitoring Center Station,Chifeng 024000,Inner Mongolia,China;Hunan Earthquake Agency,Changsha 410004,Hunan,China)

机构地区：[1]应急管理部国家自然灾害防治研究院,北京100085 [2]赤峰地震监测中心站,内蒙古赤峰024000 [3]湖南省地震局,湖南长沙410004

出　　处：《内陆地震》2025年第1期11-19,共9页Inland Earthquake

基　　金：国家电网公司总部科技项目(5200-202455115A-1-1-ZN);国家自然科学基金项目(41374182);北京市自然科学基金重点项目(3151003);中国地质调查项目二级项目(DD20190306).

摘　　要：东寨港作为1605年琼州M71/2历史地震的影响区,其沉降变形对陆陷成海研究、海口地区的建设规划具有重要意义。基于光纤光栅钻位移观测技术,利用东寨港7个钻孔近2年的井下垂向位移观测数据,获取该地区现今的沉降速率,并探讨东寨港沉降的影响因素。结果显示:(1)东寨港地区7个钻孔的位移速率介于-8.40 mm/a至18.78 mm/a之间,平均沉降速率-3.10 mm/a,平均抬升速率4.42 mm/a。(2)研究区沉降变形呈现显著的垂向分层特征,主要变形集中在浅地表下部,这可能是导致东寨港地区地表形变不显著的重要机制。(3)沉降速率与地层承载能力呈正相关关系,表明当前东寨港地区变形主要受构造活动驱动,而砂土液化、软土流滑等地质过程可能对现今沉降影响有限。(4)构造格局显示差异性运动特征:东寨港地堑内部呈现沉降趋势,而地堑东西两侧地垒则表现为抬升,这一空间分布模式与铺前-清澜断裂的构造控制作用高度吻合。As an affected area of the 1605 Qiongzhou M 71/2 earthquake,Dongzhai Port's subsidence deformation holds significant importance for studying land subsidence processes and urban planning in Haikou.This study utilizes fiber Bragg grating(FBG)borehole displacement monitoring technology to analyze vertical displacement data from seven boreholes over two years,determining current subsidence rates and investigating influencing factors.Key findings include:(1)Displacement rates at seven boreholes range from-8.40 mm/a to 18.78 mm/a,with average subsidence and uplift rates of-3.10 mm/a and 4.42 mm/a respectively.(2)Deformation exhibits distinct vertical stratification,primarily concentrated in shallow subsurface layers,potentially explaining the limited surface deformation observed.(3)Subsidence rates show positive correlation with stratum bearing capacity,indicating tectonic activity as the dominant control mechanism,while geological processes like sand liquefaction and soft soil creep appear less influential.(4)The tectonic framework reveals differential movement patterns:subsidence within the Dongzhai Port graben contrasts with uplift in adjacent horsts,spatially consistent with structural controls from the Puqian-Qinglan fault system.

关 键 词：光纤光栅 FBG 钻孔位移 东寨港 沉降 

分 类 号：P315.7[天文地球—地震学]