滇中引水工程区形变场特征分析  

Analysis on deformation field characteristics in central Yunnan water diversion project area

作　　者：付平 陆进彬 李志荣 董志宏[1] 吴荣琴 尹健民[1] FU Ping;LU Jinbin;LI Zhirong;DONG Zhihong;WU Rongqin;YIN Jianmin(Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China;Yunnan Dianzhong Water Diversion Engineering Co.,Ltd.,Kunming 650000,China)

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010 [2]云南省滇中引水工程有限公司,云南昆明650000

出　　处：《人民长江》2023年第5期140-148,共9页Yangtze River

基　　金：中央级公益性科研院所基本科研业务费专项资助项目(CKSF 2021462/YT);云南省重大科技专项计划项目(202002AF080003)。

摘　　要：为分析滇中引水工程区的形变场特征,基于多期次GNSS观测及跨断层监测资料,借助速度场聚类与最小二乘配置算法,以及断层刚体运动等模型,推求了该区域主要断裂的现今活动速率和区域应变率分布,解算了活动断裂三维运动变化过程。研究表明:小金河-丽江断裂南段和小江断裂南段是两个强烈的地表变形区,楚雄段所在区域的构造运动相对稳定;建水盆地东缘断裂一带的剪应力积累水平较高;丽江-剑川断裂南段在2011年前后由张扭逐渐转变为压扭运动性质;2018年后,丽江-剑川断裂南段走滑速率较低,曲江断裂南东段的拉张活动强烈。研究成果可为穿越活动断裂的长线工程场地稳定性分析和结构抗错断设计提供参考依据。In order to analyze the characteristics of deformation field in central Yunnan water diversion project area,based on multistage GNSS observation data,cross-fault monitoring data,and by means of velocity field clustering,least squares collocation algorithm and with fault rigid-body motion model,current movement rates and strain rates of main active faults in this area were deduced,the processes of three dimensional movement of active faults were also resolved.The results indicated that the southern segment of Xiaojinhe-Lijiang fault and Xiaojiang fault had always been two strong deformation zones,the recent regional tectonic movement of Chuxiong segment of the water diversion route was relatively stable.The eastern margin fault of Jianshui basin was characterized as high level of shear stress accumulation.The active mode of southern segment of Lijiang-Jianchuan fault had converted from tensile strike-slip to compressive strike-slip since 2011.After 2018,the southern segment of Lijiang-Jianchuan fault had a lower strike-slip rate,while the extension of southeast segment of Qujiang fault was strong.The research results can provide reference for stability analysis of cross-fault long line project sites and faults movement resistance design of engineering structures.

关 键 词：活动断裂 断裂活动速率 应变率场 活动特征 滇中引水工程 

分 类 号：P541[天文地球—构造地质学]