| 土质滑坡地表倾斜变形特征与基于MEMS的倾斜变形监测技术初探 |
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| 引用本文： | 刘晓宇,樊智勇,吴疆.土质滑坡地表倾斜变形特征与基于MEMS的倾斜变形监测技术初探[J].中国地质灾害与防治学报,2020,31(6):69-77. |
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| 作者姓名： | 刘晓宇 樊智勇 吴疆 |
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| 作者单位： | 1. 中国科学院力学研究所流固耦合系统力学重点实验室, 北京 100190; |
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| 基金项目： | 国家重点研发计划（2016YFC0802103）；重庆市规划和自然资源局项目"地质灾害智能化监测预警方法研究与示范"（KJ-2019007） |
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| 摘 要： | 随着现代信息技术快速发展，人们获取滑坡现场各类监测信息的能力越来越强，积累的现场监测数据也愈来愈多，如何充分、精细化地利用监测数据已成为滑坡监测预警工作中重点关注的问题。为此，本文以土质滑坡为研究对象，采用强度折减有限元方法开展地表倾斜变形时空演化特征理论研究，发现地表倾斜变形在滑动面扩展至贯通期间出现"速率排序跃迁"现象，在滑动面贯通后出现"速率突变"现象。采用地表倾斜变形与内部滑动面之间的这种定量化关联特性，可以为土质滑坡中短期预测预报方法研究提供新的视角和方向。利用理论研究成果，本文进一步开展地表倾斜变形监测关键技术研究，讨论基于MEMS加速度计的倾角传感器的测量原理与测量精度，分析环境温差波动对倾角测量误差的影响，最后介绍基于竖直倾角测量方式研制的普适型滑坡地表倾斜变形监测设备——坡体浅层倾斜变形测量仪。
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| 关 键 词： | 土质滑坡 预测预报 地表变形 时空演化 数值模拟 监测技术 |
| 收稿时间： | 2020-08-25 |
Evolution of deformation and monitoring techniques of surface tilt for soil landslides using MEMS technique |
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| Affiliation: | 1. Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;2. Chongqing Wanzhou Institute of Geological Environment Monitoring, Chongqing 404000, China |
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| Abstract: | With the rapid development of modern information technology,the ability to obtain various monitoring information of landslide is becoming stronger and stronger,and the field monitoring data accumulated is also more and more. How to make full use of the monitoring data has become a key issue in landslide monitoring and early warning work. Therefore,soil landslide is taken as the research object in this paper,and the strength reduction finite element method is used to study the temporal-spatial evolution characteristics of surface tilt deformation. It is found that the so-called "rate sequence transition" occurs during the period from sliding surface extension to breakthrough,and the so-called "rate mutation" occurs after the sliding surface passes through. The quantitative correlation between the surface tilt deformation and the internal sliding surface can provide a new perspective and direction for the study of medium and short-term prediction of soil landslides. With the help of theoretical results,this paper further studies the key techniques of surface tilt deformation monitoring,discusses the measurement principle and measurement accuracy of inclination sensor based on MEMS accelerometer,analyzes the influence of environmental temperature difference fluctuation on inclination measurement error,and finally introduces a universal landslide surface tilt deformation monitoring equipment-Shallow deformation measuring instrument for slope. |
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