摘要
为定量描述滑坡空间变形特征,在对滑坡体地形地貌和地质构造勘察基础上,采用全球定位系统地表绝对位移监测、光纤光栅深部变形监测和自动拉线式裂缝变形监测综合监测技术,结合重庆市玉台村滑坡裂缝变形特点,综合分析玉台村滑坡空间变形规律和失稳破坏机制。结果表明:1)综合全球定位系统监测、光纤监测和自动拉线式裂缝监测的方法有利于从地表变形、深部变形和裂缝变形方面对玉台村滑坡三维变形特征进行全面分析,是一种高效经济、优势互补的监测方法。2)玉台村滑坡表现出深层滑体的阶段性变形特征。在失稳前期,滑体后部整体滑动速率较快,变形量随时间近似呈线性增长,且地表变形监测数据的波动对降雨有较强的响应。随着滑动的持续,后缘裂缝变形逐渐退出增长阶段,靠近中部滑体的裂缝变形仍较为活跃,变形差异与地形陡缓有关。3)不利的地形与汇水条件、连续降雨、基岩隔水性以及坡前切脚与坡后堆载构成了滑坡变形的主控因素。
In order to quantitatively describe the spatial deformation characteristics of landslides,based on the survey of the topography,landform and geological structure of Yutaicun Village Landslide in Chongqing,advanced comprehensive monitoring technology including absolute surface-displacement monitoring by GPS,deep deformation monitoring by Fiber Bragg Grating and crack-deformation monitoring by automatic pull-lines were conducted.Combined with the characteristics of crack deformation of Yutaicun Village Landslide,the spatial deformation law and instability failure mechanism of the landslide were analyzed comprehensively.The results showed that:1)The comprehensive monitoring methods were conducive to comprehensive analysis of the three-dimensional deformation characteristics of Yutaicun Village Landslide in terms of surface deformation,deep deformation and crack deformation.It was an efficient,economical,and complementary monitoring method.2)The deformation monitoring data of Yutaicun Village Landslide showed the characteristics of phased deformation for deep sliding bodies.In the early stage of instability,the overall sliding rate of the rear part of the landslide was relatively faster,and the amount of deformation increased approximately linearly with time,and the fluctuation of the surface monitoring data had a strong response on rainfall.With the development of sliding,the crack deformation at the trailing edge gradually withdrew from the growth stage,and the crack deformation near the middle sliding body was still more active,and the difference in deformation was related to the steep terrain.3)The unfavorable terrain and water catchment condition,continuous rainfall,water resistance of bedrock,front cut slope and back-slope stacking constitute the main controlling factors for landslide deformation.
作者
张帅
贺拿
钟卫
杨波
ZHANG Shuai;HE Na;ZHONG Wei;YANG Bo(Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China;School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Chongqing Geology Construction(Group)Co.,Ltd,Chongqing 401121,China)
出处
《工业建筑》
CSCD
北大核心
2022年第2期90-95,共6页
Industrial Construction
基金
国家重点研发计划课题(2020YFD1100701)
中国国家铁路集团有限公司科技研究开发计划课题(K2019G006)
国家自然科学基金项目(41302284)。
关键词
滑坡
综合监测
变形分析
滑动机制
landslide
comprehensive monitoring
deformation analysis
sliding mechanism
