The spatial and temporal deformation patterns and deformation control indicators of highfill foundations directly affect the design,construction and operational safety of high-fill projects.In situ monitoring can comp...The spatial and temporal deformation patterns and deformation control indicators of highfill foundations directly affect the design,construction and operational safety of high-fill projects.In situ monitoring can comprehensively reflect the deformation of high-fill during and after construction.In this paper,we have first designed and installed an integrated wireless remote monitoring system for high-fill to achieve real-time dynamic monitoring of settlement,pore water pressure and soil pressure of the fill foundation.Based on the monitoring results of nearly one year of the construction period and two years after construction,it was found that the deformation amount and deformation rate of the high-fill foundation showed a non-linear growth relationship with the filling rate and filling height.The settlement deformation of the high-fill foundation during the loading period was mainly dominated by the original foundation soil,accounting for 54.4%of the total settlement on average;the settlement deformation during the post-construction period was mainly dominated by the filling body,accounting for 77.04%of the total settlement on average,and the settlement deformation during the post-construction period mainly occurred in the first year after construction.The analysis of the deformation mechanism suggests that the deformation of the filling body is dominated by exhaust consolidation during the loading period and drainage consolidation during the post-construction period;the deformation of the original foundation soil is dominated by drainage consolidation during the loading period and drainage consolidation develops slowly during the post-construction period.It is recommended that the original foundation should be reinforced before the large area filling construction,and that the filling rate should be strictly controlled during construction.The research results can provide a scientific basis for deformation calculation and stability assessment of high-fill foundations.展开更多
为了分析隧道浅埋段的地表沉降变形规律,文中以某高速公路隧道为例,对隧道浅埋段的地表纵向及横向沉降量以及沉降量变化速率曲线进行研究。结果表明,随着掌子面距断面距离的增加,A1监测点位置的地表沉降量基本维持在67 mm, A3、A5、A7...为了分析隧道浅埋段的地表沉降变形规律,文中以某高速公路隧道为例,对隧道浅埋段的地表纵向及横向沉降量以及沉降量变化速率曲线进行研究。结果表明,随着掌子面距断面距离的增加,A1监测点位置的地表沉降量基本维持在67 mm, A3、A5、A7监测点位置的地表累计沉降量表现为先快速下降后缓慢下降的变化规律。所有监测断面的地表沉降量分布曲线表现为凸谷的形状,越靠近隧道中心轴线位置,沉降量越大;距离洞口越远,地表沉降量越小。沉降速率值以隧道轴线对称,越靠近隧道轴线的沉降量变化速率越低;随着开挖的推进,且距离洞口越近,沉降量变化速率不断减小。展开更多
提出一种地基真孔径雷达(Ground-Based Real Aperture Radar,GB-RAR)变形信息估计方法,将该方法应用于上海某地铁线路盾构隧道下穿E大桥的安全监测与分析。基于GB-RAR数据进行分析推导,得到桥梁的沉降变形时间序列,并通过水准测量进行...提出一种地基真孔径雷达(Ground-Based Real Aperture Radar,GB-RAR)变形信息估计方法,将该方法应用于上海某地铁线路盾构隧道下穿E大桥的安全监测与分析。基于GB-RAR数据进行分析推导,得到桥梁的沉降变形时间序列,并通过水准测量进行了验证,精度优于0.27 mm。通过功率谱分析和最大似然估计,去除彩色噪声比,不考虑彩色噪声影响的变形监测信息更准确,与水准测量结果更加吻合。研究结果表明,该方法在本次工作中具有可靠性和有效性,桥梁在监测期内稳定、安全。展开更多
基金supported by the Youth Science and Technology Fund Program in Gansu Province(20JR5RA434 and 20JR10RA200)National Natural Science Foundation of China(52168051)+1 种基金Gansu Province University Innovation Fund Project(2020A031)Gansu Provincial Science and Technology Plan Fund Project(22CX8GA112)。
文摘The spatial and temporal deformation patterns and deformation control indicators of highfill foundations directly affect the design,construction and operational safety of high-fill projects.In situ monitoring can comprehensively reflect the deformation of high-fill during and after construction.In this paper,we have first designed and installed an integrated wireless remote monitoring system for high-fill to achieve real-time dynamic monitoring of settlement,pore water pressure and soil pressure of the fill foundation.Based on the monitoring results of nearly one year of the construction period and two years after construction,it was found that the deformation amount and deformation rate of the high-fill foundation showed a non-linear growth relationship with the filling rate and filling height.The settlement deformation of the high-fill foundation during the loading period was mainly dominated by the original foundation soil,accounting for 54.4%of the total settlement on average;the settlement deformation during the post-construction period was mainly dominated by the filling body,accounting for 77.04%of the total settlement on average,and the settlement deformation during the post-construction period mainly occurred in the first year after construction.The analysis of the deformation mechanism suggests that the deformation of the filling body is dominated by exhaust consolidation during the loading period and drainage consolidation during the post-construction period;the deformation of the original foundation soil is dominated by drainage consolidation during the loading period and drainage consolidation develops slowly during the post-construction period.It is recommended that the original foundation should be reinforced before the large area filling construction,and that the filling rate should be strictly controlled during construction.The research results can provide a scientific basis for deformation calculation and stability assessment of high-fill foundations.
文摘为了分析隧道浅埋段的地表沉降变形规律,文中以某高速公路隧道为例,对隧道浅埋段的地表纵向及横向沉降量以及沉降量变化速率曲线进行研究。结果表明,随着掌子面距断面距离的增加,A1监测点位置的地表沉降量基本维持在67 mm, A3、A5、A7监测点位置的地表累计沉降量表现为先快速下降后缓慢下降的变化规律。所有监测断面的地表沉降量分布曲线表现为凸谷的形状,越靠近隧道中心轴线位置,沉降量越大;距离洞口越远,地表沉降量越小。沉降速率值以隧道轴线对称,越靠近隧道轴线的沉降量变化速率越低;随着开挖的推进,且距离洞口越近,沉降量变化速率不断减小。
文摘提出一种地基真孔径雷达(Ground-Based Real Aperture Radar,GB-RAR)变形信息估计方法,将该方法应用于上海某地铁线路盾构隧道下穿E大桥的安全监测与分析。基于GB-RAR数据进行分析推导,得到桥梁的沉降变形时间序列,并通过水准测量进行了验证,精度优于0.27 mm。通过功率谱分析和最大似然估计,去除彩色噪声比,不考虑彩色噪声影响的变形监测信息更准确,与水准测量结果更加吻合。研究结果表明,该方法在本次工作中具有可靠性和有效性,桥梁在监测期内稳定、安全。
