黄土填方场地强夯与分层碾压施工过程的内部沉降监测方法  

Layered settlement monitoring method of loess filled foundation during dynamic compaction and layered compaction

作　　者：于永堂 张继文[3] 董宝志 唐丽云 黄鑫[2] 曹静远[2] YU Yong-tang;ZHANG Ji-wen;DONG Bao-zhi;TANG Li-yun;HUANG Xin;CAO Jing-yuan(China United Northwest Institute for Engineering Design&Research Co.,Ltd.,Xi’an 710077,Shaanxi,China;College of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,Shaanxi,China;China Jikan Research Institute of Engineering Investigations and Design,Co.,Ltd.,Xi’an 710021,Shaanxi,China;Shanxi Jinbaodao Foundation Engineering Co.,Ltd.,Taiyuan 030031,Shanxi,China;School of Civil Engineering,Xi’an University of Science and Technology,Xi’an 710054,Shaanxi,China)

机构地区：[1]中联西北工程设计研究院有限公司,陕西西安710077 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]机械工业勘察设计研究院有限公司,陕西西安710021 [4]山西金宝岛基础工程有限公司,山西太原030031 [5]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《地基处理》2023年第S02期54-61,68,共9页Journal of Ground Improvement

基　　金：陕西省秦创原“科学家+工程师”队伍建设项目(2022KXJ-086);陕西省技术创新引导专项(基金)计划项目(2020CGHJ-002)。

摘　　要：黄土填方场地采用强夯法与分层碾压法处理时,会引起较大的冲击荷载与振动荷载,导致施工期埋设的监测元件易被破坏且补救困难。为此结合填方场地施工特点,对深层沉降标法、电磁式沉降仪法和串接式位移计法进行改进,主要包括:当采用深层沉降标法时,施工期将沉降钢板预埋至填土内不同高程,竣工后钻孔测量沉降钢板的高程变化,确定施工期总沉降,然后利用同一钻孔安装深层沉降标,采用水准测量方法观测工后沉降;当采用电磁式沉降仪法时,将沉降管及沉降磁环通过钻孔与探井安装至填土地基内,沉降管端部深入基岩内,将基岩内安装的沉降磁环作为相对基准点观测内部沉降,以减少施工期管口高程频繁变化引起的测量误差;当采用串接式位移计法时,在填方地基内同一垂直线方向,设置若干位移计监测单元,通过分段测量、逐段累加方法,获得填方场地不同深度处的沉降量。上述监测方法的集成应用实现了填方地基内部沉降的全程、连续监测,也可为类似工程监测提供参考。When dynamic compaction and layered rolling compaction methods are used for loess filled foundation treatment,the construction process can cause large impact loads and vibration loads,resulting in easy destruction of monitoring elements buried during construction and difficult remediation.Therefore,based on the construction characteristics,the monitoring methods for layered settlement using deep settlement measurement marker,electromagnetic settlement gauge,and series displacement meter have been modified.The deep settlement measurement marker is to embed the settlement steel plate to different elevations in the fill during the construction period.After completion,the boreholes above settlement steel plate were drilled to measure the elevation changes of the steel plates,so the total settlement during the construction period can be determined.And then use the same boreholes to install deep settlement markers,using leveling methods to observe the post-construction settlement.The electromagnetic settlement gauge is to install the settlement pipe and settlement magnetic ring into the filled foundation through drilling boreholes and excavating exploratory wells,and the end of the settlement pipe needs to be embedded into the bedrock.The settlement magnetic ring installed in the bedrock is used as a relative reference point to observe internal settlement,reducing measurement errors caused by frequent changes in pipe orifice elevation during construction.The series displacement meter is to set up several displacement meter monitoring units in the same vertical direction within the filled foundation,and obtain the settlement at different depths of the filled foundation through sectional measurement and piecewise accumulation method.The integrated application of the above monitoring methods has realized the complete,continuous,and automated monitoring of layered settlement of the fill foundation,and can also provide a reference for similar projects.

关 键 词：黄土填方场地 强夯 分层压实 内部沉降 监测方法 

分 类 号：TU443[建筑科学—岩土工程]