黄土高填方地基上部建筑施建控制标准研究
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马云峰(1982—),男,高级工程师,硕士。主要从事岩土工程设计与施工等方面研究。E-mail:19793908@qq.com

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TU443

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陕西省重点研发计划项目(2021SF2-02;2022SF-197);陕西省城市地质与地下空间工程技术研究中心开放性课题(2022KT-01)资助


Study on Construction Control Standard of upper Buildings on Loess High Fill Foundation
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    摘要:

    黄土高填方地基上部建筑的工后沉降及施建时间问题是目前研究的热点。以某黄土沟壑区新区建设中的高填方工程为背景,基于试验段工后沉降监测结果,运用 MIDAS/GTS‐NX 数值反演分析方法来获取填方土体蠕变力学参数,并针对不同偏心距及施建时间下高层和低层建筑物地基的工后沉降特征开展了系统研究。结果表明: (1)基于实测资料的分层迭代反演分析方法所得填土体参数较准确反应黄土高填方土体的实际受荷状态及上部建筑基础的工后沉降特征。(2)当低层或高层建筑偏心距 w=0 m 或 w=221 m 时,局部倾斜最小且均满足局部倾斜 f< 0.002 要求,建议低层建筑施建偏心距 w≥157 m,工后施建时间 t≥1.21 年;高层建筑施建偏心距 w≥155 m,工后施建时间 t≥1.5 年。通过本文的研究,可为类似“上山建城”高填方顶部建筑的施建位置及工后施建时间提供科学参考。

    Abstract:

    The post-construction settlement and construction time of the superstructure on the loess high-fill foundation are the focus of current research. Based on the monitoring results of the post-construction settlement of the test section, the MIDAS/GTS-NX numerical inversion analysis method was used to obtain the creep mechanical parameters of the filled soil, and the post-construction settlement characteristics of the high-rise and low-rise buildings under different eccentricities and construction time were systematically studied. The results show that:(1) The parameters of fill material obtained by layered iterative inversion analysis based on measured data reflect the actual loading state of loess high fill and post-construction settlement behaviour of the upper buildings accurately.(2) For low-rise or high-rise building with eccentricity w=0 m or w=221 m, the local tilt is minimal and all meet the requirements of local tilt f <0.002. It is recommended that for low-rise building construction, the eccentricity w ≥157 m and construction time t ≥1.21 years. For high-rise building construction, the eccentricity w ≥155 m, construction time t ≥1.5 years after construction. Through the research of this paper, it can provide scientific reference for the construction location and construction time of high fill top buildings similar to "building a city up the hill".

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马云峰,彭森,葛苗苗,朱才辉.黄土高填方地基上部建筑施建控制标准研究[J].防灾减灾工程学报,2023,43(6):1415-1424

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  • 收稿日期:2022-07-18
  • 最后修改日期:2022-08-20
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  • 在线发布日期:2024-01-11
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