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[1]胡长明,林成,赵金凤,等.黄土深基坑降水诱发的地基附加应力和沉降简化计算*[J].中国安全生产科学技术,2022,18(4):160-167.[doi:10.11731/j.issn.1673-193x.2022.04.023]
　HU Changming,LIN Cheng,ZHAO Jinfeng,et al.Simplified calculation of foundation additional stress and settlement caused by precipitation of loess deep foundation pit[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2022,18(4):160-167.[doi:10.11731/j.issn.1673-193x.2022.04.023]
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黄土深基坑降水诱发的地基附加应力和沉降简化计算*
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
18
期数:
2022年4期
页码:
160-167
栏目:
职业安全卫生管理与技术
出版日期:
2022-04-30

文章信息/Info

Title:
Simplified calculation of foundation additional stress and settlement caused by precipitation of loess deep foundation pit
文章编号:
1673-193X(2022)-04-0160-08
作者:
胡长明; 林成; 赵金凤; 刘林; 路乾
(1.西安建筑科技大学 土木工程学院，陕西 西安 710055；
2.陕西省岩土与地下空间工程重点实验室，陕西 西安 710055)
Author(s):
HU Changming;  LIN Cheng;  ZHAO Jinfeng;  LIU Lin;  LU Qian
(1.School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an Shaanxi 710055,China;
2.Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi’an Shaanxi 710055,China)
关键词:
黄土地区; 基坑降水; 地面沉降; 侧摩阻力; 弦线模量
Keywords:
loess area;  precipitation of foundation pit;  ground settlement;  lateral friction resistance;  chord modulus
分类号:
X947
DOI:
10.11731/j.issn.1673-193x.2022.04.023
文献标志码:
A
摘要:
为预测黄土地区深基坑降水导致的地层不均匀沉降，确保坑周建筑物安全，基于弦线模量法、弹性半无限体理论和剪切位移法，将坑周土体以降水曲线为界分为疏干区和饱和区，综合考虑绕渗区内渗流力在水平方向的分量和桩-土界面侧摩阻力对土体的约束作用，推导降水引起地基附加应力和地面沉降的理论计算公式，将理论计算值与工程实际监测数据对比分析。研究结果表明：改进后的计算方法能反应出浸润曲线以下土层所受附加应力的衰减效应；地面沉降受侧摩阻力的约束作用主要局限于1倍的最大水位沉降范围内；弦线模量计算得到的沉降值精度高于规范算法，能够较好地预测黄土地区降水期间坑周地面沉降量。研究结果可为计算类似黄土深基坑潜水层降水诱发地面沉降提供参考。
Abstract:
In order to predict the uneven settlement of stratum caused by the precipitation of deep foundation pit in loess area,thus ensure the safety of the buildings around the pit,based on the chord modulus method,elastic semi-infinite element theory and shear displacement method,the soil around the pit was divided into the drained zone and the saturated zone by the precipitation curve.Comprehensively considering the component of seepage force in horizontal direction in the by-pass seepage zone and the constraint effect of lateral friction resistance located in soil-pile interface towards soil,the theoretical calculation formula of foundation additional stress and ground settlement caused by precipitation was deduced,and the theoretical calculation values were compared with the actual monitoring data of project.The results showed that the improved calculation method could reflect the attenuation effect of additional stress on soil layer under infiltration curve.The constraint effect of ground settlement by lateral friction resistance was mainly limited to the range of 1 times the maximum drawdown of water level.The accuracy of settlement value calculated by the chord modulus based on the structural parameters was much higher than that of the normative algorithm,which could better predict the amount of ground settlement around the pit during the precipitation period in loess area.

参考文献/References:

［1］祝磊,彭建,刘金龙.地铁车站深基坑建设对邻近建筑物安全的影响评估［J］.中国安全生产科学技术,2015,11(12):85-92. ZHU Lei,PENG Jian,LIU Jinlong.Evaluation on influence by construction of deep foundation pit in subway station to safety of adjacent buildings［J］.Journal of Safety Science and Technology,2015,11(12):85-92.
［2］孙廉威,颜超,程子聪.既有大型公共设施改造下紧邻深基坑开挖变形分析［J］.中国安全生产科学技术,2020,16(11):96-102. SUN Lianwei,YAN Chao,CHENG Zicong.Deformation analysis of deep foundation pit excavation adjacent to reconstruction of existing large public facility［J］.Journal of Safety Science and Technology,2020,16(11):96-102.
［3］许锡金,李东霞.基坑降水引起地面沉降计算方法研究［J］.岩土工程技术,2004,18(4):194-198. XU Xijin,LI Dongxia.Study on calculating method of ground subsidence caused by Pit-dewatering ［J］.Geotechnical Engineering Technique,2004,18(4):194-198.
［4］金小荣,俞建霖,祝哨晨,等.基坑降水引起周围土体沉降性状分析［J］.岩土力学,2005,26(10):54-60. JIN Xiaorong,YU Jianlin,ZHU Shaochen,et al.Analysis of behaviors of settlement of pit’s surrounding soils bydewatering［J］.Rock and Soil Mechanics,2005,26(10):54-60.
［5］杨清源,赵伯明.潜水层基坑降水引起地表沉降试验与理论研究［J］.岩石力学与工程学报,2018,37(6):1506-1519. YANG Qingyuan,ZHAO Boming.Experimental and theoretical study on the surface subsidence by dewatering of foundation pit in phreatic aquifer［J］.Chinese Journal of Rock Mechanics and Engineering,2018,37(6):1506-1519.
［6］王正泓.黄土地基变形的弦线模量分析方法研究［D］.西安:西安理工大学,2010.
［7］邵生俊,王丽琴,陶虎,等.黄土的构度及其与粒度、密度、湿度之间的关系［J］.岩土工程学报,2014,36(8):1387-1393. SHAO Shengjun,WANG Liqin,TAO Hu,et al.Structural index of loess and its relation with granularity,density and humidity［J］.Chinese Journal of Geotechnical Engineering.2014,36(8):1387-1393.
［8］陶虎,邵生俊,王正泓,等.结构性参数在黄土地基沉降计算中的应用研究［J/OL］.地震工程学报,2020,7(10):93［2021-06-14］.https://kns.cnki.net/kcms/detail/62.1208.P.20200611.1703.044.html.
［9］XU Y S,WU H N,WANG Z F,et al.Dewatering induced subsidence during excavation in a Shanghai soft deposit［J］.Environmental Earth Sciences,2017,76(9):351-366.
［10］WANG J X,DENNG Y S,MA R Q,et al.Field experiment and numerical simulation of coupling non-Darcy flow caused by curtain and pumping well in foundation pit dewatering［J］.Journal of Hydrology,2017,549(6):277-293.
［11］吴意谦,朱彦鹏.考虑疏干带非饱和土影响下基坑降水引起地面沉降的计算［J］.工程力学,2016,33(3):179-187. WU Yiqian,ZHU Yanpeng.Calculation of settlement considering unsaturated soil influence on the dewatering of foundation pits［J］.Engineering Mechanics,2016,33(3):179-187.
［12］黄显贵,陈梁,刘御刚,等.基坑降水引起的地基附加应力及沉降简化计算［J］.地下空间与工程学报,2017,13(3):746-752. HUANG Xiangui,CHEN Liang,LIU Yugang,et al.Simplified calculation of ground settlement and additional stress caused by foundation pit dewatering［J］.Chinese Journal of Underground Space and Engineering,2017,13(3):746-752.
［13］中华人民共和国建设部.建筑桩基础技术规范：JGJ 94—2008 ［S］.北京：中国建筑工业出版社，2008.
［14］高旭,郭建波,晏鄂川.考虑止水帷幕的深基坑降水预测解析计算［J］.岩土力学,2018,39(4):1431-1439. GAO Xu,GUO Jianbo,YAN Echuan.Dewatering forecast of deep foundation pit considering waterproof curtain using analytic approach［J］.Rock and Soil Mechanics,2018,39(4):1431-1439.
［15］娄平,赵星,汤卓,等.朝阳站富水砂卵石层施工动态降水控制技术研究［J］.铁道科学与工程学报,2019,16(2):457-463. LOU Ping,ZHAO Xing,TANG Zhuo,et al.Study on dynamic dewatering control technology for water-rich sandy gravel layer in Chaoyang station［J］.Journal of Railway Science and Engineering,2019,16(2):457-463.
［16］施成华,蒋劲,雷明锋,等.考虑降水动态过程的地下工程施工降水优化设计［J］.铁道科学与工程学报,2017,14(8):1597-1605. SHI Chenghua,JIANG Jin,LEI Mingfeng,et al.Optimal design of construction dewatering of underground engineering with the consideration of dynamic dewatering process［J］.Journal of Railway Science and Engineering,2017,14(8):1597-1605.

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备注/Memo

备注/Memo:
收稿日期： 2021-03-21
* 基金项目： 国家自然科学基金项目（51408463）；陕西省教育厅专项科研计划项目（17JK0424）
作者简介： 胡长明，博士，教授，主要研究方向为地下工程施工。
更新日期/Last Update: 2022-05-13