基坑降水引起周围土体沉降性状分析
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摘要
从影响基坑周围土体沉降的诸多因素中选出3个主要因素:弹性模量、降水深度和渗透系数,利用二维有限元法分析了它们对基坑周围土体沉降性状的影响。同时通过建立二维有限元模型,研究了工程上采用的回灌和止水措施对减小地表变形的作用。研究表明,使用回灌井、回灌沟或止水帷幕措施可减小地表总沉降和不均匀沉降。
From many influence factors which affected the deformation of foundation pit’s surrounding soils, three main effective factors such as Young’s modulus, dewatering depth and the permeability coefficient had been chosen as the significantly important factors for input in the 2-D FEA model and the behaviors of settlement were then analyzed. Furthermore, by the 2-D FEA model, the effect of the reduction of the surface settlement due to different distances of recharge or the depth of water-sealing was studied. The obtained results verified that the surface settlement and surface differential settlement of the ground surface could be largely reduced by recharging or water-sealing.
From many influence factors which affected the deformation of foundation pit’s surrounding soils, three main effective factors such as Young’s modulus, dewatering depth and the permeability coefficient had been chosen as the significantly important factors for input in the 2-D FEA model and the behaviors of settlement were then analyzed. Furthermore, by the 2-D FEA model, the effect of the reduction of the surface settlement due to different distances of recharge or the depth of water-sealing was studied. The obtained results verified that the surface settlement and surface differential settlement of the ground surface could be largely reduced by recharging or water-sealing.
引文
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[4]张永波,孙新忠.基坑降水工程[M].北京:地震出版社,2000.
[5]谢康和,柳崇敏,应宏伟,等.成层土中基坑开挖降水引起的地表沉降分析[J].浙江大学学报(工学版),2003,36(3):239-242.XIE Kang-he,LIU Chong-min,YING hong-wei,et al.Analysis of settlement induced dewatering during excavation in layered soil[J].Journal of Zhejiang University(Engineering Science),2003,36(3):239-242.
[6]王晓鸿,仵彦卿.渗流场-应力场耦合分析[J].勘察科学技术,1998,(4):3-6.WANG Xiao-hong,WU Yang-qing.Coupling analysis of seepage field-stress field[J].Science and Technology of Survey,1998,(4):3-6.
[7]杨林德,杨志锡.各向异性饱和土体的渗流耦合分析和数值模拟[J].岩石力学与工程学报,2002,21(10):1447-1451.YANG Lin-de,YANG Zhi-xi.Coupling analyses and numeric simulations on seepage flow in anisotropicsaturated soils[J].Chinese Journal of Rock Mechnicals and Engineering,2002,21(10):1447-1451.
[8]杨志锡,叶为民,杨林德.基坑工程中应力场与渗流场直接耦合的有限元法[J].勘察科学技术,2001,(3):32-36.YANG Zhi-xi,YEI Wei-min,YANG Lin-de.The finite element method of direct coupling between the stress field and the seepage field of foundation pit projects[J].Science and Technology of Survey,2001,(3):32-36.
[9]姜晨光,贺勇,盖玉松,等.基坑工程周边地面沉降的监测与初步分析[J].建筑技术,2003,34(2):102-103.JIANG Chen-guang,HE Yong,GAI Yu-song,et al.Monitoring and initial analysis of surface settlement neighboring to excavation works[J].Architecture Technology,2003,34(2):102-103.
[10]龚晓南.土工计算机分析[M].北京:中国建筑工业出版社,1999.
[11]钱家欢,殷宗泽.土工原理与计算[M].南京:中国水利水电出版社,1996.
[12]张建峰.井点降水在基坑工程中的应用及降水引起的地表沉降的研究[硕士学位论文D].上海:同济大学,1999.
[13]马荣华.苏州伊莎中心大厦二级轻型井点回灌施工技术[J].施工技术,1997,(1):26-27.MA Rong-hua.The recharge construction technology by two-stage light-wells at Suzhou Yisha Central Mansion[J].Construction Technology,1997,(1):26-27.
[14]朱必毅,范强.某工程深基础降水及对周围建筑物的影响与防治[J].煤矿设计,2000,(2):35-38.ZHU Bi-yi,FAN Qiang.The dewatering of some deep foundation and its effect and control for surrounding buildings[J].Coal Mining Design,2000,(2):35-38.
[15]俞建霖,龚晓南.基坑工程地下水回灌系统的设计与应用技术研究[J].建筑结构学报,2001,(5):70-74.YU Jian-lin,GONG Xiao-nan.Study on design and application of groundwater recharge system in excavation[J].Journal of Building Structures,2001,(5):70-74.
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