«上一篇/Previous Article|本期目录/Table of Contents|下一篇/Next Article»

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

29卷

期数:

2012年04期

页码:

96-105

栏目:

出版日期:

2012-12-30

文章信息/Info

Title:

Influence of Soil Mass Reinforcement Scope in Passive Zone on Whole Deep Excavation

作者:

蒋建平

上海海事大学 海洋环境与工程学院,上海 201306

Author(s):

JIANG Jian-ping

School of Ocean Environment and Engineering, Shanghai Maritime University, Shanghai 201306, China

关键词:

加固;  被动区;  深基坑;  地面沉降;  坑底隆起;  弯矩;  剪力;  轴力

Keywords:

reinforcement;  passive zone;  deep excavation;  ground settlement;  heave of pit bottom;  bending moment;  shearing force;  axial force

分类号:

TU432

DOI:

-

文献标志码:

A

摘要:

基于数值模拟方法探讨了被动区土体(坑底土体)加固范围对整个基坑的影响; 建立了地面沉降最大值、坑底隆起最大值、支护墙顶水平向位移和基坑整体稳定性安全系数分别与加固深度、加固宽度的关系曲线。研究结果表明:随着加固范围(加固深度或加固宽度)的扩大,整个基坑的变形减小且趋向均匀,结构的受力变得合理,主要表现为坑底隆起总体减小,地面沉降、支护墙弯矩(或剪力或轴力)、支护墙水平向位移(除支护墙顶水平向位移稍有增加外)明显减小,且趋于某一稳定值; 当加固宽度为整个宽度的一半(即为7.5 m)时,不同加固深度的坑底隆起曲线为近于平行的台阶型曲线束,而当加固宽度为15 m时,坑底隆起曲线为近于平行的平缓型曲线束; 当加固深度不变而加固宽度逐渐增大时,靠近坑壁的坑底隆起值明显减小,高隆起区范围逐渐缩小,特别是全宽度加固时,已无高隆起区; 随着加固范围的增大,整个基坑的稳定性安全系数增大; 坑底土体的加固对基坑是有利的; 加固范围中存在适当的加固深度,而加固宽度越大越好。

Abstract:

Based on numerical simulation method, the influence of soil mass reinforcement scope in passive zone(the bottom of deep excavation)on whole deep excavation was studied. The correlativity curves(the maximum of ground settlement, the maximum of heave value of bottom, the horizontal displacement of wall top and the stability safety factor of whole deep excavation versus the reinforcement depth and the reinforcement width)were established. The study results show that with the enlargement of soil mass reinforcement scope(the reinforcement depth or the reinforcement width), the displacement of the whole deep excavation decreases and tends to uniformity, the force of the construction becomes rational. The heave of bottom reduces as a whole, the settlement of ground, the bending moment(or shearing force or axial force)of the supporting wall and the horizontal displacement of supporting wall(except for the top of the wall whose horizontal displacement increase slightly)decrease obviously and tend to steady values; when the reinforcement width is 7.5 m(the half of whole reinforcement width), the heave curves of the bottom of deep excavation with different reinforcement depths are almost parallel step-like pencil of curves, and when the reinforcement width is 15 m, the heave curves of the bottom of deep excavation with different reinforcement depths are almost parallel gently pencil of curves; with the stepwise increase of reinforcement width(here the reinforcement depth value is constant), the heave value of pit bottom reduces obviously, the scope of higher heave zone dwindles gradually, especially, the scope of higher heave zone is zero when the reinforcement width is 15 m; the stability safety factor of whole deep excavation increases with the increase of the reinforcement scope. The soil mass reinforcement in passive zone is favorable to deep excavation; there exists appropriate reinforcement depth, and the wider the reinforcement width is, the better is.

参考文献/References:

[1] 秦会来,黄茂松,马少坤.黏土基坑抗隆起稳定分析的多块体上限解[J].岩石力学与工程学报,2010,29(1):73-81. QIN Hui-lai,HUANG Mao-song,MA Shao-kun.Multi-block Upper Bound Method for Basal Heave Stability Analysis of Braced Excavations in Clay[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(1):73-81.
[2]ZHOU N Q,VERMEER P A,LOU R X,et al.Numerical Simulation of Deep Foundation Pit Dewatering and Optimization of Controlling Land Subsidence[J].Engineering Geology,2010,114(3/4):251-260.
[3]TANG Y G,KUNG G T C.Investigating the Effect of Soil Models on Deformations Caused by Braced Excavations Through an Inverse-analysis Technique[J].Computers and Geotechnics,2010,37(6):769-780.
[4]YOO C,LEE D.Deep Excavation-induced Ground Surface Movement Characteristics—A Numerical Investigation[J].Computers and Geosciences,2008,35(2):231-252.
[5]王 立.软土深基坑支护设计采用被动区加固案例[J].内江科技,2012(7):144. WANG Li.Example of Soil Stabilization in Passive Area of Foundation Pits for Soft Clay Area[J].Neijiang Science and Technology,2012(7):144.
[6]秦爱芳,胡中雄,彭世娟.上海软土地区受卸荷影响的基坑工程被动区土体加固深度研究[J].岩土工程学报,2008,30(6):935-940. QIN Ai-fang,HU Zhong-xiong,PENG Shi-juan.Depth of Soil Stabilization in Passive Area of Foundation Pits for Shanghai Soft Clay[J].Chinese Journal of Geotechnical Engineering,2008,30(6):935-940.
[7]王玉梅,罗俊国,苏 畅,等.三轴深层搅拌桩加固深基坑被动区土体的应用研究[J].建筑科学,2009,25(1):16-18,15. WANG Yu-mei,LUO Jun-guo,SU Chang,et al.Study on Application of Tri-axial Deep Stirring Piles in Reinforcing Soil in the Passive Area of Foundation Pits[J].Building Science,2009,25(1):16-18,15.
[8]郑俊杰,章荣军,丁烈云,等.基坑被动区加固的位移控制效果及参数分析[J].岩石力学与工程学报,2010,29(5):1042-1051. ZHENG Jun-jie,ZHANG Rong-jun,DING Lie-yun,et al.Displacement Control Effects and Parameter Analysis of Passive Zone Improvement of Foundation Pits[J].Chinese Journal of Rock Mechanics and Engin-eering,2010,29(5):1042-1051.
[9]叶 茂.被动区加固后基坑悬臂支护桩性状研究[J].低温建筑技术,2009,31(4):88-89. YE Mao.Research on the Effect of Floating Pile Working Behavior in Foundation Pit Excavating with Reinforced Passive Soil Region[J].Low Temperature Architecture Technology,2009,31(4):88-89.
[10]王 卿,李小青,张修华.深厚淤泥土基坑工程坑底多孔板加固抗隆起技术[J].华中科技大学学报:城市科学版,2006,23(增1):48-50. WANG Qing,LI Xiao-qing,ZHANG Xiu-hua.Resist Upheave Technique Reinforcing with Porous Board for Deep Foundation Pit Engineering Under Deep and Thick Silt[J].Journal of Huazhong University of Science and Technology:Urban Science Edition,2006,23(S1):48-50.
[11]蒋建平.深基坑坑底加固体的刚度效应研究[J].工程力学,2011,28(6):130-140. JIANG Jian-ping.Study on Stiffness Effect of Reinforcement Mass in Bottom of Deep Excavation[J].Engineering Mechanics,2011,28(6):130-140.
[12]林鸿州,于玉贞,李广信,等.强度折减法有限元法在滑坡特性预测的应用探讨[J].岩土工程学报,2009,31(2):229-233. LIN Hong-zhou,YU Yu-zhen,LI Guang-xin,et al.Finite Element Method with Consideration Shear Strength Reduction for Prediction of Landslide[J].Chinese Journal of Geotechnical Engineering,2009,31(2):229-233.
[13]任建喜,高立新,刘 杰,等.深基坑变形规律现场监测[J].西安科技大学学报,2008,28(3):445-449. REN Jian-xi,GAO Li-xin,LIU Jie,et al.In-situ Monitoring on Deformation Laws of Deep Foundation Pit[J].Journal of Xi'an University of Science and Technology,2008,28(3):445-449.
[14]毛巨省,唐筱慧,高 涛,等.地铁车站基坑围护结构内力与变形规律分析[J].西安科技大学学报,2007,27(2):205-209. MAO Ju-sheng,TANG Xiao-hui,GAO Tao,et al.Inner Force of Bracing Structure and Deformation Laws of Foundation Pit for Subway Station[J].Journal of Xi'an University of Science and Technology,2007,27(2):205-209.
[15]于远祥,吴 霄,郑选荣.上海上中路隧道基坑工程施工监测分析[J].西安科技大学学报,2008,28(3):465-468,541. YU Yuan-xiang,WU Xiao,ZHENG Xuan-rong.Construction Monitor of a Tunnel Excavation Works in Shanghai[J].Journal of Xi'an University of Science and Technology,2008,28(3):465-468,541.

相似文献/References:

[1]屈文俊,卢 瀚,刘扬明.通信设备走线架吊挂系统抗侧性能研究[J].建筑科学与工程学报,2014,31(02):32.
[2]韦建刚,黄 蕾,李佩元,等.旧空心板简支梁桥的连续化改造加固研究[J].建筑科学与工程学报,2014,31(04):103.
　WEI Jian-gang,HUANG Lei,LI Pei-yuan,et al.Research on Continuous Transformation and Reinforcement for Old Simply Supported Hollow Slab Bridge[J].Journal of Architecture and Civil Engineering,2014,31(04):103.
[3]林 峰,黎艳翔,董 羽.CFRP加固钢筋混凝土直剪承载力试验[J].建筑科学与工程学报,2015,32(06):43.
　LIN Feng,LI Yan-xiang,DONG Yu.Experiment on Shear Transfer Capacity of Reinforced Concrete Strengthened with CFRP[J].Journal of Architecture and Civil Engineering,2015,32(04):43.
[4]许 颀,黄 靓.FFRP加固钢筋混凝土梁的受弯性能[J].建筑科学与工程学报,2016,33(03):104.
　XU Qi,HUANG Liang.Flexural Behavior of Reinforced Concrete Beams Strengthened with FFRP[J].Journal of Architecture and Civil Engineering,2016,33(04):104.
[5]蒋 立,王元清,戴国欣,等.负载下焊接加固钢结构压弯构件受力性能的影响因素分析[J].建筑科学与工程学报,2016,33(05):120.
　JIANG Li,WANG Yuan-qing,DAI Guo-xin,et al.Influence Factor Analysis of Mechanical Behavior of Compression-bending Member of Steel Structure Strengthened by Welding Under Load[J].Journal of Architecture and Civil Engineering,2016,33(04):120.
[6]王滋军,朱 建,吴运伸,等.高强钢丝绳悬吊加固预制空心楼板试验研究[J].建筑科学与工程学报,2017,34(03):73.
　WANG Zi-jun,ZHU Jian,WU Yun-shen,et al.Experimental Study on Precast Hollow Slab Strengthened by High-strength Steel Wire Rope Suspension[J].Journal of Architecture and Civil Engineering,2017,34(04):73.
[7]程东辉,杨燕红.预应力CFRP布加固负载混凝土柱轴心受压性能研究[J].建筑科学与工程学报,2017,34(04):34.
　CHENG Dong-hui,YANG Yan-hong.Research on Axial Compressive Properties of Preloaded Concrete Columns Strengthened with Prestressed CFRP Sheets[J].Journal of Architecture and Civil Engineering,2017,34(04):34.
[8]谢开仲,王红伟,周剑希,等.高层工业厂房异常振动测试与加固试验[J].建筑科学与工程学报,2018,35(05):39.
　Experiment on Abnormal Vibration Test and Reinforcement of High-rise Industrial Building[J].Journal of Architecture and Civil Engineering,2018,35(04):39.
[9]于至海,吴旭君,曹文昭.软土深基坑被动区超前加固变形控制效果研究[J].建筑科学与工程学报,2021,38(06):71.[doi:10.19815/j.jace.2021.08056]
　YU Zhi-hai,WU Xu-jun,CAO Wen-zhao.Research on Deformation Control Effect of Passive Zone Reinforcement Before Excavation of Deep Foundation Pit in Soft Soil[J].Journal of Architecture and Civil Engineering,2021,38(04):71.[doi:10.19815/j.jace.2021.08056]

备注/Memo

备注/Memo:

收稿日期:2012-08-22
基金项目:上海海事大学科研基金项目(20120074); 上海海事大学港口、海岸及近海工程重点学科项目(A2120016001X)
作者简介:蒋建平(1966-),男,湖南邵阳人,副教授,工学博士,博士后,E-mail:jjpwx@163.com。

常用功能

更新日期/Last Update: 2012-12-20