吉林大学学报(工学版) ›› 2018, Vol. 48 ›› Issue (6): 1712-1724.doi: 10.13229/j.cnki.jdxbgxb20170805

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疏排桩-土钉墙组合支护基坑土拱效应模型试验

古海东1(),罗春红2   

  1. 1. 浙江省交通规划设计研究院,杭州 310006
    2. 浙江公路技师学院 路桥系,杭州310023
  • 收稿日期:2017-08-01 出版日期:2018-11-20 发布日期:2018-12-11
  • 作者简介:古海东(1983-),男,高级工程师,博士.研究方向:岩土工程,桩基础、深基坑工程,软土地基及边坡工程.
  • 基金资助:
    国家自然科学基金项目(40972179)

Experiment on soil arching effect of pit supporting structure with scattered row piles and soil nail wall

GU Hai-dong1(),LUO Chun-hong2   

  1. 1. Zhejiang Provincial Institute of Communications Planning, Design & Research, Hangzhou 310006, China;
    2. Department of Road and Bridge, Zhejiang Highway Technicians College, Hangzhou 310023, China
  • Received:2017-08-01 Online:2018-11-20 Published:2018-12-11

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摘要：

采用同济大学中型岩土离心机进行了8组疏排桩-土钉墙组合支护基坑的离心模型试验。基于离心模型试验结果,提出了疏排桩-土钉墙组合支护基坑桩间土拱效应的最终形态分析模型,并结合三维有限元数值分析探讨了桩间土拱效应的动态发展过程以及桩间距和土钉参数对土拱形态的影响规律。研究结果表明:当桩间距与桩径之比B/D≥8或土钉长度与基坑开挖深度之比L/H≥2/3时,桩间土体无明显土拱效应;当桩间距与桩径之比B/D=4~6且土钉长度与基坑开挖深度之比L/H<2/3时,桩间土拱效应明显;疏排桩-土钉墙组合支护基坑的土拱最终形态表现为沿基坑顶面成抛物线形,延基坑深度方向具有一定直立深度的曲面。

关键词: 岩土工程, 疏排桩, 土钉墙, 土拱效应, 离心机模型试验, 三维有限元分析

Abstract:

Eight groups of centrifuge tests of pit foundation supporting with scattered piles and soil nailing were carried out by Tongji University. Based on the results of eight group tests, the analysis model of the final form of soil arching effect in pit supporting structure with scattered row piles and soil nailing was put forward. Not only the dynamic development process of soil arching effect between piles was explored, but also the effects of the pile spacing and soil nailing parameters on the soil arching pattern was analyzed in combining with three-dimensional finite element numerical simulation. The results show that, for pit supporting structure with scattered row piles and soil nailing, when the ratio of pile spacing to pile diameter is greater than 8 or the ratio of soil nail length to the excavation depth is greater than 2/3, the soil between piles can not form soil arching effect. In addition, when the ratio of pile spacing to pile diameter is in the range of 4~6 and the ratio of soil nail length to excavation depth is less than 2/3, the soil arching effect is obvious. Furthermore, for pit supporting structure with scattered row piles and soil nailing, the final form of soil arching effect is a curved surface, which along the top surface appears as parabolic and along the depth direction has a certain vertical depth.

Key words: geotechnical engineering, scattered row piles, soil nail wall, soil arching effect, centrifuge model test, three-dimensional finite element analysis

中图分类号: 

  • TU47

表1

土样的物理力学特性"

比重 含水量
/%		 密度
/(g?cm-3)		 固结不排水强度
黏聚力/kPa 内摩擦角/(°)
2.7 40 1.9 7 33.5

图1

模型桩示意图"

图2

模型土钉"

图3

土钉墙面层"

表2

离心机模型试验结果"

模型
编号		 桩间距
B/mm		 钉长L
/mm		 土钉水
平间距
Sh/mm		 土钉竖
向间距
Sv/mm		 最大离心
加速度
/(9.8 m·s-2)
1 120 66.7 20 40 60
2 120 100.0 20 40 80
3 120 133.3 20 40 90
4 120 200.0 20 40 120
5 80 66.7 20 40 80
6 160 66.7 20 40 50
7 120 66.7 20 20 80
8 120 66.7 40 20 40

图4

离心试验模型"

表3

加速度与原型尺寸关系"

加速度
/(9.8 m·s-2)		 边坡高度
H/m		 桩长L'/m 桩径D/m
1 0.20 0.40 0.02
10 2.00 4.00 0.2
20 4.00 8.00 0.4
30 6.00 12.00 0.6
40 8.00 16.00 0.8
50 10.00 20.00 1.0

图5

位移传感器布置图"

图6

摄像机动态监控系统"

图7

离心模型试验后基坑形态"

图8

计算模型简图"

图9

排桩承担的荷载"

表4

排桩计算宽度与桩径之比b/D"

模型
编号		 离心加速度
30g 40g 50g 60g 70g 80g 90g 100g 110g 120g
1 1.33 2.59 4.91 5.67 - - - - - -
2 1.20 2.30 3.81 4.45 5.50 5.69 - - - -
3 0.96 1.29 1.46 1.52 1.65 2.07 2.775 - - -
4 0.64 0.87 1.07 1.29 1.55 1.69 1.85 1.93 1.99 2.05
5 1.59 2.23 2.42 2.77 3.09 - - - - -
6 1.59 2.10 2.62 - - - - - - -
7 0.77 0.86 1.13 1.64 4.94 5.46 - - - -
8 2.76 3.38 - - - - - - - -

表5

有限元模型计算参数"

材料 弹性模量
/MPa		 泊松比 粘聚力
/kPa		 内摩擦角
/(°)		 容重
/(kN·m-3)
桩 70 000 0.2 - - 27
土体 30 0.35 7.5 33.7 19
土钉 210 000 0.2 - - 28
面板 7 000 0.2 - - 27

图10

有限元模型简图"

图11

地表沉降(模型试验5)"

图12

有限元模型的破坏形态"

图13

桩身内力及变形(模型试验5)"

图14

桩后土体水平位移(n=70g)"

图15

滑裂面及土拱形态(n=70g)"

图16

土拱形态"

表6

土拱参数"

参数 模型编号
1 2 3 4 5 6 7 8
拱高/mm 30 45 0 0 25 0 5 65
直立深度/mm 100 80 0 0 120 0 20 60

图17

桩间距对土拱形态的影响"

图18

土钉长度对土拱形态的影响"

图19

土钉间距对土拱形态的影响"

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