疏排桩-土钉墙组合支护基坑土拱效应模型试验

doi:10.13229/j.cnki.jdxbgxb20170805

Abstract

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

CLC Number:

TU47

GU Hai-dong,LUO Chun-hong. Experiment on soil arching effect of pit supporting structure with scattered row piles and soil nail wall[J].Journal of Jilin University(Engineering and Technology Edition), 2018, 48(6): 1712-1724.

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References 20

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

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

模型编号	离心加速度
模型编号	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	-	-	-	-	-	-	-	-

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

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

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模型编号	桩间距 B/mm	钉长L /mm	土钉水平间距 S_h/mm	土钉竖向间距 S_v/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

参数	模型编号
参数	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