硬质地层中偏压基坑支护结构受力特性研究

朱湘旭; 徐昭辰; 章定文; 武同东; 马飞鹏

doi:10.11779/CJGE2021S2040

硬质地层中偏压基坑支护结构受力特性研究 English Version

朱湘旭^1,,
徐昭辰^{2, 3, ,},
章定文^{2, 3},
武同东¹,
马飞鹏¹

1.
中建八局轨道交通建设有限公司,江苏　南京　210046
2.
东南大学交通学院,江苏　南京　211189
3.
道路交通工程国家级实验教学示范中心（东南大学）,江苏　南京　211189

详细信息

作者简介:
朱湘旭(1986— ),男,工程师,主要从事地下工程施工与新技术研究。E-mail: 3306642286@qq.com

通讯作者:
徐昭辰, E-mail: 220203211@seu.edu.cn

中图分类号: TU43
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出版历程
- 收稿日期: 2021-08-16
- 网络出版日期: 2022-12-05
- 刊出日期: 2021-10-31

Behaviors of supporting structures of asymmetrically loaded deep excavation in hard soil layer

1.
China Construction Eighth Engineering Division Rail Transit Construction Co., Ltd., Nanjing 210046, China
2.
School of Transportation, Southeast University, Nanjing 211189, China
3.
National Demonstration Center for Experimental Road and Traffic Engineering Education (Southeast University), Nanjing 211189, China

摘要

摘要: 依托宁句城际轨道句容站基坑工程,通过现场监测和数值模拟方法,探究了硬质地层中偏压荷载对基坑围护桩桩身水平位移和桩身弯矩的影响规律。结果表明：硬质地层中偏压基坑两侧围护桩均向基坑内侧变形,偏压荷载在增加偏压侧桩身位移的同时抑制非偏压侧的桩身位移；偏压侧围护桩的最大水平位移出现在桩顶处,其随偏压距离与开挖深度比值减小而成指数增加；偏压距离小于基坑开挖深度时,偏压荷载对偏压侧桩身变形影响显著；偏压荷载使偏压侧围护桩桩身峰值弯矩显著增加,但对非偏压侧桩身弯矩几乎无影响；偏压基坑设计应对偏压侧围护结构进行增强以控制工程风险。
- 偏压基坑 /
- 硬质地层 /
- 围护桩 /
- 水平位移 /
- 弯矩
Abstract: Based on the excavation at Jurong Station of Nanjing-Jurong Intercity Railroad, the stress and deformation characteristics of the supporting structures during the construction of the asymmetrically-loaded excavation in hard soil layer are investigated through the in-site monitoring and numerical simulation methods. The results show that the retaining piles of the asymmetrically-loaded excavation in the hard soil at both sides are deformed to the inner side of the excavation, and the asymmetrical-load increases the displacement of the loading-side piles meanwhile suppresses the displacement of the unloading-side piles. The maximum horizontal displacement of the piles at the loading-side appears at the pile top, which increases exponentially with the decrease of the ratio of the distance of load to the depth of the excavation. When the loading distance is less than the depth of the excavation, the load has a significant effect on the deformation of the loading-side piles. The existence of the load significantly increases the peak bending moment of the loading-side retaining piles, but has almost no effect on the bending moment of unloading-side piles. In order to control the risks of excavation, the retaining piles at the loading side of excavation in the hard soil should be enhanced.
- asymmetrically loaded excavation /
- hard soil layer /
- retaining pile /
- horizontal displacement /
- bending moment

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图 1 基坑支护剖面图

Figure 1. Sectional drawing of supporting structures for excavation

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图 2 围护桩水平位移实测曲线和模拟曲线

Figure 2. Monitoring and simulated horizontal displacements of retaining piles

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图 3 不同偏压荷载下的桩身侧向位移

Figure 3. Lateral displacements of piles with different loads

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图 4 不同偏压荷载下的桩身弯矩

Figure 4. Bending moments of piles with different loads

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图 5 不同偏压距离下的桩身侧向位移

Figure 5. Lateral displacements of piles with different distances

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图 6 偏压侧墙体最大水平位移与L/H关系

Figure 6. Maximum horizontal displacement versus L/H

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图 7 不同偏压距离下的桩身弯矩

Figure 7. Bending moments of piles with different distances

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表 1 土层计算参数

Table 1 Parameters of soil layers

土层	重度/(kN·m^-3)	泊松比	κ	$λ$	M
粉质黏土	10	0.29	0.0258	0.14	1.0
强风化粉砂质泥岩	30	0.23	0.0186	0.11	1.1
中风化凝灰角砾岩	60	0.20	0.0042	0.04	1.3
破碎凝灰角砾岩	30	0.19	0.0078	0.06	1.2

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表 2 支护结构计算参数

Table 2 Parameters of supporting structures

名称	材料	密度/(kg·m^-3)	泊松比	弹性模量/GPa
围护桩	C20+C35混凝土	2400	0.20	28.8
砼支撑	C35混凝土	2400	0.20	31.5
钢支撑	Q235	7850	0.28	210.0

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参考文献(6)

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