超大堆载下桩网复合地基变形特性离心模型试验研究

张军杰; 顾行文; 任国峰; 周春儿; 王年香

doi:10.11779/CJGE2024S10048

超大堆载下桩网复合地基变形特性离心模型试验研究 English Version

张军杰^1,,
顾行文^{2, 3},
任国峰^{2, 3, ,},
周春儿⁴,
王年香^{2, 3}

1.
河南省核技术应用中心, 河南郑州 450000
2.
南京水利科学研究院岩土工程研究所, 江苏南京 210024
3.
水灾害防御全国重点实验室, 江苏南京 210029
4.
广东省航运规划设计院有限公司, 广东广州 510050

基金项目:

国家重点研发计划“交通基础设施”重点专项2023年度项目 2023YFB2604200

详细信息

作者简介:
张军杰(1973—)，陕西宝鸡人，大学本科，高级工程师，主要从事地质灾害治理、山水林田湖草地质环境治理及岩土工程勘察工作。E-mail: 445149227@qq.com

通讯作者:
任国峰, E-mail: gfren@nhri.cn

中图分类号: TU435
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出版历程
- 收稿日期: 2024-04-28
- 刊出日期: 2024-07-31

Centrifugal model tests on deformation characteristics of pile-net composite foundation under super-large loads

ZHANG Junjie^1,,
GU Xingwen^{2, 3},
REN Guofeng^{2, 3, ,},
ZHOU Chuner⁴,
WANG Nianxiang^{2, 3}

1.
Henan Nuclear Technology Application Center, Zhengzhou 450000, China
2.
Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China
3.
The National Key Laboratory of Water Disaster Prevention, Nanjing 210029, China
4.
Guangdong Province Planning & Design Institute for Water Transportation Co., Ltd., Guangzhou 510050, China

摘要

摘要: CFG桩网复合地基广泛应用于处理软土地基。采用土工离心模型试验研究某码头堆场超大荷载下CFG桩网复合地基的变形特性，试验模拟了地基、CFG桩、树根桩、加筋垫层、防尘网和轨道梁基础、矿石堆载等，分析了超大荷载作用下复合地基沉降、防尘网和轨道梁基础水平位移、地基剖面位移的变化规律。试验结果表明，复合地基的沉降速率在稳定控制标准之内，沉降量满足堆场使用要求，防尘网基础和轨道梁基础水平位移和沉降均很小，复合地基沉降分量远大于水平位移分量。CFG桩网复合地基在350 kPa荷载作用下是稳定安全的，达到了预期加固效果。
- CFG桩桩网复合地基 /
- 水平位移 /
- 沉降 /
- 超大荷载 /
- 离心模型试验
Abstract: The CFG pile-net composite foundation is widely used to reinforce soft soil foundation. The geotechnical centrifugal model tests are carried out to study the deformation characteristics of the CFG pile-net composite foundation under super to large loads in the storage yard of a wharf. The foundation, CFG piles, root piles, reinforced cushion, dust net foundation, track beam foundation and ore loads are simulated in the tests. The variation laws of surface settlement, horizontal displacement of track beam foundation and displacement of foundation profile of the composite foundation are analyzed under super-large loads. The settlement rate of the composite foundation is within the stability control standard, and the settlement meets the requirements of the storage yard. The horizontal displacement and settlement of the dust net foundation and the track beam foundation are small. The settlement component of composite foundation is much larger than the horizontal displacement one. The test results show that the CFG pile-net composite foundation is stable and safe under the load of 350 kPa, and the foundation reinforcement has achieved the expected effects.
- CFG pile-net composite foundation /
- horizontal displacement /
- settlement /
- super-large load /
- centrifugal model test

HTML全文

图 1 复合地基剖面图

Figure 1. Profile of composite foundation

下载: 全尺寸图片幻灯片

图 2 离心模型试验布置图

Figure 2. Layout of centrifugal model tests

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图 3 复合地基表面沉降过程线

Figure 3. Surface settlement-time curves of composite foundation

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图 4 复合地基表面沉降剖面图

Figure 4. Surface settlement profile of composite foundation

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图 5 防尘网和轨道梁基础水平位移过程线

Figure 5. Horizontal displacement-time curves of foundation

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图 6 复合地基试堆期45 d剖面位移矢量图

Figure 6. Vectors of section displacement of composite foundation for forty-five days

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图 7 复合地基两年责任期剖面位移矢量图

Figure 7. Vectors of sectional displacement of composite foundation for two years

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表 1 土的物理力学性质指标

Table 1 Physical and mechanical properties of soils

土名	厚度/m	含水率/%	密度/(g·cm^-3)	不排水强度/kPa
素填土①₂	2.03	32.0	1.91	25
淤泥质黏土②₁	6.70	50.8	1.72	31
粉质黏土③₄	5.20	31.0	1.92	41
中粗砂③₂	2.00		1.85
黏土④₁、④₂		42.3	1.77	51

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表 2 复合地基表面沉降特征值

Table 2 Surface settlements of composite foundation 单位：mm

测点		时间节点
测点		堆载期32 d	试堆期45 d	恒载365 d	两年责任期
沉降	Sa1	39	45	77	86
	Sa2	91	132	275	309
	Sa3	169	228	428	479
	Sa4	218	285	513	573
	Sa5	49	60	108	124

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表 3 防尘网和轨道梁基础水平位移特征值

Table 3 Horizontal displacements of foundation 单位: mm

测点		时间节点
测点		堆载期32 d	试堆期45 d	恒载365 d	两年责任期
水平位移	Db1	13	14	17	18
水平位移	Db5	32	36	57	61

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