DCM和碎石基床联合承载特性的离心模型试验研究

王雪奎; 岳长喜; 黄思杰

doi:10.11779/CJGE2024S10014

DCM和碎石基床联合承载特性的离心模型试验研究 English Version

王雪奎^{1, 2, 3, 4, 5,},
岳长喜^{1, 2, 3, 4, 5},
黄思杰⁶

1.
中交天津港湾工程研究院有限公司, 天津 300461
2.
港口岩土工程技术交通运输行业重点实验室, 天津 300461
3.
天津市港口岩土工程技术重点实验室, 天津 300461
4.
中交集团岩土工程重点实验室, 天津 300222
5.
中交第一航务工程局有限公司, 天津 300461
6.
华设检测科技有限公司, 江苏南京 210000

详细信息

作者简介:
王雪奎（1989—），男，硕士，工程师，主要从事土工离心模型试验方面的研究。E-mail: 454917485@qq.com

中图分类号: TU411
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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 combined bearing characteristics of DCM and gravel foundation

WANG Xuekui^{1, 2, 3, 4, 5,},
YUE Changxi^{1, 2, 3, 4, 5},
HUANG Sijie⁶

1.
Tianjin Port Engineering Institute Co., Ltd. of CCCC First Harbor Engineering Co., Ltd, Tianjin 300461, China
2.
Key Laboratory of Port Geotechnical Engineering, Ministry of Transport, PRC, Tianjin 300461, China
3.
Key Laboratory of Port Geotechnical Engineering of Tianjin, Tianjin 300461, China
4.
Key Laboratory of Geotechnical Engineering, CCCC, Tianjin 300222, China
5.
CCCC First Habor Engineering Co., Ltd., Tianjin 300461, China
6.
China Design Testing Technology CO., LTD, Nanjing 210000, China

摘要

摘要: DCM联合碎石基床是处理跨海沉管隧道复杂地质条件的新型地基形式，在软土地区极具优势。依托深中通道沉管隧道工程，通过离心模型试验，研究了DCM联合碎石基床的承载特性和激振荷载对DCM桩身完整性的影响，研究结果表明：复合地基荷载-沉降曲线存在拐点，拐点前荷载和沉降呈线性关系，拐点后呈陡降型；碎石基床能够有效分散应力，提高地基的整体承载力；复合地基的极限承载力约是沉管底部最大荷载的1.5倍；当上部荷载超过地基极限承载力后，碎石会刺入DCM桩体内，引起桩头破碎，影响范围约为桩头以下3 m内；地基表面沉降较小，工后沉降占总沉降的15.5%，该新型地基形式能够有效控制沉降。
- DCM /
- 复合地基 /
- 碎石基床 /
- 承载特性
Abstract: The combination of DCM and gravel foundation is a new type of foundation form for dealing with complex geological conditions of cross sea immersed tube tunnels, which has extremely advantageous in soft soil areas. Based on the immersed tunnel project of Shenzhong-Zhongshan Bridge, centrifugal model tests are conducted to study the bearing characteristics of the DCM combined gravel foundation and the influences of excitation loads on the integrity of the DCM piles. The research results show that there is a turning point in the load-settlement curve of the composite foundation and a linear relationship between the load and the settlement before the turning point, and a steep drop after the turning point. The gravel foundation can effectively disperse stress and improve the overall bearing capacity of the foundation. The ultimate bearing capacity of the composite foundation is about 1.5 times the maximum load at the bottom of the immersed tube. When the upper load exceeds the ultimate bearing capacity of the foundation, the gravel will penetrate into the DCM piles, causing the pile head to break, with an impact range of about 3 m below the pile head. The surface settlement of the foundation is relatively small, and the post-construction settlement accounts for 15.5% of the total settlement. This new type of foundation form can effectively control settlement.
- DCM /
- composite foundation /
- gravel foundationt /
- bearing characteristic

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图 1 TPEI-200土工离心机

Figure 1. TPEI-200 geotechnical centrifuge

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图 2 模型水平布置图

Figure 2. Level drawings of centrifugal model

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图 3 模型剖面布置图

Figure 3. Sectional drawings of centrifugal model

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图 4 荷载沉降曲线

Figure 4. Relation curves between load and settlement

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图 5 桩头破坏情况

Figure 5. Damage situations at pile head

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图 6 桩上土压力过程曲线

Figure 6. Pressure-process curves of piles

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图 7 土中土压力过程曲线

Figure 7. Pressure-process curves of soils

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图 8 孔隙水压力过程曲线

Figure 8. Pore-water pressure process curves

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图 9 沉降曲线

Figure 9. Settlement curves

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表 1 地基土层的主要物理力学性质

Table 1 Main physical and mechanical properties of soil layers

土层	厚度 /m	含水率w/%	密度ρ/(g·cm^-3)	孔隙比 e	压缩模量E_s/MPa	压缩系数a_v/MPa^-1	内摩擦角φ/(°)	黏聚力c/kPa	弹性模量E/MPa	泊松比 $\nu$
碎石基床	0.8		2.00	1.000	17.55		40.0	0	14.63	0.25
淤泥	10.0	83.2	1.53	2.326	1.57	2.176	1.5	3.8	1.06	0.33
中砂	5.0	13.5	1.99	0.548	15.81	0.100	25.9	8.0	13.18	0.25
全风化花岗岩	6.5	16.3	1.96	0.652	18.00	0.097	27.4	18.5	15.00	0.25

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