储煤场堆载对地基和煤棚桩基影响的离心模型试验研究

元光宗; 李建东

doi:10.11779/CJGE2024S10029

储煤场堆载对地基和煤棚桩基影响的离心模型试验研究 English Version

元光宗^{1, 2,},
李建东^1, ,

1.
交通运输部天津水运工程科学研究院港口水工建筑技术国家工程研究中心, 天津 300456
2.
天津大学建筑工程学院, 天津 300000

基金项目:

中央级公益性科研院所基本科研业务费专项资金项目 TKS20240401

详细信息

作者简介:
元光宗(1994—)，男，硕士，助理工程师，从事岩土工程土工离心机模型试验方面的研究工作。E-mail: yuanguangzong@163.com

通讯作者:
李建东，E-mail: jiandongli09@163.com

中图分类号: TU432
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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 influences of loads of a coal storage yard on foundation and pile-based coal shed

YUAN Guangzong^{1, 2,},
LI Jiandong^1, ,

1.
Tianjin Research Institute for Water Transport Engineering, M.O.T., National Engineering Laboratory for Port Hydraulic Construction Technology, Tianjin 300456, China
2.
School of Architectural Engineering, Tianjin University, Tianjin, 300000, China

摘要

摘要: 某大型储煤场位于沿海地带，建设初期通过真空堆载联合预压煤场软土地基进行了预处理。储煤场煤棚基础采用预应力高强度混凝土管桩(PHC桩)进行加固处理，并在其前方设置水泥搅拌桩(CDM桩)作为保护桩。为了研究煤场长期大面积堆载对地基和桩基煤棚产生的影响，开展土工离心机模型试验，模拟了煤场循环堆卸载和30 a长期堆载两种工况。实验结果对煤场地基的沉降进行了预测，通过对桩基础的受力分析，进一步对煤场进行安全性评估。
- 离心模型试验 /
- 软土地基 /
- 沉降 /
- 弯矩
Abstract: A large coal storage yard is located in the coastal zone, and the soft ground foundation of the coal yard is pre-treated by vacuum pile-loading joint pre-treatment at the early stage of construction. The coal shed of the coal storage yard is designed to be reinforced by the PHC group piles, and the CDM protection piles are set up in front of them. In order to study the influences of long-term large-scale pile loading on the foundation and pile-based coal shed, geotechnical centrifugal model tests are carried out to simulate the two working conditions of cyclic pile unloading and long-term pile loading for 30 years in the coal yard. The test results predict the settlement of the foundation of the coal yard, and further evaluated the safety of the coal yard by analyzing the stress of the pile foundation.
- centrifugal model test /
- soft ground /
- settlement /
- bending moment

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图 1 TK-C500型土工离心机

Figure 1. TK-C500 geotechnical centrifuge

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图 2 试验模型示意图

Figure 2. Schematic diagram of test model

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图 3 PHC桩和CDM桩

Figure 3. PHC and CDM piles

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图 4 试验模型布置图

Figure 4. Layout of test model

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图 5 循环期地基表层t-S曲线

Figure 5. t-S curves of foundation during cyclic loading period

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图 6 恒载期地基表层t-S曲线

Figure 6. t-S curves of foundation during constant loading period

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图 7 循环期承台t-S曲线

Figure 7. t-S curves of bearing platform during cyclic loading period

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图 8 恒载期承台t-S曲线

Figure 8. t-S curves of bearing platform during constant loading period

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图 9 ^#1桩桩身弯矩曲线图

Figure 9. Curves of bending moment of pile 1

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图 10 ^#2桩桩身弯矩曲线图

Figure 10. Curves of bending moment of pile 2

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图 11 CDM桩桩身剪力曲线图

Figure 11. Curves of shearing force of CDM piles

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表 1 土工离心机试验相似比尺

Table 1 Scaling laws of centrifugal model tests

加速度	长度/位移	密度	质量	应力	应变	抗弯刚度	均布荷载
N	N	1	1/N³	1	1	1/N⁴	1

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表 2 土层参数

Table 2 Parameters of soils

土层	厚度/mm	质量密度/(g·cm^-3)	天然含水率/w	内摩擦角/(°)	压缩模量/MPa
粉质黏土	78	1.80	20.0	25	5.5
淤泥质黏土	53	—	35.8	—	—
砂土	44	1.90	27.0	25	2.3
淤泥质黏土	216	—	39.3	—	—
砂土	161	1.95	23.0	27	14
黏土	28	1.92	30.0	—	16
砂土	58	1.95	25.0	29	21
黏土	36	1.92	30.0	—	16
砂土	223	1.95	25.0	29	21

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