波浪荷载作用下防波堤地基土动强度试验研究

李治朋; 李一良; 张宇亭

doi:10.11779/CJGE2024S10027

波浪荷载作用下防波堤地基土动强度试验研究 English Version

李治朋^{1, 2,},
李一良^3, ,,
张宇亭²

1.
天津水运工程勘察设计院有限公司天津市水运工程测绘技术重点实验室, 天津 300456
2.
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
3.
河南省地质研究院, 河南郑州 450001

基金项目:

天津市科技计划项目 23YDPYCG00010

国家自然科学基金面上项目 41572297

详细信息

作者简介:
李治朋(1984—)，男，硕士，高级工程师，主要从事岩土工程方面的测试与研究工作。E-mail: 275923996@qq.com

通讯作者:
李一良, E-mail: 18695821097@qq.com

中图分类号: TU411
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出版历程
- 收稿日期: 2024-04-27
- 刊出日期: 2024-07-31

Experimental study on dynamic strength of breakwater foundation under wave loads

1.
Tianjin Survey and Design Institute for Water Transport Engineering Co., Ltd., Tianjin Key Laboratory of Surveying and Mapping for Waterway Transport Engineering, Tianjin 300456, China
2.
Tianjin Research Institute for Water Transport Engineering, M.O.T., National Engineering Laboratory for Port Hydraulic Construction Technology, Tianjin 300456, China
3.
Henan Academy of Geology, Zhengzhou 450001, China

摘要

摘要: 通过模拟波浪荷载，对防波堤地基土做了等压固结不排水动三轴剪切试验，分析得出，循环剪应力比与破坏振次可用幂函数拟合，但拟合参数不是常数，与土类和围压有关；土体在剪切过程中孔隙水压力会不断增加，但始终没有达到初始的围压数值，达到破坏标准时，约为初始围压的60%~80%；动孔压比与振次比关系可用幂函数很好地拟合，拟合参数不是常数，与土性有关；3种土的动应变发展模式不同，粉质黏土的压应变一直大于拉应变，粉土是压应变与拉应变基本同时发展，砂土则在开始一段时间，轴向应变很小，压应变小于拉应变，中后期，轴向应变迅速增长，压应变逐渐超过了拉应变。
- 波浪荷载 /
- 动三轴试验 /
- 动强度 /
- 振次 /
- 孔隙水压力 /
- 应变
Abstract: By simulating wave loads, the dynamic triaxial shear tests foundation soils of on breakwaters under isobaric consolidation and undrained flow are carried out. The analysis shows that the cyclic shear stress ratio can be fitted by the power function with failure frequency, but the fitting parameters are not constant. The pore water pressure of soils will increase continuously in the course of shear, but it does not reach the initial value of confining pressure. When it reaches the failure standard, it is about 60%~80% of the initial confining pressure. The relationship between the dynamic pore pressure ratio and the vibration frequency ratio can be well fitted by the power function, and the fitting parameters are not constant, which are related to soil properties. At the beginning, the axial strain is very small, and the compressive strain is less than the tensile strain. At the middle and later stages, the axial strain increases rapidly, and the compressive strain gradually exceeds the tensile strain.
- wave load /
- dynamic triaxial test /
- dynamic strength /
- vibration /
- pore water pressure /
- strain

HTML全文

图 1 CSR与N_f关系曲线( ${\sigma _3}$ =50 kPa)

Figure 1. Relationship between CSR and N_f ( ${\sigma _3}$ =50 kPa)

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图 2 CSR与N_f关系曲线( ${\sigma _3}$ =100 kPa)

Figure 2. Relationship between CSR and N_f ( ${\sigma _3}$ =100 kPa)

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图 3 CSR与N_f关系曲线( ${\sigma _3}$ =200 kPa)

Figure 3. Relationship between CSR and N_f ( ${\sigma _3}$ =200 kPa)

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图 4 粉质黏土的动孔压比与振次比拟合关系

Figure 4. Fitting relationship between dynamic pore water pressure ratio and vibration frequency ratio of silty clay

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图 5 粉土的动孔压比与振次比拟合关系

Figure 5. Fitting relationship between dynamic pore water pressure ratio and vibration frequency ratio of silt

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图 6 粉砂的动孔压比与振次比拟合关系

Figure 6. Fitting relationship between dynamic pore water pressure.ratio and vibration frequency ratio of silty sand

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图 7 粉质黏土在剪切过程中动应变时程曲线

Figure 7. Time-history curves of dynamic strain of silty clay

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图 8 粉土在剪切过程中动应变时程曲线

Figure 8. Time-history curves of dynamic strain of silt

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图 9 粉砂在剪切过程中动应变时程曲线

Figure 9. Time-history curves of dynamic strain of silty sand

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表 1 土样的物理性质

Table 1 Physical property indexes of soil samples

土类	含水率/%	密度/(g·cm^-3)	液限/%	塑限/%	塑性指数	液性指数
粉质黏土	29.6	1.86	30.8	17.6	13.2	0.91
粉土	25.8	1.91	26.5	14.0	8.5	1.39
粉砂	21.3	1.97	—	—	—	—

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表 2 DDS-70型动三轴仪技术参数

Table 2 Technical parameters of dynamic triaxial instrument

最大动轴力/N	侧向压力/MPa	反压/MPa	频率/Hz	最大轴向位移/mm
1370	0~0.6	0~0.3	≤10	20

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表 3 不同土类的拟合参数

Table 3 Fitting parameters of different soil types

土类	拟合参数a	拟合参数b	相关系数R
粉质黏土粉土粉砂	0.855 0.825 0.727	0.598 0.391 0.440	0.955 0.980 0.942

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参考文献(10)

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[3]	孟凡丽, 卢成原, 王姗姗. 波浪荷载下粉质土动应变和动强度的试验研究[J]. 浙江工业大学学报, 2007, 35(6): 671-674. doi: 10.3969/j.issn.1006-4303.2007.06.019 MENG Fanli, LU Chengyuan, WANG Sansan. Experimental study on dynamic strain and strength of silt under wave load[J]. Journal of Zhejiang University of Technology, 2007, 35(6): 671-674. (in Chinese) doi: 10.3969/j.issn.1006-4303.2007.06.019
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文章访问数: 87
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波浪荷载作用下防波堤地基土动强度试验研究 English Version

作者简介: 李治朋(1984—)，男，硕士，高级工程师，主要从事岩土工程方面的测试与研究工作。E-mail: 275923996@qq.com

通讯作者: 李一良, E-mail: 18695821097@qq.com

计量

出版历程

Experimental study on dynamic strength of breakwater foundation under wave loads

计量

出版历程

目录

作者简介:
李治朋(1984—)，男，硕士，高级工程师，主要从事岩土工程方面的测试与研究工作。E-mail: 275923996@qq.com

通讯作者:
李一良, E-mail: 18695821097@qq.com