基于临界状态理论的海相含细粒土砂液化特性试验研究

蔡世兴; 唐译; 关云飞

doi:10.11779/CJGE2023S10026

基于临界状态理论的海相含细粒土砂液化特性试验研究 English Version

南京水利科学研究院岩土工程研究所, 江苏南京 210024

基金项目:

国家重点研发计划项目 2021YFB2600700

详细信息

作者简介:
蔡世兴(1996—)，男，陕西商洛人，主要从事土动力学等方便的研究。E-mail: caisx2414@163.com

通讯作者:
唐译, E-mail: ytang@nhri.cn

中图分类号: TU441
计量
- 文章访问数: 171
- HTML全文浏览量: 28
- PDF下载量: 52
出版历程
- 收稿日期: 2023-07-05
- 网络出版日期: 2023-11-23
- 刊出日期: 2023-10-31

Experimental study on liquefaction characteristics of marine fine-grained sand based on critical state theory

Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China

摘要

摘要: 采用饱和海相含细粒土砂开展固结不排水三轴剪切试验和轴向-扭转耦合循环剪切试验，基于临界状态理论，研究砂土状态参数与其液化特性的关系。研究结果表明：对于海相含细粒土砂，其临界孔隙比和归一化有效平均正应力具有很高的线性相关性；轴向-扭转耦合不排水循环剪切试验结果显示，循环应力比CRR相同时，状态参数ψ越大，液化振次N_L越小，根据研究结果提出砂土液化振次N_L的计算公式，N_L与ψ很好的满足指数函数关系。
- 含细粒土砂 /
- 轴向-扭转耦合循环剪切试验 /
- 临界状态 /
- 液化 /
- 循环应力比
Abstract: The consolidated undrained triaxial shear tests and coupled axial-torsional cyclic shear tests are conducted using the marine fine-grained sand to study the correlation between the critical state parameter and the liquefaction characteristics based on the critical state theory. The tests results show a linear correlation between the critical void ratio and the normalized effective normal stress. The results of the coupled axial-torsional cyclic shear tests show that the cycle number for liquefaction, N_L, decreases with the increasing state parameter, ψ, for a certain cyclic resistance ratio. Finally, an exponential function for expressing the relationship between N_L and ψ is proposed.
- fine-grained sand /
- coupled axial-torsional cyclic shear test /
- critical state /
- liquefaction /
- cyclic resistance ratio

HTML全文

图 1 空心圆柱试样的应力状态

Figure 1. Stress states of hollow cylinder sample

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图 2 土样颗粒级配曲线

Figure 2. Grain-size distribution curve

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海相含细粒土砂在e-( ${p'_{}}/{p_{\text{a}}}$ )^ξ平面内的临界状态线

CSL of marine fine-grained sand on e-( ${p'_{}}/{p_{\text{a}}}$ )^ξ plane

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图 4 砂土典型循环扭剪试验结果

Figure 4. Results of typical hollow cylinder torsional shear tests

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图 5 液化循环次数N_L与状态参数ψ关系曲线

Figure 5. Curves of N_L and ψ

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表 1 三轴试验参数

Table 1 Triaxial test parameters

试验编号	初始有效平均应力 ${p'_0}$	固结后e_cs	临界状态有效平均应力 ${P'_{{\text{cs}}}}$
CU1	100	1.051	124
CU2	100	0.980	325
CU3	200	0.964	438
CU4	400	0.942	580

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表 2 空心圆柱循环扭剪试验参数

Table 2 Parameters of hollow cylinder torsional tests

试验编号	${p'_{\text{0}}}$	固结后e_cs	τ_d	CRR	N_L	ψ
HCA1	100	0.984	7.5	0.106	40	-0.166
HCA2	100	0.988	10.0	0.141	14	-0.163
HCA3	100	0.994	12.5	0.177	3	-0.162
HCA4	200	0.969	15.0	0.106	98	-0.215
HCA5	200	0.978	20.0	0.141	25	-0.206
HCA6	200	0.975	25.0	0.177	5	-0.209
HCA7	300	0.958	22.5	0.106	220	-0.258
HCA8	300	0.963	30.0	0.141	39	-0.254
HCA9	300	0.959	37.5	0.177	11	-0.258

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参考文献(12)

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[7]	JEFFERIES M, BEEN K. Soil liquefaction: a critical state approach[M]. Boca Raton: CRC press, 2015.
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[9]	PORCINO D D, TRIANTAFYLLIDIS T, WICHTMANN T, et al. Using different state parameters for characterizing undrained static and cyclic behavior of sand with non-plastic fines[J]. Soil Dynamics and Earthquake Engineering, 2022, 159: 107318. doi: 10.1016/j.soildyn.2022.107318
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