循环荷载下粉土液化流动特性拖球试验研究

刘涛; 张美鑫; 崔逢

循环荷载下粉土液化流动特性拖球试验研究

山东省海洋环境地质工程重点实验室, 山东青岛 266100;海洋环境与生态教育部重点实验室, 山东青岛 266100

基金项目: 国家自然科学基金（41672272，41427803）；中央高校基本科研业务费专项资助项目（201564017）。

计量
- 文章访问数: 904
- HTML全文浏览量: 17
- PDF下载量: 694
- 被引次数: 0
出版历程
- 收稿日期: 2016-05-23

Dragging ball test on flow characteristics of liquefied silt under cyclic loading

Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Qingdao 266100, China;Key Laboratory of Ocean Environment and Ecology, Ministry of Education, Qingdao 266100, China

摘要

摘要: 基于流体力学中的Stokes黏滞阻力理论，以振动台试验为基础，开发了一套测量液化过程中粉土流变特性的拖球试验装置。在铺有粉土海床的模型箱内埋设光滑小球，通过测量小球水平运动过程中所受阻力值的大小，计算粉土液化的表观动力黏度，分析粉土液化过程中的表观动力黏度与超孔压比之间的关系，以及液化后表观黏度与应变率的变化规律。试验结果表明，振动台试验下，孔隙压力表现为迅速上升，粉土迅速达到液化状态；振动过程对海床固结影响较大；粉土海床在未达到完全液化状态时（ru<1），表观黏度随超孔压比增大而减小，在液化状态下（ru=1），剪应力随应变率增大而减小，粉土呈现出剪切稀化的特点，为典型的非牛顿流体特征。
- 粉质土 /
- 液化 /
- 流动特性 /
- 拖球试验 /
- 振动台试验
Abstract: According to the theory of Stokes Law, the test apparatus of flow characteristics of liquefied silt is developed based on the shaking table tests. A steel sphere, embedded in the test box, can be moved in the horizontal direction when the silt liquefaction occurs. Resistance force and velocity of the steel sphere are measured during sphere dragging, then apparent viscosity can be evaluated. Analysis the relationship between apparent viscosity and excess pore pressure ratio during silty liquefaction. The change of apparent viscosity and strain rate after silty liquefaction is researched. The result shows that, during the shaking table test, the pore pressure showed a rapid increase, and silt quickly reached a liquefied state; there was consolidation phenomenon in the soil bed, and vibration had a great influence on consolidation. Analysis found that, when the soil has not reached completely liquefied state (ru<1), the apparent viscosity decreases with increasing of excess pore pressure ratio; when it has reached liquefied state (ru=1), the shear stress decreases with increasing of strain rate, the silt is shear thinning non-Newtonian fluid.
- silt /
- liquefaction /
- fluid /
- dragging ball test /
- shaking table test

HTML全文

参考文献(18)

Prior D B, Suhayda J N, Lu N Z, et al. Storm wave reactivation of a submarine landslide[J]. Nature, 1989, 341(7):47-50.

刘涛, 冯秀丽. 黄河水下三角洲低角度斜坡失稳模式探讨[C]//渤海湾油气田勘探开发技术论文集. 北京:中国石化出版社, 2010(7):72-78. Liu Tao, Feng Xiuli. Slope failure mode of low angle on Yellow River Delta[C]//Bohai Bay Oil and Field Exploration and Development Technology Proceedings. Beijing:China Petrochemical Press, 2010(7):72-78.

Pratson L F, Imran J, Hutton E, et al. Lagrangian model of subaqueous turbid surges[J]. Computers & Geosciences, 2008, 27:701-716

孙永福, 董立峰, 宋玉鹏. 黄河水下三角洲粉质土扰动土层特征及成因探析[J]. 岩土力学, 2008, 29(6):1494-1499. Sun Yongfu, Dong Lifeng, Song Yupeng. Analysis of characteristics and formation of disturbed soil on subaqueous delta of Yellow River[J]. Rock and Soil Mechanics, 2008, 29(6):1494-1499.

王良民, 叶剑红, 朱长歧. 近海欠密实砂质海床内波致渐进液化特征研究[J]. 岩土力学, 2015, 12(36):3583-3588. Wang Liangmin, Ye Jianhong, Zhu Changqi. Investigation on the wave-induced progressive liquefaction of offshore loosely deposited sandy seabed[J]. Rock and Soil Mechanics, 2015, 12(36):3583-3588.

Sasaki Y, Towhata I, Tokida K I, et al. Mechanism of permanent displacement of ground caused by seismic liquefaction[J]. Soils and Foundations, 1992, 32(3):79-96.

Hamada M, Wakamatsu K. A study on ground displacement caused by soil liquefaction[J]. Journal of Geotechnical Engineering, 1998, 43:189-208.

Uzuoka R, Yashima A, Kawakami T, et al. Fluid dynamics based prediction of liquefaction induced lateral spreading[J]. Computers and Geotechnics, 1998, 22(3):243-282.

刘汉龙, 陈育民. 砂土液化后流动特性分析[C]//第一届全国岩土本构理论研讨会论文集. 北京:北京航空航天大学出版社, 2008. Liu Hanlong, Chen Yumin. Analysis on flow characteristics of dynamic tests on post liquefied sand[C]//Symposium of the First National Geomaterial Seminar. Beijing:Beihang University Press, 2008.

陈育民, 刘汉龙, 邵建国, 等. 砂土液化及液化后流动特性试验研究[J]. 岩土工程学报, 2009, 31(9):1408-1413. Chen Yumin, Liu Hanlong, Shao Jianguo, et al. Laboratory tests on flow characteristics of liquefied and post-liquefied sand[J]. Rock and Soil Mechanics, 2009, 31(9):1408-1413.

陈育民, 高星, 刘汉龙. 砂土液化流动变形的简化方法[J]. 岩土力学, 2013(6):1567-1573. Chen Yumin, Gao Xing, Liu Hanlong. Simplified method of flow deformation induced by liquefied sand[J]. Rock and Soil Mechanics, 2013(6):1567-1573.

刘涛, 崔逢, 张美鑫. 波浪作用下液化粉土流动特性拖球试验研究[J]. 海洋学报, 2016, 38(3):123-130. Liu Tao, Cui Feng, Zhang Meixin. Dragging ball test on flow characteristics of liquefied silt under wave loading[J]. Haiyang Xuebao, 2016, 38(3):123-130.

Ye Jianhong, Wang Gang. Seismic dynamics of offshore breakwater on liquefiable seabed foundation[J]. Soil Dynamics and Earthquake Engineering, 2015, 76:86-99.

Ye Jianhong, Wang Gang. Numerical simulation of seismic liquefaction mechanism in Quaternary loose seabed[J]. Bulletin of Engineering Geology and the Environment, 2016, 75:1183-1197.

Vanneste M, Sultan N, Sebastian Garziglia, et al. Seafloor instabilities and sediment deformation processes:The need for integrated, multi-disciplinary investigations[J]. Marine Geology, 2014, 352:183-214.

杨少丽, 沈渭铨, 杨作升. 波浪作用下海底粉砂液化的机理分析[J]. 岩土工程学报, 1995, 17(4):28-37. Yang Shaoli, Shen Weiquan, Yang Zuosheng. The mechanism analysis of seafloor silt liquefaction under wave loads[J]. Chinese Jounal of Geotechnical Engineering, 1995, 17(4):28-37.

Zen K, Yamazaki H. Mechanism of wave-induced liquefaction and densification in seabed[J]. Soils and Foundations, 1990, 30(4):90-104.

Jeng Dongsheng. Wave-induced seabed instability in front of a break water[D]. Perth:The University of Western Australia, 1997.

施引文献

资源附件(0)

访问统计

点击查看大图

计量

文章访问数: 904
HTML全文浏览量: 17
PDF下载量: 694
被引次数: 0

姓名
邮箱
手机号码
标题
留言内容
验证码

留言板