黄河三角洲粉土循环剪切特性的试验研究

›› 2008, Vol. 29 ›› Issue (12): 3211-3216.

黄河三角洲粉土循环剪切特性的试验研究

栾茂田^1，2，何杨^2，3，许成顺^2，4，张振东²，王忠涛²，郭莹²

1. 大连理工大学海岸和近海工程国家重点实验室，大连 116024；2. 大连理工大学土木水利学院岩土工程研究所，大连 116024； 3. 海洋石油工程股份有限公司设计公司，天津塘沽 300451；4. 北京工业大学城市与工程安全减灾省部共建教育部重点实验室，北京 100022

收稿日期:2006-08-17 出版日期:2008-12-10 发布日期:2013-08-11
作者简介:栾茂田，男，1962年生，博士，教授，博士生导师，主要从事岩土力学基本理论与数值分析、非线性土动力学理论与计算、海洋土力学理论与实验技术等方面的教学与科学研究工作
基金资助:
国家自然科学基金重点基金资助项目（No.50639010）；国家自然科学基金资助项目（No.50579006）。

Experimental study of cyclic shear behaviour of silty soils in Yellow River Delta

LUAN Mao-tian^{1, 2}, HE Yang^{2, 3}, XU Cheng-shun^{2, 4}, ZHANG Zhen-dong², WANG Zhong-tao², GUO-Ying²

1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China; 2. Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China; 3. Design Department of Subsea Pipeline, Engineering Company, Offshore Oil Engineering Co., Ltd., Tianjin 300451, China; 4. Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100022, China

Received:2006-08-17 Online:2008-12-10 Published:2013-08-11

摘要/Abstract

摘要： 利用土工静力-动力液压三轴-扭转多功能剪切仪，对黄河三角洲埕北海域原状粉土试样进行了循环三轴和循环扭剪试验，以此探讨了原状海底粉土的动力变形与强度特性，确定了最大动剪切模量及动力变形参数随剪应变的变化规律。基于循环三轴试验结果，建立了残余孔隙水压力发展变化规律的双曲线经验模式，对动强度关于循环次数的依赖性提出了经验关系，确定了有关试验参数及其关于固结应力比的依赖性。与循环三轴试验结果相对比，认为在土工抗震设计中采用循环三轴试验结果稍偏于保守。

关键词: 动力特性, 原状海洋粉土, 波浪荷载所引起的循环应力, 动力变形参数, 孔隙水压力, 动强度

Abstract: The soil static and dynamic universal triaxial and torsional shear apparatus was employed to perform both undrained cyclic triaxial tests and cyclic torsional tests for undisturbed silty soil samples. Based on the experimental test results, dynamic characteristics of both deformation and strength of undisturbed marine silty soil is investigated. The maximum dynamic shear modulus and the dependency of dynamic shear modulus and damping ratio on shear strain are defined through cyclic triaxial shear tests. An empirical pattern is established for residual pore water pressure generated during cyclic shear which is represented by a hyperbolic function with respect to the number of cycles of dynamic stress. And an empirical formula is developed to describe the cyclic strength with respect to the number of cycles. The related parameters involved in both patterns of pore water pressure and cyclic strength are determined by experimental tests; and their dependency on the consolidation stress ratio is clarified. The experimental data achieved from cyclic torsional shear tests are used to validate the results from the triaxial shear tests. It should be more conservative using the cyclic strength determined by triaxial shear tests in geotechnical earthquake design.

Key words: dynamic behaviour, undisturbed marine silty soil, wave-induced cyclic stress, dynamic deformation parameters, pore water pressure, cyclic strength

中图分类号:

TU 443

栾茂田，何杨，许成顺，张振东，王忠涛，郭莹 . 黄河三角洲粉土循环剪切特性的试验研究[J]. , 2008, 29(12): 3211-3216.

LUAN Mao-tian , HE Yang , XU Cheng-shun , ZHANG Zhen-dong , WANG Zhong-tao , GUO-Ying . Experimental study of cyclic shear behaviour of silty soils in Yellow River Delta[J]. , 2008, 29(12): 3211-3216.

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