动载作用频率对海相沉积软土动态流变特性影响试验研究

›› 2013, Vol. 34 ›› Issue (S1): 9-13.

动载作用频率对海相沉积软土动态流变特性影响试验研究

胡华，郑晓栩

厦门大学建筑与土木工程学院，福建厦门 361005

收稿日期:2013-04-20 出版日期:2013-08-30 发布日期:2014-06-09
作者简介:胡华，男，1968年生，博士，教授，主要从事岩土工程及减灾、地质环境与灾害防治等教学和科研工作
基金资助:
国家自然科学基金资助（No.51278437）；福建省自然科学基金资助项目（No.2011J01333）

Experimental research on dynamic rehelogical characteristics of marine deposit soft soil under different frequencies of dynamic loading

HU Hua，ZHENG Xiao-xu

College of Architecture & Civil Engineering, Xiamen University, Xiamen, Fujian 361005, China

Received:2013-04-20 Online:2013-08-30 Published:2014-06-09

摘要/Abstract

摘要： 动态载荷作用下软弱岩土加速流变，引发更多的岩土工程事故和地质灾害。采集厦门海相沉积软土，采用人工重塑试样，在动态三轴仪上测试正弦荷载作用及不同频率条件下试样流变过程的动应力-应变、流变过程动应变-时间、流变应变等动态流变力学特性，对比分析了动载作用频率对海相沉积软土动态流变特性影响。试验测试分析表明：软土的动态流变特性对低频动载作用更敏感，流变效应更明显，而在高频动载作用下流变敏感性差，流变变形缓慢。研究结论为探索动载作用频率对软弱岩土动态流变力学特性影响，揭示动载作用诱发重大岩土地质灾害的流变动力学机制等具有一定的理论和现实意义。

关键词: 动态荷载, 动载频率, 海相沉积软土, 动态流变特性

Abstract: The rheological action of the soft rock-soil could be accelerated by the dynamic loading, which induces more geotechnical engineering accidents and geologic disasters. The samples of marine deposit soft soil are collected in Xiamen, and the dynamic rheological characteristics of dynamic stress-strain, rheological strain-time and rheological displacement are tested under the different frequencies of dynamic loading of sinusoidal variation using dynamic-triaxial device and remodeled samples. The influence on rheological characteristics of marine deposit soft soil is analyzed under different frequencies of dynamic loading. The experimental analysis indicates that when the frequency of dynamic loading is low, the rheological dynamic characteristics sensitivity of marine deposit soft soil is obvious, and the rheological distortion is quick. But when the frequency of dynamic loading is high, the rheologic dynamic characteristics sensitivity of marine deposit soft soil is not obvious, and the rheologic distortion is slow. The research results have theoretical and actual significance for us to open out the dynamic rheological characteristics and the rheologic dynamic mechanism of bursting out geologic disaster under dynamic loading with different frequencies.

Key words: dynamic loading, frequency of dynamic loading, marine deposit soft soil, dynamic rheological characteristics

中图分类号:

TU 447

胡华，郑晓栩. 动载作用频率对海相沉积软土动态流变特性影响试验研究[J]. , 2013, 34(S1): 9-13.

HU Hua，ZHENG Xiao-xu. Experimental research on dynamic rehelogical characteristics of marine deposit soft soil under different frequencies of dynamic loading[J]. , 2013, 34(S1): 9-13.

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