[1]杨爱武,仲涛,张国军,等.循环荷载作用下结构性软黏土动力特性试验研究[J].地震工程与工程振动,2018,(01):044-50.[doi:10.13197/j.eeev.2018.01.44.yangaw.006]
 YANG Aiwu,ZHONG Tao,ZHANG Guojun,et al.Experimental study on dynamic behavior of structural soft clay under cyclic loading[J].EARTHQUAKE ENGINEERING AND ENGINEERING DYNAMICS,2018,(01):044-50.[doi:10.13197/j.eeev.2018.01.44.yangaw.006]
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循环荷载作用下结构性软黏土动力特性试验研究
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《地震工程与工程振动》[ISSN:/CN:]

卷:
期数:
2018年01期
页码:
044-50
栏目:
论文
出版日期:
2018-06-30

文章信息/Info

Title:
Experimental study on dynamic behavior of structural soft clay under cyclic loading
作者:
杨爱武12 仲涛12 张国军12 赵梦生12
1. 天津城建大学 土木工程学院, 天津 300384;
2. 天津市软土特性与工程环境重点实验室, 天津 300381
Author(s):
YANG Aiwu12 ZHONG Tao12 ZHANG Guojun12 ZHAO Mengsheng12
1. Tianjin University of Urban Construction, Civil Engineering School of Tianjin, Tianjin 300384, China;
2. Key Laboratory of Soft Clay Engineering Character and Engineering Environment of Tianjin, Tianjin 300381, China
关键词:
结构性软土循环动荷载长期变形抗剪强度
Keywords:
structural soft claycyclic dynamic loadinglong-term deformationshear strength
分类号:
TU411.7
DOI:
10.13197/j.eeev.2018.01.44.yangaw.006
摘要:
循环荷载作用下软土力学参数呈现衰减劣化的趋势。本文以天津滨海海积软土为研究对象,通过GCTS空心圆柱扭剪仪进行不同波形与幅值动力循环试验,在达到规定振次后停止试验,利用微型十字板测试其抗剪强度,根据典型的动应力-应变滞回曲线确定动压缩模量、阻尼比与动应变的关系。试验结果表明:循环荷载作用下,累积变形量、抗剪强度、动压缩模量、阻尼比演化与波形和幅值有关。幅值相同时,方波产生的累积变形量明显大于正弦波。低幅值时,抗剪强度基本上表现为随振次增加先下降明显,后趋于稳定,与变形一致,属于稳定型;临界应力幅值时,随着振次增加,开始强度下降幅度大,之后下降速率变小,但不趋于稳定。动压缩模量变化趋势与十字板强度演化规律一致,阻尼比变化特征与十字板强度变化呈相反的趋势。
Abstract:
The mechanical parameters of soft clay under cyclic loading present the trend of degradation. The marine?soft?clay of Tianjin Binhai is taken as the research object in this paper. Dynamic cycling test with different wave patterns and amplitudes was carried out by hollow cylinder torsional apparatus (GCTS) and stopped after reaching the specified vibration times. The miniature vane shear tester was used to test the shear strength. According to the typical dynamic stress-strain hysteretic curve, the relationship between dynamic compression modulus, damping ratio and dynamic strain was determined. The results show that cumulative deformation, shear strength, dynamic compression modulus and damping ratio are related to the waveform and amplitude under cyclic loading. Under the same amplitude, the cumulative deformation of square wave is greater than that of sine wave. With the increase of the vibration times, the shear strength decrease first and then become stable under the low amplitude. It is consistent with the deformation and belongs to stable type. When close to the critical stress amplitude, the shear strength decrease obviously in the start and then decrease slowly with the increase of vibration times, but it does not tend to be stable. The change trend of dynamic compression modulus is accord with the evolution law of vane shear strength, but the variation of damping ratio and vane strength is contrary.

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备注/Memo

备注/Memo:
收稿日期:2016-11-10;改回日期:2017-05-07。
基金项目:国家自然科学基金项目(41372291);天津市科技计划项目(15JCZDJC40600,15ZCZDSF00220)
作者简介:杨爱武(1971-),男,教授,博士,主要从事软黏土力学特性及土体微观结构研究.E-mail:Tulilab@163.com
更新日期/Last Update: 1900-01-01