长江科学院院报2017，Vol.34Issue(2)：1-4,16,5.DOI:10.11988/ckyyb.20161064
低荷载水平下土工格栅加速蠕变试验
Accelerated Creep Tests of Geogrids under Small Load Level
摘要
Abstract
Generally it takes a long period of time to complete conventional creep tests on geosynthetic materials. The test environment such as temperature and humidity should also be exactly controlled,which makes such tests very expensive and time consuming.Moreover,conventional creep test cannot predict the creep characteristics in design life.In view of this,the accelerated creep test method of short-term time-temperature superposition has been proposed.In this article,according to the principle of short-term time-temperature superposition,three groups of short-term creep tests of high-density polyethylene(HDPE)geogrids at 10%,20%and 30%load levels were con-ducted by three-axis electronic creep testing machine.Through the indoor creep tests,the long-term creep character-istics of the HDPE geogrids at each small load level were predicted.Results show that the long-term creep strain of the geogrids at 10%,20%and 30%load levels were low and the values at 10%load level maintained within 2%;the short-term time-temperature superposition principle takes relatively short time to predict the long-term creep strain and stiffness values of HDPE geogrids.This study could be used as reference for engineering application.关键词
土工格栅/加速蠕变/低荷载水平/时温叠加法/长期蠕变特性Key words
geogrid/accelerated creep/small load level/time-temperature superposition/long-term creep property分类
建筑与水利引用本文复制引用
向前勇,刘华北,汪磊,张垭..低荷载水平下土工格栅加速蠕变试验[J].长江科学院院报,2017,34(2):1-4,16,5.基金项目
国家自然科学基金项目 （）
