摘要
应用一个新的模型分析了几个扩展基础载荷试验,着重揭示前人无法解释的土体的蠕变行为。发现:使用的模型能够表征扩展基础载荷试验下土体的蠕变行为,且经模型变换后的应变时间曲线在双对数轴上是一条直线,其斜率为模型的指数n值,且n的取值与模型的参考量无关;载荷试验下土体蠕变行为的原始数据受到木制反力梁的自重蠕变、卸载-再加载、不等的蠕变观察时间等三个因素的干扰,当剔除这些干扰后得到的n值荷载水平曲线,显示n值与应力水平无关,n可以被看作表征土体的蠕变特性的一个指标。
A new model is applied to analyze load tests on several spread footings to reveal its creep behavior,which confused previous researchers. In total the following findings are drawn： the model is able to describe the creep behavior during load tests on spread footings,and strain-time curves will be straight lines when plotted in loglog scales with the slope as the exponent in the model,while the value of n is nothing to do with references in the model; raw data for creep behavior from load tests are mixed with noise from creep of wood reaction beam because of self-weight,unload-reload and unequal duration for creep at different load levels,when all three factors are removed and / or corrected,it is clear shown from n value-load levels curves that n is not related to load levels,so it is reasonable to take n as a soil property for creep behavior.
出处
《科学技术与工程》
北大核心
2016年第26期245-250,263,共7页
Science Technology and Engineering
基金
南宁市科学研究与技术开发科技攻关计划(ZS20150051)资助
