摘要
应用TLJ-2型土工离心试验机,采用停机加载法与变加速度加载法,研究了海南东环客运专线和胶济客运专线中等压缩性土地基的沉降特性,并与现场填筑试验结果进行了对比,分析了应用离心模型试验方法预测原型地基沉降的主要影响因素与预测精度。研究结果表明:采用2种离心模型试验方法所得地基沉降比现场填筑试验值大,且随着地基深度增大,沉降修正系数减小,沉降差异增大;在现场填筑试验中,地基表层6.0m范围内产生的沉降占地基总沉降的比例大于45%,而离心模型试验的比例小于20%;2种离心模型试验方法产生的地基沉降具有相似的沉降特性,路基填筑期完成的沉降占总沉降比例相同,均为88%,但采用停机加载法产生的地基沉降比变加速度法大1倍左右。可见,采用2种离心模型试验方法均较难预测原型中等压缩性土地基的沉降,但可进行定性分析。
Centrifuge-stopped loading method and acceleration-variable centrifuge-run loading method were carried out by using TLJ-2 geotechnical centrifuge, the settlement characteristics of medium compression soil foundations of Haidong High-speed Railway and Jiaoji High-speed Railway were researched and compared with that of field-filling tests, and the main factors influencing the precisions of predicting prototype foundation settlement with centrifuge tests were studied. Research result indicates that the settlements from centrifuge tests are larger than that from filling tests, and their correction factors decrease and the settlement differences increase with the increase of foundation depth. The settlements within 6.0 m from filling tests are more than 45% of total settlement, but the settlements from centrifuge tests are less than 20% of total settlement. The properties of the settlements from two centrifuge tests are similar, the settlements in subgrade filling are 88% of total settlements, but the settlement from the first method is about twice of that from the second method. Obviously, it is very hard to predict the foundation settlement of medium compression soil by using centrifuge tests, but the tests can be used for qualitative analysis. 4 tabs, 7 figs, 14 refs.
出处
《交通运输工程学报》
EI
CSCD
北大核心
2011年第6期17-23,30,共8页
Journal of Traffic and Transportation Engineering
基金
铁道部科技研究开发计划项目(2010G003-F)
关键词
中等压缩性土
地基沉降
路基填筑
离心模型试验
现场填筑试验
medium compression soil
foundation settlement
subgrade filling
centrifuge modeltest
field filling test
