摘要
湿陷性是黄土的特殊工程性质,为研究试样厚度对室内测定黄土湿陷性指标的影响,对西安某地深1~20 m内不同深度采取的黄土,利用常规高压固结仪及改造的固结仪,进行了厚度分别为2 cm与8 cm试样的湿陷试验。对比分析各深度土层2 cm试样和8 cm试样的室内湿陷试验的结果,表明:土层湿陷性较弱或压力较小时,不同厚度试样所得的湿陷系数相差不大;土层湿陷性较强时,随着压力的增大,两者的差异越来越大,同一压力下8 cm试样所得的湿陷系数大于2 cm试样所得的值。黄土的湿陷性越强,试样厚度对试验所得湿陷性指标(湿陷系数、自重湿陷系数、湿陷起始压力)的影响越大,此结论为室内湿陷试验适当调整试样厚度提供了依据。
To study the influence of specimen thickness on the collapsibility indexes of loess,a series of collapsibility tests on loess specimens at different depths(from 1 m to 20 m)in a certain area of Xi'an were carried out using conventional high-pressure and modified consolidation apparatus,respectively.The results of indoor collapsibility tests on loess specimens with thickness of 2 cm and 8 cm were compared and analyzed.The conclusions showed that the collapsibility coefficients of specimens with different thickness are similar when the collapsibility of soil is weak or the pressure is small.The difference between two specimens is more and more obvious with the increase of pressure when the collapsibility of soil is strong,and the collapsibility coefficient of 8-cm specimen is much larger than that of 2-cm specimen under the same pressure.The stronger the collapsibility of loess,the greater the influence of specimen thickness on the collapsibility indexes(collapsibility coefficient,self-weight collapsibility coefficient,and initial collapsibility pressure).This conclusion can provide a basis for the adjustment of specimen thickness in indoor collapsibility test.
作者
王丽琴
刘鑫
王正
李仑
狄圣杰
李凯宇
WANG Liqin;LIU Xin;WANG Zheng;LI Lun;DI Shengjie;LI Kaiyu(State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, Shaanxi, China;School of Civil Engineering and Architecture, Xi'an University of Technology Xi'an 710048, Shaanxi, China;Power China Northwest Engineering Corporation Limited, Xi'an 710065, Shaanxi, China)
出处
《地震工程学报》
CSCD
北大核心
2021年第5期1190-1196,共7页
China Earthquake Engineering Journal
基金
西安理工大学省部共建西北旱区生态水利国家重点实验室项目(QNZX-2019-07)
陕西省教育厅科研计划项目(17JS089)。
关键词
土力学
黄土
试样厚度
湿陷性指标
soil mechanics
loess
specimen thickness
collapsibility index
