摘要
对上覆硬壳层软土夹层路基稳定性缺乏判定标准的问题,提出了填筑期与非填筑期分阶段研究模式.在填筑期内,通过监测数据与关键指标的比对,初步判断监控断面的稳定性状态;综合危险滑动圆弧的理论分析,以及塑性区开展和孔压消散的数值模拟结果,对监控断面的稳定性状态进行二次判断,改进规范法存在的不足,并制定出动态监控标准.在非填筑期内,借助构建的灰色预测模型获取最终沉降量,并以软弱下卧层压缩量与最终沉降量的比值作为评价因子,评判路基稳定性在非填筑期内的发展趋势.研究成果具有一定的理论指导意义和工程实用价值,可应用于高速公路路基的施工和监督环节.
As to the issue of a lack of standards in judging the stability of subgrade with soft substratum covering dry crust, the phased research pattern of filling stage and non-filling stage was proposed to address the problem. In the filling stage, the stability of monitoring section was preliminarily judged by the comparison between key index and monitoring data. Then through synthesizing the theoretical analysis of dangerous circular sliding surface and the numerical simulation result involving pore pressure dissipation and plastic zone extension, the stability of monitoring section was rejudged, the shortages existing in criterion method improved and a dynamic monitoring standard drawn up. In the non-filling stage, the grey prediction model was built to obtain total settlement, and the ratio of compressive deformation in soft substratum to total settlement serves as an evaluation factor to evaluate the developing trend of subgrade stability in this stage. The above-mentioned research achievements have certain theoretical guiding significance, as well as practical value in engineering, and could be applied to the construction and supervision of highway subgrade.
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2014年第2期305-313,共9页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目(51308486)
河北省科技支撑计划项目(12217650)
燕山大学博士基金项目(B712)
关键词
高速公路
硬壳层
边坡稳定性
数值模拟
变形预测
评价因子
highway
dry crust
slope stability
numerical simulation
deformation prediction
evaluation factor
