摘要
依托云南楚姚高速公路红层软岩高填方路堤工程,建立典型边坡断面模型,对路堤工后长期沉降进行数值模拟。结果表明:路面最大沉降和最大不均匀沉降随压实度的增大呈现出减小的趋势,随着含水率的增加呈现出“先减小后增大”的趋势。因此,适当增大填料的压实度,使用非饱和(最优含水率)状态的填料,可以较好地控制高填方路堤的长期沉降,达到规范要求的质量控制标准。同时,进行高填方区域堆载预压,完成路基早期工后沉降,可减少通车后的长期沉降。堆载高度的选择应综合考虑成本和效益,根据填方高度和现场条件,选择合适的堆载高度。
In relation to the red-bed soft rock high fill embankment engineering of Chuyao expressway in Yunnan,a typical slope section model is established to simulate the long-term settlement of the embankment after construction.The results show that the maximum settlement and uneven settlement of pavement decrease with the increase of compaction degree,and appear a trend of"first decrease and then increase"with the increase of moisture content.Therefore,the long-term settlement of high-filled embankment can be well controlled by properly increasing the compaction degree and using unsaturated(optimal moisture content)filling materials,which can meet the quality control standards required by the specification.Meanwhile,high-filled areas are preloaded to complete the early post-construction settlement of subgrade and reduce the long-term settlement after opening to traffic.The selection of stacking height should comprehensively consider the cost and benefits,and select the appropriate stacking height according to the filling height and site conditions.
作者
张华
张文勰
徐晨
徐金峰
曾维成
黄太阳
ZHANG Hua;ZHANG Wenxie;XU Chen;XU Jinfeng;ZENG Weicheng;HUANG Taiyang(Yunnan Chuyao Expressway Constructing Headquarters,Chuxiong 650228,Yunnan,China;Yunnan Communications Investment and Construction Group Co.,Ltd.,Kunming 650103,China;School of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《路基工程》
2022年第6期146-151,共6页
Subgrade Engineering
基金
国家重点研发计划(2019YFC0605100,2019YFC0605103)
云南省交通运输厅科技项目(云交科教便[2021]7号)
云南省交通运输厅科技项目(云交科教[2016]160号(四))。
关键词
高填方路堤
红层软岩填料
长期沉降
数值模拟
压实度
含水率
堆载预压
high-filled embankment
red-bed soft rock filler
long-term settlement
numerical simulation
degree of compaction
moisture content
preloading
