红层软岩高填方路堤工后沉降数值模拟  

Numerical Simulation of Post-construction Settlement of Red-bed Soft Rock High-filled Embankment

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)

机构地区：[1]云南楚姚高速公路建设指挥部,云南楚雄650228 [2]云南交投集团投资有限公司,昆明650103 [3]同济大学土木工程学院,上海200092

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))。

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.

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 

分 类 号：U416.12[交通运输工程—道路与铁道工程]