深厚软土路基沉降预测方法及工程应用  

Settlement Prediction Method and Engineering Application of Deep Soft Soil Subgrade

作　　者：刘智 唐昌意 问建学 王胜 马祖遥 LIU Zhi;TANG Chang-yi;WEN Jian-xue;WANG Sheng;MA Zu-yao(Zhuhai Institute of Urban Planning and Design,Zhuhai 519000,China;CCCC Highway Consultants Co.Ltd.,Beijing 100010,China)

机构地区：[1]珠海市规划设计研究院,珠海市519000 [2]中交公路规划设计院有限公司,北京市100010

出　　处：《公路》2022年第7期103-108,共6页Highway

摘　　要：深厚软土路基工后沉降偏大的问题普遍存在,工后沉降控制是软土路基处治设计的难点,以珠海高栏港已竣工的三虎大道二期市政道路为研究对象,开展了现场沉降监测,对常用软土路基工后沉降的预测方法和理论进行了归纳,采用5种沉降预测方法分别对控沉疏桩复合地基和真空联合超载预压处治路段进行了工后沉降预测,预测结果表明:工后沉降最大值分别为72.21 mm和65.70 mm,均小于规范要求的300 mm,说明软土路基处治方案是合理可行的;工后沉降预测值由大到小排序为:对数法>双曲线法>浅岗法≈指数法>星野法,对数法预测工后沉降更符合珠海深厚软土路基工程实际。The problem of excessive post-construction settlement of deep and soft soil subgrades is common, and post-construction settlement control is a difficult point in the design of soft soil subgrade treatment. Taking the completed Phase II municipal road of Sanhu Road in Gaolan Port of Zhuhai as the research object, the site settlement monitoring is carried out, and the commonly used post-construction settlement prediction methods and theories are concluded. Five kinds of settlement prediction methods are used to predict the post-construction settlement of the composite foundation of controlled subsidence and the section of vacuum combined overload preloading treatment respectively. The prediction results show that the maximum values of post-construction settlement are 72.21 mm and 65.70 mm, respectively, which are both less than 300 mm required by the specification, indicating that the treatment scheme of soft soil subgrade is reasonable and feasible. The order of the predicted value of post-construction settlement is logarithmic method > hyperbola method > shallow hilt method ≈ index method > star field method. The prediction of post-construction settlement by logarithmic method is more in line with the practice of deep soft subgrade project in Zhuhai.

关 键 词：深厚软土路基 沉降预测方法 工后沉降 双曲线法 对数法 

分 类 号：U416.1[交通运输工程—道路与铁道工程]