袋装砂井在公路软基处理中的应用与分析
摘要:以广东佛山某公路工程为依托，依据现场监测数据，分析了采用袋装砂井堆载预压法的软基段从堆载至恒载过程中，地表沉降、分层沉降、深层侧向位移和孔隙水压力的变化规律，并结合推算的工后沉降来评价该方法的处理效果。结果表明：在堆载至第210 d时，地表最大沉降量为291 mm，且地表最大沉降速率为8.67 mm/d，小于规范所限定的10 mm/d；软土分层沉降主要发生在深度2～6 m范围内的土层；而软土侧向水平位移主要发生在深度6 m以上的土层中，占到总位移量的约95%；在整个填土预压过程中综合孔压系数B最大值为0.371，小于规范限定的0.4；使用双曲线法对软土路基进行最终沉降及工后沉降推算，其工后沉降控制在34～64 mm之间，小于规范限定的200 mm。研究成果可为本区域公路软土地基的设计和施工提供依据。
Abstract:Based on a highway project in Foshan, Guangdong Province, the in-situ monitoring data with bagged sand well surcharge precompression method were aquired from heap load to dead load, and the variation of surface settlement, stratified settlement, deep lateral displacement and pore water pressure in the soft foundation section were analyzed. The treatment effect of this method combined with the calculated post-construction settlement was also evaluated. The results show that the maximum settlement of the surface is 291 mm when the soft foundation loaded by 210 days, and the maximum settlement rate of the surface is 8.67 mm/d, which is less than the 10 mm/d limited by the standard. The stratified settlement of soft soil mainly occurs in the soil layer with a depth of 2～6 m, and the lateral horizontal displacement of the soft soil mainly occurs in the soil layer with a depth of more than 6 m, accounting for about 95% of the total displacement. In the whole process of filling preloading, the maximum comprehensive pore pressure coefficient B is 0.371, which is smaller than the 0.4 limited by the standard. The final settlement and post-construction settlement of soft soil subgrade are calculated by hyperbolic method. The post-construction settlement is controlled between 34～64 mm, which is less than the 200 mm limited by the standard. The research results can provide the basis for the design and construction of highway soft soil foundation in this area.
中文标题：
袋装砂井在公路软基处理中的应用与分析
Application and Analysis of Bagged Sand Well in Soft Soil Foundation Treatment of Highway
作者：
何陆灏,刘红军,,刘克伦,何程铃,雷世旺
He Luhao,Liu Hongjun,,Liu Kelun,He Chengling,Lei Shiwang
作者简介:何陆灏，男，1995年生，汉族，广东广州人，硕士研究生，主要从事道路与桥梁工程设计。E-mail：289114109@qq.com通讯作者:刘红军，教授，博士，硕士生导师，研究方向为岩土工程与道路工程。E-mail：liuhongjun_0821@163.com
通讯地址：
五邑大学 土木与建筑学院，广东江门 529020
SchoolofCivilandArchitecturalEngineering,WuyiUniversity,Jiangmen529020,Guangdong,China
中图分类号:U 416.1
doi:10.3969/j.issn.1007-2993.2021.05.004
出版物：岩土工程技术
收稿日期:2020-10-30
刊出日期:2021-10-22
关键词:袋装砂井,公路软基处理效果,地表沉降,分层沉降,深层侧向位移,孔隙水压力
Key words:bagged sand well,treatment effect of highway soft foundation,ground surface settlement,layered settlement,deep lateral displacement,pore water pressure
文档包含图片数量：图片(16)张
文档包含表格数量：表格(4)个
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基金项目：
基金项目:住房和城乡建设部科学技术项目（2011-k5-36）
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