碎石桩复合地基在大丽高速公路软土地基处理中的应用  

Application of gravel pile composite foundation in improving soft subgrade of Da-Li Highway

作　　者：张秀勇[1] 王海龙 李杰[1] ZHANG Xiuyong;WANG Hailong;LI Jie(Geotechnical Engineering Department,Nanjing Hydraulic Research Institute,Nanjing 210029,China;Planning Branch of Dongying Port Economic Development Zone,Dongying 257091,China)

机构地区：[1]南京水利科学研究院岩土工程研究所,江苏南京210029 [2]东营港经济开发区规划分局,山东东营257091

出　　处：《河海大学学报（自然科学版）》2021年第5期455-459,共5页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(51879090)。

摘　　要：大理至丽江的大丽高速公路位于云贵高原西北部,具有湖相沉积软土地基的特点,可采用碎石桩复合地基解决该类湖相沉积软土地基承载力的问题。结合现场勘测资料和室内试验数据分析了工程沿线地区湖相沉积软土的基本特性和碎石桩加固湖相沉积软土地基的效果;利用FLAC3D有限差分程序,采用复合模量均质法和群桩典型单元法建立模型对碎石桩复合地基进行了数值模拟。结果表明,路堤在这种柔性基础下,采用加设碎石垫层的碎石桩复合地基可以显著改善深厚软土地基的承载性能。Dali-Lijiang highway is located in the northwest of Yunnan-Guizhou Plateau with the lacustrine soft soil ground.The gravel pile composite foundation is adopted to increase the bearing capacity of the lacustrine soft soil ground.The field application of gravel pile foundation in the southwest highway soft ground treatment is discussed and studied.The basic features of lacustrine soft soil along the highway are investigated using the field and laboratory test data.Then,the effect of gravel pile on the bearing capacity of natural lacustrine soft ground is evaluated based on the field monitoring data.The"Composite modulus homogenization"and"typical pile group element method"are adopted for the simulation of gravel pile foundation in lacustrine soft ground based on FLAC3D.Simulation results show that under the flexible foundation of highway,the use of crushed stone composite foundation with crushed stone cushion is effective to improve the bearing capacity of deep soft ground.

关 键 词：高速公路路基 湖相沉积软土 碎石桩 柔性基础 数值模拟 大丽高速 

分 类 号：TU41[建筑科学—岩土工程]