【作者】 石华军； 周兴扬； 吴亮； 冯仁祥； 朱斌；

【Author】 Shi Huajun;Zhou Xingyang;Wu Liang;Feng Renxiang;Zhu Bin;State grid Zhejiang Electric Power Company;Zhejiang Electric Power Design Institute;Institute of Geotechnical Engineering,Zhejiang University;

【机构】 国家电网浙江省电力公司； 浙江省电力设计院； 浙江大学岩土工程研究所；

【摘要】 强夯地基承载力、变形和稳定计算需要使用许多碎石土参数。由于强夯后碎石土的工程特性发生了明显改变,所需参数无法预先测试获得。基于舟山多端柔性直流输电示范工程地基处理工程实践,对软土滩涂换填强夯地基碎石土关键参数开展了针对性研究。首先提出了一套完整的碎石土参数测试方法和手段,通过颗分试验、固体体积率测试、土石比测试、大型固结压缩试验、大型三轴压缩试验获得了强夯前后碎石土的基本物理特性参数、变形特性参数和强度特性参数。分析总结了碎石土固体体积率的主要影响因素、压缩模量和固体体积率的关系以及土石比对变形和强度参数的影响等重要规律,为类似软土滩涂换填强夯地基工程建设提供了参考和借鉴。更多还原

【Abstract】 The crushed stone parameters are required to calculate the bearing capacity,deformation and stability of the dynamic compaction ground.While for the significant change of crushed stone in engineering characteristics after dynamic compaction,we can’t obtain the parameters in advance.Based on the ground treatment project of multiterminal high voltage direct current transmission project in Zhoushan,a targeted research was carried out on soil parameters for backfilled dynamic compaction ground on soft clay beach.Firstly,a system of test approaches for soil parameters were proposed;then,particle analysis test,solid volume ratio test,soil-rock ratio test,large consolidation test and large tri-axial compression test were carried out;lastly,physical parameters,deformation parameters and strength parameters of soil before and after dynamic compaction were obtained.This paper also summarized some important rules including the main influencing factors of solid volume ratio,the relationship between compression modulus and solid volume ratio and the effect of soil-rock ratio on deformation parameters and strength parameters.These results have reference value for similar exchange filling dynamic compaction ground treatment projects on soft clay beach.更多还原