摘要
为使软基在分级加载排水固结过程中变形与稳定性的计算方法更加接近于工程实际,采用压缩固结与剪切试验的方法,得到抗剪强度指标及压缩模量随固结压力、固结度的变化规律;依据分级加载固结度理论,采用逐级改变计算参数的方法,得到相对于满载各加载阶段的固结度;建立起逐级改变计算参数的有限元模型,预测软土地基的变形与稳定性。研究结果表明:采用逐级改变计算参数模型所得到的变形量与实测结果更接近,在预压末期沉降偏差不超过3.0 cm;随填土高度的增加,安全系数先减小后增大,潜在滑裂面呈现收缩趋势。研究成果可为开展这方面的研究工作和软基设计提供依据。
In order to explore the calculation method of deformation and stability of soft foundation in the process of consolidation by graded loading and drainage,the method of compression consolidation and shear test is applied to obtain the change law of shear strength index and compression modulus with consolidation pressure and consolidation degree;based on the theory of consolidation degree by graded loading,the method of changing calculation parameters step by step is used to obtain the consolidation degree relative to each loading stage of full load;a finite element model with changing calculation parameters step by step is established to predict the deformation and stability of soft foundation.The results of the study show that:the deformation obtained by the model with grade-by-grade variation of calculation parameters is closer to the measured results,and the settlement deviation at the end of preload does not exceed 3.O cm;the safety factor decreases and then increases with the increase of filling height,and the potential slip crack surface shows a contraction trend.The results of the paper can provide a basis for carrying out research work in this area and for the design of soft foundations.
作者
刘红军
刘克伦
陈锋
杨超
LIU Hong-jun;LIU Ke-lun;CHEN Feng;YANG Chao(WuyiUniversity,Jiangmen529020,China;Zhuhai Hengqin Chengyuan Engineering Consulting Co.Ltd.,Zhuhai 519000,China)
出处
《公路》
北大核心
2023年第4期10-15,共6页
Highway
基金
国家自然科学基金青年科学基金项目,项目编号41702323
广东省普通高校特色创新项目(自然科学类),项目编号2020KTSCX152
五邑大学研究生创新创业项目,项目编号2020CX66
五邑大学学生创新创业项目,项目编号2020CX10。
关键词
路基工程
软基变形与稳定性
逐级改变计算参数
分级加载固结度理论
有限元模型
subgrade engineering
soft foundation deformation and stability
step-by-step change of calculation parameters
graded loading solidity theory
finite element model
