桩网结构路基动静承载性状分析  

Bearing characteristics of geogrid reinforced pile supported embankment under static and dynamic load

作　　者：邓友生 李龙[1] 张克钦 李文杰 肇慧玲 Deng Yousheng;Li Long;Zhang Keqin;Li Wenjie;Zhao Huiling(Pile-Supported Structures Research&Test Center,Xi′an University of Science&Technology,Xi′an 710054,China;School of Civil Engineering,Xi′an Traffic Engineering Institute,Xi′an 710300,China)

机构地区：[1]西安科技大学桩承结构研究中心,西安710054 [2]西安交通工程学院土木工程学院,西安710300

出　　处：《黑龙江科技大学学报》2024年第2期255-262,共8页Journal of Heilongjiang University of Science And Technology

基　　金：国家自然科学基金项目(51878554);陕西省自然科学基础研究计划重点项目(2018JZ5012)。

摘　　要：为研究桩网结构路基在静动荷载作用下的承载性状,采用有限元分析方法对桩网结构路基在静动两种荷载下的承载特性、荷载传递机理、土拱形成及发展规律进行了数值计算。通过分析静动两种工况下桩土应力、桩周土压力分布、桩土应力比及土拱效应,并与试验结果进行了对比分析。结果表明:静载作用下基桩轴向应力约为400 kPa,最大土压力出现在路基中部,且沿路基横向向外逐渐减小;动载作用下沿路基横向布置的桩体的动应力在埋深方向呈先增大后减小趋势,其竖向应力最大值约为静载下的160%;动载下路基内部土拱效应较静载有大幅削弱,其中削弱最大的为四桩中心处的空间土拱效应,其桩土应力比约为静载的29.3%。This paper aims to study the bearing characteristics of geogrid reinforced pile supported embankment under static and dynamic loading.The study consists of conducting the numerical calculation analysis of the bearing characteristics,the load transfer mechanism,soil arch formation and development law of geogrid reinforced pile supported embankment under static and dynamic loading by finite element analysis;and comparing with the test result by analyzing the pile-soil stress,the distribution of soil pressure around the pile,pile-soil stress ratio and soil arching effect under both static and dynamic loading.The results show that the axial stress of foundation pile under static load is about 400 kPa,and the maximum of soil pressure appears in the middle of roadbed and decreases outward gradually along the roadbed;the dynamic stress of piles arranged transversely along the embankment first increases and then decreases in the buried depth direction under dynamic load,and the maximum vertical stress is about 160%larger than that under static load.The soil arching effect in embankment under static load is greatly weakened compared with that under static load,and the weakest effect appears at the center of four piles with the pile-soil stress ratio by 29.3%of the static load.

关 键 词：桩网结构路基 承载特性 动荷载 桩土应力比 土拱效应 

分 类 号：TU473[建筑科学—结构工程]