铁道标准设计2025，Vol.69Issue(11)：48-55,8.DOI:10.13238/j.issn.1004-2954.202401180002
管桩-土工格室复合路基承载机理研究
Research on Bearing Mechanism of Pipe Pile-Geocell Composite Subgrade
摘要
Abstract
Pipe piles exhibit excellent bearing performance.To address issues including excessive railway subgrade settlement and insufficient foundation bearing capacity,this study investigates the bearing performance of subgrades under the synergistic action of pipe piles and geocells through laboratory model tests and finite element numerical simulations.It analyzed the variations in pile axial force,subgrade settlement,pile-soil stress ratio,and skin friction under static loading.A control group with a single gravel cushion was established through numerical simulation to further examine the interaction effect between geocells and pipe piles.The results showed that pipe pile-geocell composite subgrades exhibited excellent bearing performance in loess areas.Although differences existed between the model test and numerical simulation results,their variation trends were generally consistent,indicating that the simulation method was feasible.The central pile carried a greater portion of the upper load than the side piles.Under a 300 kPa load,the maximum axial force in the central pile was approximately four times that of the side piles.Compared with the single gravel cushion,subgrade settlement decreased by 5.19％under the condition of a geocell-reinforced gravel cushion.The pile-soil stress ratios of the four piles,from the interior to the exterior,increased by 13.36％,8.81％,3.54％and 2.80％,respectively,indicating that geocells could effectively reduce subgrade settlement and regulate the pile-soil stress ratio.The negative skin friction zone gradually expanded from the central pile to the side piles.With increasing load,the neutral point of the pile moved upward,and the maximum negative skin friction also increased correspondingly.These findings indicated that appropriately increasing the load could effectively reduce the zone of negative skin friction along the pile shaft.关键词
铁路路基/管桩/土工格室/复合路基/承载性能/模型试验/数值分析Key words
railway subgrade/pipe pile/geocell/composite subgrade/bearing performance/model test/numerical analysis分类
交通运输引用本文复制引用
邓友生,董晨辉,庄子颖,陈茁,吴阿龙,张宇凡..管桩-土工格室复合路基承载机理研究[J].铁道标准设计,2025,69(11):48-55,8.基金项目
国家自然科学基金项目(51878554,41672308) （51878554,41672308）
陕西省自然科学基础研究计划重点项目(2018JZ5012) （2018JZ5012）
