高速铁路人工填土区域桩板结构路基优化设计研究  

Optimization Design of Pile-Slab Structure Subgrade in Artificial Fill Areas of High-speed Railways

作　　者：王凯 陈勇 孙东泽 崔俊杰 WANG Kai;CHEN Yong;SUN Dongze;CUI Junjie(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《铁道标准设计》2024年第12期8-13,30,共7页Railway Standard Design

基　　金：中国中铁股份有限公司科技开发计划课题(2020-引导248);中铁工程设计咨询集团有限公司科技开发计划重点课题(研2020-6)。

摘　　要：为分析深厚人工填土区域桩板结构路基设计参数对其力学与经济指标的影响敏感性并提出优化方案,依托梅龙高速铁路人工填土路基加固处理项目开展桩板结构优化设计研究,结合Python语言研发的桩板结构路基的前后处理程序,考虑多因素多指标,提出基于正交试验的桩板结构路基优化设计方法,分别采用单指标极差分析法与多指标综合分析法研究各主要参数的影响敏感性,明确了适用于深厚人工填土桩板结构路基设计的最优组合方案。研究结果表明:(1)采用提出的正交试验法进行桩板结构路基优化设计时,建议综合考虑力学技术指标与经济指标,并选取桩纵向间距、承载板厚度、桩直径、桩长为优化因素;(2)桩纵向间距是影响跨中弯矩和桩顶弯矩的最显著因素,桩径是影响路基沉降和钢筋应力的最显著因素,混凝土用量和桩板结构总造价与承载板厚度和桩直径有较大的相关性;(3)桩板结构尺寸优化方案参数为桩纵向间距6 m,承载板厚度0.8 m,桩径1 m,桩长20 m,相较原设计方案地基处理造价降低21.33%,且路基沉降量保持不变。In order to analyze the sensitivity of design parameters of pile-slab structure subgrade in deep artificial fill areas to the mechanical and economic indicators of the subgrade,and to propose an optimization scheme,this study was conducted based on the subgrade reinforcement project of the Meizhou-Longchuan High-Speed Railway artificial fill,focusing on the pile-slab structure optimization design.Using pre-and post-processing programs developed with Python,considering multiple factors and indicators,an optimization the design method for pile-slab structure subgrade based on orthogonal tests was proposed.The sensitivity of the major parameters to various indicators was investigated using both single-indicator range analysis and multi-indicator integrated analysis methods,and the optimal combination scheme for the design of deep artificial fill pile-slab structure subgrades was identified.The results showed that:(1)When using the proposed orthogonal test method for the optimization design of pile-slab structure subgrade,it was recommended to comprehensively consider both technical and economic indicators,and to select pile longitudinal spacing,load-bearing plate thickness,pile diameter and pile length as optimization factors;(2)Pile longitudinal spacing was the most significant factor affecting the mid-span bending moment and pile-top moment,while pile diameter was the most significant factor affecting subgrade settlement and steel stress.Concrete consumption and total cost of the pile-slab structure had a high correlation with the thickness of the bearing plate and pile diameter;(3)The optimized pile-slab structure dimensions were:pile spacing of 6 m,bearing plate thickness of 0.8 m,pile diameter of 1m and pile length of 20 m.Compared with the original design,the cost of foundation treatment cost was reduced by 21.33%,while the subgrade settlement remained unchanged.

关 键 词：高速铁路 铁路路基 人工填土 桩板结构 正交试验 单指标极差分析 多指标综合分析 优化设计 

分 类 号：U238[交通运输工程—道路与铁道工程] U213.1