津保铁路试验段路基沉降特性研究  

Research on the Settlement Characteristics of Subgrade in the Test Section of Tianjin-Baoding Railway

作　　者：崔维孝[1] 

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300142

出　　处：《铁道工程学报》2016年第10期33-38,89,共7页Journal of Railway Engineering Society

摘　　要：研究目的:深厚压缩层地基沉降控制是高速铁路路基关键技术。本文结合津保铁路建设,选取试验工点,对不同工程方案的沉降控制效果进行监测及分析,旨在揭示深厚压缩层地基条件下路基沉降与加固桩型、桩间距、桩长及桩顶基础结构的关系,选取合理的地基沉降计算与分析方法。研究结论:(1)预应力管桩加固地基与CFG桩加固地基、桩顶设置筏板基础与帽网基础沉降特性相近,可采用相同的沉降计算方法;(2)桩径、加固深度相同时,采用管桩加固桩间距取CFG桩桩间距加1倍桩径沉降控制效果接近;(3)桩型、桩径、桩间距、加固深度相同时,帽网基础路基沉降约是筏板基础的1.4倍;(4)路基沉降计算采用复合模量法时压缩层厚度应按应力比0.1取值,等效作用法应按应力比0.2取值;(5)0.6倍复合模量法计算结果与0.4倍等效作用法计算结果组合后,与实测数据的吻合程度明显提高;(6)本研究成果可为深厚压缩层地基路基工程沉降控制设计提供指导作用。Research purposes： The thick compressible foundation settlement control is the key technology of subgrade in the construction of high - speed railway. Based on the in - site test data and analysis of different types of ground treatment in the test section of Tianjin - Baoding Railway, this paper reveals the relations between the subgrade settlement and the type of reinforcement pile, pile spacing, length of pile and pile top foundation structure in deep thick compression layer of ground soil, selects proper method for settlement calculation and analysis. Research conclusions： （ 1 ） Since the settlement characteristics of prestressed pipe pile reinforced foundation and CFG pile reinforced foundation, pile top raft foundation and pile cap -net foundation are similar, the same settlement calculation method can be utilized. （2） If the diameter of pile and reinforcement depth is same, the pipe pile reinforcement spacing shall be the spacing of CFG pile plus one times of diameter of pile to achieve close settlement control. （3） If the type of pile, diameter of pile, pile spacing and reinforcement depth is same, the subgrade settlement of cap - net foundation is 1.4 times of raft foundation. （4） The thickness of compression layer shall be selected based on 0.1 of the stress ratio when utilizing composite modulus method for subgrade settlement calculation, and 0.2 of the stress ratio if equivalent application method is adopted. （5） When combining the 0.6 times of calculation results based on composite modulus method with the 0.4 times of equivalent application method calculation results, the fitness between the calculation results and field data increases dramatically. （6）The research results can be the guidance of subgrade settlement control design under condition of thick compressible foundation

关 键 词：筏板基础 帽网基础 路基 沉降特性 

分 类 号：TU433[建筑科学—岩土工程]