水泥粉煤灰碎石桩复合地基对于软基的加固效果研究  

Reinforcement Effect of Cement Fly Ash Gravel Pile Composite Foundation for Soft Foundation

作　　者：卢兰萍[1] 张泽浩 张宇超 LU Lan-ping;ZHANG Ze-hao;ZHANG Yu-chao(School of Civil Engineering,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]河北工程大学土木工程学院,邯郸056038

出　　处：《科学技术与工程》2022年第20期8877-8883,共7页Science Technology and Engineering

基　　金：国家自然科学基金(51908178)。

摘　　要：在中国软土地区的高速公路建设中,经常面临着土体压缩性大,承载能力弱的问题。为了改善软土路基承载力低、压缩性大的力学性质,依托福州市一个路桥过渡段水泥粉煤灰碎石(cement fly ash gravel, CFG)桩复合地基工程,运用MIDAS GTS/NX建立纵断面模型,分别建立天然地基与CFG桩复合地基模型,进行静力固结分析。提取相同位置的沉降值,与横断面模拟沉降值以及现场沉降监测数据进行对比分析,结果显示:CFG桩复合地基的沉降比天然地基减小了13.6 cm,且纵断面模型模拟沉降结果与横断面模拟沉降值以及现场监测结果基本一致,沉降变化趋势也相近,说明CFG桩复合地基加固软基的有效性以及有限元模拟的可靠性。研究结果可为软土地基的加固工程提供一定的理论参考与借鉴。In the construction of expressways in soft soil areas in China,the problems of high soil compressibility and weak bearing capacity are often faced.In order to improve the mechanical properties of soft soil subgrade with low bearing capacity and high compressibility,based on a cement fly ash gravel(CFG)pile composite foundation project in the transition section of a road and bridge in Fuzhou,and MIDAS GTS/NX was used to establish a longitudinal section model,and a natural foundation and CFG pile composite foundation models were established respectively for a static consolidation analysis.The settlement value of the same position was extracted,and compared with the simulated settlement value of the transverse section and the monitoring data of the field settlement.The results show that the settlement of the CFG pile composite foundation is 13.6 cm less than that of the natural foundation,and the simulated settlement results of the longitudinal section model are similar to those of the transverse section.The simulated settlement values and on-site monitoring results are basically the same,and the settlement trends are also similar,indicating the effectiveness of the CFG pile composite foundation to strengthen the soft foundation and the reliability of the finite element simulation.The research results can provide some theoretical reference and reference for the reinforcement engineering of soft soil foundation.

关 键 词：水泥粉煤灰碎石(CFG)桩 桩复合地基 软土地基 数值模拟 软基加固 

分 类 号：U416[交通运输工程—道路与铁道工程]