水泥粉煤灰碎石桩复合地基承载性能分析  

Analysis of Bearing Capacity of Composite Foundation with Cement Fly Ash Crushed Stone Pile

作　　者：麦浩 MAI Hao(Shenzhen Bay Area Urban Construction Development Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]深圳湾区城市建设开发发展有限公司,广东深圳518000

出　　处：《粉煤灰综合利用》2021年第4期40-44,87,共6页Fly Ash Comprehensive Utilization

摘　　要：水泥粉煤灰碎石桩是复合地基施工中的常用方法,可以有效提高复合地基的承载能力。基于此,以宁夏银川市某商业住宅楼工程的水泥粉煤灰碎石桩复合地基为背景,建立了FLAC 3D数值计算模型,分析了水泥粉煤灰碎石桩和不同结构荷载对复合地基的变形破坏特征的影响规律。研究结果表明:设置水泥粉煤灰碎石桩有效降低了地基土体的最大沉降、水平位移、最大竖向应力和塑性区范围,保证上方建筑的施工和使用要求;随上方筏板基础所受荷载的增大,复合地基的地表最大沉降值、水平位移值、塑性区增大,碎石桩的竖向应力增大,复合地基的竖向应力无显著变化。Cement fly ash gravel(CFG)pile is a common method in composite foundation construction,which can effectively improve the bearing capacity of composite foundation.Based on this,the FLAC 3D numerical calculation model was established against the background of CFG pile composite foundation of a commercial residential building project in Yinchuan,Ningxia,the influence law of CFG piles and different structural loads on the deformation and failure characteristics of composite foundation were analyzed.The results show that the site of CFG piles can effectively reduce the maximum settlement,horizontal displacement,maximum vertical stress and plastic zone of the foundation soil,and ensure the construction and use requirements of the upper building.With the increase of the load on the upper raft foundation,the maximum surface settlement value,horizontal displacement value and plastic zone of composite foundation increase,and the vertical stress of CFG piles pile increases,but the vertical stress of composite foundation has no significant change.

关 键 词：水泥 粉煤灰 碎石桩 复合地基 承载性能 

分 类 号：TU472.35[建筑科学—结构工程]