钢管模袋混凝土扩径桩水平承载性能研究  

Study on horizontal bearing capacity ofconcrete-filled steel tubular bag expandedpile

作　　者：陈新泉 曾青林 王军伟 CHEN Xinquan;ZENG Qinglin;WANG Junwei(Xiamen aneng Construction Co.,Ltd,Xiamen 361004;The Guangdong NO.3 Water Conservancy and Hydro electric Engineering Board Co.,Ltd,Dongguan 523000;Zhejiang Hydropower Construction and Installation Co.Ltd,Hangzhou 310053)

机构地区：[1]厦门安能建设有限公司,福建厦门361004 [2]广东省水利水电第三工程局有限公司,广东东莞523000 [3]浙江水电建筑安装有限公司,浙江杭州310053

出　　处：《福建建筑》2022年第3期94-98,共5页Fujian Architecture & Construction

摘　　要：为研究钢管模袋混凝土扩径桩在水平荷载下的承载特性,依托福州城市内河的堤防建设工程,通过有限元分析和现场监测的方式,对钢管模袋混凝土扩径桩在不同注浆压力和扩孔率条件下的力学性能进行分析和比较。结果表明,在软土基坑开挖过程中,300 kPa注浆压力比100 kPa下的承载力增长0.25倍,而5%和10%的扩孔率条件下承载力可分别提高了0.36倍和0.54倍。此外,由于桩两侧土质不均匀和挤土效应造成了实测位移大于计算值,设计和施工过程中,应特别考虑周边地质不均匀的影响。In order to study the bearing characteristics of steel pipe mold bag concrete expanded pile under horizontal load,relying on the embankment construction project of Fuzhou urban inland river,the mechanical properties of steel pipe mold bag concrete expanded pile under different grouting pressure and hole expansion rate are analyzed and compared by means of finite element analysis and field monitoring.The results show that in the process of soft soil foundation pit excavation,the bearing capacity under 300kPa grouting pressure is 0.25 times higher than that under 100KPA,while the bearing capacity under 5%and 10%reaming rate can be increased by 0.36 times and 0.54 times respectively.In addition,the measured displacement is greater than the calculated value due to the uneven soil on both sides of the pile and the soil squeezing effect.In the process of design and construction,the influence of surrounding geological heterogeneity should be specially considered.

关 键 词：钢管模袋混凝土 挤土效应 扩孔率 

分 类 号：TU4[建筑科学—土工工程]