铁道标准设计2024，Vol.68Issue(6)：161-170,10.DOI:10.13238/j.issn.1004-2954.202210050001
基坑装配式内支撑高脚螺栓-模袋混凝土固支端及其承载性能
A Fixed End Composed of Long Bolts and Mold Bag Concrete for Prefabricated Internal Support and Its Bearing Performance in Foundation Pit Engineering
摘要
Abstract
In the internal support system of foundation pit engineering,concrete support has been widely used in foundation pit engineering due to its advantages of high bearing capacity,unrestricted layout,cast-in-place end nodes and good integrity.However,the disadvantages of concrete support in design and construction are also very obvious,with problems such as large design section,long construction time,heavy pollution,high cost and serious waste.Therefore,in view of the advantages and disadvantages of concrete support in foundation pit engineering and combined with the characteristics of deep foundation pit engineering of metro open cut station,the prefabricated composite concrete filled steel tube internal support is designed in this paper.From the perspective of improving the stiffness and strength of end joints and achieving fixed connection at the end,a fixed end composed of long bolts and mold bag concrete is proposed,which is suitable for the prefabricated composite steel tube concrete internal support of metro foundation pit.The design scheme,structural characteristics and working principle of the fixed end are explained and compared with the cast-in-place concrete support node,which shows that the fixed end plays the role of fixed support in the support system,which is composed of special components such as embedded steel plate,hollow flange,bag concrete and long bolt.In order to establish the theoretical basis for the design and check of the fixed end,the analytical method of the compression and bending load-bearing capacity of the fixed end is obtained by analyzing the mechanical mechanism,failure mode and evolution law of the fixed end.In order to verify the feasibility of the theoretical analysis method of the bearing capacity of the fixed end,the theoretical and numerical results are verified and analyzed by numerical simulation,and the main factors affecting the bearing capacity of the fixed end are parameterized.关键词
地铁/明挖车站/深基坑工程/装配式组合钢管混凝土内支撑/固支端/模袋混凝土/承载性能Key words
metro/open cut station/deep excavation engineering/prefabricated composite concrete-filled steel tube internal support/fixed end/mold bag concrete/bearing performance分类
交通工程引用本文复制引用
单余含,张明聚,郭彩霞,郭飞,李鹏飞,高云昊,刘文杰..基坑装配式内支撑高脚螺栓-模袋混凝土固支端及其承载性能[J].铁道标准设计,2024,68(6):161-170,10.基金项目
国家自然科学基金面上项目(51978018) （51978018）
国家自然科学基金重点项目(51738010) （51738010）
北京市自然科学基金面上项目(8222005) （8222005）
