基坑工程中桩锚支护结构的力学变形特性研究  

Study on the Mechanic and Deformation Characteristics of Interaction of Pile-anchor in Foundation Pit Supporting Structure

作　　者：陈涵[1] 雷鸣[1] 程成[1] 汪中林[1] 

机构地区：[1]长江大学城市建设学院,湖北荆州434023

出　　处：《长江大学学报（自然科学版）》2017年第5期60-63,共4页Journal of Yangtze University(Natural Science Edition)

基　　金：湖北省自然科学基金项目(2015CFB667);湖北省教育厅科学技术研究项目(Q20141307);大学生创新训练计划项目(2015004)

摘　　要：桩锚支护体系是基坑工程中常用的支护形式,由于其独特的支护特性和受力性能,在工程实际中被广泛应用。为研究桩锚结构的力学变形特性,结合某深基坑工程实例,运用岩土有限元软件MIDAS GTS NX,分析预应力锚杆和普通注浆锚杆组成的桩锚支护结构的力学变形规律。结果表明,在基坑开挖到底后,预应力锚杆+排桩的支护结构,排桩的最大水平位移为13mm,预应力锚杆的最大轴力为145kN;普通注浆锚杆+排桩的支护结构,排桩的最大位移值为28mm,注浆锚杆的最大轴力为53kN;相比普通注浆锚杆而言,预应力锚杆具有较好的限制变形能力,该研究成果可为类似工程提供一些参考。The pile-anchor supporting system is commonly used in foundation pit engineering and widely used in engineering practice because of its unique support characteristics and mechanical performance.In order to research the mechanic deformation characteristics of the pile-anchor structure,combined with a deep foundation pit engineering example,the finite element software MIDAS GTS NX is used to analyze the mechanic deformation law of the pile-anchor supporting structure that consisted of pre-stressed bolt and common bolt grouting.Results show that after the excavation is to the end,the maximum horizontal displacement of the pile is 13mm and the maximum axial force of the pre-stressed anchor is 145kN of the supporting structure with pile and pre-stressed anchor;the maximum horizontal displacement of the pile is 28mm and the maximum axial force of the grouting bolt is 53kN of the supporting structure with pile and ordinary bolt grouting bolt.Compared to common grouting bolt,pre-stressed anchor has good ability to limit the deformation.Research results can provide some references for the similar projects.

关 键 词：基坑支护 MIDAS 预应力锚杆 注浆锚杆 

分 类 号：TU170[建筑科学—建筑理论]