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环锚衬砌的预应力荷载传递机理及其应力状态解析

项目来源

国家自然科学基金(NSFC)

项目主持人

曹瑞琅

项目受资助机构

中国水利水电科学研究院

立项年度

2017

立项时间

未公开

项目编号

51709282

研究期限

未知 / 未知

项目级别

国家级

受资助金额

20.00万元

学科

工程与材料科学-水利工程-水工结构

学科代码

E-E09-E0906

基金类别

青年科学基金项目

关键词

荷载传递 ; 预应力结构 ; 环锚衬砌 ; 应力状态 ; Encircled anchored lining ; Prestressed structure ; Stress transformation ; Stress state

参与者

刘立鹏；郑理峰；高登辉；曾俊强；黄畅

参与机构

黄淮学院

项目标书摘要：环锚衬砌通过游动锚头把锚索封闭成环，主要利用套箍效应将锚索环向拉力转化为径向荷载使衬砌产生预应力，预应力荷载传递机理及其应力状态解析是确定环锚衬砌力学特性的关键。本项目基于离散—连续耦合数值方法研究环锚与衬砌的预应力荷载传递特性，结合现场监测验证和分析衬砌内部预应力荷载传递规律、围岩边界效应的影响规律，揭示环锚衬砌结构体系预应力荷载传递机理，提出单环锚及多环锚预应力等效荷载表达方法。考虑围岩加卸载屈服状态转变和主应力顺序转换对预应力场的影响，建立联合承载条件下的环锚衬砌结构力学计算模型，并建立环锚衬砌应力状态解析解。项目研究成果可为环锚衬砌结构设计及其工程应用提供理论支撑和参考。

Application Abstract: In traditional pre-stressed structure system,stress is mainly generated in the interaction of the anchoring end and stressing area.The encircled anchored lining close the anchor cable according to anchor head walking,which could transfer the circumferential stress into radial one,result in the pre-stress of lining structure.The study of stress transfer mechanism is a critical part in analyzing the mechanical characteristics of encircled anchored lining and in structure designing.Based on in-situ monitoring data and discrete-continuous coupling numerical method,this project analyzes the pre-stress transfer mechanism inside lining,the same mechanism between the encircled anchor and lining,the influence rules of surrounding rock boundary effect,to study the pre-stress transfer mechanism of encircled anchor-lining structure system.On the basis of above analyses,an expression of monocyclic anchor and polycyclic anchor pre-stress equivalent load method is proposed,a numerical model of anchor-lining structure under complex loading condition is established by considering the influence of surrounding rock yield situation in load-unload transition and the principal stress transformation.A stress state analytical equation is proposed which could be generally applied in engineering.This research provides a theory basis for anchor-lining structure designing and engineering applications,it also provides an analytical reference for numerical simulations in engineering.

项目受资助省

北京市

项目结题报告(全文)

新型预应力环锚钢筋混凝土衬砌具有抗高内压的能力，可为解决“覆盖层薄、地质条件差、内水压力高”的大断面压力隧洞支护问题，提供新途径，但力学性能的复杂性和不确定性阻碍了其广泛应用。为了进一步摸清环锚、混凝土衬砌和围岩之间的实际相互作用，在吉林省某6.8米直径输水隧洞中，利用环形扁千斤顶进行了创新性的环锚衬砌大型原位加载试验。揭示了张拉期和运行期的环锚受力变化规律、预应力筋后张过程中衬砌内预应力重分布特征以及内水荷载作用效果。以此为基础，基于离散—连续耦合数值方法研究环锚与衬砌的预应力荷载传递特性，结合现场监测验证和分析衬砌内部预应力荷载传递规律、围岩边界效应的影响规律，揭示环锚衬砌结构体系预应力荷载传递机理，提出单环锚及多环锚预应力等效荷载表达方法。考虑围岩加卸载屈服状态转变和主应力顺序转换对预应力场的影响，建立联合承载条件下的环锚衬砌结构力学计算模型，并建立环锚衬砌应力状态解析解。项目研究成果可为环锚衬砌结构设计及其工程应用提供理论支撑和参考。

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  • 1.Influencing factors of lining crack width in hydraulic tunnels under high internal water pressure

    • 关键词：
    • Safety factor;Reinforced concrete;Circumferential reinforcement;Numerical calculation;Pumped storage power station;Random distribution;Randomly distributed;Reinforced concrete lining;Reinforcement ratios;Reinforcement spacing
    • Cao, Ruilang;Wang, Yujie;Zheng, Lifeng;Zhao, Yufei
    • 《China Rock 2020 Conference》
    • 2020年
    • October 23, 2020 - October 26, 2020
    • Beijing, China
    • 会议

    The crack width of reinforced concrete lining under complex working conditions is a key factor affecting the safety of high-pressure hydraulic tunnels. This research investigates the lining of a pumped storage power station under high internal water pressure of 8.0 MPa. Considering the constraint of reinforcement and the combined bearing of rock mass and lining, the effect of circumferential reinforcement ratio, reinforcement location, tunnel radius, and surrounding rock on crack width is analyzed. On this basis, the relationship between the random distribution of lining parameters and crack width is obtained by numerical calculation. The results show the importance of adjusting the reinforcement spacing and reinforcement ratio to achieve the optimal constraint on the lining crack width. When the parameters are randomly distributed, the cracks appear locally mutated, but still form a strip distribution, with no obvious change in the average crack width.
    © Published under licence by IOP Publishing Ltd.

    ...

  • 2.The Influence of the Variable Thickness of Prestressed Linings with Annular Anchors on its Mechanical Properties

    • 关键词：
    • Anchors;Numerical methods;3-D numerical modeling;Diversion project;Hydraulic tunnels;Large diameter;Load-bearing capacity;Pressure tunnel;Variable thickness;Water pressures
    • Wang, Yujie;Cao, Ruilang;Shen, Qiang;Zhao, Yufei;Qi, Wenbiao
    • 《China Rock 2020 Conference》
    • 2020年
    • October 23, 2020 - October 26, 2020
    • Beijing, China
    • 会议

    By embedding annular anchors, prestressed linings with annular anchors provide active prestress, which can effectively resist the high internal water pressure in large-diameter hydraulic tunnels. The variable thickness of concrete liners along the circumference can significantly influence the mechanical properties of the lining. On the basis of the prestressed lining of a 6.8-m-diameter pressure tunnel in the Yinsong Diversion Project, we adopted a 3D numerical modeling method to study the influence of the average and local thicknesses of the lining on its mechanical properties. The results show that the prestress of the lining used in resisting the internal water pressure is ultimately derived from tensioning the annular anchors. The average thickness of the lining has little effect on its load-bearing capacity. In elliptical lining, an annulus of a slight tensile stress area appeared on the inner side of the lining, whereas the crown and invert sections will form the weak area because of structural bending moments.
    © Published under licence by IOP Publishing Ltd.

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