高沥青混凝土心墙受拉特性的简化力学分析方法

高俊; 党发宁; 杨超; 任劼

doi:10.11779/CJGE201907012

高沥青混凝土心墙受拉特性的简化力学分析方法 English Version

西安理工大学西北旱区生态水利国家重点实验室,陕西西安 710048

基金项目: 国家自然科学基金项目（51679199）; 水利部公益性行业科研专项基金项目（201501034-04）; 陕西省科技统筹创新工程重点实验室项目（2014SZS15-Z01）

详细信息

作者简介:
高俊(1988— ),男,博士研究生,主要从事岩土及水利工程数值仿真分析的研究工作。E-mail：409938403@qq.com。

中图分类号: TV641.2
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出版历程
- 收稿日期: 2018-08-14
- 发布日期: 2019-07-24

Simplified mechanical analysis method for tensile characteristics of high asphalt concrete core

State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China

摘要

摘要: 目前,沥青混凝土心墙受力变形特性研究尚缺乏简化的分析方法。针对高沥青混凝土心墙存在严重的受拉现象,探讨了心墙产生拉应力的机理,结合拱结构的特殊传力机制,提出了减小心墙拉应力的构想,即将直线型心墙堆石坝设计成曲线型心墙堆石坝;基于Winkler弹性地基直梁和曲梁理论,构建了直线型心墙和曲线型心墙的简化力学分析模型;借助该模型分析了坝高和堆石料模量对直线型心墙的挠曲变形和拉应力（弯矩）的影响,考察了曲线型心墙减小其内部拉应力的效果。研究表明,建立的简化力学分析模型能够较好地反映心墙的受力变形特性;直线型心墙端部存在较大的拉应力,坝高越高和堆石料模量越小,心墙端部的拉应力越大,心墙产生拉破坏的风险越大;曲线型心墙借助挠曲变形使其轴线缩短和将横向荷载部分转化成轴向压荷载以减小弯矩以及增大轴向压力达到减小其端部拉应力的目的,曲线型心墙相较于直线型心墙拉应力减小约42.7%,显著改善了心墙的受拉特性,增强了心墙的安全性。
- 沥青混凝土心墙堆石坝 /
- 直线型心墙 /
- 曲线型心墙 /
- 弹性地基梁
Abstract: At present, there is no simplified method to study the mechanical and deformation characteristics of asphalt concrete core. Aiming at the serious tensile phenomenon of high asphalt concrete core, the mechanism of the core producing tensile stress is analyzed. The concept of reducing the tensile stress of the core is proposed. The rockfill dam with straight core is designed to be the rockfill dam with curved core combining with the special transmission mechanism of the arch structure. Based on the theory of Winkler elastic foundation straight beam and curved beam, the simplified mechanical analysis model for the straight core and curved core is established. The influences of the dam height and rockfill modulus on the deflection and tensile stress (bending moment) of the straight core are investigated. The effect of the curved core to reduce tensile stress is also investigated. The results show that the simplified mechanical analysis model can reflect the force and deformation characteristics of the core. And there exists large tensile stress at the end of the straight core. The higher the dam height and the smaller the rockfill modulus, the greater the tensile stress at the end of the core and the greater the risk of the core-producing tensile failure. The curved core shortens the axis with the help of deflection and transforms the lateral load into axial compression load to reduce the bending moment and increases the axial force to reduce the tensile stress at its end. Compared with the straight core, the curved core can reduce the tensile stress about 42.5% at its end, which can greatly improve the mechanical characteristics and increase the security of the core.
- rockfill dam with asphalt concrete core /
- straight core /
- curved core /
- elastic foundation

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参考文献(21)

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