期刊文献+

水垫塘反拱形底板局部稳性分析 被引量:8

A Study on Local Stability of Counter-Arched Slab in Plunge Pool
下载PDF
导出
摘要 针对局部脉动随机荷载在某一时刻出现大的数值造成局部板块失稳的可能性,结合某高拱坝水垫塘反拱形底板稳定性的研究,用"随机拱"的概念,建立了基于板块极限失稳的力学模型和与其相应的物理模型,分析了单个板块的局部稳定性,导出了板块局部失稳极限抗力的表达式.力学模型计算和物理模型实验得出的极限抗力结果一致.从板块极限平衡角度得出了反拱形底板优于平底板的量化指标.结果表明,反拱形底板安全系数大于平底板3倍以上.以某高拱坝的工程实例计算了安全系数. The counter-arched slab in plunge pool keeps its integral stability by the thrust at spandrel when the load of jet-flow acts on it. It has the advantage that the resistance to pressure of concrete can be fully utilized. But the stability of flat slab depends only on the gravity and the anchor force. It is possible that the function of counter-arched slab does not form under specified condition because the construction crack exists along the direction of the arch ring and the non-uniform distribution of the flow load. For this reason, the possibility of the local failure of arch ring exists when a bigger local fluctuating load arises. Based on the concept of 'random arch', the mechanical model and the physical model for the limit stability of slab are set up. The local stability of the individual slab is analyzed and the formula of limit resistance for local stability of slabs is derivate. From limit balance, the quantitative factor of stability for counter-arched slab is obtained. The calculating and testing results indicate that the safety coefficient of local stability for counter-arched slab is three times greater than that of flat slab. Based on the study on stability for counter-arched slab in plunge pool of a high arch dam, the safety coefficient is calculated.
出处 《天津大学学报(自然科学与工程技术版)》 EI CAS CSCD 北大核心 2004年第7期605-609,共5页 Journal of Tianjin University:Science and Technology
基金 国家自然科学基金资助项目(50379033).
关键词 反拱形 水垫塘 力学模型 局部稳定性 counter-arched slab plunge pool mechanical model local stability
  • 相关文献

参考文献3

二级参考文献22

  • 1刘沛清,冬俊瑞,李永祥,余常昭.水垫塘内冲击射流特证及其对岩石河床的冲刷[J].水利学报,1995,27(1):19-26. 被引量:17
  • 2崔广涛.关于桃跌流对河床的动水压力及其基岩防护问题[J].天津大学学报,1982,1.
  • 3赵耀南.水流脉动压力沿灌隙的传播规律[J].天津大学学报,1988,3.
  • 4张廷芳.挑跌水流作用下水垫塘护坦稳定性研究[J].水利学报,1992,12.
  • 5姜文超.应用紊流理论探讨脉冲压力沿缝隙的传播规律[J].水利学报,1983,9.
  • 6刘沛清,泄水工程与高速水流,1993年,2期
  • 7冬俊瑞,长江科学院院报,1991年
  • 8柴华,硕士学位论文,1991年
  • 9崔广涛,1990年
  • 10崔广涛,高速水流情报网第二届全网大会论文集,1986年

共引文献65

同被引文献53

引证文献8

二级引证文献35

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部