长江科学院院报 ›› 2019, Vol. 36 ›› Issue (4): 1-8.DOI: 10.11988/ckyyb.20181267

• 专家特约稿 • 上一篇    下一篇

重力坝多滑面深层抗滑稳定计算的优化方法

彭文明   

  1. 中国电建集团成都勘测设计研究院有限公司 勘测设计分公司, 成都 610072
  • 收稿日期:2018-11-29 修回日期:2019-03-01 出版日期:2019-04-01 发布日期:2019-04-18
  • 作者简介:彭文明(1978-),男,江西宜春人,教授级高级工程师,硕士,主要从事水工结构设计和计算工作。E-mail:pwm02@163.com

An Optimization for the Calculation Method of Deep Anti-sliding Stability with Multiple Sliding Surfaces for Gravity Dam

PENG Wen-ming   

  1. Power China Chengdu Engineering Corporation Limited, Chengdu 610072, China
  • Received:2018-11-29 Revised:2019-03-01 Online:2019-04-01 Published:2019-04-18

摘要: 《混凝土重力坝设计规范》(NB/T 35026—2014)给出的多滑面深层抗滑稳定计算方法,以条块抗力ΔQi满足内力平衡条件求解抗力作用比η。由于ΔQi与水平向的夹角φi各不相同,规范方法进行ΔQi的标量求和没有物理意义,未能真正满足内力矢量平衡。因此,规范方法理论体系不严谨,在φi不相等时求解结果可能是错误的。鉴于规范方法的不足,以条块之间的剪力Qi替换ΔQi,对规范公式进行修正,并提出基于单变量η的迭代求解方法,解决了规范存在的问题,提高了多滑面稳定计算的实用价值。通过典型算例和工程实例,进一步验证了规范方法的不严谨可能导致不可接受的计算错误,同时证明了文中提出的优化方法的准确性和实用性。

关键词: 重力坝, 多滑面, 深层抗滑稳定, 迭代求解, 刚体极限平衡, 优化方法

Abstract: In Design code for concrete gravity dam (NB/T 35026-2014) of China, the method for anti-sliding stability with multiple sliding surfaces gives the solution of resistance-action ratio η based on the prerequisite that resistance ΔQi of sliding blocks meets internal force equilibrium. However, as the angles between ΔQi and horizontal direction are different, the method in the code is of no physical significance, hence could not really meet the balance of internal force vectors. In this paper, we demonstrates that the theoretical system of the method in the code is not rigorous, which might give rise to wrong result when the values of φi are not equal. In view of this, we optimized the method by replacing ΔQi with shear force Qi between blocks, and proposed an iterative solution based on single variable η. Through typical examples and engineering applications, we further verified that the imprecision of the standard method may lead to unacceptable calculation errors; and at the same time, we proved the accuracy and practicability of the proposed method in this paper.

Key words: gravity dam, multiple sliding surface, deep slide-resistant stability, iterative solution, rigid-body limit equilibrium, optimization method

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