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ΔQ_i满足内力平衡条件求解抗力作用比η。由于ΔQ_i与水平向的夹角φ_i各不相同,规范方法进行ΔQ_i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φ_i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Q_i替换ΔQ_i,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。
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 Δ Q i of sliding blocks meets internal force equilibrium. However, as the angles between Δ Q i 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 φ i are not equal. In view of this, we optimized the method by replacing Δ Q i with shear force Q i 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.
作者
彭文明
PENG Wen-ming(Power China Chengdu Engineering Corporation Limited, Chengdu 610072, China)
出处
《长江科学院院报》
CSCD
北大核心
2019年第4期1-8,共8页
Journal of Changjiang River Scientific Research Institute
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
gravity dam
multiple sliding surface
deep slide-resistant stability
iterative solution
rigid-body limit equilibrium
optimization method
