%0 Journal Article
%A PENG Wen-ming
%T An Optimization for the Calculation Method of Deep Anti-sliding Stability with Multiple Sliding Surfaces for Gravity Dam
%D 2019
%R 10.11988/ckyyb.20181267
%J Journal of Yangtze River Scientific Research Institute
%P 1-8
%V 36
%N 4
%X In <em>Design code for concrete gravity dam</em> (NB/T 35026-2014) of China, the method for anti-sliding stability with multiple sliding surfaces gives the solution of resistance-action ratio <em>&eta;</em> based on the prerequisite that resistance &Delta;<em>Q</em><sub>i</sub> of sliding blocks meets internal force equilibrium. However, as the angles between &Delta;<em>Q</em><sub>i</sub> 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 &phi;<sub>i</sub> are not equal. In view of this, we optimized the method by replacing &Delta;<em>Q</em><sub>i</sub> with shear force <em>Q</em><sub>i</sub> between blocks, and proposed an iterative solution based on single variable <em>&eta;</em>. 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.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20181267