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重力坝的抗滑稳定性是重力坝设计中的一项重要内容,它有时控制了坝体体积的大小,直接影响到工程造价的高低.因此如何提高其抗滑稳定安全性,是重力坝设计的一项重要课题.在以往的重力坝设计中,为了防渗或增加抗滑安全的需要,在坝踵下部常设置齿墙,它对于坝体的抗滑稳定性起一定的作用,可以使坝基水平滑动面变成倾向上游的斜坡,这样将迫使坝下的部分岩体连同坝体一起滑动,从而增加了重量,有利于坝的稳定.或者在坝体沿坝底面呈水平滑动时,齿墙和坝体间存在抗剪断力,同样起到抗滑的作用,当然应取用二者的小值,但在以往的设计中,齿墙的抗滑作用只当作安全的储备因素来对待.本文认为,齿墙常与坝体浇成整体,在分析坝体抗滑稳定、计算安全系数时,也应计入齿墙的作用,以达到既安全又经济的目的.
Anti-slide stability of gravity dam is an important part of gravity dam design. It sometimes controls the volume of dam body and directly affects the project cost. Therefore, how to improve the anti-sliding stability and safety of gravity dam is a key issue of gravity dam design In the past gravity dam design, in order to prevent seepage or increase the need for anti-skid safety, often set in the lower part of the heel toothed wall, which plays a certain role in the stability of the anti-sliding dam, you can make The horizontal sliding surface of the dam foundation becomes a slope inclined upstream, which will force part of the rock mass under the dam to slide together with the dam body, thereby increasing the weight, which is in favor of the stability of the dam, or when the dam body horizontally slides along the bottom of the dam There is shear resistance between the wall and the dam, also play the role of anti-skid, of course, should take both the small value, but in the past design, the anti-skid effect of the tooth wall only as a safe reserve factor to be treated In this paper, it is considered that the tooth wall is often integrated with the dam body, and when analyzing the anti - slide stability of the dam and calculating the safety factor, the function of the tooth wall should be taken into account so as to achieve the goal of safety and economy.