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本文通过对重力坝坝体在下游水压力作用下的受力情况分析,重点阐述了坝基浮托力的计算,改进了用阿基米德原理计算坝基浮托力的方法,研究并使用了按有效渗径法计算重力坝坝基浮托力。把溢洪道渲泄设计(或校核)洪水历时的长短,坝下游水深的大小及坝基岩石渗透性能强弱等因素对浮托力大小的影响,进行了足量的分析研究,并应用到工程设计实际中去。应用这种计算方法,可以减少作用在坝基相压力的值,对于保持坝体稳定,减少坝体工程量,节省工程投资等方面都将起到良好的作用。
Based on the analysis of the stress of gravity dam body under the action of the downstream water pressure, this paper mainly elaborates the calculation of the abutment floating force, improves the method of calculating the abutment floating force with Archimedes’ principle, Effective Diameter Method for Calculating Gravity Dam Foundation Floating Force. The impact of the spillway design (or check) flood duration, the depth of the dam downstream of the dam and the rock permeability of the rock and other factors on the size of the float force, the sufficient analysis and research, and applied to the actual engineering design Go in. Applying this calculation method can reduce the value of the pressure acting on the dam foundation, which will play a good role in maintaining the stability of dam, reducing the amount of dam works and saving the project investment.