鸟儿巢砌石拱坝应力分析

Stress Analysis of Niaoerchao Masonry Arch Dam

根据湖南省沅陵县鸟儿巢砌石拱坝施工采用分2期施工、2期蓄水的具体情况,提出了该拱坝完建后应力分析的方法,即该拱坝完建后应力分析也采用分2期施加荷载来计算应力然后合成的方法,其中泥沙荷载及温度荷载安排在第2期施加;另外,对于大坝分期施工与不分期施工的应力情况作了相应的比较,得出了大坝施工分2期施工、2期蓄水的方式,其完建后的合成应力一般可以满足规范要求,但放空水库时应注意控制水库总的下降水位不超过2 m。

According to that Niaoerchao Masonry Arch Dam on Yuanlin County, Hunan Province had been constructed and impounded on two steps, the whiter raised a method of stress analysis for the dam after built. This is that stress analysis had been also completed on two steps, then two results was composed as the final one. In the calculation, the loads of sediment and temperature are applied on the second step of stress analysis. Comparing the stress analysis results of dam construction with and without steps, the whiter obtained a conclusion that the composed stress of the dam generally met the requirement of standards when the dam adopted the method of constructing and impounding on two steps. But it should be plaid attention that falling stage must not be exceeded 20 m when the reservoir is emptied.