本文選題：拱效應(yīng)系數(shù) + 土石壩心墻��； 參考：《人民黃河》2017年09期

【摘要】：結(jié)合小浪底大壩監(jiān)測資料,基于有效應(yīng)力算法,采用一個能表征心墻拱效應(yīng)強(qiáng)弱的評價指標(biāo),對大壩心墻拱效應(yīng)進(jìn)行計(jì)算。結(jié)果表明:施工期拱效應(yīng)系數(shù)變化較穩(wěn)定,豎向范圍內(nèi)壩體上部的拱效應(yīng)比下部顯著,同一高程拱效應(yīng)系數(shù)中間部位最小,向上游和向下游逐漸增大,土壓力呈馬鞍形分布,心墻中部附近土壓力最小;運(yùn)行期同一高程拱效應(yīng)從上游到下游依次減弱,拱效應(yīng)系數(shù)主要受庫水位和土體固結(jié)排水因素的影響,短期內(nèi)受庫水位影響大,長期則受土體固結(jié)排水的影響,拱效應(yīng)系數(shù)的變化與庫水位變化正相關(guān),從總體趨勢看,拱效應(yīng)系數(shù)在緩慢減小;所有測點(diǎn)拱效應(yīng)系數(shù)均大于零,說明壩體處于安全狀態(tài)。
[Abstract]:Based on the monitoring data of Xiaolangdi Dam and based on the effective stress algorithm, an evaluation index is adopted to calculate the effect of the core arch of the dam. The results show that the arch effect coefficient changes steadily during the construction period, the arch effect of the upper part of the dam is more significant than that of the lower part in the vertical range, the middle part of the arch effect coefficient of the same elevation is the smallest, and the upstream and downstream gradually increase, and the earth pressure is saddled. The earth pressure near the middle part of the core wall is the smallest, the arch effect of the same elevation decreases from upstream to downstream, the arch effect coefficient is mainly affected by the water level of reservoir and the consolidation and drainage of soil, and the influence of water level of reservoir is great in the short term. Under the influence of soil consolidation and drainage for a long time, the change of arch effect coefficient is positively related to the change of reservoir water level. From the general trend, the arch effect coefficient is decreasing slowly, and the arch effect coefficient of all measured points is greater than zero, which indicates that the dam body is in a safe state.
【作者單位】： 長沙理工大學(xué)水利工程學(xué)院;中南大學(xué)土木學(xué)院;湖南水利水電職業(yè)技術(shù)學(xué)院;
【分類號】：TV641.41

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