發(fā)布時間：2018-03-08 02:02

  本文選題：導(dǎo)流洞　切入點(diǎn)：堵頭　出處：《水電能源科學(xué)》2017年03期 　論文類型：期刊論文

【摘要】：為分析大體積混凝土在導(dǎo)流洞封堵過程中安全性,依托某電站工程實(shí)例,從熱力學(xué)理論出發(fā)進(jìn)行瞬態(tài)分析,通過理論計(jì)算相關(guān)參數(shù),運(yùn)用ANSYS軟件建立三維有限元模型,對未采取溫控的臨時堵頭和采用溫控永久堵頭澆筑全過程的溫度場及應(yīng)力場進(jìn)行仿真分析。結(jié)果表明,通水冷卻溫控措施使溫降速率明顯增大,混凝土溫度極值降低。入倉溫度降低有利于堵頭澆筑最高溫度和最大溫升的降低,同時有利于結(jié)構(gòu)主應(yīng)力量值的減小,且對較長的永久堵頭影響更明顯。通過APDL語言二次開發(fā)的程序,得到全過程的應(yīng)力極值及分布,可針對性采取工程措施降低應(yīng)力水平。結(jié)果可為類似工程提供參考依據(jù)。
[Abstract]:In order to analyze the safety of mass concrete in the plugging process of diversion tunnel, the transient analysis is carried out on the basis of thermodynamic theory, and the three-dimensional finite element model is established by using ANSYS software. The temperature field and stress field of temporary plug without temperature control and permanent plug with temperature control are simulated and analyzed. The results show that the temperature drop rate is obviously increased by temperature control measures of water cooling. The decrease of the temperature extreme value of concrete is beneficial to the decrease of the maximum temperature and the maximum temperature rise, and the decrease of the principal stress value of the structure, and the decrease of the entering temperature is beneficial to the reduction of the maximum temperature and the maximum temperature rise. The stress extremum and distribution of the whole process can be obtained by the second development program of APDL language, and the engineering measures can be taken to reduce the stress level. The results can provide a reference for similar projects.
【作者單位】： 四川大學(xué)水力學(xué)與山區(qū)河流開發(fā)保護(hù)國家重點(diǎn)實(shí)驗(yàn)室水利水電學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51079092)
【分類號】：TV551.16

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本文編號：1581902