本文選題：水工隧洞 + 混凝土襯砌　； 參考：《工程科學與技術(shù)》2017年02期

【摘要】：地震作用下水工隧洞混凝土襯砌結(jié)構(gòu)的動態(tài)響應是工程設(shè)計和安全評估的重要內(nèi)容,建立科學合理的混凝土動力本構(gòu)模型以及內(nèi)水與襯砌動力耦合作用分析方法是襯砌結(jié)構(gòu)抗震研究的關(guān)鍵環(huán)節(jié)�；趹兛臻g靜力損傷本構(gòu)的基本思路,對3維應力狀態(tài)下混凝土靜態(tài)拉、壓損傷變量進行定義和求解;在此基礎(chǔ)上,考慮靜、動態(tài)荷載作用下混凝土本構(gòu)關(guān)系曲線的相似性特點,建立了適宜編程的混凝土動態(tài)損傷本構(gòu)模型�；趩蜗喙腆w介質(zhì)和流體介質(zhì)動力分析的顯式有限元法,結(jié)合耦合界面的邊界條件,建立了水工隧洞內(nèi)水與襯砌耦合作用的動力顯式有限元分析模型,該方法可以直接進行逐步積分,無需聯(lián)立方程組求解,大大簡化了計算過程,可以方便地用于分析多種介質(zhì)的波動傳播問題。針對某水電站引水隧洞工程進行了實例分析,計算結(jié)果表明:1)各部位混凝土襯砌處于同步震動狀態(tài),但腰拱部位位移明顯小于頂拱和底拱部位;2)地震作用下混凝土襯砌迅速進入損傷開裂狀態(tài),腰拱部位襯砌應力增加明顯,損傷破壞嚴重;3)開裂破壞區(qū)由腰拱逐漸向兩端擴展,與內(nèi)水直接作用的內(nèi)層襯砌結(jié)構(gòu)是抗震設(shè)計的薄弱環(huán)節(jié)。該模型能夠合理地反映水工隧洞混凝土襯砌的地震動響應特性,并為水工隧洞抗震設(shè)計提供了一種有效的分析方法。
[Abstract]:The dynamic response of concrete lining structure of hydraulic tunnel under earthquake is an important part of engineering design and safety assessment. Establishing a scientific and reasonable concrete dynamic constitutive model and the analysis method of the dynamic coupling between internal water and lining are the key links in the seismic research of lining structure. Based on the basic idea of static damage constitutive theory in strain space, the static tensile and compressive damage variables of concrete under three dimensional stress are defined and solved. Based on the similarity of constitutive curve of concrete under dynamic load, a suitable dynamic damage constitutive model of concrete is established. Based on the explicit finite element method for the dynamic analysis of single phase solid and fluid media and the boundary conditions of the coupled interface, a dynamic explicit finite element analysis model for the coupling of water and lining in a hydraulic tunnel is established. This method can be used to solve the problem of wave propagation in many kinds of media directly, without solving simultaneous equations, which greatly simplifies the calculation process. An example analysis of diversion tunnel project of a hydropower station is carried out. The calculation results show that concrete lining is in synchronous vibration state in every part of the concrete lining. However, the displacement of the waist arch is obviously smaller than that of the top arch and the bottom arch. Under the earthquake, the concrete lining rapidly enters into the state of damage and cracking, and the stress of the lining in the waist arch increases obviously, and the damage area expands gradually from the waist arch to the two ends. The inner lining structure acting directly with inner water is a weak link in seismic design. The model can reasonably reflect the ground motion response of hydraulic tunnel concrete lining and provide an effective analysis method for seismic design of hydraulic tunnel.
【作者單位】： 武漢大學水資源與水電工程科學國家重點實驗室;武漢大學水工巖石力學教育部重點實驗室;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃(“973”)資助項目(2015CB057904) 國家自然科學基金資助項目(51579191);國家自然科學基金資助項目(51279136)
【分類號】：TV312;TV672.1

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