【摘要】：南水北調(diào)工程寶郟段位于南水北調(diào)工程中線工程的河南省境內(nèi)。寶郟段的襯砌結(jié)構(gòu)采用了特殊的防滲保溫結(jié)構(gòu)，其中，噴砂加糙保溫板提高了襯砌結(jié)構(gòu)的抗凍性，改善了渠道在低溫下的工作條件；復(fù)合土工膜提高了輸水效率。但是，由于這種新型結(jié)構(gòu)的材料屬性復(fù)雜，接觸層面較多，加上復(fù)雜的自然與地質(zhì)因素，整體結(jié)構(gòu)的穩(wěn)定性有必要要進(jìn)一步深入研究。 本文以南水北調(diào)工程寶郟段位渠道襯砌為研究對(duì)象，自下而上分別對(duì)渠道襯砌結(jié)構(gòu)的各個(gè)組成部分進(jìn)行了分析。通過瑞典條分法和ANSYS數(shù)值模擬，分析了渠道邊坡和襯砌土體的穩(wěn)定性，，結(jié)果表明，1:2的邊坡具有足夠大的安全系數(shù)，能滿足工程穩(wěn)定的需要；研究了保溫板在結(jié)構(gòu)中的作用，熱穩(wěn)態(tài)分析與熱瞬態(tài)分析均證明，保溫板在控制熱量傳遞中具有較大作用，并通過熱量分度云圖的溫度等值線對(duì)保溫板的厚度選擇進(jìn)行了優(yōu)化；數(shù)值模擬表明，對(duì)于混凝土層無論是在自然狀態(tài)下還是在凍脹的狀態(tài)下，襯砌的坡腳與齒墻接觸部分都是應(yīng)力集中現(xiàn)象最明顯的部位，有必要對(duì)齒墻結(jié)構(gòu)進(jìn)行優(yōu)化設(shè)計(jì)；建立了凍脹作用下混凝土層受力模型，計(jì)算了其在特定環(huán)境下彎矩的分布，發(fā)現(xiàn)襯砌板的距下邊1/4處彎矩最大。最后，以室內(nèi)摩擦試驗(yàn)結(jié)果和數(shù)值模擬為基礎(chǔ)，分析了渠道襯砌結(jié)構(gòu)中可能出現(xiàn)滑移的原因。
[Abstract]:The treasure section of the South-to-North Water transfer Project is located in Henan Province, the middle route of the South-to-North Water transfer Project. The lining structure of Baoji section adopts special anti-seepage and heat preservation structure, among which, sand blasting and rough insulation board improve the frost resistance of the lining structure, improve the working conditions of the canal at low temperature, and the composite geomembrane improves the water transfer efficiency. However, the stability of the whole structure should be further studied because of its complex material properties, more contact layers and complicated natural and geological factors. This paper takes the channel lining of Baojiazhang Section of South-to-North Water transfer Project as the research object, and analyzes each component of the channel lining structure from the bottom to the top. The stability of channel slope and lining soil is analyzed by Swedish slice method and ANSYS numerical simulation. The results show that the 1:2 slope has enough safety factor to meet the need of engineering stability. The function of thermal insulation board in structure is studied. It is proved by thermal steady state analysis and thermal transient analysis that thermal insulation board plays an important role in controlling heat transfer, and the thickness selection of thermal insulation board is optimized by the temperature isoline of heat index cloud diagram. The numerical simulation shows that the contact part between the slope foot and the tooth wall of the lining is the most obvious part of the stress concentration, so it is necessary to optimize the design of the tooth wall structure. The stress model of concrete layer under frost heaving is established, and the bending moment distribution in specific environment is calculated. It is found that the bending moment of lining slab is the largest at 1 / 4 below. Finally, based on the results of indoor friction test and numerical simulation, the possible causes of slip in the tunnel lining structure are analyzed.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV672;TV543

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