【摘要】：國(guó)際恐怖主義時(shí)刻威脅著國(guó)家的安全，具有顯著經(jīng)濟(jì)意義的大壩已經(jīng)成為恐怖主義重點(diǎn)打擊的目標(biāo)，大壩一旦出事，后果不堪設(shè)想，故對(duì)大壩在遭受爆炸荷載沖擊后的動(dòng)態(tài)響應(yīng)及抗爆防護(hù)措施的研究就十分必要。 重力拱壩兼具重力壩和拱壩的結(jié)構(gòu)特性，水下爆炸沖擊荷載下其破壞模式值得關(guān)注，本文主要分析重力拱壩在水下爆炸沖擊荷載作用下的動(dòng)態(tài)響應(yīng)并對(duì)抗爆防護(hù)措施進(jìn)行研究。 水下爆炸沖擊下重力拱壩動(dòng)態(tài)響應(yīng)分析�？紤]混凝土的應(yīng)變率效應(yīng)，建立混凝土重力拱壩水下爆炸全耦合模型，對(duì)水下爆炸沖擊下重力拱壩動(dòng)態(tài)破壞過(guò)程進(jìn)行了全性能數(shù)值仿真，針對(duì)重力拱壩的結(jié)構(gòu)特性及受力特點(diǎn)，探討大壩在水下爆炸沖擊荷載作用下的可能破壞模式及破壞機(jī)理。研究表明，重力拱壩兼有重力壩和拱壩的抗爆特性，大壩抗爆薄弱部位主要位于壩體中上部，重力拱壩壩身下部抗爆性能較強(qiáng)；當(dāng)炸藥在拱冠梁處起爆時(shí)，表孔中墩及邊墩發(fā)生沖切和震塌滑移破壞；當(dāng)炸藥在距右岸1/4拱圈處爆炸時(shí)，壩肩發(fā)生震塌破壞，影響壩肩抗滑穩(wěn)定及壩體整體安全性。 抗爆防護(hù)措施研究。將泡沫鋁應(yīng)用于重力拱壩上，數(shù)值模擬大壩的破壞模式，分析泡沫鋁的抗爆防護(hù)效應(yīng)，并分析泡沫鋁厚度及防護(hù)范圍對(duì)大壩破壞模式的影響。研究表明，，隨著泡沫鋁的厚度增大，大壩同時(shí)刻的破壞程度是降低的；防護(hù)范圍對(duì)大壩的破壞模式影響不大。
[Abstract]:International terrorism is always threatening the security of the country. Dams with significant economic significance have become the target of terrorism's priority attack. Once the dam is in trouble, the consequences will be unthinkable. Therefore, it is necessary to study the dynamic response and anti-explosion protection measures of the dam. Gravity arch dam has the structural characteristics of gravity dam and arch dam. The failure mode of gravity arch dam under underwater explosion impact load is worthy of attention. This paper mainly analyzes the dynamic response of gravity arch dam under underwater explosion impact load and studies the anti-explosion protection measures. Dynamic response Analysis of Gravity Arch Dam under underwater explosion. Considering the strain rate effect of concrete, a fully coupled model for underwater explosion of gravity arch dam is established. The dynamic failure process of gravity arch dam under underwater explosion is simulated numerically, and the structural characteristics and stress characteristics of gravity arch dam are analyzed. The possible failure mode and failure mechanism of dams under underwater blast impact load are discussed. The results show that gravity arch dam has the anti-explosion characteristics of gravity dam and arch dam, the weak part of the dam is mainly located in the middle and upper part of the dam body, and the anti-explosion performance of gravity arch dam is stronger than that of the gravity arch dam, and when the explosive is detonated at the arch crown beam, When the explosive explodes at a quarter of an arch circle from the right bank, the dam abutment collapses, which affects the stability of the abutment and the overall safety of the dam. Study on anti-explosion protection measures. This paper applies aluminum foam to gravity arch dam, numerically simulates the failure mode of dam, analyzes the anti-explosion protection effect of aluminum foam, and analyzes the influence of thickness and protection range of aluminum foam on the failure mode of dam. The results show that the damage degree of the dam decreases at the same time with the increase of the thickness of aluminum foam, and the protection range has little effect on the failure mode of the dam.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TV642.3;TV312

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