本文選題：動(dòng)態(tài)特性 + 配比��； 參考：《大連理工大學(xué)》2014年碩士論文

【摘要】：我國(guó)是世界上水能資源最豐富的國(guó)家之一。大力發(fā)展水電逐步減少一次能源在能源結(jié)構(gòu)中的比重,是進(jìn)入21世紀(jì)我國(guó)能源發(fā)展的重要戰(zhàn)略方針。我國(guó)80%以上的水能資源分布于西部,按照國(guó)家能源發(fā)展規(guī)劃,預(yù)計(jì)在未來(lái)10年中要陸續(xù)建設(shè)超過(guò)百米甚至高達(dá)三百多米的世界級(jí)高壩；但西部又是我國(guó)主要的地震區(qū),具有相當(dāng)高的頻度和烈度,因此對(duì)高壩的抗震技術(shù)研究不可避免且迫在眉睫。 高壩的抗震安全評(píng)價(jià)目前主要依賴數(shù)值模擬進(jìn)行研究,但是從試驗(yàn)角度來(lái)研究高壩地震反應(yīng)問(wèn)題,特別是壩體進(jìn)入非線性階段直到破壞的地震響應(yīng),仍是大壩抗震研究不可或缺的重要手段之一。 本文以沙牌工程為研究背景,以混凝土仿真材料的動(dòng)態(tài)特性為主要研究方向。目的是探索出一種合適配比的材料,為模型試驗(yàn)研究拱壩地震破壞形態(tài)和破壞機(jī)理做準(zhǔn)備。論文的主要工作包括以下幾個(gè)方面： 1、探索合適的配比,為模型試驗(yàn)做準(zhǔn)備。通過(guò)調(diào)整配比,探索水灰比、粗細(xì)骨料配比、添加劑等對(duì)于模型材料抗壓強(qiáng)度、劈裂強(qiáng)度、臨界應(yīng)變等性質(zhì)的影響；并通過(guò)總結(jié)對(duì)比,選擇出最優(yōu)配比。試驗(yàn)結(jié)果表明重晶石、礦粉會(huì)提高材料的脆斷性；重晶粉、砂子會(huì)降低材料的脆斷性；隨著齡期的增長(zhǎng),材料強(qiáng)度線性增長(zhǎng),脆斷性明顯提高； 2、探索加載速率對(duì)材料抗壓強(qiáng)度、劈裂強(qiáng)度、臨界應(yīng)變等的影響；通過(guò)直拉試驗(yàn),測(cè)量材料的抗拉強(qiáng)度。試驗(yàn)結(jié)果表明材料的抗壓強(qiáng)度、劈裂強(qiáng)度、抗壓吸能及抗壓彈性模量都會(huì)隨著加載速率的提高而提高； 3、通過(guò)不同尺寸試件的試驗(yàn),探索試件形狀對(duì)材料抗壓特性的影響。試驗(yàn)結(jié)果表明單軸抗壓強(qiáng)度會(huì)隨著試件尺寸的變大而降低,且高寬比達(dá)到3：1時(shí)趨近于一定值；彈性模量和吸能會(huì)隨著尺寸的增加而降低；尺寸會(huì)對(duì)試件的破壞形態(tài)產(chǎn)生影響。
[Abstract]:China is one of the countries with the most abundant water energy resources in the world. It is an important strategic policy for China to develop hydropower and gradually reduce the proportion of primary energy in the energy structure in the 21st century. More than 80% of the hydropower resources in China are distributed in the western part of the country. According to the national energy development plan, it is expected that more than 100 meters or even more than 300 meters of world-class dams will be built in the next 10 years, but the west is also the main earthquake area in our country. Because of its high frequency and intensity, it is inevitable and urgent to study the seismic technique of high dams. At present, seismic safety evaluation of high dams mainly depends on numerical simulation, but the seismic response of high dams is studied from the point of view of test, especially when the dam body enters the nonlinear stage until the seismic response of failure. It is still one of the most important methods in dam seismic research. This paper takes Shapai project as the research background and the dynamic characteristics of concrete simulation materials as the main research direction. The purpose of this paper is to explore a suitable material for model test to study the failure pattern and failure mechanism of arch dam. The main work of the thesis includes the following aspects: 1. To explore the appropriate ratio and prepare for the model test. The effects of water cement ratio, coarse aggregate ratio and additives on the compressive strength, splitting strength and critical strain of the model materials were explored by adjusting the ratio of water to cement, and the optimum ratio was selected by summing up and comparing. The experimental results show that barite and mineral powder can improve the brittle fracture of the material, the double crystal powder and sand will reduce the brittle fracture of the material, the strength of the material increases linearly with the increase of age, and the brittle fracture property increases obviously. (2) the influence of loading rate on the compressive strength, splitting strength and critical strain of the material is explored, and the tensile strength of the material is measured by Czochralski test. The results show that the compressive strength, splitting strength, compressive energy absorption and compressive elastic modulus of the material will increase with the increase of loading rate. 3. The influence of specimen shape on the compressive properties of the material was investigated through the experiments of different sizes. The experimental results show that the uniaxial compressive strength decreases with the size of the specimen and reaches a certain value when the aspect ratio reaches 3:1, the elastic modulus and energy absorption decrease with the increase of the size, and the size has an effect on the failure mode of the specimen.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TV642.4;TV431

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