本文關(guān)鍵詞：高摻粉煤灰常態(tài)混凝土與碾壓混凝土聯(lián)合筑壩研究　出處：《清華大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 高摻粉煤灰常態(tài)混凝土 碾壓混凝土 絕熱溫升 仿真計(jì)算

【摘要】：向家壩工程高摻粉煤灰常態(tài)混凝土與碾壓混凝土聯(lián)合筑壩的實(shí)踐,突破了原有筑壩理念。目前向家壩大壩已按期蓄水發(fā)電,各項(xiàng)監(jiān)測數(shù)據(jù)正常。快速施工是碾壓混凝土所具有的突出優(yōu)點(diǎn),未來混凝土重力壩在施工階段采用碾壓混凝土和常態(tài)混凝土聯(lián)合筑壩將成為緩解進(jìn)度壓力的有效手段,同時(shí)高摻粉煤灰的常態(tài)混凝土應(yīng)用也是今后水電建設(shè)發(fā)展的方向。因此,需要更好的分析高摻粉煤灰常態(tài)混凝土與碾壓混凝土熱力學(xué)性能,更真實(shí)的了解大壩工作性態(tài),并歸納總結(jié)聯(lián)合筑壩關(guān)鍵技術(shù)。本文首先利用溫度計(jì)、無應(yīng)力計(jì)、測縫計(jì)等各種監(jiān)測儀器的長齡期實(shí)測數(shù)據(jù),分析向家壩的壩區(qū)氣溫以及縱、橫縫開度等信息,反演大壩混凝土的線膨脹系數(shù),為之后的模型仿真計(jì)算提供條件參數(shù)。之后進(jìn)行了高摻粉煤灰常態(tài)混凝土與碾壓混凝土絕熱溫升與主要力學(xué)性能試驗(yàn)研究,用新發(fā)明專利技術(shù)試驗(yàn)反演絕熱溫升,對比高摻粉煤灰混凝土與碾壓混凝土的絕熱溫升曲線,可以得到常態(tài)混凝土的前期溫升快,碾壓混凝土后期溫升潛力大。以向家壩大壩實(shí)施配合比為基礎(chǔ),適當(dāng)調(diào)整配合比參數(shù),進(jìn)行常態(tài)混凝土多種粉煤灰摻量(20%、30%、40%)試驗(yàn),包括絕熱溫升、抗壓強(qiáng)度、劈拉強(qiáng)度、彈性模量試驗(yàn),分析得出隨著粉煤灰摻量增大,四項(xiàng)熱力學(xué)性能指標(biāo)均隨之減小。以試驗(yàn)所得絕熱溫升參數(shù)為基礎(chǔ),通過仿真計(jì)算,反演高摻粉煤灰常態(tài)混凝土與碾壓混凝土的絕熱溫升參數(shù),得到二者的絕熱溫升曲線。同樣可以得到常態(tài)混凝土的前期溫升快,碾壓混凝土后期溫升潛力大的結(jié)論。考慮施工季節(jié)、澆筑溫度、分層厚度、溫控措施以及蓄水情況,對泄4壩段施工期和運(yùn)行期的溫度場、應(yīng)力場進(jìn)行仿真計(jì)算。結(jié)果表明壩體冷卻通水效果良好,溫度場、應(yīng)力場均符合安全要求。最后,以泄4作為典型壩段,調(diào)整泄4壩段甲乙塊碾壓混凝土的力學(xué)參數(shù),計(jì)算壩段變形和應(yīng)力的變化,探索常態(tài)、碾壓兩種混凝土變形應(yīng)力性能的敏感性。
[Abstract]:The practice of the combination of high fly ash concrete and roller compacted concrete in Xiangjiaba project breaks through the original idea of dam construction. At present Xiangjiaba dam has been storing water and generating electricity on schedule. The monitoring data are normal and the rapid construction is the outstanding advantage of RCC. In the future, the use of RCC and normal concrete in the construction stage of concrete gravity dam will become an effective means to alleviate the progress pressure. At the same time, the application of normal concrete with high fly ash is also the development direction of hydropower construction in the future. Therefore, it is necessary to better analyze the thermodynamic properties of normal concrete and roller compacted concrete with high fly ash. More true understanding of dam working behavior, and summed up the key technologies of combined dam building. Firstly, this paper use thermometer, stress meter, jointmeter and other monitoring instruments of the long-term measured data. The temperature and the opening of longitudinal and transverse joints in Xiangjiaba dam area are analyzed and the linear expansion coefficient of concrete is retrieved. After that, the adiabatic temperature rise and the main mechanical properties of high fly ash concrete and RCC are studied. Comparing the adiabatic temperature rise curves of high fly ash concrete and roller compacted concrete, the temperature rise of normal concrete can be obtained quickly. The temperature rise potential of RCC in the later stage is great. Based on the mix ratio of Xiangjiaba dam and adjusting the mix ratio parameters properly, the test is carried out with the addition of multiple fly ash in normal concrete. Including adiabatic temperature rise, compressive strength, splitting tensile strength, elastic modulus test, the analysis shows that with the increase of fly ash content, the four thermodynamic performance indexes are all reduced, based on the adiabatic temperature rise parameters obtained from the test. Through simulation calculation, the adiabatic temperature rise parameters of high fly ash concrete and roller compacted concrete are inversed, and the adiabatic temperature rise curves of them are obtained, and the early stage temperature rise of normal concrete can also be obtained. Considering the construction season, pouring temperature, layering thickness, temperature control measures and water storage, the temperature field in construction period and operation period of dam section 4 is considered. The results show that the cooling water flow effect of dam body is good, and the temperature field and stress field all meet the safety requirements. Finally, the typical dam section is Xie4. The mechanical parameters of roller compacted concrete (RCC) in No.4 dam segment are adjusted, the deformation and stress changes of dam segment are calculated, and the sensitivity of deformation stress properties of normal and roller compacted concrete is explored.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TV544

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