本文關(guān)鍵詞： 高拱壩 特殊溫度荷載 橫縫 工作性態(tài)　出處：《天津大學》2014年碩士論文　論文類型：學位論文

【摘要】：拱壩設(shè)計時，為防止壩體混凝土產(chǎn)生裂縫，同時考慮混凝土施工的要求，必須設(shè)置橫縫。為保持拱壩成為一個整體結(jié)構(gòu)受力，橫縫必須進行妥善的處理，，如接縫灌漿。灌漿時，為保證橫縫張開度滿足要求，且為確保接縫灌漿質(zhì)量，除灌漿區(qū)混凝土溫度要降至設(shè)計封拱溫度外，灌區(qū)上部需有一定厚度蓋重區(qū)，且蓋重區(qū)溫度也應達到設(shè)計規(guī)定值。 黃河拉西瓦水電站實際運行條件與設(shè)計條件相比存在三種特殊運行工況，其一為由于施工進度、以及混凝土懸臂高度的影響，通過對大壩灌區(qū)及其蓋重區(qū)的溫度監(jiān)測資料分析后發(fā)現(xiàn)存在局部灌區(qū)封拱溫度比設(shè)計封拱溫度高的情況，據(jù)此可知，將存在局部拱圈封拱后壩體溫度荷載發(fā)生變化，本文研究了在此條件下拱壩整體應力條件的變化；在之后局部混凝土冷卻過程中橫縫的開度變化等工作性態(tài)的改變。 第二類特殊工況在于研究灌漿區(qū)上部蓋重區(qū)混凝土冷卻過程中對下部橫縫的影響，并討論對蓋重區(qū)混凝土冷卻的要求。 此外，對高拱壩而言，分期建造提前發(fā)電將會產(chǎn)生巨大的經(jīng)濟效益，但與一次建成一次蓄水相比，大壩的真實工作性態(tài)和常規(guī)結(jié)構(gòu)分析時的工作性態(tài)成果將會存在一定的差異。此問題也是本文關(guān)注的問題。 本項研究主要是針對拉西瓦混凝土拱壩設(shè)計中，對帶有普遍性的特殊工況下壩體工作性態(tài)進行分析，尋求新的合理評估分析方法。此項研究工作完善了研究拱壩局部溫度荷載的理論和方法，對于提高混凝土拱壩工作性態(tài)的分析計算研究水平，起到了推動作用。
[Abstract]:In the design of arch dam, in order to prevent cracks in dam body concrete and to consider the requirement of concrete construction, the transverse joint must be set up. In order to keep the arch dam as a whole structure, the transverse joint must be properly treated, such as joint grouting. In order to meet the requirements of transverse joint opening, and to ensure the quality of joint grouting, except for the temperature of concrete in grouting area to be reduced to the designed arch temperature, the upper part of irrigation area should have a certain thickness of cover area, and the temperature of cover area should also reach the designed value. Compared with the design conditions, there are three special operating conditions in the actual operation conditions of the Laxiwa Hydropower Station on the Yellow River. One is the influence of the construction schedule and the cantilever height of the concrete. Based on the analysis of the temperature monitoring data of the dam irrigation area and its overburden area, it is found that the temperature of the arch seal in the local irrigation area is higher than that of the designed one. According to this, the temperature load of the dam body will change after the partial arch ring is sealed. In this paper, the variation of the stress condition of the arch dam and the variation of the opening of the transverse joint during the local concrete cooling are studied in this paper. The second kind of special working condition is to study the influence of concrete cooling process on the bottom transverse joint in the upper cover area of grouting area and discuss the requirement of concrete cooling in the cover area. In addition, for high arch dams, the early generation of electricity by stages will bring great economic benefits, but compared with one water storage at a time, There will be some differences between the actual working behavior of the dam and the results of the conventional structural analysis, which is also a problem of concern in this paper. This research is mainly aimed at the analysis of the working behavior of the dam body under the special working conditions with universality in the design of the Lassiva concrete arch dam. A new reasonable evaluation and analysis method is sought. This work has perfected the theory and method of studying local temperature load of arch dam, and has played an important role in improving the level of analysis and calculation of the working behavior of concrete arch dam.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV642.4

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