本文選題：襯砌結(jié)構(gòu) + 無粘結(jié)預(yù)應(yīng)力　； 參考：《天津大學(xué)》2014年碩士論文

【摘要】：環(huán)錨無粘結(jié)預(yù)應(yīng)力襯砌結(jié)構(gòu)在施工期和運(yùn)行期受到自重、錨索預(yù)應(yīng)力、洞室溫度變化、內(nèi)部高壓水頭等荷載的作用，在各種組合工況作用下其應(yīng)力狀態(tài)非常復(fù)雜，，如何采取有效手段對其應(yīng)力狀態(tài)進(jìn)行分析和模擬是一個(gè)很棘手的問題。作為一種新型的結(jié)構(gòu)形式，只有對其在各種工況下的應(yīng)力狀態(tài)進(jìn)行全面、深入的分析，才能找出各種工況變化對其應(yīng)力狀態(tài)影響的規(guī)律，為今后的類似結(jié)構(gòu)形式的應(yīng)用提供有利的參考。在以往的研究中，對無粘結(jié)預(yù)應(yīng)力襯砌施工張拉期的應(yīng)力分析已經(jīng)有了較多的研究結(jié)果，但對襯砌在溫度變化和水頭變化下的應(yīng)力狀態(tài)分析的研究結(jié)果還比較少。本文針對以上問題，基于小浪底歷年實(shí)測資料，采用回歸分析法對施工期溫度變化對襯砌應(yīng)力狀態(tài)的影響進(jìn)行了分析，采用單因子變量法對過水運(yùn)行期水頭變化對襯砌應(yīng)力狀態(tài)的影響進(jìn)行了分析。同時(shí)，基于ANSYS有限元程序?qū)κ┕て跍囟茸兓瘜σr砌應(yīng)力狀態(tài)的影響和過水運(yùn)行期水頭變化對襯砌應(yīng)力狀態(tài)的影響進(jìn)行了深入的研究。 結(jié)果表明，當(dāng)襯砌內(nèi)外溫差為負(fù)值時(shí)，會(huì)使襯砌內(nèi)側(cè)混凝土的壓應(yīng)力減小，對襯砌內(nèi)側(cè)的應(yīng)力狀態(tài)會(huì)造成不利的影響；而內(nèi)外溫差為正值時(shí)，則對襯砌內(nèi)側(cè)應(yīng)力狀態(tài)有利。隨著水位的增加，襯砌混凝土的環(huán)向壓應(yīng)力減小，即水頭增大時(shí)會(huì)導(dǎo)致襯砌混凝土中由預(yù)應(yīng)力錨索施加的環(huán)向壓應(yīng)力減小。但是無論是最大溫差作用還是最大水頭作用下，小浪底襯砌結(jié)構(gòu)均處于安全運(yùn)行的狀態(tài)下。
[Abstract]:The ring anchor unbonded prestressed lining structure is subjected to deadweight during construction and operation, the anchor cable prestress, the temperature change of the cavern, the effect of high pressure water head load in the interior, and the stress state is very complex under various combined working conditions. How to use effective means to analyze and simulate the stress state is a very difficult problem. As a new type of structure, only through comprehensive and in-depth analysis of the stress state under various working conditions, can we find out the law of the influence of the variation of various working conditions on the stress state. It provides a favorable reference for the application of similar structural forms in the future. In the previous studies, there have been many results in stress analysis of unbonded prestressed lining construction during tensioning period, but the results of stress state analysis of lining under temperature and water head change are still few. In view of the above problems, based on the measured data of Xiaolangdi over the years, the effect of temperature change on the stress state of lining during construction period is analyzed by regression analysis method. The influence of water head change on lining stress state was analyzed by single factor variable method. At the same time, based on ANSYS finite element program, the influence of temperature change on lining stress state during construction period and the influence of water head change on lining stress state during overwater operation are deeply studied. The results show that when the inner and outer temperature difference of the lining is negative, the compressive stress of the inner lining concrete will be reduced, and the stress state of the lining inner side will be adversely affected, while the inner stress state of the lining will be favorable when the inner and outer temperature difference is positive. With the increase of water level, the circumferential compressive stress of lining concrete decreases, that is, when the water head increases, the circumferential compressive stress applied by prestressed Anchorage cable in lining concrete decreases. However, under the action of maximum temperature difference or maximum water head, the lining structure of Xiaolangdi is in safe operation.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV332

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