本文選題：安全評價　切入點(diǎn)：小浪底排沙洞　出處：《天津大學(xué)》2014年碩士論文

【摘要】：水工隧洞安全評價是保證隧洞結(jié)構(gòu)正常運(yùn)行的重要內(nèi)容，其目的是預(yù)測、找出和分析工程活動中潛在的風(fēng)險以及可能發(fā)生的有害后果，確立可行的安全對策和方法，對危險源進(jìn)行有效的控制，以減少事故發(fā)生率及事故損失，獲得最優(yōu)的安全保障。小浪底排沙洞是我國第一個應(yīng)用無粘結(jié)環(huán)錨預(yù)應(yīng)力混凝土襯砌技術(shù)的工程，在施工過程中排沙洞內(nèi)安置了大量的安全監(jiān)測儀器，運(yùn)行十多年來在經(jīng)歷了各種不同設(shè)計預(yù)定運(yùn)行水位的考驗(yàn)后，已累積了豐富的觀測資料。本課題以小浪底排沙洞為研究對象，通過運(yùn)用科學(xué)有效的方式歸納和處理排沙洞安全觀測數(shù)據(jù)，應(yīng)用水工隧洞安全評價技術(shù)理論，對環(huán)錨預(yù)應(yīng)力混凝土襯砌結(jié)構(gòu)的安全性進(jìn)行評價分析，研究在不同影響因素下結(jié)構(gòu)運(yùn)行狀態(tài)的安全性能，，提出解決工程安全隱患的有效途徑，驗(yàn)證安全評價方法在實(shí)際工程運(yùn)用中的可行性，為以后類似工程的安全評價分析提供明確的理論指導(dǎo)和重要的參考資料。研究內(nèi)容及結(jié)論主要有以下幾方面： （1）全面描述和總結(jié)了小浪底排沙洞工程概況，主要包括工程地質(zhì)水文條件、結(jié)構(gòu)布置情況及觀測儀器相關(guān)參數(shù)信息等。 （2）對排沙洞工程中實(shí)際存在的錨具槽漏油現(xiàn)象進(jìn)行安全評價分析，并進(jìn)一步研究探討襯砌預(yù)應(yīng)力錨索失效的問題，采用有限元方法模擬計算，發(fā)現(xiàn)排沙洞襯砌預(yù)應(yīng)力錨索失效的最不利情況為襯砌端部第一根錨索發(fā)生失效，當(dāng)錨索失效區(qū)域出現(xiàn)的拉應(yīng)力值過大時，很可能引發(fā)排沙洞混凝土開裂，從而導(dǎo)致襯砌滲漏等問題。 （3）在整理分析實(shí)測資料的基礎(chǔ)上對排沙洞運(yùn)行狀況進(jìn)行分析，分別研究溫度、水壓及自生體積變形等因素對排沙洞應(yīng)變的影響，并計算得出各因素影響下應(yīng)變影響系數(shù)，總結(jié)相應(yīng)的變形發(fā)展規(guī)律，判斷出運(yùn)行狀況時排沙洞襯砌安全性能良好。
[Abstract]:The safety evaluation of hydraulic tunnel is an important content to ensure the normal operation of the tunnel structure. Its purpose is to predict, find out and analyze the potential risks and possible harmful consequences in engineering activities, and establish feasible safety countermeasures and methods. In order to reduce the accident rate and accident loss and obtain the best safety guarantee, the dangerous source is controlled effectively. Xiaolangdi sand drainage tunnel is the first project in our country to use the unbonded ring anchor prestressed concrete lining technology. During the construction process, a large number of safety monitoring instruments were installed in the sand discharge tunnel. After more than a decade of operation, after experiencing the test of various different design scheduled operation water levels, Abundant observation data have been accumulated. Taking Xiaolangdi sand drainage tunnel as the research object, the safety observation data of the drainage tunnel are summed up and processed in a scientific and effective way, and the theory of hydraulic tunnel safety evaluation technology is applied. This paper evaluates and analyzes the safety of ring anchor prestressed concrete lining structure, studies the safety performance of the structure under different influence factors, and puts forward an effective way to solve the hidden trouble of engineering safety. To verify the feasibility of the safety evaluation method in practical engineering, to provide clear theoretical guidance and important reference materials for the safety evaluation analysis of similar projects in the future. The research contents and conclusions are as follows:. 1) the general situation of Xiaolangdi sand drainage tunnel project is described and summarized, including the engineering geological and hydrological conditions, the structure arrangement and the information of the relevant parameters of the observation instrument, etc. (2) the safety evaluation and analysis of the leakage phenomenon of anchor slot in sand drain tunnel engineering are carried out, and the failure of lining prestressed Anchorage cable is further studied, and the finite element method is used to simulate calculation. It is found that the most disadvantageous condition of the failure of the prestressed anchor cable is the failure of the first anchor cable at the end of the lining. When the tensile stress value of the failure zone of the anchor cable is too large, it may lead to the concrete cracking in the sand drain hole. As a result, the lining leakage and other problems. 3) on the basis of analyzing the measured data, the operation condition of the sand drain tunnel is analyzed, and the influence of temperature, water pressure and autogenous volume deformation on the strain of the drain tunnel is studied, and the strain influence coefficient under the influence of each factor is calculated. The corresponding deformation development law is summarized, and the safety performance of the lining of the sand discharge tunnel is good when judging the running condition.
【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】：TV554

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