發(fā)布時(shí)間：2018-06-23 22:56

  本文選題：土石壩 + 接觸滲流　； 參考：《山東大學(xué)》2017年碩士論文

【摘要】：土石壩因結(jié)構(gòu)形式簡單、適用范圍廣、造價(jià)低等特點(diǎn)在國內(nèi)外水利工程中廣泛應(yīng)用。土石壩中的混凝土輸水管涵是一種應(yīng)用廣泛的水工建筑物。在實(shí)際工程中,土石壩的滲流問題已成為壩工建設(shè)中一項(xiàng)非常重要的課題,特別是由于庫水位的提高,庫水會(huì)通過壩體與混凝土涵管接觸面向下游滲透,一旦發(fā)生滲流破壞,會(huì)對(duì)工程造成嚴(yán)重的損失。在實(shí)際土石壩監(jiān)測中,由于土石壩與混凝土管涵接觸處的壓實(shí)度不夠、沒有反濾層工程防護(hù)措施等,較多壩體與管涵接觸面的地方出現(xiàn)了滲流破壞現(xiàn)象,對(duì)壩體安全運(yùn)營產(chǎn)生很大影響。因此,研究土與混凝土接觸滲流破壞機(jī)理及影響因素,對(duì)保證工程安全具有重要意義。土石壩與混凝土輸水管涵的接觸滲流問題屬于典型的土與混凝土接觸滲流問題。本文通過室內(nèi)試驗(yàn)和數(shù)值模擬相結(jié)合的方法,研究土與混凝土接觸滲流的影響因素,總結(jié)研究該現(xiàn)象發(fā)生的原因、啟動(dòng)條件和破壞條件。并該研究內(nèi)容應(yīng)用于大屯水庫工程實(shí)際,分析管涵周圍土體滲透系數(shù)變化對(duì)接觸滲流破壞的影響,為土壩安全運(yùn)營提供了科學(xué)依據(jù)。論文總結(jié)了土與混凝土接觸滲流的國內(nèi)外研究現(xiàn)狀,確定了影響土與混凝土接觸滲流的三個(gè)主要影響因素:土體壓實(shí)度、含粘量、反濾層;設(shè)計(jì)不同的試驗(yàn)工況開展室內(nèi)試驗(yàn),研究了控制接觸滲流破壞的三個(gè)影響因素與啟動(dòng)水力坡降、破壞水力坡降的變化關(guān)系:土樣壓實(shí)度越高、含粘量越大、設(shè)置反濾層均可提高啟動(dòng)水力坡降和破壞坡降;通過ABAQUS數(shù)值分析不同工況啟動(dòng)水力坡降、破壞坡降的變化情況,并與試驗(yàn)結(jié)果進(jìn)行對(duì)照;由于工程實(shí)際中水力坡降的變化與土體滲透系數(shù)的變化密不可分,將以上方法應(yīng)用于大屯水庫大壩工程實(shí)際中,通過滲透系數(shù)的變化模擬不同施工壓實(shí)度,總結(jié)壩體與混凝土管涵接觸滲流流速變化,為理論研究與實(shí)際工程安全運(yùn)營提供科學(xué)合理的參考依據(jù)。
[Abstract]:Earth-rock dam is widely used in water conservancy projects at home and abroad because of its simple structure, wide application range and low cost. Concrete aqueduct culvert in earth-rock dam is a widely used hydraulic structure. In practical engineering, the seepage problem of earth-rock dam has become a very important subject in dam construction, especially because of the increase of reservoir water level, the reservoir water will infiltrate downstream through the interface between dam body and concrete culvert pipe, once seepage failure occurs, It will cause serious damage to the project. In the actual monitoring of earth-rock dam, because of the insufficient compaction of the contact between earth-rock dam and concrete pipe culvert, and the absence of protective measures of filter layer engineering, the seepage failure occurs in more places where the interface between dam body and concrete pipe culvert appears. It has great influence on the safe operation of dam body. Therefore, it is of great significance to study the failure mechanism and influencing factors of contact seepage between soil and concrete to ensure engineering safety. The contact seepage between earth-rock dam and concrete pipe culvert is a typical contact seepage problem between soil and concrete. In this paper, the influence factors of contact seepage between soil and concrete are studied by means of laboratory test and numerical simulation, and the causes, starting conditions and failure conditions of the phenomenon are summarized and studied. The research content is applied to the engineering practice of Datun Reservoir, and the influence of the change of soil permeability coefficient around the pipe culvert on the contact seepage failure is analyzed, which provides a scientific basis for the safe operation of the earth dam. This paper summarizes the research status of contact seepage between soil and concrete at home and abroad, and determines three main factors that affect the contact seepage between soil and concrete: soil compaction, viscosity content, filter layer, design of different test conditions to carry out laboratory tests. The relationship between three influencing factors of controlling contact seepage failure and start-up hydraulic gradient and the change of damage hydraulic gradient is studied: the higher the compaction degree of soil sample, the greater the viscosity content, and the setting of filter layer can increase the starting hydraulic gradient and damage slope; Through Abaqus numerical analysis of the change of hydraulic slope and damage slope under different working conditions, and compared with the test results, because the change of hydraulic slope in engineering practice is closely related to the change of soil permeability coefficient, The above method is applied to the dam engineering of Datun Reservoir. Through the variation of permeability coefficient to simulate different compaction degree of construction, the change of flow velocity of contact seepage between dam body and concrete pipe culvert is summarized. It provides a scientific and reasonable reference for theoretical research and practical engineering safety operation.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV223.4

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