本文選題：水工隧洞 + 高地溫�。� 參考：《廣西大學(xué)》2017年碩士論文

【摘要】：本文課題來源于國家自然科學(xué)基金資助項(xiàng)目"高地溫梯度水工高壓隧洞THM耦合作用下的承載特性研究(項(xiàng)目編號:51369007)",針對高地溫、高內(nèi)水壓力情況下水工隧洞常規(guī)混凝土襯砌在襯砌內(nèi)外壁間高溫度梯度和高內(nèi)水壓力聯(lián)合作用下拉應(yīng)力迭加導(dǎo)致襯砌嚴(yán)重開裂的工程問題,在襯砌結(jié)構(gòu)厚壁圓筒模型的結(jié)構(gòu)應(yīng)力分析的基礎(chǔ)上,本文開展了混凝土襯砌的玄武巖纖維增強(qiáng)樹脂復(fù)合材料(BFRP:Basalt Fiber Reinforced Polymer)網(wǎng)格增強(qiáng)技術(shù)的水工結(jié)構(gòu)模型試驗(yàn),試驗(yàn)中進(jìn)行了聲發(fā)射監(jiān)測與應(yīng)變的監(jiān)測,并開展了常規(guī)混凝土襯砌的對比試驗(yàn)。主要研究結(jié)論如下:(1)彈性力學(xué)分析結(jié)果表明,高地溫水工高壓隧洞在彈性工作階段的承載能力主要受控于溫度荷載和內(nèi)水壓力作用下的迭加拉應(yīng)力。在產(chǎn)生相同拉應(yīng)力的條件下,溫度梯度荷載與內(nèi)水壓力荷載之間存在明確的線性轉(zhuǎn)換關(guān)系。因此,在水工隧洞模型試驗(yàn)的加載過程中,采用一定內(nèi)水壓力模擬設(shè)定溫度荷載的拉應(yīng)力效應(yīng)的簡化加載方法是可行的,有利于降低模型試驗(yàn)加載的技術(shù)難度。(2)試驗(yàn)研究表明,與常規(guī)混凝土襯砌結(jié)構(gòu)相比較,在襯砌內(nèi)、外壁分別布設(shè)BFRP網(wǎng)格的混凝土襯砌結(jié)構(gòu)的彈性工作階段極限承載力提高了 21%,主宏觀裂縫最大開度減小了 68%,宏觀裂縫空間分布更為分散。(3)試驗(yàn)研究表明,與常規(guī)混凝土襯砌結(jié)構(gòu)相比較,BFRP網(wǎng)格增強(qiáng)襯砌結(jié)構(gòu)的開裂前內(nèi)壁環(huán)向拉應(yīng)變增大了 81%,開裂時(shí)的聲發(fā)射絕對能量占加載過程中聲發(fā)射總累積絕對能量的33.78%(前者為99.38%)。由此說明,常規(guī)混凝土襯砌結(jié)構(gòu)的主要破壞模式為脆性破壞,而BFRP網(wǎng)格增強(qiáng)襯砌結(jié)構(gòu)的主要破壞模式為延性破壞。BFRP網(wǎng)格的增強(qiáng)效應(yīng)來源于其所具有的良好抗拉和拉變形性能,從而有利于襯砌結(jié)構(gòu)整體承載能力的充分發(fā)揮。
[Abstract]:This paper comes from the research on the bearing characteristics of THM coupling in high geothermal gradient hydraulic tunnel (project No.: 51369007), funded by the National Natural Science Foundation of China, and aims at highland temperature. Under the condition of high internal water pressure, the combined action of high temperature gradient and high internal water pressure on the lining of conventional concrete lining of hydraulic tunnel leads to the serious cracking of lining. On the basis of structural stress analysis of thick-walled cylinder model of lining structure, the hydraulic structural model test of BFRP: Basalt Fiber reinforced Polymer mesh reinforcement technique for concrete lining basalt fiber reinforced resin composite has been carried out in this paper. The acoustic emission monitoring and strain monitoring are carried out, and the contrast tests of conventional concrete lining are carried out. The main conclusions are as follows: (1) the results of elastic mechanics analysis show that the bearing capacity of high temperature and high pressure tunnel is mainly controlled by the superimposed tensile stress under the action of temperature load and internal water pressure. Under the condition of the same tensile stress, there is a definite linear transformation relationship between the temperature gradient load and the internal water pressure load. Therefore, in the loading process of hydraulic tunnel model test, it is feasible to use a simplified loading method to simulate the tensile stress effect of a given temperature load under certain internal water pressure, which is helpful to reduce the technical difficulty of model test loading. In comparison with conventional concrete lining structures, The ultimate bearing capacity of concrete lining structure with BFRP mesh is increased by 21%, the maximum opening of main macroscopic crack is reduced by 68%, and the spatial distribution of macroscopic crack is more dispersed. The experimental research shows that the ultimate bearing capacity of concrete lining structure is increased by 21%, and the maximum opening degree of main macroscopic crack decreases by 68%, and the spatial distribution of macroscopic crack is more dispersed. Compared with conventional concrete lining structure, the internal wall circumferential tension strain of BFRP mesh reinforced lining structure increases by 81% before cracking, and the absolute energy of acoustic emission during cracking accounts for 33.78% of the total cumulative absolute energy of acoustic emission during loading (the former is 99.38%). It shows that the main failure mode of conventional concrete lining structure is brittle failure, while the main failure mode of BFRP mesh reinforced lining structure is ductile failure. The strengthening effect of BFRP mesh originates from its good tensile and tensile deformation properties. Therefore, it is advantageous to give full play to the overall bearing capacity of lining structure.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV554

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