本文選題：洞口段 + 二次襯砌��； 參考：《遼寧工程技術(shù)大學(xué)》2015年碩士論文

【摘要】：近年來,世界各國地震頻發(fā),給人民的生命和財產(chǎn)帶來嚴(yán)重威脅,隧道結(jié)構(gòu)是地下交通系統(tǒng)的重要結(jié)構(gòu),隧道結(jié)構(gòu)的破壞,不僅導(dǎo)致巨大的直接經(jīng)濟(jì)損失,而且還會阻礙救援工作的展開,導(dǎo)致重建工作拖延。對于整座隧道而言,在地震中隧道洞口最容易受到破壞,因此對隧道洞口段二次襯砌進(jìn)行抗震研究顯得十分必要。通過查閱相應(yīng)規(guī)范,確定淺埋隧道洞口段必須加強(qiáng)襯砌設(shè)計(即抗震設(shè)防),但并未能對如何進(jìn)行抗震設(shè)防設(shè)計做出規(guī)定,設(shè)計中常常根據(jù)經(jīng)驗(yàn)對襯砌進(jìn)行加強(qiáng),襯砌能否在設(shè)防烈度地震荷載作用下保持結(jié)構(gòu)完好具有很大的不確定性,襯砌剛度提高是否能提高其抗震性能也有待研究。針對以上問題,本文以躍龍門隧道洞口段二次襯砌為研究對象,以數(shù)值模擬為手段,對三維地震動作用下隧道洞口段二次襯砌進(jìn)行動力響應(yīng)分析,分析三維地震動作用的洞口段二次襯砌的最大位移、加速度、應(yīng)力和內(nèi)力,并進(jìn)行抗壓、抗拉強(qiáng)度驗(yàn)算。最后對不同剛度洞口段二次襯砌的抗震性能進(jìn)行探討,得出以下主要結(jié)論：(1)三維地震動作用下,隧道洞口段二次襯砌的應(yīng)力、剪力及彎矩最大值均在拱腳處取得,拱腳處應(yīng)力集中。設(shè)計時應(yīng)對拱腳處采取措施以減小拱腳處受力。(2)三維地震動作用下,躍龍門隧道洞口段二次襯砌的抗拉、抗壓性能均滿足規(guī)范要求,且抗拉及抗壓安全系數(shù)均大于規(guī)范要求值。躍龍門隧道洞口段二次襯砌抗震設(shè)防合理。(3)提高混凝土強(qiáng)度不能明顯提高洞口段二次襯砌的抗震性能。
[Abstract]:In recent years, earthquakes have occurred frequently all over the world, which have brought serious threat to people's lives and property. Tunnel structure is an important structure of underground traffic system. The destruction of tunnel structure not only leads to huge direct economic losses. It also impedes relief efforts and delays reconstruction efforts. For the whole tunnel, the tunnel opening is the most vulnerable to damage in the earthquake, so it is very necessary to study the earthquake resistance of the secondary lining of the tunnel opening. By referring to the corresponding codes, it is determined that the lining design must be strengthened (i.e. seismic fortification) at the entrance of shallow buried tunnel, but it fails to stipulate how to carry out seismic fortification design, and the lining is often strengthened according to the experience in the design. It is uncertain whether the lining can keep the structure intact under the earthquake load of fortification intensity, and whether the improvement of the lining stiffness can improve the seismic performance of the lining remains to be studied. Aiming at the above problems, this paper takes the secondary lining of Yuelongmen tunnel as the research object, and takes the numerical simulation as the means to analyze the dynamic response of the secondary lining of the tunnel under the action of three-dimensional ground motion. This paper analyzes the maximum displacement, acceleration, stress and internal force of the secondary lining in the opening section of the three-dimensional ground motion, and checks the compressive and tensile strength of the lining. Finally, the aseismic behavior of the secondary lining of the tunnel with different stiffness is discussed. The main conclusions are as follows: 1) under the action of 3-D ground motion, the maximum stress, shear force and bending moment of the secondary lining of the tunnel entrance are obtained at the arch foot. Stress concentration at arch foot. Under the action of 3-D ground motion, the tensile and compressive properties of the secondary lining at the entrance of Yuelongmen Tunnel all meet the requirements of the specification, and the safety factors of tensile and compression are higher than the required values of the specifications. The aseismic behavior of the secondary lining in the opening section of Yuelongmen Tunnel is not obviously improved by increasing the concrete strength.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U452.28

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本文編號：2006858