本文選題：膨脹土隧道 + 鋼管混凝土支護(hù)結(jié)構(gòu)��； 參考：《山東大學(xué)》2017年碩士論文

【摘要】：隨著隧道建設(shè)規(guī)模和速度的迅猛發(fā)展,隧道建設(shè)過程中難免要穿過膨脹土這種復(fù)雜條件地層。由于傳統(tǒng)的支護(hù)方式不能滿足現(xiàn)實(shí)需要,導(dǎo)致該類隧道的安全及穩(wěn)定問題突出,膨脹土隧道圍巖新型支護(hù)技術(shù)亟待進(jìn)行深入研究。鋼管混凝土拱架由于其良好的力學(xué)性能已經(jīng)在礦山等地下工程中得到了應(yīng)用,控制變形效果顯著。然而針對(duì)膨脹土隧道圍巖鋼管混凝土支護(hù)技術(shù)的研究仍處于起步階段,在此背景下,本文主要進(jìn)行了以下的研究工作,并取得了相關(guān)有益結(jié)論。本文研究膨脹土隧道的變形破壞,并對(duì)鋼管混凝土拱架進(jìn)行了理論分析;然后以廣西云桂鐵路某隧道為工程背景,進(jìn)行了膨脹土隧道在干濕循環(huán)作用下開挖施工過程的模型試驗(yàn),分析了開挖過程、降雨及烘干情況下圍巖的應(yīng)力、位移演化規(guī)律,為膨脹土隧道的支護(hù)設(shè)計(jì)和施工安全提供了依據(jù)。鋼管混凝土支護(hù)結(jié)構(gòu)受力復(fù)雜,影響因素較多,僅通過理論研究和模型試驗(yàn)不能夠全面分析其受力特點(diǎn)�；贏BAQUS有限元分析軟件,針對(duì)不同支護(hù)結(jié)構(gòu)截面型式,研究了不同截面形式鋼管混凝土支護(hù)結(jié)構(gòu)的力學(xué)特性,并與傳統(tǒng)支護(hù)進(jìn)行對(duì)比分析,進(jìn)而闡述了鋼管混凝土支護(hù)效應(yīng)。結(jié)果表明,鋼管混凝土支護(hù)結(jié)構(gòu)承載能力大,支護(hù)效果好。其結(jié)果可為支護(hù)設(shè)計(jì)提供重要的參考依據(jù)。此外,本文采用基于連續(xù)介質(zhì)的可靠性計(jì)算方法,將鋼管混凝土支護(hù)結(jié)構(gòu)中的鋼管壁厚和混凝土膨脹角作為隨機(jī)變量,通過ABAQUS軟件分別求得支護(hù)最大應(yīng)力值關(guān)于鋼管壁厚和混凝土膨脹角的函數(shù),再將兩個(gè)變量進(jìn)行組合,從而得到支護(hù)最大應(yīng)力值關(guān)于隨機(jī)變量的顯示表達(dá)式,進(jìn)而對(duì)鋼管混凝土支護(hù)結(jié)構(gòu)的承載力的可靠度進(jìn)行了初步評(píng)估,并計(jì)算出了相應(yīng)的支護(hù)結(jié)構(gòu)可靠指標(biāo)。
[Abstract]:With the rapid development of the scale and speed of tunnel construction, it is inevitable to pass through the complex conditions of expansive soil in the process of tunnel construction. Because the traditional support method can not meet the practical needs, the safety and stability of this kind of tunnel is prominent, and the new supporting technology of surrounding rock of expansive soil tunnel needs to be deeply studied. Concrete-filled steel tubular arch frame has been applied in underground engineering such as mines because of its good mechanical properties, and the effect of deformation control is remarkable. However, the research on concrete-filled steel tube (CFST) supporting technology of expansive soil tunnel is still in its infancy. Under this background, the following research work has been carried out in this paper, and some useful conclusions have been obtained. In this paper, the deformation and failure of expansive soil tunnel are studied, and the concrete filled steel tube arch frame is theoretically analyzed, and then a tunnel of Yun-Gui railway in Guangxi is taken as the engineering background. The model test of the excavation process of expansive soil tunnel under the action of dry and wet circulation is carried out, and the evolution law of stress and displacement of surrounding rock under the conditions of excavation, rainfall and drying is analyzed. It provides the basis for the support design and construction safety of expansive soil tunnel. Concrete filled steel tube (CFST) supporting structure can not be fully analyzed by theoretical research and model test. Based on Abaqus finite element analysis software, the mechanical characteristics of concrete-filled steel tube (CFST) supporting structures with different cross-sections are studied, and compared with the traditional support, the effects of CFST support are discussed. The results show that the bearing capacity of concrete filled steel tube (CFST) supporting structure is large and the supporting effect is good. The results can provide important reference for support design. In addition, using the reliability calculation method based on continuous medium, the wall thickness of steel tube and the expansion angle of concrete filled steel tube in the concrete filled steel tube support structure are taken as random variables. By Abaqus software, the function of the maximum support stress value on the wall thickness of steel pipe and the expansion angle of concrete is obtained, and then the two variables are combined to obtain the display expression of the maximum support stress value on the random variable. Furthermore, the reliability of concrete filled steel tube supporting structure is evaluated and the corresponding reliability index of supporting structure is calculated.
【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)】：U455.7

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