本文選題：圓形斷面地下結(jié)構(gòu)　切入點(diǎn)：地基彈簧剛度　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：我國(guó)經(jīng)濟(jì)現(xiàn)處于高速增長(zhǎng)階段,借鑒國(guó)內(nèi)及其他發(fā)達(dá)國(guó)家在地下結(jié)構(gòu)抗震領(lǐng)域的科研成果,我們對(duì)地下結(jié)構(gòu)的抗震設(shè)計(jì)不斷提出更高的要求。因此,發(fā)展有效的地下結(jié)構(gòu)抗震分析方法,完善我國(guó)地下結(jié)構(gòu)抗震設(shè)計(jì)體系,具有重要的科學(xué)意義和工程應(yīng)用價(jià)值。本文主要對(duì)圓形斷面地下結(jié)構(gòu)反應(yīng)位移法橫向抗震計(jì)算中包含多個(gè)自變量的法向和切向地層彈簧剛度數(shù)學(xué)表達(dá)式進(jìn)行了擬合。分析了多工況下地層-結(jié)構(gòu)模型反應(yīng)位移法和反應(yīng)加速度法模型邊界寬度合理取值,最后依托廈門軌道交通2號(hào)線一期工程對(duì)動(dòng)力時(shí)程法和三種擬靜力方法進(jìn)行了對(duì)比分析。論文主要工作如下:(1)分析了圓形斷面地下結(jié)構(gòu)地基彈簧剛度取值的影響因素,利用有限元計(jì)算方法計(jì)算出大量工況下地基彈簧剛度取值,根據(jù)對(duì)各影響因素敏感度分析建立了適用于反應(yīng)位移法橫向抗震計(jì)算的法向和切向地基彈簧剛度的計(jì)算公式,并對(duì)公式的系數(shù)進(jìn)行了擬合,最后對(duì)提出的公式進(jìn)行了驗(yàn)證;(2)以動(dòng)力時(shí)程分析方法計(jì)算結(jié)果為基準(zhǔn),研究不同埋深、不同地震波加速度峰值和不同圍巖等級(jí)下地層-結(jié)構(gòu)模型反應(yīng)位移法計(jì)算模型邊界寬度合理取值;(3)以動(dòng)力時(shí)程分析方法計(jì)算結(jié)果為基準(zhǔn),研究不同埋深、不同地震波加速度峰值和不同圍巖等級(jí)下反應(yīng)加速度法計(jì)算模型邊界寬度合理取值;(4)依托廈門市軌道交通2號(hào)線一期工程,根據(jù)文章中對(duì)各擬靜力抗震計(jì)算方法邊界問(wèn)題的研究結(jié)論,采用動(dòng)力時(shí)程法、反應(yīng)位移法、地層-結(jié)構(gòu)模型反應(yīng)位移法、反應(yīng)加速度法四種方法對(duì)隧道進(jìn)行抗震計(jì)算分析,將各種擬靜力計(jì)算結(jié)果與動(dòng)力時(shí)程分析結(jié)果進(jìn)行對(duì)比分析,驗(yàn)證提出結(jié)論的適用性。
[Abstract]:The economy of our country is now in the stage of rapid growth. Drawing on the scientific research achievements of domestic and other developed countries in the field of earthquake resistance of underground structures, we constantly put forward higher requirements for seismic design of underground structures. To develop an effective seismic analysis method for underground structures and improve the seismic design system of underground structures in China, It is of great scientific significance and engineering application value. In this paper, the mathematical expressions of spring stiffness in normal and tangential strata with multiple independent variables in lateral seismic calculation of circular underground structures with response displacement method are simulated. In this paper, the boundary width of the stratigraphic-structure model and the reaction acceleration method are analyzed. Finally, based on the first stage project of Xiamen Rail Transit Line 2, the dynamic time-log method and three pseudo-static methods are compared and analyzed. The main work of this paper is as follows: 1) analyzing the influence factors of spring stiffness of circular underground structure foundation. In this paper, the stiffness of spring is calculated by finite element method under a large number of working conditions. According to the sensitivity analysis of various factors, the formulas of spring stiffness in normal direction and tangential direction are established, which are suitable for lateral seismic calculation of response displacement method. The coefficients of the formula are fitted. Finally, the formula proposed is verified. (2) based on the results of dynamic time history analysis, the different buried depths are studied. Different seismic wave acceleration peaks and different surrounding rock classes are used to calculate the boundary width of the model by using the response displacement method of stratigraphic-structure model. The results of dynamic time history analysis are taken as the basis for the study of different buried depths. The boundary width of the model calculated by the response acceleration method under different seismic wave acceleration peaks and different surrounding rock classes is reasonably chosen. The method relies on the first phase of Xiamen Rail Transit Line 2, the first stage of which is based on the first stage of Xiamen Rail Transit Line 2. According to the research results of boundary problems of quasi-static seismic calculation methods in this paper, the dynamic time-process method, the response displacement method, the stratum structure model response displacement method and the reactive acceleration method are used to calculate and analyze the earthquake resistance of the tunnel. The results of quasi-static calculation and dynamic time history analysis are compared to verify the applicability of the proposed conclusions.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU93

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本文編號(hào)：1643471