本文選題：重載鐵路 + 隧道��； 參考：《中南大學(xué)》2014年碩士論文

【摘要】：摘要：重載鐵路以其軸重大、運(yùn)能高、運(yùn)輸成本低等特點(diǎn),已經(jīng)成為鐵路運(yùn)輸發(fā)展的一個(gè)重要方向。列車軸重的增加必然會(huì)使軌下基礎(chǔ)承受更大的振動(dòng)荷載,對(duì)重載鐵路隧底結(jié)構(gòu)安全性造成影響。為了保證其運(yùn)營的安全穩(wěn)定,就要求結(jié)構(gòu)設(shè)計(jì)更合理并具有更長(zhǎng)的使用壽命。本文依托國家自然科學(xué)基金資助項(xiàng)目煤炭聯(lián)合基金(U1361204)和國家自然科學(xué)基金資助項(xiàng)目(51278494),采用理論分析和數(shù)值計(jì)算相結(jié)合的方法,對(duì)不同結(jié)構(gòu)型式、不同基底狀況下重載鐵路隧道底部結(jié)構(gòu)動(dòng)力響應(yīng)特性及疲勞壽命進(jìn)行了系統(tǒng)研究,主要研究?jī)?nèi)容和成果如下： (1)建立重載鐵路隧道-圍巖耦合三維有限元模型,探討了不同仰拱矢跨比、仰拱厚度、填充層厚度等條件下重載鐵路隧底結(jié)構(gòu)動(dòng)力響應(yīng)變化特征,量化分析了各結(jié)構(gòu)設(shè)計(jì)參數(shù)對(duì)動(dòng)力響應(yīng)的影響規(guī)律。 (2)根據(jù)隧底結(jié)構(gòu)受力狀態(tài),選擇合適的疲勞壽命預(yù)測(cè)方法,結(jié)合動(dòng)力有限元計(jì)算結(jié)果,利用疲勞計(jì)算軟件分析了不同結(jié)構(gòu)型式下隧底結(jié)構(gòu)疲勞壽命變化規(guī)律,提出了滿足隧道底部結(jié)構(gòu)耐久性與使用壽命的設(shè)計(jì)參數(shù)合理取值。 (3)通過動(dòng)力計(jì)算與疲勞壽命計(jì)算的對(duì)比分析,確定了隧底結(jié)構(gòu)是重載鐵路隧道設(shè)計(jì)的關(guān)鍵部位,結(jié)構(gòu)的受力狀態(tài)則是重載鐵路隧道設(shè)計(jì)中應(yīng)考慮的首要因素。 (4)采用動(dòng)力計(jì)算和疲勞計(jì)算相結(jié)合的方法,量化分析了隧道底部基巖軟化、基底脫空等基底狀況對(duì)隧底結(jié)構(gòu)動(dòng)力響應(yīng)及疲勞壽命的影響規(guī)律與影響程度,并探討了結(jié)構(gòu)疲勞壽命隨基底狀況變化的發(fā)展趨勢(shì)。
[Abstract]:Abstract: heavy haul railway, with its major axis, high transportation energy and low transportation cost, has become an important direction for the development of railway transportation. The increase of train axle load will inevitably make the base of the rail bear greater vibration load and influence the safety of the heavy load railway tunnel structure. In order to ensure the safety and stability of its operation, the structure requires structure. The design is more reasonable and has longer service life. In this paper, based on the National Natural Science Foundation of China, the project coal joint fund (U1361204) and the National Natural Science Fund support project (51278494), the combined method of theoretical analysis and numerical calculation is used to analyze the bottom structure of the heavy railway tunnel under different structural type and different base condition. The dynamic response characteristics and fatigue life are systematically studied. The main research contents and achievements are as follows:
(1) the three-dimensional finite element model of heavy load railway tunnel coupled with surrounding rock is established, and the dynamic response characteristics of the heavy load railway tunnel under the conditions of different invert arch span ratio, the thickness of the inverted arch and the thickness of the filling layer are discussed, and the influence of the design parameters on the dynamic response is quantified.
(2) according to the stress state of the tunnel structure, the suitable fatigue life prediction method is chosen, and the fatigue life change law of the tunnel bottom structure under different structural types is analyzed by the fatigue calculation software, and the reasonable value of the design parameters to meet the durability and service life of the tunnel bottom structure is put forward.
(3) through the comparison and analysis of the dynamic calculation and fatigue life calculation, it is determined that the tunnel structure is the key part of the heavy haul railway tunnel design, and the stress state of the structure is the most important factor to be considered in the design of heavy haul railway tunnel.
(4) using the method of dynamic calculation and fatigue calculation, the influence regularity and influence degree of the base rock softening at the bottom of the tunnel and the basement void on the dynamic response and fatigue life of the tunnel bottom structure are quantified, and the trend of the structural fatigue life changing with the base condition is also discussed.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U451;U239.4

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本文編號(hào)：1915863