【摘要】：摘要：我國自20世紀80年代開始發(fā)展重載鐵路以來,相繼建成大秦線、朔黃線、山西中南部通道等重載運輸線路。然而,隨著軸重增加,越來越多隧道基底出現開裂、破損、下陷及翻漿冒泥等病害,這些病害直接影響到貨運安全性與經濟性。本文依托國家自然科學基金煤炭聯(lián)合基金項目(U1361204)—《30t以上軸重條件下鐵路基礎設施動力特征及適應性》和國家自然科學基金資助項目(51278494)—《重載鐵路隧道底部結構服役性能演化機制與設計方法》,采用數值計算方法,系統(tǒng)分析了重載鐵路隧底結構動力響應特性。主要研究成果如下： (1)基于已有重載列車及軌道參數,建立車輛—軌道耦合動力模型,獲得了重載列車作用在隧底結構上的荷載時程曲線。 (2)基于已有重載鐵路隧道設計參數,建立重載鐵路隧道三維動力分析模型,分析了單、雙線重載鐵路隧道基底結構各部位動力響應特性,得到了軸重對隧底結構動力響應的影響規(guī)律。 (3)從隧底結構位移、加速度、應力三方面的增量分析了仰拱矢跨比、填充層厚度、仰拱厚度、鋪底厚度對單雙線重載鐵路隧底結構動力響應的影響,得出了基底各設計參數對其動力響應的影響規(guī)律。 (4)從隧底結構位移、加速度、應力三方面的增量分析了基巖軟化、脫空對雙線隧道隧底結構動力響應的影響,得到了基巖各因素對隧底結構動力響應的影響規(guī)律。圖78幅,表40個,參考文獻94
[Abstract]:Abstract: since the development of heavy-haul railway in 1980s in China, heavy haul transportation lines such as Daqin Line, Shuohuang Line and Central and Southern Corridor of Shanxi Province have been built one after another. However with the increase of axle load more and more defects such as cracking breakage sinking and mud breaking on the base of tunnel appear. These diseases directly affect the safety and economy of freight transportation. This paper relies on the project of the National Natural Science Foundation of China Coal Joint Foundation (U1361204)-dynamic characteristics and adaptability of Railway Infrastructure under the condition of < 30t Axial load "and supported by the National Natural Science Foundation of China (51278494)-< bottom junction of heavy-haul railway tunnel Evolution Mechanism and Design method of structure Service performance. The dynamic response characteristics of heavy haul railway tunnel bottom structure are systematically analyzed. The main research results are as follows: (1) based on the existing heavy haul train and track parameters, the vehicle-track coupling dynamic model is established. The load time history curve of the heavy haul train acting on the tunnel bottom structure is obtained. (2) based on the design parameters of the existing heavy-haul railway tunnel, the three-dimensional dynamic analysis model of the heavy-haul railway tunnel is established, and the single model is analyzed. The influence of axle load on the dynamic response of tunnel bottom structure is obtained. (3) from the increment of displacement, acceleration and stress of tunnel bottom structure, the rise-span ratio of inverted arch is analyzed. The influence of the thickness of the filling layer, the thickness of the inverted arch and the thickness of the bottom laying on the dynamic response of the tunnel bottom structure of single and double lines heavy haul railway tunnel is obtained, and the influence of the design parameters on the dynamic response of the tunnel bottom structure is obtained. (4) the displacement and acceleration of the tunnel bottom structure, The effect of bedrock softening and void removal on the dynamic response of the tunnel bottom structure is analyzed in three aspects of stress increment. The influence of each factor of the bedrock on the dynamic response of the tunnel bottom structure is obtained. 78 figures, 40 tables, 94 refs
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U451

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本文編號：2275403