本文選題：地下洞群　切入點：交叉結(jié)構(gòu)　出處：《西南交通大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著公路行業(yè)的不斷發(fā)展,長大公路隧道在近年不斷涌現(xiàn)。與此同時,地下風機房洞群交叉結(jié)構(gòu)穩(wěn)定性分析已成為長大隧道輔助通道建設的關(guān)鍵技術(shù)之一。因此,開展隧道地下風機房洞室群交叉結(jié)構(gòu)穩(wěn)定性分析具有重要的理論意義和工程實踐價值。本文以寶塔山2#風機房地下洞群不同類型交叉結(jié)構(gòu)為研究對象,采用理論分析、室內(nèi)試驗以及數(shù)值分析相結(jié)合方法,以聚丙烯纖維混凝土在隧道交叉結(jié)構(gòu)中的運用為主線,對聚丙烯纖維混凝土基本力學性能和風機房交叉結(jié)構(gòu)采用該支護材料后在開挖過程中的變形、裂縫、接觸應力等變化規(guī)律展開了系統(tǒng)性的分析,為地下交叉結(jié)構(gòu)的安全施工提供了技術(shù)保障。主要研究內(nèi)容如下：(1)通過理論分析和室內(nèi)模擬實驗,研究素混凝土強度在摻不同含量聚丙烯纖維后的變化規(guī)律并得出對應的強度指標。(2)針對風機房地下洞群交叉結(jié)構(gòu)的復雜性,運用工程類比法提出不同交叉類型結(jié)構(gòu)的支護參數(shù),建立三維數(shù)值模型,通過分析地下洞群不同交叉段在采用聚丙烯纖維混凝土之后的圍巖變形、結(jié)構(gòu)內(nèi)力狀態(tài),支護結(jié)構(gòu)裂縫分布及破壞形式等施工力學行為,來評價圍巖及支護結(jié)構(gòu)的穩(wěn)定性,為以后類似工程的建設提供一定的理論及技術(shù)保障。(3)基于接觸算法,針對不同類別的典型交叉結(jié)構(gòu)單元分別建立接觸單元,研究分析了圍巖與支護結(jié)構(gòu)之間的法向、切向接觸應力,探明了不同交叉形式下,法向、切向接觸應力沿隧道縱橫向的整體分布形態(tài)、集中程度以及變化規(guī)律,同時對比分析了法向、切向隨開挖面積的變化規(guī)律。(4)通過分析隧道不同交叉段的縱向變形規(guī)律,探明了不同交叉結(jié)構(gòu)的變形影響范圍：雙T型交叉的影響范圍是交叉段最大跨徑的1.9倍,十字交叉的影響范圍是交叉段最大跨徑的2.1倍,T型交叉的影響范圍是交叉段最大跨徑的1.4倍。
[Abstract]:With the continuous development of highway industry, long and long highway tunnels have been emerging in recent years. At the same time, the stability analysis of cross-structure of underground fan caverns has become one of the key technologies in the construction of auxiliary tunnels. It is of great theoretical significance and practical value to carry out the stability analysis of cross structure of tunnel underground fan chamber group. This paper takes different types of cross structure of underground tunnel group in Baota Mountain as the research object, and adopts theoretical analysis. With the combination of laboratory test and numerical analysis, the application of polypropylene fiber reinforced concrete in tunnel cross structure is the main line. The deformation, crack and contact stress of polypropylene fiber reinforced concrete (PP fiber concrete) during excavation are analyzed systematically by using the supporting material in the cross-structure of the wind engine room and the basic mechanical properties of polypropylene fiber concrete, and the variation of the deformation, crack and contact stress during the excavation process is analyzed systematically. It provides a technical guarantee for the safe construction of underground cross structures. The main research contents are as follows: 1) through theoretical analysis and indoor simulation experiments, In view of the complexity of cross structure of underground cavity group in fan building, the support parameters of different cross type structures are put forward by using engineering analogy method, and the change law of strength of plain concrete with different content of polypropylene fiber is studied and the corresponding strength index is obtained. A three-dimensional numerical model is established to analyze the deformation of surrounding rock, the state of internal force of structure, the distribution of cracks and the failure form of supporting structure in different cross sections of underground cavity group after adopting polypropylene fiber concrete. To evaluate the stability of surrounding rock and supporting structure, to provide certain theoretical and technical support for the construction of similar projects in the future. Based on the contact algorithm, contact units are established for different types of typical cross structural units. The normal and tangential contact stress between surrounding rock and supporting structure is studied and analyzed. The distribution pattern, concentration degree and variation law of normal and tangential contact stress along the longitudinal and horizontal direction of tunnel under different cross forms are found out. At the same time, the variation law of normal and tangential direction with excavation area is analyzed. The influence range of deformation of different cross structures has been proved: the influence range of double T-type cross is 1.9 times of the maximum span of cross section. The influence range of cross is 2.1 times of the maximum span of the cross section and 1.4 times of the maximum span of the cross section.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U454

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