本文選題：黃土隧道 + 初期支護�。� 參考：《長安大學》2014年碩士論文

【摘要】：初期支護作為隧道的主要支護結(jié)構(gòu)，對維持圍巖穩(wěn)定、控制圍巖變形具有重要作用。錨噴支護作為常用的初期支護，噴層薄、強度弱，難以改善部分黃土隧道變形大、難收斂的現(xiàn)象，初期支護承載能力的不足，將對隧道施工和運營帶來安全隱患。因此，針對黃土隧道初期支護展開研究，具有現(xiàn)實意義。 本文針對黃土隧道支護特點，提出了鋼管混凝土支護體系，即利用空心鋼管、注漿后形成鋼管混凝土及模筑混凝土組成的支護體系，作為黃土隧道的初期支護，旨在通過增大初支厚度和剛度提高承載能力，減小施工對黃土介質(zhì)的擾動，最大程度的保存圍巖的天然強度，嚴格控制圍巖的變形。本文應(yīng)用假定抗力法及數(shù)值計算等方法，對鋼管混凝土支護體系的成本經(jīng)濟性，支護效果，結(jié)構(gòu)安全性及不同施工工法下的圍巖變形和結(jié)構(gòu)受力特性進行了研究分析。 對鋼管混凝土支護體系和錨噴支護進行比選，從成本經(jīng)濟性和支護效果兩方面進行考慮，，得出較為合理的初支形式，并作出評價。 應(yīng)用假定抗力法，對鋼管混凝土支護體系的襯砌內(nèi)力進行了計算，驗算結(jié)構(gòu)安全性。 應(yīng)用MIDAS/GTS軟件建立三維仿真模型，針對中斷面和大斷面黃土隧道的常用施工方法（環(huán)形開挖留核心土法和CD法），以鋼管混凝土支護體系為對象，重點研究了施工過程中圍巖變形情況和支護結(jié)構(gòu)自身的受力情況，揭示了圍巖與支護結(jié)構(gòu)施工力學行為的空間效應(yīng)。 以上研究結(jié)果表明：鋼管混凝土支護體系是安全、穩(wěn)定且經(jīng)濟的初期支護新形式。
[Abstract]:As the main supporting structure of tunnel, initial support plays an important role in maintaining the stability of surrounding rock and controlling the deformation of surrounding rock. As a common initial support, bolting and shotcreting, with thin layer and weak strength, is difficult to improve the phenomenon of large deformation and difficult convergence in some loess tunnels. The insufficient bearing capacity of the initial support will bring safety hidden trouble to the construction and operation of the tunnel. Therefore, it is of practical significance to study the initial support of loess tunnel. According to the characteristics of loess tunnel support, this paper puts forward a concrete filled steel tube (CFST) supporting system, which is composed of concrete filled steel tube (CFST) and formwork concrete, which is used as the initial supporting system of loess tunnel. The purpose of this paper is to increase the bearing capacity by increasing the initial support thickness and stiffness, reduce the disturbance to the loess medium, preserve the natural strength of the surrounding rock to the maximum extent, and strictly control the deformation of the surrounding rock. In this paper, the cost economy, support effect, structural safety, deformation of surrounding rock and structural mechanical characteristics of concrete-filled steel tube support system under different construction methods are studied and analyzed by means of the method of assumed resistance and numerical calculation. By comparing and selecting the support system of concrete-filled steel tube and bolting and shotcreting support, the reasonable initial support form is obtained and evaluated from the aspects of cost economy and support effect. The lining internal force of concrete-filled steel tubular (CFST) support system is calculated by using the method of assumed resistance, and the safety of the structure is checked. The 3D simulation model is established by using MIDAS/GTS software. Aiming at the common construction methods (ring excavation with core soil method and CD method), the concrete filled steel tube (CFST) supporting system is taken as the object. The deformation of surrounding rock and the stress of supporting structure during construction are studied, and the spatial effect of mechanical behavior of surrounding rock and supporting structure is revealed. The results show that CFST support system is a safe, stable and economical new form of initial support.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455.7;U452.1

【參考文獻】

相關(guān)期刊論文 前10條

1 周燁;李鵬飛;張

本文編號：1797358