本文選題：黃土隧道 + 初期支護(hù)　； 參考：《長(zhǎng)安大學(xué)》2014年碩士論文

【摘要】：初期支護(hù)作為隧道的主要支護(hù)結(jié)構(gòu)，對(duì)維持圍巖穩(wěn)定、控制圍巖變形具有重要作用。錨噴支護(hù)作為常用的初期支護(hù)，噴層薄、強(qiáng)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(hù)承載能力的不足，將對(duì)隧道施工和運(yùn)營(yíng)帶來(lái)安全隱患。因此，針對(duì)黃土隧道初期支護(hù)展開(kāi)研究，具有現(xiàn)實(shí)意義。 本文針對(duì)黃土隧道支護(hù)特點(diǎn)，提出了鋼管混凝土支護(hù)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(hù)體系，作為黃土隧道的初期支護(hù)，旨在通過(guò)增大初支厚度和剛度提高承載能力，減小施工對(duì)黃土介質(zhì)的擾動(dòng)，最大程度的保存圍巖的天然強(qiáng)度，嚴(yán)格控制圍巖的變形。本文應(yīng)用假定抗力法及數(shù)值計(jì)算等方法，對(duì)鋼管混凝土支護(hù)體系的成本經(jīng)濟(jì)性，支護(hù)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(jìn)行了研究分析。 對(duì)鋼管混凝土支護(hù)體系和錨噴支護(hù)進(jìn)行比選，從成本經(jīng)濟(jì)性和支護(hù)效果兩方面進(jìn)行考慮，，得出較為合理的初支形式，并作出評(píng)價(jià)。 應(yīng)用假定抗力法，對(duì)鋼管混凝土支護(hù)體系的襯砌內(nèi)力進(jìn)行了計(jì)算，驗(yàn)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(duì)中斷面和大斷面黃土隧道的常用施工方法（環(huán)形開(kāi)挖留核心土法和CD法），以鋼管混凝土支護(hù)體系為對(duì)象，重點(diǎn)研究了施工過(guò)程中圍巖變形情況和支護(hù)結(jié)構(gòu)自身的受力情況，揭示了圍巖與支護(hù)結(jié)構(gòu)施工力學(xué)行為的空間效應(yīng)。 以上研究結(jié)果表明：鋼管混凝土支護(hù)體系是安全、穩(wěn)定且經(jīng)濟(jì)的初期支護(hù)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(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.7;U452.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 周燁;李鵬飛;張

本文編號(hào)：1797358