【摘要】：隨著新奧法的普及,格柵鋼架(Latticegirder)以其特有的優(yōu)勢在隧道及地下工程中的應用日益廣泛。本文依托于修建中的蒙(西)華(中)煤運鐵路隧道,對其單線H150型和雙線H180型格柵鋼架進行了 7種工況共計10個模型試驗以及3段30m共計90m長的現(xiàn)場試驗。對模型試驗結構構件的變形規(guī)律、破壞形態(tài)和極限承載力進行了科學的理論分析,并在此基礎上進行了 3種工況的現(xiàn)場試驗,對試驗段格柵鋼架的受力情況、圍巖收斂變形及圍巖-初支接觸壓力進行監(jiān)控量測,得出以下結論:1.格柵鋼架的腹筋直徑可優(yōu)化為10mm,在保證承載能力的同時能控制工程成本,切實可行。2.圍巖約束作用對提高初期支護承載能力非常有效,應在實際施工中保證圍巖與初期支護密貼。3.單線隧道最佳受荷狀態(tài)為圍巖密貼情況下的拱部受荷,且單線隧道不適合應用于橫向荷載大于豎向荷載的圍巖地層中。4.現(xiàn)場試驗中,標準設計、腹筋優(yōu)化設計和綜合優(yōu)化設計格柵鋼架均能在V級黃土圍巖中與噴射混凝土形成有效的初期支護,維持圍巖及隧道洞室的穩(wěn)定。5.從鋼架應力、圍巖收斂變形和圍巖-初支接觸壓力以及經濟、人力及時間成本考慮,綜合優(yōu)化設計為所有設計工況中最優(yōu)。6.格柵鋼架初期支護的破壞是由混凝土極限強度控制的小偏心受壓斜截面破壞,格柵鋼架只在峰后混凝土退出工作時,保證結構的殘余承載力,保證結構的完整性和延性。7.綜合優(yōu)化、腹筋優(yōu)化及標準設計工況格柵鋼架試驗段混凝土與鋼筋都尚有足夠承載富余,可考慮進一步優(yōu)化設計。
[Abstract]:With the popularity of the New Austrian method, Latticegirder is widely used in tunnel and underground engineering with its unique advantages. Based on the construction of the Mongolian (West) Hua (Central) Coal Transport Railway Tunnel, this paper has carried out 10 model tests on the single line H150 and double line H180 grille steel frames, and 3 sections of 30m total 90m long field tests. In this paper, the deformation law, failure form and ultimate bearing capacity of structural members in model test are analyzed scientifically. On the basis of this, three field tests are carried out, and the stress of grille steel frame in test section is analyzed. The convergent deformation of surrounding rock and the contact pressure between surrounding rock and initial branch are monitored and measured, and the following conclusion is drawn: 1. The diameter of the web bar of the grille steel frame can be optimized to 10 mm, which can control the engineering cost while ensuring the carrying capacity. The constraint effect of surrounding rock is very effective to improve the bearing capacity of the initial support, and it should be ensured that the surrounding rock and the initial support are closely pasted. 3 in the actual construction. The best state of single line tunnel is the arch of surrounding rock, and the single line tunnel is not suitable for use in the surrounding rock stratum where the transverse load is greater than the vertical load. In the field test, the standard design, the optimization design of web bars and the comprehensive optimization design can all form effective initial support with shotcrete in V grade loess surrounding rock, and maintain the stability of surrounding rock and tunnel cavern. Considering the stress of steel frame, the convergent deformation of surrounding rock, the contact pressure between surrounding rock and initial support, and the cost of economy, manpower and time, the optimum design is the best. The initial support failure of grille steel frame is the failure of small eccentricity and inclined section controlled by the ultimate strength of concrete. The grille steel frame can guarantee the residual bearing capacity of the structure and the integrity and ductility of the structure only when the post-peak concrete exits from work. Comprehensive optimization, web reinforcement optimization and standard design conditions of grille steel frame test section of concrete and steel bar still have enough load surplus, we can consider further optimization design.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U456

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