隧道四肢8字结格栅钢架优化试验研究
发布时间：2018-07-14 14:20
【摘要】：随着新奥法的普及,格栅钢架(Latticegirder)以其特有的优势在隧道及地下工程中的应用日益广泛。本文依托于修建中的蒙(西)华(中)煤运铁路隧道,对其单线H150型和双线H180型格栅钢架进行了 7种工况共计10个模型试验以及3段30m共计90m长的现场试验。对模型试验结构构件的变形规律、破坏形态和极限承载力进行了科学的理论分析,并在此基础上进行了 3种工况的现场试验,对试验段格栅钢架的受力情况、围岩收敛变形及围岩-初支接触压力进行监控量测,得出以下结论:1.格栅钢架的腹筋直径可优化为10mm,在保证承载能力的同时能控制工程成本,切实可行。2.围岩约束作用对提高初期支护承载能力非常有效,应在实际施工中保证围岩与初期支护密贴。3.单线隧道最佳受荷状态为围岩密贴情况下的拱部受荷,且单线隧道不适合应用于横向荷载大于竖向荷载的围岩地层中。4.现场试验中,标准设计、腹筋优化设计和综合优化设计格栅钢架均能在V级黄土围岩中与喷射混凝土形成有效的初期支护,维持围岩及隧道洞室的稳定。5.从钢架应力、围岩收敛变形和围岩-初支接触压力以及经济、人力及时间成本考虑,综合优化设计为所有设计工况中最优。6.格栅钢架初期支护的破坏是由混凝土极限强度控制的小偏心受压斜截面破坏,格栅钢架只在峰后混凝土退出工作时,保证结构的残余承载力,保证结构的完整性和延性。7.综合优化、腹筋优化及标准设计工况格栅钢架试验段混凝土与钢筋都尚有足够承载富余,可考虑进一步优化设计。
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U456
本文编号：2121921
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U456
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