本文選題：隧道施工 + 穿越工程��； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：隨著時(shí)代的發(fā)展和城市化進(jìn)程的加速,國內(nèi)諸多城市興起修建地鐵的熱潮。城市地區(qū)建筑物密集,而進(jìn)行地鐵施工不可避免會(huì)對(duì)周邊地表建筑物造成影響,甚至?xí)沟媒ㄖ锇l(fā)生嚴(yán)重破壞,喪失使用功能。隧道穿越建筑物施工過程中,核心問題是隧道-土體-建筑物的動(dòng)態(tài)相互作用關(guān)系,研究三者之間的動(dòng)態(tài)相互作用機(jī)理,分析其動(dòng)態(tài)相互作用過程,對(duì)保護(hù)地表建筑物、確保施工全過程的安全性具有重要意義。本文采取隨機(jī)介質(zhì)理論、顆粒流分析、有限元分析等方法并結(jié)合工程案例,分析了隧道施工影響下隧道-地層-建筑物的動(dòng)態(tài)相互作用關(guān)系。主要工作和研究成果如下:(1)基于隨機(jī)介質(zhì)理論,編制MATLAB計(jì)算程序,分別計(jì)算了單線隧道與雙線隧道開挖作用下,考慮隧道埋深、開挖斷面大小、施工過程等不同影響因素對(duì)地表沉降變形規(guī)律的影響。采用PFC2D顆粒流分析軟件,分別建立有無地表建筑物存在時(shí)的顆粒流模型,從宏觀細(xì)觀相結(jié)合的角度分析隧道開挖影響下隧道-地層-建筑物動(dòng)態(tài)作用關(guān)系。分析認(rèn)為,隧道開挖地層變形是從隧洞周邊逐漸擴(kuò)散至地表的,建筑物的存在使得相互作用關(guān)系更為復(fù)雜。(2)采用有限元分析軟件ABAQUS,建立隧道-地層-建筑物相互作用的二維模型,建筑物與土體之間采用接觸連接模型,分析隧道開挖作用下三者之間的相互作用,并與沒有地表建筑物存在的情況相比較,分析相互作用關(guān)系的異同�？紤]不同的穿越關(guān)系,建筑物與地層之間在隧道埋深較淺的條件下會(huì)發(fā)生離層,采用接觸模型分析三者之間的相互作用關(guān)系更為準(zhǔn)確。(3)采用有限元分析軟件ABAQUS,建立隧道-地層-建筑物相互作用三維分析模型,分析不同工況下三者的相互作用關(guān)系,主要包括地質(zhì)參數(shù)、隧道穿越角度以及雙線隧道的不同開挖順序。分析表明,隧道-地層-建筑物的動(dòng)態(tài)作用關(guān)系體現(xiàn)在時(shí)空維度,不同開挖步序?qū)ㄖ镂灰苾?nèi)力造成不同的影響。(4)結(jié)合廈門機(jī)場路淺埋大跨隧道穿越密集建筑群工程實(shí)例,分析隧道施工中建筑物變形情況,主要分析了淺埋大跨進(jìn)口段34號(hào)樓的動(dòng)態(tài)變形過程,并對(duì)在實(shí)際工程施工中采取的控制地層沉降和建筑物保護(hù)措施進(jìn)行了分析,指出隧道施工是極其復(fù)雜的過程,影響因素眾多,需要確定主要影響因素并采取適當(dāng)?shù)目刂拼胧?br/>[Abstract]:With the development of the times and the acceleration of urbanization, many cities in our country are building subway. Buildings are dense in urban areas, and subway construction will inevitably affect the surrounding surface buildings, and even make the buildings seriously damaged and lose their function. In the construction process of tunneling through buildings, the key problem is the dynamic interaction between tunnel, soil and buildings. The dynamic interaction mechanism between them is studied, and the dynamic interaction process is analyzed to protect the surface buildings. It is of great significance to ensure the safety of the whole construction process. In this paper, the stochastic medium theory, particle flow analysis, finite element analysis and engineering cases are used to analyze the dynamic interaction between tunnel, stratum and building under the influence of tunnel construction. The main work and research results are as follows: (1) based on the stochastic medium theory, the MATLAB calculation program is compiled to calculate the excavation depth and section size of the tunnel under the action of single-line tunnel and double-line tunnel respectively. The influence of different factors such as construction process on the law of ground subsidence and deformation. In this paper, PFC2D particle flow analysis software is used to establish particle flow models with or without the existence of surface buildings. The dynamic relationship between tunnel, stratum and building under the influence of tunnel excavation is analyzed from the point of view of macroscopic and mesoscopic analysis. The analysis shows that the deformation of the tunnel is gradually diffused from the surrounding tunnel to the surface. The existence of buildings makes the interaction relationship more complex. (2) the finite element analysis software Abaqus is used to establish a two-dimensional model of the tunnel-soil-building interaction, and the contact connection model between the building and the soil is adopted. This paper analyzes the interaction between the three factors under the action of tunnel excavation, and compares with the situation that there is no surface building, and analyzes the similarities and differences of the interaction relationship. Considering different traversing relationships, there will be separation between the buildings and the strata under the condition of the shallow depth of the tunnel. The contact model is used to analyze the interaction between the three factors more accurately. The finite element analysis software Abaqus is used to establish the three-dimensional analysis model of tunnel-stratification and building interaction, and to analyze the interaction relationship between them under different working conditions. It mainly includes geological parameters, tunnel crossing angle and different excavation sequence of double-line tunnel. The analysis shows that the dynamic action relationship of tunnel, stratum and building is embodied in the dimension of time and space, and the different excavation steps have different influence on the internal force of the displacement of the building. 4) combined with the engineering example of Xiamen Airport Road shallow buried large span tunnel crossing through the dense building group. This paper analyzes the deformation of buildings in tunnel construction, mainly analyzes the dynamic deformation process of building No. 34 in the entrance section of shallow buried large span, and analyzes the measures taken to control ground subsidence and protect buildings in actual engineering construction. It is pointed out that tunnel construction is an extremely complex process, and there are many influencing factors, so it is necessary to determine the main influencing factors and take appropriate control measures.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U456

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本文編號(hào)：2021030