本文關鍵詞： 新意法 掌子面擠出 超前核心土 軟巖大變形 數(shù)值模擬　出處：《西南交通大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著經(jīng)濟的發(fā)展,人口的不斷加速增長及城市規(guī)模的發(fā)展,人類的生存環(huán)境持續(xù)發(fā)生改變,資源利用過度,呈缺乏之勢,城市人口增多,人均生存空間減少,交通擁堵,生態(tài)失衡和環(huán)境惡化等問題對世界經(jīng)濟人文的發(fā)展影響越來越惡劣。為此,世界各國政府為了促進社會和經(jīng)濟的發(fā)展,解決城市擁擠的問題,逐步開始將城市建設向地下發(fā)展,規(guī)劃建設了一大批地下工程。自新中國成立以來,我國隧道建設已經(jīng)取得了驕人的成績,令世界矚目。 新意法是意大利著名學者Pietro Lunardi先生歷經(jīng)多年的探索與實踐并在前人理論基礎上創(chuàng)立的,又稱為巖土控制變形分析法。該工法針對隧道變形反應的真正起因,提出了一整套理論分析方法和實際工程措施。特別是在軟弱破碎地質條件下,通過采取預約束和約束措施加固掌子面—超前核心土和隧道圍巖,能夠實現(xiàn)全斷面掘進施工,具有安全、高效、控制工期和費用的優(yōu)勢。 本文以蘭新高鐵第二雙線大梁隧道為工程背景,針對高地應力條件下軟巖隧道施工過程中存在的掌子面擠出問題,主要完成以下幾個方面問題的研究： 1.掌子面擠出做為軟巖大變形的主要表現(xiàn)形式之一,要研究掌子面擠出發(fā)生的機理首先要明確軟巖大變形的發(fā)生機理,本文從軟巖的定義、軟巖大變形的特性及大變形的機理三方面闡述掌子面擠出發(fā)生的機理；同時,為了在施工過程中及時有效的預報掌子面是否發(fā)生失穩(wěn)現(xiàn)象,本文提出了簡單易用的掌子面擠出預測方法,為現(xiàn)場施工人員及時發(fā)現(xiàn)掌子面失穩(wěn)并采取控制措施提供方法。 2.本論文在第二章部分提出了控制掌子面擠出變形的施工技術,并結合在大梁隧道做得現(xiàn)場試驗,通過對比試驗結果,比較分析了部分掌子面支護技術對掌子面擠出控制效果,得出了控制掌子面擠出的有效方法；同時,本章內容還提出了掌子面擠出變形的監(jiān)控量測方法,得到了擠出變形值與掌子面圍巖破壞狀況之間的關系,為指導施工提供依據(jù)。 3.最后,本論文利用大型通用有限差分軟件FLAC3D對大梁隧道采用的幾種施工工法引起的掌子面擠出變形進行數(shù)值模擬,通過對比分析不同施工工法條件下,大梁隧道掌子面的擠出位移值,得出可以有效控制掌子面擠出的施工工法,為擠出性圍巖隧道的施工提供依據(jù)。
[Abstract]:With the development of economy, the accelerating growth of population and the development of city scale, the living environment of human beings has been changed continuously, the resources are overutilized, and the urban population is increasing, and the living space per capita is decreasing. Problems such as traffic congestion, ecological imbalance and environmental deterioration have more and more bad effects on the development of human culture in the world economy. Therefore, in order to promote social and economic development, governments around the world solve the problem of urban congestion. A large number of underground projects have been planned and constructed gradually. Since the founding of New China, the tunnel construction in our country has made remarkable achievements and attracted the attention of the world. The new idea method was founded by Mr. Pietro Lunardi, a famous Italian scholar, after many years of exploration and practice and on the basis of previous theories. This method is also called geotechnical control deformation analysis method. Aiming at the real cause of tunnel deformation response, this method puts forward a whole set of theoretical analysis methods and practical engineering measures, especially under the weak broken geological conditions. By taking pre-restraint and restraint measures to strengthen the face of the face, the core soil ahead of the tunnel and the surrounding rock of the tunnel, the full section excavation construction can be realized, which has the advantages of safety, high efficiency, control of time limit and cost. In this paper, based on the second double-track large beam tunnel of Lanxin high-speed railway as the engineering background, aiming at the extrusion problem of the face of the soft rock tunnel during the construction of soft rock tunnel under the condition of high in-situ stress, the following aspects are mainly studied: 1. As one of the main forms of large deformation of soft rock, the mechanism of large deformation of soft rock must be defined in this paper in order to study the mechanism of extrusion. The characteristics of large deformation of soft rock and the mechanism of large deformation are discussed in this paper. At the same time, in order to predict the instability of the face in time and effectively in the construction process, this paper puts forward a simple and easy to use method of extrusion prediction of the face of the palm. Provide methods for site construction workers to find out the face instability and take control measures in time. 2. In the second part of this paper, the construction technology of controlling the extrusion deformation of the face of the palm is put forward, and combined with the field test in the beam tunnel, the results of the test are compared. This paper compares and analyzes the control effect of partial face support technology on the extrusion of the face of the palm, and obtains the effective method of controlling the extrusion of the face of the palm. At the same time, this chapter also puts forward the method of monitoring and measuring the extrusion deformation of the face, and obtains the relationship between the value of the extrusion deformation and the failure of surrounding rock of the face of the palm, which provides the basis for guiding the construction. 3. Finally, the numerical simulation of the extrusion deformation caused by several construction methods of beam tunnel is carried out by using the large scale finite difference software FLAC3D. By comparing and analyzing the extrusion displacement of the face of beam tunnel under different construction methods, the construction method which can effectively control the extrusion of the face of the tunnel is obtained, which provides the basis for the construction of the extruded surrounding rock tunnel.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U451;U455.49

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