發(fā)布時(shí)間：2019-03-25 21:00

【摘要】：本文依托于天平鐵路關(guān)山隧道圍巖變形破壞機(jī)理的科研項(xiàng)目,研究區(qū)的隧道圍巖以硬脆性巖體閃長(zhǎng)巖為主,隧道最大埋深831m,屬于典型的大埋深、高地應(yīng)力隧道圍巖變形破壞問(wèn)題。目前針對(duì)這種大埋深高地應(yīng)力隧道,開挖卸荷之后圍巖變形破壞機(jī)理及穩(wěn)定性的研究資料尚少,因此,本文旨在對(duì)大埋深高地應(yīng)力特殊工程地質(zhì)條件下圍巖變形破壞機(jī)理及穩(wěn)定性進(jìn)行研究,對(duì)實(shí)際工程的指導(dǎo)以及科學(xué)研究具有重要意義。本文在前人研究的基礎(chǔ)上,以現(xiàn)場(chǎng)工程地質(zhì)資料、現(xiàn)場(chǎng)實(shí)測(cè)的巖體結(jié)構(gòu)面統(tǒng)計(jì)資料、鉆孔電視實(shí)驗(yàn)數(shù)據(jù)、巖石力學(xué)實(shí)驗(yàn)數(shù)據(jù)為基礎(chǔ),采用定性解釋和定量分析相結(jié)合的思路對(duì)硬脆性巖體圍巖變形破壞機(jī)理及穩(wěn)定性進(jìn)行研究。詳細(xì)探討高埋深高地應(yīng)力隧道圍巖變形破壞模式,建立一套適用于高地應(yīng)力隧道圍巖分級(jí)方法,進(jìn)而對(duì)其穩(wěn)定性進(jìn)行分析評(píng)價(jià)。主要做了以下幾方面研究:(1)詳細(xì)分析研究區(qū)域隧道圍巖賦存環(huán)境的工程地質(zhì)條件,對(duì)隧道圍巖賦存環(huán)境條件有整體把握,為后續(xù)研究提供相關(guān)資料。(2)對(duì)隧道掌子面進(jìn)行巖體結(jié)構(gòu)面統(tǒng)計(jì),通過(guò)空間RQD值以及模量比隨荷載夾角變化的關(guān)系圖反應(yīng)巖體強(qiáng)烈的各向異性,巖體的各向異性導(dǎo)致應(yīng)力釋放后圍巖變形破壞模式不同。(3)塊體理論分析結(jié)構(gòu)面切割出的不穩(wěn)定塊體,分析圍巖變形破壞模式。(4)先后兩次觀測(cè)同一孔裂隙變化,分析應(yīng)力調(diào)整后圍巖變形破壞機(jī)理。(5)變圍壓試驗(yàn)分析應(yīng)力卸荷以及重新調(diào)整后的圍巖變形破壞機(jī)理。(6)利用Phase2有限元程序模擬不同支護(hù)條件下隧道的開挖效應(yīng),利用強(qiáng)度折減法計(jì)算SRF,從而對(duì)隧道圍巖穩(wěn)定性進(jìn)行綜合評(píng)價(jià)。通過(guò)以上幾方面的研究,我們認(rèn)識(shí)到大埋深、高地應(yīng)力隧道,開挖卸荷之后硬脆性巖體變疏松,之前被鎖固的結(jié)構(gòu)面張開,圍巖塊體沿張開的結(jié)構(gòu)面發(fā)生滑移坍塌破壞,導(dǎo)致部分洞段混凝土開裂,鋼拱架變形較為嚴(yán)重,但是經(jīng)過(guò)較強(qiáng)的初期支護(hù)后,隧道圍巖穩(wěn)定性較好,能夠滿足二次襯砌的要求,圍巖穩(wěn)定。
[Abstract]:This paper relies on the research project of deformation and failure mechanism of surrounding rock of Guanshan Tunnel of balance Railway. The surrounding rock of tunnel in the study area is mainly diorite of hard brittle rock, and the maximum buried depth of tunnel is 831m, which belongs to the typical large buried depth. Deformation and failure of surrounding rock of high in-situ stress tunnel. At present, there are few research data on deformation and failure mechanism and stability of surrounding rock after excavation and unloading for this kind of tunnel with large buried depth and high in-situ stress. The purpose of this paper is to study the deformation and failure mechanism and stability of surrounding rock under the special engineering geological conditions of large buried depth and high in-situ stress, which is of great significance to the guidance of practical engineering and scientific research. On the basis of previous research, this paper is based on the on-site engineering geological data, the statistical data of rock mass structure plane measured on the spot, the television experiment data of drilling holes, and the data of rock mechanics experiments. The mechanism and stability of deformation and failure of the surrounding rock mass of hard and brittle rock mass are studied by means of qualitative interpretation and quantitative analysis. The deformation and failure mode of surrounding rock of high buried depth and high ground stress tunnel is discussed in detail, and a set of classification methods for surrounding rock of high ground stress tunnel is established, and then the stability of surrounding rock is analyzed and evaluated. The main contents are as follows: (1) the engineering geological conditions of the surrounding rock of regional tunnel are analyzed in detail, and the environmental conditions of the surrounding rock of the tunnel are grasped as a whole. (2) the rock mass structure surface statistics are carried out, and the strong anisotropy of the rock mass is reflected by the spatial RQD value and the relationship diagram of the modulus ratio with the load angle. The anisotropy of rock mass leads to different modes of deformation and failure of surrounding rock after stress release. (3) the block theory is used to analyze the unstable block cut by structural plane, and the deformation and failure pattern of surrounding rock is analyzed. (4) the variation of the same hole crack is observed twice. The mechanism of deformation and failure of surrounding rock after stress adjustment is analyzed. (5) the deformation and failure mechanism of surrounding rock after stress unloading and re-adjustment is analyzed by variable confining pressure test. (6) the excavation effect of tunnel under different supporting conditions is simulated by Phase2 finite element program. The strength reduction method is used to calculate SRF, to evaluate the stability of surrounding rock of tunnel. Through the above research, we realize that the tunnel with large buried depth and high in-situ stress becomes looser after excavation and unloading, the previously locked structural plane opens, and the surrounding rock mass slips and collapses along the open structural plane. The steel arch frame deformation is serious, but after the strong initial support, the surrounding rock stability of the tunnel is better, which can meet the requirements of secondary lining, and the surrounding rock is stable.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U451.2

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