發(fā)布時間：2018-06-28 14:46

  本文選題：圍巖質(zhì)量 + 跨度　； 參考：《北京科技大學》2015年博士論文

【摘要】：山嶺隧道建設過程中,圍巖及支護結構失穩(wěn)是最為常見的工程災害。隧道一旦失穩(wěn),將造成巨大的損失。如何用更加科學的方法對隧道穩(wěn)定性進行評價,為隧道開挖及支護設計提供充分的理論依據(jù),保障隧道工程安全順利施工,是隧道建設者亟待解決的重大技術難題。 本文以“高速公路隧道開挖誘發(fā)工程災害辨識及預警系統(tǒng)研究”項目為依托,以山平高速鴛鴦會隧道深埋段為研究對象,綜合利用理論分析、數(shù)值模擬、監(jiān)控量測等技術手段,對復雜條件下深埋巖質(zhì)隧道穩(wěn)定性評價方法及應用開展研究,并取得以下主要研究成果： (1)眾所周知,巖體具有顯著的尺寸效應,但國內(nèi)外常用的巖體質(zhì)量評價及分類方法均未考慮工程巖體的尺寸效應,本論文為考慮這一重要因素,在圍巖基本質(zhì)量評價法的基礎上,引入跨度影響修正系數(shù),量化了跨度對隧道圍巖質(zhì)量的影響,實現(xiàn)了考慮圍巖尺寸效應的巖體質(zhì)量評價；基于粗糙集和未確知測度理論,建立了新的隧道圍巖質(zhì)量評價模型。利用兩種方法平行分級,相互驗證,可為研究復雜地質(zhì)條件下隧道穩(wěn)定性問題提供理論基礎。 (2)基于廣義Hoek-Brown屈服準則,建立了通用隧道縱向變形曲線計算模型�？紤]隧道圍巖質(zhì)量及應力水平對開挖面空間效應的影響,建立了能夠量化不同圍巖質(zhì)量及應力水平下開挖面空間效應差異的縱向變形曲線函數(shù)表達式,為正確應用收斂-約束法進行隧道開挖支護設計提供理論依據(jù)。 (3)結合圍巖質(zhì)量評價指標BQ值,以規(guī)范所給極限相對位移值域為基礎,參考大量隧道位移實測值及前人研究成果,建立了考慮多因素影響的初支極限相對位移模型,實現(xiàn)了初支極限相對位移連續(xù)化,為隧道初支結構安全評價提供了量化基礎。 (4)基于上述研究成果,提出并驗證了基于收斂-約束法的隧道開挖進尺優(yōu)化方法�；谑諗�-約束原理,以選定合理的開挖進尺為目標,以控制圍巖支護結構安全系數(shù)為手段,結合前文確定的隧道縱向變形曲線,反推支護起始作用位置,確定合理的開挖進尺。以鴛鴦會隧道左洞LK179+580-LK179+920區(qū)段為例,得出該區(qū)段中V類圍巖的合理開挖進尺為1.5m。
[Abstract]:In the process of mountain tunnel construction, the instability of surrounding rock and supporting structure is the most common engineering disaster. Once the tunnel is unstable, it will cause huge losses. How to evaluate the stability of tunnel by more scientific method, provide sufficient theoretical basis for tunnel excavation and support design, and ensure the safe and smooth construction of tunnel engineering, is a major technical problem to be solved urgently by tunnel builders. Based on the project of "disaster Identification and early warning system Research of Expressway Tunnel excavation induced Engineering", this paper takes the deep buried section of Shanping High-speed Yuanyang Yazhui Tunnel as the research object, and synthetically utilizes the technical means such as theoretical analysis, numerical simulation, monitoring and measurement, etc. The evaluation method and application of the stability of deep buried rock tunnel under complex conditions are studied. The main research results are as follows: (1) it is well known that rock mass has remarkable size effect. However, the size effect of engineering rock mass is not taken into account in the evaluation and classification of rock mass quality at home and abroad. In this paper, in order to consider this important factor, the span influence correction coefficient is introduced on the basis of the basic quality evaluation method of surrounding rock mass. The influence of span on the quality of surrounding rock mass of tunnel is quantified, and the evaluation of rock mass quality considering the size effect of surrounding rock mass is realized, and a new evaluation model of surrounding rock mass quality of tunnel is established based on rough set and unascertained measure theory. The parallel classification and mutual verification of the two methods can provide a theoretical basis for the study of tunnel stability under complex geological conditions. (2) based on the generalized Hoek-Brown yield criterion, a general tunnel longitudinal deformation curve calculation model is established. Considering the influence of surrounding rock mass and stress level on the spatial effect of excavation surface, the function expression of longitudinal deformation curve can be established to quantify the spatial effect difference of excavation face under different surrounding rock mass and stress level. It provides a theoretical basis for correctly applying the convergent constraint method to the design of tunnel excavation support. (3) combining with the value of the surrounding rock quality evaluation index, the value of the limit relative displacement value given by the code is taken as the foundation. Referring to a large number of tunnel displacement measurements and previous research results, the initial limit relative displacement model considering the influence of multiple factors is established, and the initial limit relative displacement continuity is realized. It provides a quantitative basis for the safety evaluation of tunnel initial branch structure. (4) based on the above research results, the paper proposes and verifies the optimization method of tunnel excavation scale based on convergent constraint method. Based on the principle of convergence and constraint, with the aim of selecting a reasonable excavation scale and controlling the safety factor of surrounding rock support structure, combining with the tunnel longitudinal deformation curve determined in the previous paper, the starting position of supporting is pushed back. Determine a reasonable excavation advance. Taking the LK179 580-LK179 920 section of the left tunnel of Yuanyanhui Tunnel as an example, the reasonable excavation scale of V type surrounding rock in this section is 1.5 m.
【學位授予單位】：北京科技大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：U451

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本文編號：2078329