本文選題：公路隧道 + 偏壓淺埋�。� 參考：《廣西大學》2017年碩士論文

【摘要】：通過長期的地下結構支護實踐,科研人員發(fā)現(xiàn)隧道周圍一定范圍內的圍巖具有自承能力和自穩(wěn)性,即自然平衡現(xiàn)象。實踐證明隧道圍巖在一定狀態(tài)下是可以自穩(wěn)的�，F(xiàn)行公路隧道實際工程情況復雜多變,由于現(xiàn)階段圍巖分級的單個級別跨度比較大,對圍巖的穩(wěn)定性把握不夠精細,圍巖實際狀況了解不夠全面,導致隧道設計和施工的方案比較保守。因此,圍巖的穩(wěn)定性方面存在細化的空間,需要把握好圍巖數(shù)據(jù)的準確性,方可科學地把握和設計整個隧道工程�？紤]國內外對圍巖的穩(wěn)定性研究方向較多,因此本文在分析圍巖穩(wěn)定性時,著重考慮目前影響隧道工程中的重要因素。實際工程中,許多公路隧道受到淺埋和偏壓的影響較大,為更準確地了解圍巖的實際狀況,本文依托廣西南寧玉象隧道,考慮采用埋深和偏壓兩個指標,用數(shù)值模擬的方法模擬隧道開挖后毛洞的穩(wěn)定性,通過穩(wěn)定性結果對圍巖進行分級,即自穩(wěn)性分級。在此基礎上,用數(shù)值模擬的方法針對不同自穩(wěn)等級圍巖提出對應的優(yōu)化初期支護方案,并通過實際施工監(jiān)測數(shù)據(jù)進行對比和驗證。根據(jù)圍巖穩(wěn)定性分級進而相應地優(yōu)化隧道設計,節(jié)約資源和降低建設成本。研究結果表明,根據(jù)埋深和偏壓角度兩個指標,可將該隧道的自穩(wěn)性劃分為三個級別,并根據(jù)這三個等級,進而對隧道初期支護方案進行優(yōu)化,其中,在優(yōu)化方案中,將材料的用量和參數(shù)如濕噴混凝土的厚度優(yōu)化為20cm～50cm厚,錨桿為2m～5m,鋼拱架將22號工字鋼改為18號工字鋼。實際監(jiān)控測量數(shù)據(jù)與優(yōu)化方案的模擬數(shù)據(jù)較接近,因此,優(yōu)化方案是可行的。在安全施工的前提下,對初期支護的優(yōu)化取得—定的效果。研究結果對類似受到淺埋偏壓影響隧道的初期支護設計和施工具有參考價值。
[Abstract]:Through the long-term practice of underground structure support, the researchers found that the surrounding rock around the tunnel has self-supporting capacity and self-stability, that is, natural balance phenomenon. Practice has proved that the surrounding rock of the tunnel can be self-stable in a certain state. The actual engineering situation of current highway tunnel is complex and changeable. Since the single grade span of surrounding rock classification is relatively large at present, the stability of surrounding rock is not well grasped, and the actual condition of surrounding rock is not fully understood. The scheme of tunnel design and construction is conservative. Therefore, there is a fine space for the stability of surrounding rock, so it is necessary to grasp the accuracy of surrounding rock data in order to scientifically grasp and design the whole tunnel project. Considering that there are many research directions on the stability of surrounding rock at home and abroad, this paper focuses on the important factors that affect the stability of surrounding rock in tunnel engineering. In actual engineering, many highway tunnels are greatly affected by shallow burying and bias pressure. In order to understand the actual condition of surrounding rock more accurately, this paper, relying on Nanning Jade Xiang Tunnel in Guangxi, considers adopting two indexes of buried depth and bias pressure. The stability of the tunnel after excavation is simulated by numerical simulation, and the stability of surrounding rock is classified by the stability results, that is, self-stability classification. On this basis, the numerical simulation method is used to propose the corresponding initial support scheme for the surrounding rock of different self-stability grade, and the comparison and verification are carried out through the actual construction monitoring data. According to the classification of surrounding rock stability, the tunnel design is optimized accordingly, which saves resources and reduces construction cost. The results show that according to the two indexes of buried depth and bias angle, the self-stability of the tunnel can be divided into three levels, and according to these three grades, the initial support scheme of the tunnel can be optimized, among which, in the optimization scheme, The material content and parameters such as the thickness of wet shotcreting concrete are optimized to be 20cm~50cm thickness, the anchor rod is 2 mand 5 m, and the steel arch frame is changed from 22 I-steel to 18 I-beam steel. The actual monitoring and measurement data are close to the simulation data of the optimization scheme, so the optimization scheme is feasible. In the premise of safe construction, the initial support optimization achieved-fixed results. The results are valuable for the initial support design and construction of tunnels affected by shallow bias voltage.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U451.2

【參考文獻】

相關期刊論文 前10條

1 江杰;劉剛伯;蒲鷗;歐孝奪;趙建剛;謝規(guī)球;;淺埋偏壓大斷面隧道施工力學分析及方案比選[J];山西建筑;2016年18期

2 孫輝;蘇永華;梁斌;;基于強度折減法的圍巖自穩(wěn)能力量化方法[J];水文地質工程地質;2016年03期

3 王明年;童建軍;劉大剛;于麗;張沖;;高巖溫鐵路隧道支護結構體系分級研究[J];土木工程學報;2015年11期

4 李文強;孫雅潔;李宏濤;;某山區(qū)公路巖質岸坡變形破壞模式及自穩(wěn)性分析[J];黑龍江交通科技;2015年07期

5 張濤;;地鐵隧道初期支護參數(shù)優(yōu)化研究[J];隧道建設;2014年10期

6 魏綱;;基坑開挖對下方既有盾構隧道影響的實測與分析[J];巖土力學;2013年05期

7 周宗青;李術才;李利平;石少帥;宋曙光;王凱;;巖溶隧道突涌水危險性評價的屬性識別模型及其工程應用[J];巖土力學;2013年03期

8 張偉;惠興田;;基于自穩(wěn)隱形拱理論的巷幫穩(wěn)定性分析[J];煤炭技術;2013年01期

9 劉印;張冬梅;黃宏偉;;盾構隧道局部長期滲水對隧道變形及地表沉降的影響分析[J];巖土力學;2013年01期

10 李寧;殷宏;許繼恒;邱國慶;解文彬;;基于BP神經網(wǎng)絡的掌子面前方圍巖自穩(wěn)能力評估[J];兵工自動化;2012年07期

相關博士學位論文 前1條

1 賈劍青;復雜條件下隧道支護體時效可靠性及風險管理研究[D];重慶大學;2006年

，

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