本文選題：隧道加固 + 數(shù)值模型�。� 參考：《長安大學(xué)》2014年碩士論文

【摘要】：近年來我國公路行業(yè)迅猛發(fā)展，山區(qū)高速公路也越來越多，由于地形以及線路的限制，必然會出現(xiàn)大量的公路隧道。隧道洞口段作為整條隧道中最重要的一部分，由于其圍巖條件較差，需要施做預(yù)加固措施以保證隧道施工的安全進行。 本文依托寧波市花山隧道現(xiàn)場地質(zhì)條件，集成已有研究成果，建立數(shù)值模型，研究管棚和小導(dǎo)管的作用機理以及適用條件，并通過現(xiàn)場監(jiān)測資料對成果進行了驗證。主要研究內(nèi)容如下： 1.對管棚預(yù)加固方案鋼管的受力情況進行計算分析，分析鋼管內(nèi)力隨隧道開挖產(chǎn)生的變化規(guī)律，對小導(dǎo)管的自身加固原理和注漿加固原理進行研究，，并指出只有小導(dǎo)管和漿液達到最佳匹配時才能發(fā)揮出最好的支護效果。 2.通過MIDAS/GTS軟件建立三維有限元模型，對隧道洞口段分別處于不同埋深條件下，圍巖級別為Ⅴ級和Ⅳ級，采用管棚和小導(dǎo)管預(yù)加固時在隧道開挖過程中產(chǎn)生的圍巖應(yīng)力、塑性區(qū)和初期支護應(yīng)力進行分析，得出管棚和小導(dǎo)管都可以在一定程度上加固圍巖，但管棚的效果更好。 3.對管棚預(yù)加固和小導(dǎo)管預(yù)加固時隧道的拱頂沉降位移和地表沉降量進行分析，得出在圍巖條件較差的隧道洞口段最好采用管棚進行預(yù)加固。 4.通過依托工程隧道洞口段采用管棚預(yù)加固現(xiàn)場量測結(jié)果與數(shù)值模擬結(jié)果對比，分析表明本文研究成果具有一定的參考價值，可為軟弱圍巖隧道洞口段預(yù)加固措施的選擇提供一定參考。
[Abstract]:In recent years, with the rapid development of highway industry in China, there are more and more highways in mountainous areas. Due to the limitation of terrain and route, a large number of highway tunnels will inevitably appear. As the most important part of the whole tunnel, because of the poor surrounding rock conditions, pre-reinforcement measures are needed to ensure the safety of the tunnel construction. Based on the field geological conditions of Huashan Tunnel in Ningbo City, this paper integrates the existing research results, establishes a numerical model, studies the action mechanism and applicable conditions of the pipe shed and small conduit, and verifies the results through the field monitoring data. The main contents are as follows: 1. This paper calculates and analyzes the stress of the steel pipe in the prestrengthening scheme of pipe shed, analyzes the variation law of the internal force of the pipe with the tunnel excavation, and studies the reinforcement principle of the small pipe and the grouting reinforcement principle. It is pointed out that only when the small pipe and the slurry reach the best match can the best support effect be brought into play. The 3D finite element model was established by MIDAS-GTS software. The surrounding rock stress in tunnel excavation process was induced by pipe shed and small pipe pre-reinforcement under the condition of different buried depth, the surrounding rock grade was grade 鈪

本文編號：2106221