本文選題：小凈距 + 洞口　； 參考：《山東建筑大學(xué)》2015年碩士論文

【摘要】：山區(qū)城市修建隧道可以克服地形條件限制,有利于城市交通發(fā)展,但是城區(qū)隧道洞口段一般位于淺埋地帶,洞口覆蓋層相對(duì)比較薄,圍巖破碎且?jiàn)A有土層,地表土層甚至為雜填土。在此種圍巖條件下大斷面小凈距隧道洞口段存在以下問(wèn)題：臨時(shí)邊坡和仰坡容易失穩(wěn)破壞、圍巖不能靠自身的穩(wěn)定性成拱和加固措施的選擇等。針對(duì)以上問(wèn)題,本文依托濟(jì)南市石方峪隧道工程,主要研究工作有以下幾個(gè)方面：(1)研究洞口邊坡的穩(wěn)定性影響因素和破壞模式,針對(duì)邊坡破壞形式,總結(jié)邊坡處治的方案；并利用剛體極限平衡法計(jì)算邊坡的安全系數(shù)隨土力學(xué)參數(shù)的變化改變情況,研究確保隧道洞口長(zhǎng)大邊坡穩(wěn)定的加固方案。(2)根據(jù)石方峪隧道工程地質(zhì)特點(diǎn)和施工難點(diǎn),研究分析石方峪隧道邊坡、仰坡隱患及病害控制：①洞口高陡邊坡的加固措施,研究邊坡開(kāi)挖過(guò)程中的穩(wěn)定性：②仰坡開(kāi)裂病害,分析仰坡病害的成因與治理措施。(3)利用有限元MIDAS GTS模擬計(jì)算采用小凈距隧道中隔壁法和三臺(tái)階七步開(kāi)挖法的位移沉降和塑性區(qū)范圍,選擇適合城區(qū)淺埋隧道進(jìn)洞開(kāi)挖的施工方法,并根據(jù)模擬工況選擇加固方案。(4)通過(guò)在石方峪隧道的監(jiān)控量測(cè),獲取施工過(guò)程中的圍巖和支護(hù)體系的變化信息；分析洞口段監(jiān)控量測(cè)數(shù)據(jù),判斷石方峪隧道開(kāi)挖過(guò)程中需要重點(diǎn)監(jiān)控的時(shí)段,及時(shí)反饋分析。目前石方峪隧道工程已經(jīng)竣工,本文提出的關(guān)于石方峪隧道的施工方法和加固措施是合理的,取得了顯著的工程效果。
[Abstract]:The construction of tunnel in mountainous cities can overcome the limitation of topographic conditions and is beneficial to the development of urban traffic. However, the tunnel entrance section of urban tunnel is generally located in the shallow buried zone, with relatively thin overburden at the entrance of the tunnel, the surrounding rock is broken and there are soil layers in it. The surface soil layer is even mixed fill. Under the condition of this kind of surrounding rock, the following problems exist in large section and small clear distance tunnel entrance section: temporary slope and upside-slope are vulnerable to instability and failure, the surrounding rock can not be arched by its own stability and the choice of reinforcement measures, and so on. In view of the above problems, this paper relies on the Shifangyu tunnel project of Jinan city, the main research work has the following several aspects: 1) study the influence factor and the failure mode of the slope stability of the portal slope, summarizes the slope treatment plan in view of the slope failure form; And using rigid body limit equilibrium method to calculate the change of slope safety coefficient with soil mechanics parameters, and to study the reinforcement scheme to ensure the stability of long slope at tunnel entrance.) according to the engineering geological characteristics and construction difficulties of Shifangyu tunnel, The study and Analysis of the Slope of Shifangyu Tunnel, the hidden trouble and the disease control of the vertical slope, the reinforcement measures of the high and steep slope at the entrance of the Wei 1 tunnel, the stability of the slope during the excavation of the tunnel and the cracking disease of the upside-slope, Analysis of the causes and treatment measures of the disease of upside-slope. (3) using finite element MIDAS GTS to simulate and calculate the displacement settlement and plastic zone of the tunnel with small clear distance and three steps and seven steps excavation method. The construction method suitable for excavation of shallow buried tunnel in urban area is selected. According to the simulated working condition, the reinforcement scheme is selected. Through monitoring and measuring in Shifangyu tunnel, the change information of surrounding rock and supporting system in the construction process is obtained. The monitoring data of Dongkou section are analyzed, and the time period of key monitoring during excavation of Shifangyu tunnel is judged, and the timely feedback analysis is carried out. At present, Shifangyu tunnel project has been completed. The construction method and reinforcement measures of Shifangyu tunnel proposed in this paper are reasonable and have achieved remarkable engineering effect.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U455.4

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 袁富強(qiáng);三維極限平衡法研究與應(yīng)用[D];中國(guó)地質(zhì)大學(xué)（北京）;2011年

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本文編號(hào)：1918976