本文選題：淤泥 + 地層穩(wěn)定��； 參考：《中南大學(xué)》2014年博士論文

【摘要】：摘要：如何確保淤泥質(zhì)地層中的地下工程施工安全是工程界迫切需要解決的技術(shù)難題。本文針對(duì)淤泥質(zhì)地層地下通道暗挖施工技術(shù),依托多個(gè)市區(qū)地下人行通道工程實(shí)例,采用理論分析、數(shù)值模擬和現(xiàn)場(chǎng)工程驗(yàn)證等手段進(jìn)行研究,提出了淤泥質(zhì)地層改良加固方案及施工工藝并在現(xiàn)場(chǎng)得到檢驗(yàn),主要內(nèi)容如下： (1)通過(guò)文獻(xiàn)調(diào)研總結(jié)了我國(guó)城市淤泥質(zhì)地層分布特征,分析了淤泥質(zhì)地層的工程特性及在該地層進(jìn)行暗挖隧道施工難點(diǎn)。 (2)采用風(fēng)險(xiǎn)管理手段建立了淤泥質(zhì)地層地下通道暗挖施工風(fēng)險(xiǎn)評(píng)估模型,進(jìn)行了相應(yīng)的風(fēng)險(xiǎn)分析,揭示了風(fēng)險(xiǎn)源,提出了施工風(fēng)險(xiǎn)控制措施。 (3)擴(kuò)展應(yīng)用巖土工程穩(wěn)定性分析的極限分析上限有限元法,展開(kāi)多種參數(shù)條件下的地層穩(wěn)定性分析,探討了加固圈厚度和加固參數(shù)等因素對(duì)隧道橫斷面穩(wěn)定性的影響,獲得了暗挖隧道地層失穩(wěn)破壞特征,論證了包含加固圈的淤泥質(zhì)地層暗挖隧道穩(wěn)定性、破壞規(guī)律和加固機(jī)理,提出了地層注漿加固建議。 (4)在淤泥質(zhì)地層工程特性及暗挖隧道地層失穩(wěn)破壞特征研究基礎(chǔ)上,分析現(xiàn)有的地層加固改良方法的具體特征,明確各種地層加固改良方法的適用條件。 (5)以多個(gè)典型的淤泥質(zhì)地層地下通道工程現(xiàn)場(chǎng)實(shí)例為依托,分別采用上限有限元法和有限差分法數(shù)值計(jì)算手段,分析了暗挖通道地層穩(wěn)定性和結(jié)構(gòu)變形與安全性。從施工角度討論了工程外部環(huán)境條件、淤泥質(zhì)地層具體特性、以及暗挖工法的實(shí)施難點(diǎn),在工程現(xiàn)場(chǎng)實(shí)施并檢驗(yàn)以WSS注漿為主、TSS注漿為輔、并結(jié)合拱部大管棚的綜合地層預(yù)加固方案及施工工藝。圖127幅,表72個(gè),參考文獻(xiàn)147篇。
[Abstract]:Absrtact: how to ensure the construction safety of underground engineering in silt layer is an urgent technical problem in engineering field. In this paper, based on many practical examples of underground pedestrian passage in urban area, theoretical analysis, numerical simulation and field engineering verification are used to study the construction technology of underground tunnel in silt layer. The improvement and reinforcement scheme and construction technology of silt texture layer are put forward and tested in the field. The main contents are as follows: 1) the distribution characteristics of silt texture layer in cities of China are summarized through literature investigation. This paper analyzes the engineering characteristics of silt texture layer and the difficulties of tunneling construction in this stratum. (2) risk assessment model for underground tunnel excavation of silt layer is established by means of risk management, and the corresponding risk analysis is carried out. The risk source is revealed and the construction risk control measures are put forward. The upper limit finite element method of limit analysis for stability analysis of geotechnical engineering is extended to analyze the formation stability under various parameters. In this paper, the influence of the thickness of reinforcement ring and reinforcement parameters on the stability of tunnel cross section is discussed. The failure characteristics of undercut tunnel strata are obtained, and the stability, failure law and reinforcement mechanism of silt layer with silt texture including reinforcement ring are demonstrated. On the basis of the study on the engineering characteristics of silt layer and the failure characteristics of undercut tunnel strata, the concrete characteristics of the existing methods of stratum reinforcement and improvement are analyzed. Based on several typical examples of underground tunnel engineering in silt layer, the upper limit finite element method and finite difference method are used to calculate numerical value respectively. The stability, structural deformation and safety of undercut tunnel strata are analyzed. From the point of view of construction, this paper discusses the external environmental conditions of the project, the concrete characteristics of the silt texture layer, and the difficulties in the implementation of the underground excavation method. Combined with the arch pipe shed comprehensive stratum pre-reinforcement scheme and construction technology. 127 figures, 72 tables, 147 references.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU714;TU94

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本文編號(hào)：2023375