本文選題：軟弱介質(zhì) + 劈裂擴(kuò)散理論模型��； 參考：《山東大學(xué)》2015年博士論文

【摘要】：隨著我國國民經(jīng)濟(jì)的快速發(fā)展,對礦產(chǎn)資源、水利資源及交通工程的需求日益增大,跨海隧道、公路隧道、深井礦山、城市地鐵等一大批地下工程投入建設(shè),地下工程建設(shè)正向地質(zhì)條件復(fù)雜多變,工程建設(shè)難度高的地域延伸和轉(zhuǎn)移。軟弱介質(zhì)充填斷層是地下工程建設(shè)中經(jīng)常遭遇的不良地質(zhì),在地下水及開挖應(yīng)力作用下,極易發(fā)生軟弱介質(zhì)的結(jié)構(gòu)破壞,形成導(dǎo)水通道和薄弱結(jié)構(gòu)面,引發(fā)突水突泥、坍塌失穩(wěn)及地表沉降等地質(zhì)災(zāi)害,是地下工程建設(shè)中的主要災(zāi)害源。注漿作為有效的治理方法,廣泛應(yīng)用于軟弱介質(zhì)充填斷層的災(zāi)害治理中,但是,受限于注漿工程的隱蔽性與被注介質(zhì)的各向異性,漿液與被注巖土體之間的相互作用過程極其復(fù)雜,注漿理論的研究遠(yuǎn)遠(yuǎn)滯后于工程實踐,亟需深入研究。本文采用理論分析、模型試驗、數(shù)值模擬和現(xiàn)場試驗相結(jié)合的研究方法,選取典型軟弱介質(zhì)土體為研究對象,基于非線性壓縮模型,研究了注漿擴(kuò)散加固機(jī)理,通過試驗與數(shù)理分析方法建立了注漿加固前后土體力學(xué)及滲透性能的定量關(guān)系；在此基礎(chǔ)上分析了地下工程注漿加固前后穩(wěn)定性,建立分段梯次增壓復(fù)合式注漿方法,并在依托工程成功應(yīng)用,取得了一系列研究成果。(1)根據(jù)介質(zhì)物理結(jié)構(gòu)特征的不同對斷層充填介質(zhì)進(jìn)行了分類,研究了不同類型介質(zhì)的擴(kuò)散及加固模式,揭示了注漿擴(kuò)散發(fā)生條件及加固作用過程,獲得了可描述注漿加固效果的主要指標(biāo)參數(shù)。(2)基于土體非線性壓縮模型,并考慮劈裂注漿過程中漿液流場與土體應(yīng)力場的耦合作用,建立了劈裂注漿擴(kuò)散理論模型,獲得了劈裂通道寬度的空間分布方程,分析了注漿壓力、劈裂通道寬度、漿液擴(kuò)散半徑三者之間的關(guān)系。將土體壓縮模量、土體孔隙率、土體滲透率作為注漿效果評價指標(biāo),提出了注漿有效加固半徑及劈裂注漿參數(shù)的確定方法。(3)自主研發(fā)了一套大比例三維斷層軟弱充填介質(zhì)注漿模型試驗系統(tǒng),可還原軟弱介質(zhì)真實注漿環(huán)境,開展了分段注漿模擬試驗,并實時監(jiān)測注漿過程多元信息。研究了軟弱介質(zhì)中注漿擴(kuò)散過程,獲得注漿擴(kuò)散不同階段注漿壓力及速率的變化特征和漿液擴(kuò)散過程中壓力場時空演化規(guī)律,揭示了分段注漿擴(kuò)散加固機(jī)理。通過開挖揭露和取樣測試,分析了漿脈厚度變化及空間分布特征,建立了試驗條件下注漿加固前后力學(xué)參數(shù)及滲透系數(shù)的定量關(guān)系。(4)基于上述定量關(guān)系,采用流固耦合理論建立地下工程開挖的有限元模型,對比分析注漿前后巖土體穩(wěn)定性及涌水量,對注漿加固參數(shù)選擇方法進(jìn)行了驗證。(5)建立了分段梯次增壓復(fù)合式注漿方法,闡述了復(fù)合注漿技術(shù)的原理及設(shè)計方法。研究成果在南京地鐵上元門車站臨江破碎帶注漿加固工程成功應(yīng)用,取得了良好的治理效果,可為類似工程提供借鑒,具有廣闊的應(yīng)用前景。
[Abstract]:With the rapid development of China's national economy, the demand for mineral resources, water resources and transportation projects is increasing day by day. A large number of underground projects, such as cross-sea tunnels, highway tunnels, deep well mines, urban subways, etc., have been put into construction. The geological conditions of underground engineering construction are complex and changeable, and the construction of underground engineering is difficult to extend and transfer. The fault filled with weak medium is often encountered in bad geology in underground engineering construction. Under the action of groundwater and excavation stress, it is easy to occur structural damage of weak medium, forming water conduction channel and weak structural surface, and causing water inrush and mud inrush. Collapse instability and surface subsidence are the main disaster sources in underground engineering construction. As an effective treatment method, grouting is widely used in disaster control of fault filled with weak medium, but limited by the concealment of grouting engineering and anisotropy of injected medium. The process of interaction between grouting and injected rock is extremely complex, and the research of grouting theory lags far behind engineering practice. In this paper, theoretical analysis, model test, numerical simulation and field test are used to study the mechanism of grouting diffusion reinforcement based on nonlinear compression model. The quantitative relationship of soil mechanics and permeability before and after grouting reinforcement is established by means of test and mathematical analysis, and the stability of underground engineering before and after grouting reinforcement is analyzed, and the composite grouting method of step by step pressurization is established. Based on the successful application of the project, a series of research results have been obtained. (1) according to the different characteristics of the physical structure of the medium, the fault filling media has been classified, and the diffusion and reinforcement modes of the different types of media have been studied. In this paper, the conditions of grouting diffusion and reinforcement process are revealed, and the main parameter of grouting reinforcement effect is obtained. Based on the nonlinear compression model of soil, the coupling effect of slurry flow field and soil stress field is considered in the process of splitting grouting. A theoretical model of split grouting diffusion is established, and the spatial distribution equation of split channel width is obtained. The relationship among grouting pressure, split channel width and slurry diffusion radius is analyzed. The compression modulus, porosity and permeability of soil are taken as the evaluation indexes of grouting effect. The method of determining the effective reinforcement radius and the parameters of splitting grouting is put forward. A set of large scale 3D fault grouting model test system for soft filling medium is developed, which can reduce the real grouting environment of weak medium. Segmented grouting simulation test was carried out, and multi-information of grouting process was monitored in real time. The process of grouting diffusion in soft medium is studied. The variation characteristics of grouting pressure and rate in different stages of grouting diffusion and the space-time evolution law of pressure field in grouting diffusion process are obtained, and the mechanism of grouting diffusion reinforcement is revealed. Through excavation exposure and sampling test, the variation and spatial distribution characteristics of grouting vein thickness are analyzed, and the quantitative relationship between mechanical parameters and permeability coefficient before and after grouting reinforcement under test conditions is established. The finite element model of underground engineering excavation is established by using fluid-solid coupling theory. The stability and water inflow of rock and soil before and after grouting are compared and analyzed. The selection method of grouting reinforcement parameters is verified. The principle and design method of compound grouting technology are described. The research results have been successfully applied in the grouting reinforcement project of the breakage zone near the river of Shangyuanmen Station of Nanjing Metro, and good treatment effect has been obtained, which can be used as a reference for similar projects and has a broad application prospect.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU472;TU94

【引證文獻(xiàn)】

相關(guān)會議論文 前2條

1 W.H.Baker;郭玉花;;以壓密灌漿加固已建土石壩壩基[A];現(xiàn)代灌漿技術(shù)譯文集[C];1991年

2 W.Wittke;張金接;;采用膏狀稠水泥漿灌漿新技術(shù)[A];現(xiàn)代灌漿技術(shù)譯文集[C];1991年

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本文編號：2017443