本文選題：非對稱小凈距隧道 + 隧道分類��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：在非對稱小凈距隧道進(jìn)行設(shè)計時,對隧道進(jìn)行深、淺埋的分界是計算圍巖垂直荷載的主要依據(jù);對非對稱小凈距隧道進(jìn)行影響分類可以為支護(hù)結(jié)構(gòu)的選取和支護(hù)結(jié)構(gòu)的施作時機(jī)提供重要的參考。然而目前,在此方面尚無成熟的理論和相關(guān)規(guī)范可供參考。此外,隨著水下隧道、海底隧道以及富水地層中地下鐵路的大量修建,滲流分析、流固耦合分析與不良地層的加固處理技術(shù)仍有待研究。首先,基于塌落拱理論和塑性區(qū)分析,對非對稱小凈距隧道的深、淺埋進(jìn)行了判定;確定了雙洞之間影響嚴(yán)重,應(yīng)當(dāng)盡量避免小于的最小凈距值;通過應(yīng)變能密度轉(zhuǎn)換規(guī)律的理論分析,給出了簡化的應(yīng)變能密度計算公式。綜合上述研究,提出了非對稱小凈距隧道的影響分類表。其次,通過有限元進(jìn)行數(shù)值模擬,研究了在各級圍巖情況下和采用不同開挖方式時,隧道襯砌結(jié)構(gòu)的變形和內(nèi)力情況,提出了優(yōu)化的開挖方法以及左右洞施工順序等。研究了注漿加固和對拉預(yù)應(yīng)力錨桿等對改善中巖墻穩(wěn)定性的作用,以及不同注漿加固范圍、預(yù)應(yīng)力錨桿的布設(shè)形式和各種加固手段的主要適用條件等。再次,通過滲流分析,模擬出降水條件和自然水面下隧道開挖后的滲流場的穩(wěn)態(tài)狀態(tài),研究了隧道開挖后滲流場的變化;通過理論公式和數(shù)值模擬對隧道內(nèi)涌水量進(jìn)行計算;通過流固耦合分析,研究掌子面前方的土體應(yīng)力場、位移場的變化規(guī)律,以及基于Coulomb失效準(zhǔn)則研究掌子面滲流對掌子面穩(wěn)定性的影響。最后,基于滲透原理和賓漢流體本構(gòu)模態(tài),建立了黏性漿液以恒定注漿速率在巖石裂隙中擴(kuò)散的理論模型,推導(dǎo)出了滲流模型和假定裂隙模型兩種模型的巖石裂隙漿液擴(kuò)散壓力場與滲流場隨時間和空間的計算公式,并利用數(shù)值模擬進(jìn)行了驗證。通過理論解析和數(shù)值模擬,研究了考慮流固耦合作用后不同注漿速度下注漿壓力、注漿半徑、裂隙率和滲透率隨時間的變化。
[Abstract]:In the design of asymmetric small clear distance tunnel, the deep and shallow boundary of tunnel is the main basis to calculate the vertical load of surrounding rock. The influence classification of asymmetric small spacing tunnel can provide an important reference for the selection of supporting structure and the timing of supporting structure. However, at present, there is no mature theory and relevant norms for reference. In addition, with the construction of underwater tunnel, undersea tunnel and underground railway in water-rich stratum, seepage analysis, fluid-structure coupling analysis and reinforcement of bad stratum are still to be studied. Firstly, based on the theory of collapse arch and the analysis of plastic zone, the depth and shallow burying of asymmetric small net distance tunnel are judged, and the influence between the two holes is serious, so the minimum net distance value should be avoided as far as possible. A simplified formula for calculating strain energy density is given through theoretical analysis of the transformation law of strain energy density. Based on the above research, a classification table of the effects of asymmetric small spacing tunnels is proposed. Secondly, the deformation and internal force of tunnel lining structure are studied under various surrounding rock conditions and different excavation methods by finite element method, and the optimized excavation method and construction sequence of left and right tunnels are put forward. The effects of grouting reinforcement and prestressed anchor rod on improving the stability of middle rock wall, as well as the different grouting reinforcement range, the layout of prestressed anchor rod and the main applicable conditions of various reinforcement methods are studied. Thirdly, through seepage analysis, the steady state of seepage field after tunnel excavation under natural water surface is simulated, the change of seepage field after tunnel excavation is studied, and the water inflow in tunnel is calculated by theoretical formula and numerical simulation. Through the fluid-solid coupling analysis, the variation law of soil stress field and displacement field in front of palm surface is studied, and the influence of percolation on the stability of palm surface is studied based on Coulomb failure criterion. Finally, based on the permeation principle and the constitutive mode of Bingham fluid, a theoretical model for the diffusion of viscous slurry in rock fractures at a constant grouting rate is established. The calculation formulas of diffusion pressure field and seepage field with time and space of rock fissure slurry in two models of seepage model and assumed fracture model are derived and verified by numerical simulation. Through theoretical analysis and numerical simulation, the variation of grouting pressure, grouting radius, fracture rate and permeability with time under different grouting velocities considering fluid-solid coupling is studied.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U455.4

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本文編號：1910273