本文選題：軟弱地層 + 群樁效應(yīng)��； 參考：《西南交通大學(xué)》2016年碩士論文

【摘要】：目前,隨著城市經(jīng)濟建設(shè)的迅猛發(fā)展,高速客專也隨之進入飛速發(fā)展階段,其中包含較高比例的隧道,由于高速列車的通過性要求高,當(dāng)隧道處于軟弱地層中時,其基底處理面臨巨大挑戰(zhàn)。本文依托于龍洞堡國際機場下穿高速鐵路工程,對隧道基底深厚軟弱地層處理技術(shù)進行研究,獲得以下主要研究成果：(1)闡述了軟弱地層隧道的基本力學(xué)特征,研究對比了各種軟弱地層隧道施工方法及基地加固方式,選用了群樁與襯砌支護聯(lián)合承載體系改良地基,并闡述了群樁力學(xué)效應(yīng)及承載性能。(2)通過建立三維有無地基改良模型,研究對比地基改良前后不同開挖步隧道結(jié)構(gòu)的沉降、應(yīng)力情況,得到了開挖過程中隧道洞室力學(xué)行為的變化情況,揭示了地基群樁改良對控制隧道沉降及保證列車運行安全的有效性。(3)通過建立三維數(shù)值模型,研究群樁與襯砌聯(lián)合承載體系中群樁在不同樁長、樁徑、橫向間距、縱向間距下襯砌、圍巖的受力及變形分布情況,并在此基礎(chǔ)上對隧道群樁-襯砌聯(lián)合承載體系進行優(yōu)化設(shè)計,揭示了在不同群樁設(shè)計參數(shù)下對隧道結(jié)構(gòu)的影響規(guī)律。(4)基于群樁與襯砌聯(lián)合承載體系優(yōu)化設(shè)計模型,擬合出不同樁基設(shè)計參數(shù)(樁長、樁徑、樁基橫距、樁基縱距)下群樁的受力模型計算公式,可極大簡化隧底群樁的工程設(shè)計。(5)通過在輪軸對上施加振動力時程曲線,并對列車施加列車前進方向的行駛速度場,可以模擬振動荷載的大小和位置變化,從而可以較為精確地模擬隧道結(jié)構(gòu)動力響應(yīng)隨列車行駛速度和位置的發(fā)展變化,揭示出群樁基底對控制列車振動效應(yīng)有顯著作用。
[Abstract]:At present, with the rapid development of urban economic construction, high-speed passenger specialized has also entered the rapid development stage, including a higher proportion of tunnels, because of the high speed train passing requirements, when the tunnel is in the weak stratum, Its base treatment faces great challenges. In this paper, based on the high-speed railway project under Longdongbao International Airport, the deep soft stratum treatment technology of the tunnel basement is studied, and the following main research results are obtained: 1) the basic mechanical characteristics of the soft stratum tunnel are expounded. This paper studies and compares various construction methods and base reinforcement methods of tunnels in soft strata, selects the combined bearing system of pile group and lining support to improve the foundation, and expounds the mechanical effect and bearing capacity of pile groups. By studying and comparing the settlement and stress of tunnel structures with different excavation steps before and after foundation improvement, the variation of mechanical behavior of tunnel caverns during excavation is obtained. This paper reveals the effectiveness of foundation pile group improvement in controlling tunnel settlement and ensuring the safety of train operation. Through the establishment of three-dimensional numerical model, the paper studies the pile group in different pile length, pile diameter and transverse spacing in the combined bearing system of pile group and lining. On the basis of the stress and deformation distribution of the lining and surrounding rock under the longitudinal spacing, the optimum design of the combined bearing system of the tunnel pile group and lining is carried out. The influence of different pile group design parameters on tunnel structure is revealed. Based on the optimal design model of combined bearing system of pile group and lining, different design parameters of pile foundation (pile length, pile diameter, transverse distance of pile foundation) are fitted. The calculation formula of the force model of pile group under the longitudinal distance of pile foundation can greatly simplify the engineering design of pile group at the bottom of the tunnel by applying the vibration force time history curve on the wheel shaft pair and applying the speed field of the train forward direction to the train. The variation of vibration load and position can be simulated, and the dynamic response of tunnel structure can be accurately simulated with the development of train speed and position. It is revealed that pile group foundation plays a significant role in the control of train vibration effect.
【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】：2016
【分類號】：U455.49

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