本文選題：公路隧道 + 軟弱黃土��； 參考：《長(zhǎng)安大學(xué)》2015年碩士論文

【摘要】：軟弱黃土公路隧道的受力變形一直是學(xué)術(shù)界和工程界比較關(guān)注的問(wèn)題。由于黃土特殊的工程性質(zhì),黃土公路隧道隧底的受力變形特征也與其它山嶺隧道有著很大的不同。為了能充分認(rèn)識(shí)黃土公路隧道隧底的受力與變形特征,以便提出有效的基底加固措施。本文以付家窯隧道為依托,運(yùn)用有限元軟件、結(jié)合現(xiàn)場(chǎng)實(shí)測(cè)等手段分析研究淺埋條件下隧道基底樁體及樁間土的受力與變形規(guī)律。主要工作如下:1、根據(jù)付家窯隧道現(xiàn)場(chǎng)測(cè)試結(jié)果,分析淺埋條件下扁平大斷面三車(chē)道黃土隧道邊墻壓力、基底圍巖壓力和附加應(yīng)力的大小隨時(shí)間的變化規(guī)律,得到隧道基底圍巖應(yīng)力分布特征。2、運(yùn)用MIDAS/GTS有限元軟件,以依托工程為背景,對(duì)隧底未處理?xiàng)l件下隧道施工過(guò)程進(jìn)行二維數(shù)值模擬。分析隧道基底圍巖壓力的分布規(guī)律、隧道開(kāi)挖過(guò)程中豎向位移和水平向位移的變化趨勢(shì)以及隧底圍巖塑性區(qū)的分布特征。3、對(duì)采用灰土擠密樁處理后隧道的施工過(guò)程進(jìn)行數(shù)值模擬,分析隧道基底樁身應(yīng)力、樁身軸力及樁間土應(yīng)力沿灰土擠密樁樁深的分布特征、隧道開(kāi)挖過(guò)程中隧底圍巖位移的變化規(guī)律及隧底圍巖塑性區(qū)的分布特點(diǎn)。4、利用有限元軟件,對(duì)浸水條件兩種工況下的隧道施工過(guò)程進(jìn)行二維數(shù)值模擬,研究極端條件下軟弱黃土隧道基底樁身應(yīng)力、樁身軸力及樁間土應(yīng)力沿深度方向的分布規(guī)律、隧道支護(hù)完成后隧底圍巖豎向和水平向位移的變化規(guī)律及隧底塑性區(qū)的分布特征。
[Abstract]:The deformation of soft loess highway tunnel is always concerned by academia and engineering circles. Because of the special engineering properties of loess, the deformation characteristics of loess highway tunnel bottom are different from those of other mountain tunnels. In order to fully understand the stress and deformation characteristics of loess highway tunnel bottom in order to put forward effective foundation reinforcement measures. Based on the Fujiayao tunnel, this paper analyzes and studies the stress and deformation law of the foundation pile and the soil between piles under the condition of shallow burial by means of finite element software and field measurement. The main work is as follows: 1. According to the field test results of Fujiayao tunnel, the variation law of the pressure on the side wall, the pressure of the surrounding rock and the additional stress in the surrounding rock of the loess tunnel with large flat section and three lanes under shallow burial with time are analyzed. The stress distribution characteristics of the surrounding rock of the foundation of the tunnel are obtained. Using MIDAS/GTS finite element software, the two-dimensional numerical simulation of the tunnel construction process under the untreated condition of the tunnel bottom is carried out with the backing of the engineering as the background. The distribution law of surrounding rock pressure in tunnel basement is analyzed. The variation trend of vertical displacement and horizontal displacement during tunnel excavation and the distribution characteristics of plastic zone of surrounding rock in tunnel bottom are analyzed by numerical simulation of the tunnel construction process after the treatment of lime-soil compaction pile, and the stress of foundation pile is analyzed. The distribution characteristics of axial force of pile body and soil stress between piles along the depth of lime-soil compacted pile, the variation law of surrounding rock displacement in tunnel excavation and the distribution characteristics of plastic zone in surrounding rock of tunnel bottom. The 2-D numerical simulation of tunnel construction process under two conditions is carried out to study the distribution of pile stress, axial force of pile body and soil stress between piles in the direction of depth under extreme conditions of weak loess tunnel. The variation law of vertical and horizontal displacement of surrounding rock and the distribution characteristics of plastic zone of tunnel bottom after the completion of tunnel support.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U452.11

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 郭軍;王明年;李寧;羅祿森;;大斷面黃土隧道地基處理的沉降計(jì)算分析與討論[J];鐵道建筑;2007年04期

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本文編號(hào)：1856428