震裂軟巖隧道圍巖-支護(hù)失穩(wěn)機(jī)制和處治機(jī)理分析
本文選題:隧道工程 + 震裂軟巖 ; 參考:《公路交通科技》2014年08期
【摘要】:以穿越5·12發(fā)震斷裂帶(龍門山斷裂帶)的廣甘高速公路軟巖隧道為工程依托,依據(jù)對(duì)施工現(xiàn)場(chǎng)頻發(fā)的圍巖-支護(hù)結(jié)構(gòu)失穩(wěn)破壞的統(tǒng)計(jì),以及典型失穩(wěn)案例的分析,探討了震裂軟巖隧道圍巖-支護(hù)失穩(wěn)機(jī)制及處治機(jī)理,并選取具有代表性的圍巖-支護(hù)失穩(wěn)段為試驗(yàn)段,對(duì)其處治機(jī)理及效果進(jìn)行驗(yàn)證分析。研究結(jié)果表明:隧址區(qū)巖體受地震及新近地震的反復(fù)揉搓,致使山體內(nèi)部巖體產(chǎn)生震裂損失、圍巖穩(wěn)定性不足、地下水的滲透性增強(qiáng)、圍巖與支護(hù)結(jié)構(gòu)不能密切接觸,是造成軟巖隧道圍巖-支護(hù)失穩(wěn)事故的直接誘因;通過掌子面反壓回填、地下水引排、塌腔回填、加強(qiáng)超前支護(hù)、基底注漿加固、改善施工工法和加強(qiáng)支護(hù)參數(shù)等處治措施,可有效地穩(wěn)定掌子面前方松動(dòng)巖體、控制震裂松動(dòng)圍巖壓力、增強(qiáng)圍巖-支護(hù)體系的穩(wěn)定性,且使支護(hù)體系具備一定的安全儲(chǔ)備能力。
[Abstract]:Based on the soft rock tunnel of Guanggan Expressway which passes through the 512 seismogenic fault zone (Longmenshan fault zone), based on the statistics of the frequent failure of surrounding rock and support structure in the construction site and the analysis of typical unstable cases, This paper discusses the mechanism and treatment mechanism of surrounding rock support instability of soft rock tunnel, and selects the representative wall rock support instability section as test section, and verifies and analyzes its treatment mechanism and effect. The results show that the rock mass in the tunnel area is rubbed repeatedly by earthquakes and recent earthquakes, which results in the rock mass in the mountain body producing earthquake crack loss, the stability of surrounding rock is insufficient, the permeability of underground water is enhanced, and the surrounding rock and supporting structure can not be contacted closely. It is a direct inducement to the failure of surrounding rock and support in soft rock tunnel, through the counter pressure backfilling of the face, the drainage of groundwater, the backfilling of cavities, the strengthening of the advance support, the reinforcement of the foundation grouting, the improvement of the construction method and the strengthening of the supporting parameters, etc. It can effectively stabilize the loose rock mass in front of the face, control the pressure of the loosened rock mass, enhance the stability of the surrounding rock support system, and make the support system have certain safety reserve ability.
【作者單位】: 西南交通大學(xué)土木工程學(xué)院;四川高速公路建設(shè)開發(fā)總公司;
【基金】:國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(九七三計(jì)劃)項(xiàng)目(2010CB732105) 國(guó)家科技支撐計(jì)劃課題項(xiàng)目(2012BAG05B03) 國(guó)家自然科學(xué)基金項(xiàng)目(51378434) 四川省交通科學(xué)技術(shù)項(xiàng)目(2008.1-1-1) 西南交通大學(xué)博士研究生創(chuàng)新基金項(xiàng)目(201302)
【分類號(hào)】:U455.7;U457
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