交通科技
交通科技
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TRANSPORTATION SCIENCE & TECHNOLOGY
2015年
1期
107-110
,共4页
大管棚%膨胀性黄土%偏压隧道%数值模拟
大管棚%膨脹性黃土%偏壓隧道%數值模擬
대관붕%팽창성황토%편압수도%수치모의
large pipe roof support%swelling loess%unsymmetrically loaded tunnel%numerical simula-tion
针对小河沟膨胀性黄土铁路隧道浅埋偏压段大管棚施工工艺，分析了大管棚的受力状态和对围岩的加固效果。利用快速拉格朗日限差分软件 FLAC3D 模拟隧道管棚施工，得到各工况下管棚与管棚注浆壳体的受力变形情况和掌子面前方围岩变形位移，将所得结果与无管棚支护时的围岩变形位移比较，分析研究管棚预支护效果。试验分析表明，管棚有效抑制了掌子面前方软弱围岩的塑性流动，增强了围岩稳定性。
針對小河溝膨脹性黃土鐵路隧道淺埋偏壓段大管棚施工工藝，分析瞭大管棚的受力狀態和對圍巖的加固效果。利用快速拉格朗日限差分軟件 FLAC3D 模擬隧道管棚施工，得到各工況下管棚與管棚註漿殼體的受力變形情況和掌子麵前方圍巖變形位移，將所得結果與無管棚支護時的圍巖變形位移比較，分析研究管棚預支護效果。試驗分析錶明，管棚有效抑製瞭掌子麵前方軟弱圍巖的塑性流動，增彊瞭圍巖穩定性。
침대소하구팽창성황토철로수도천매편압단대관붕시공공예，분석료대관붕적수력상태화대위암적가고효과。이용쾌속랍격랑일한차분연건 FLAC3D 모의수도관붕시공，득도각공황하관붕여관붕주장각체적수력변형정황화장자면전방위암변형위이，장소득결과여무관붕지호시적위암변형위이비교，분석연구관붕예지호효과。시험분석표명，관붕유효억제료장자면전방연약위암적소성류동，증강료위암은정성。
Xiaohegou tunnel is an under construction shallow swelling loess tunnel with Large Pipe Roof Support.Large Pipe Roof Support construction and excavation of the tunnel were simulated by the Fast Lagrangian finite difference software FLAC3D.The pipe roof loading states and the deforma-tion of surrounding rock in front of the tunnel face were obtained in each step of excavation,and the results were compared with a simulation without Large Pipe Roof Support.The results show that the reinforcement effect of Pipe Roof was to restrain the plastic flow of soft soil.
