公路交通技术
公路交通技術
공로교통기술
TECHNOLOGY OF HIGHWAY AND TRANSPORT
2015年
4期
127-131
,共5页
隧道%瓦斯压力%安全距离%数值分析
隧道%瓦斯壓力%安全距離%數值分析
수도%와사압력%안전거리%수치분석
tunnel%gas pressure%safe distance%numeric analysis
随着科技的进步和施工技术的不断革新,在复杂地质条件下建设隧道工程便成为可能,且公路隧道或铁路隧道穿过煤层的情况也越来越多. 由于煤层中可能存在高瓦斯压力,故隧道施工可能诱发瓦斯灾害,其严重威胁隧道施工安全. 以某铁路隧道为依托,利用FLAC3D软件建立模型,研究断面尺寸对高瓦斯隧道围岩稳定性的影响.研究结果表明:随着隧道开挖断面尺寸的增加,瓦斯气体的渗流速度越大,掌子面前方围岩中塑性区就越接近煤层,发生瓦斯突出的风险也就越高.
隨著科技的進步和施工技術的不斷革新,在複雜地質條件下建設隧道工程便成為可能,且公路隧道或鐵路隧道穿過煤層的情況也越來越多. 由于煤層中可能存在高瓦斯壓力,故隧道施工可能誘髮瓦斯災害,其嚴重威脅隧道施工安全. 以某鐵路隧道為依託,利用FLAC3D軟件建立模型,研究斷麵呎吋對高瓦斯隧道圍巖穩定性的影響.研究結果錶明:隨著隧道開挖斷麵呎吋的增加,瓦斯氣體的滲流速度越大,掌子麵前方圍巖中塑性區就越接近煤層,髮生瓦斯突齣的風險也就越高.
수착과기적진보화시공기술적불단혁신,재복잡지질조건하건설수도공정편성위가능,차공로수도혹철로수도천과매층적정황야월래월다. 유우매층중가능존재고와사압력,고수도시공가능유발와사재해,기엄중위협수도시공안전. 이모철로수도위의탁,이용FLAC3D연건건립모형,연구단면척촌대고와사수도위암은정성적영향.연구결과표명:수착수도개알단면척촌적증가,와사기체적삼류속도월대,장자면전방위암중소성구취월접근매층,발생와사돌출적풍험야취월고.
With advancement of science and technology and continuous innovation of construction techniques, construction of tunnel projects under complicated geological conditions becomes possible, and more and more highway or railway tunnels cross through coal seams. Since high-gas pressure may exist in coal seams, tunnel construction may induce gas disasters, which seriously threaten the safety of tunnel construction. Dependent of some railway tunnel, this paper establishes a model by means of FLAC3D software to research influences of section size on stability of high-gas tunnel wall rocks. The results of research show that the creepage rate of gases accelerates with increase of section size of tunnel excavation, the plastic zone in wall rocks ahead of tunnel face is closer to coal seams, and the risk of outburst of gases becomes higher.
