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  本文關(guān)鍵詞：漫談礦山法隧道技術(shù)第七講——纖維混凝土襯砌　出處：《隧道建設(shè)》2016年05期 　論文類型：期刊論文

  更多相關(guān)文章： 隧道 礦山法 襯砌 鋼纖維混凝土 聚丙烯纖維混凝土 標準配比 低發(fā)熱配比 高流動性配比 纖維混入率

【摘要】：目前國際上纖維混凝土襯砌有代替鋼筋混凝土襯砌的趨勢,而我國在這方面的研究力度不夠,亟待加強。1)介紹日本采用鋼纖維混凝土、聚丙烯纖維混凝土和素混凝土進行的纖維混凝土承載特性試驗的試驗組合、加載方法及試驗結(jié)果。2)介紹日本的非鋼纖維混凝土襯砌配比試驗,試驗采用PP、PVA和PET 3種非鋼纖維,采用不同混入率及不同的配比組合進行;試驗結(jié)果是抗壓強度因基本配比的不同而有差異,其順序為"低發(fā)熱配比""標準配比""高流動性配比";彎曲韌性與纖維種類無關(guān),為提高彎曲韌性,增加纖維混入率是最有效的。3)從纖維混凝土材料的品質(zhì)管理基準、配比、纖維混入的決定方法、纖維混凝土基準試驗的項目及頻率、標準配比的決定方法、日常管理試驗的項目及頻率、施工、非鋼纖維品質(zhì)規(guī)格、隧道襯砌用非鋼纖維均一性確認試驗、襯砌纖維混凝土模擬澆筑試驗等方面闡述纖維混凝土襯砌的施工管理要領(lǐng)。4)最后指出,在易于發(fā)生較大變形的圍巖,如膨脹性圍巖、擠壓性圍巖以及土砂圍巖等軟弱圍巖,需要二次襯砌發(fā)揮力學功能的場合,采用纖維混凝土襯砌是合適的選擇。纖維混凝土襯砌需要研究解決的問題很多,如纖維類型的選定、纖維混入率的決定以及確保纖維混凝土襯砌品質(zhì)的施工工藝等。若有可能,選定一二座隧道進行試驗施工,以推進纖維混凝土襯砌的應(yīng)用。
[Abstract]:At present, fiber reinforced concrete lining has a tendency to replace reinforced concrete lining in the world, but in our country, the research in this area is not enough, so it is urgent to strengthen the steel fiber reinforced concrete in Japan. The test combination, loading method and test results of fiber reinforced concrete (FRC) bearing characteristics of polypropylene fiber concrete and plain concrete are introduced in this paper. (2) the non-steel fiber concrete lining ratio test in Japan is introduced. Three kinds of non-steel fibers, PPP-PVA and PET, were used in the experiment. The results show that the compressive strength varies with the basic ratio, and the order is "low heat ratio", "standard ratio" and "high fluidity ratio". Flexural toughness has nothing to do with fiber types. In order to improve flexural toughness, increasing fiber blending rate is the most effective. 3) from fiber concrete material quality management standard, ratio, fiber blending decision method. Project and frequency of fiber-reinforced concrete benchmark test, determination method of standard ratio, item and frequency of routine management test, construction, non-steel fiber quality specification, non-steel fiber homogeneity confirmation test for tunnel lining. The construction management of fiber reinforced concrete lining is discussed in this paper. Finally, it is pointed out that the surrounding rock which is prone to large deformation, such as expansive surrounding rock, is easy to be deformed. The soft surrounding rock, such as extruded surrounding rock and soil-sand surrounding rock, need secondary lining to play a mechanical function, fiber concrete lining is the appropriate choice. Fiber concrete lining needs to be studied and solved a lot of problems. For example, the selection of fiber type, the determination of fiber blending ratio and the construction technology to ensure the quality of fiber concrete lining. If possible, select one or two tunnels to carry out experimental construction to promote the application of fiber concrete lining.
【作者單位】： 西南交通大學;
【分類號】：U455.4
【正文快照】： 0引言山嶺隧道混凝土襯砌的開裂,除起因于混凝土硬化時的溫度應(yīng)力和干燥收縮外,還可能起因于膨脹性圍巖和圍巖劣化產(chǎn)生的松弛地壓。因為隧道是拱形機構(gòu),對于襯砌混凝土的輕微開裂,一般不會產(chǎn)生有害的變異,但可能由于輕微開裂導致的襯砌承載力降低從而造成影響襯砌穩(wěn)定性及耐久

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本文編號：1409706