軟弱圍巖隧道鋼纖維混凝土襯砌承載特性模型試驗(yàn)研究
[Abstract]:In order to meet the requirements of sealing rock surface as soon as possible after excavation of soft surrounding rock tunnel, adapting to certain deformation and providing sufficient support force, the mechanical behavior of plain concrete, reinforced concrete and steel fiber reinforced concrete lining was tested in laboratory. The bearing capacity of steel fiber reinforced concrete (SFRC) lining is studied. The results show that the initial crack load of steel fiber reinforced concrete (SFRC) lining is increased by 20%, and the ultimate load is greatly improved. With the addition of steel fiber, the toughness of the lining structure is enhanced, and after the initial crack, the lining can resist certain deformation and greatly reduce the deformation rate. Compared with plain concrete and reinforced concrete, the reinforced concrete can bear more deformation. After the initial crack, the load-bearing characteristic curve of the steel fiber reinforced concrete lining increases slowly, and there is still no evidence of convergence when the initial crack load is 2 times. The plain concrete converges rapidly, and the reinforced concrete tends to converge rapidly after a certain slow rise, under the condition of weak surrounding rock. The initial support of steel fiber reinforced concrete (SFRC) can meet the characteristic curve of surrounding rock after a certain deformation, which can reach the stable state of surrounding rock structure. It is a fast supporting material with good mechanical properties. The research results are of great significance to the design and construction of soft surrounding rock tunnel.
【作者單位】: 北方工業(yè)大學(xué)土木工程學(xué)院;石家莊鐵道大學(xué)土木工程學(xué)院;河北交通職業(yè)技術(shù)學(xué)院土木工程系;中鐵七局集團(tuán)鄭州工程有限公司;四川省交通廳公路規(guī)劃勘察設(shè)計(jì)研究院;
【基金】:國家自然科學(xué)基金項(xiàng)目(51408008,51478277) 國家十二五科技支撐項(xiàng)目(2012BAK09B06) 河北省自然科學(xué)基金項(xiàng)目(E201619002) 四川省應(yīng)用基礎(chǔ)研究計(jì)劃項(xiàng)目(2014JY0090,2015JY0166) 北京市教委青年拔尖人才培育計(jì)劃項(xiàng)目 北方工業(yè)大學(xué)科研創(chuàng)新團(tuán)隊(duì)(XN018007)
【分類號】:U451.5
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