發(fā)布時(shí)間：2018-04-03 16:29

  本文選題：膨脹土隧道　切入點(diǎn)：脹縮演變規(guī)律　出處：《鐵道科學(xué)與工程學(xué)報(bào)》2017年01期

【摘要】：為研究干濕交替條件下膨脹圍巖的脹縮演變規(guī)律,利用南寧地區(qū)的膨脹土制作了膨脹土隧道物理模型。通過(guò)對(duì)隧道模型進(jìn)行五個(gè)循環(huán)的干濕交替試驗(yàn),得出了圍巖在吸水及失水條件下的應(yīng)力—時(shí)間關(guān)系曲線,并對(duì)圍巖在吸水及失水過(guò)程中的力學(xué)響應(yīng)及行為表現(xiàn)進(jìn)行了分析與描述。結(jié)果表明:隨循環(huán)次數(shù)的增加,各應(yīng)力—時(shí)間關(guān)系曲線趨于平緩,各階段圍巖應(yīng)力變化值呈減小及各階段循環(huán)所耗時(shí)間呈逐漸短化的趨勢(shì)。說(shuō)明干濕交替作用,使圍巖的脹縮能力減弱,滲透性提高。此外,在圍巖濕脹引起的洞周總圍巖應(yīng)力增加值中,底板處最大約為40kpa,因此在隧道設(shè)計(jì)和施工時(shí)應(yīng)注意底板的變形。
[Abstract]:In order to study the expansion and shrinkage evolution of expansive surrounding rock under the condition of alternate dry-wet conditions, a physical model of expansive soil tunnel was made by using expansive soil in Nanning area.The stress-time curves of surrounding rock under the condition of water absorption and water loss are obtained through the dry and wet alternating test of five cycles on the tunnel model.The mechanical response and behavior of surrounding rock in the process of water absorption and water loss are analyzed and described.The results show that with the increase of cycle times, the stress-time relation curves tend to be gentle, the stress changes of surrounding rocks decrease and the cycle time of each stage becomes shorter gradually.It shows that the capacity of expansion and shrinkage of surrounding rock is weakened and the permeability is improved by the alternating action of dry and wet.In addition, the maximum value of stress increase in surrounding rock surrounding rock caused by surrounding rock swelling is about 40 kpa.Therefore, attention should be paid to the deformation of bottom slab in tunnel design and construction.
【作者單位】： 桂林理工大學(xué)廣西巖土力學(xué)與工程重點(diǎn)實(shí)驗(yàn)室;賀州市住房和城鄉(xiāng)建設(shè)局;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51368014)
【分類號(hào)】：U451.5

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