【摘要】：針對(duì)砂卵石地層特性配制了圍巖相似材料,利用自主研發(fā)的大型平面模型試驗(yàn)臺(tái)架,對(duì)不同荷載條件下非對(duì)稱連拱隧道的受力特性進(jìn)行了深入研究,重點(diǎn)分析了襯砌外表面壓力和結(jié)構(gòu)內(nèi)力的分布及變化特點(diǎn),總結(jié)了隧道裂縫的發(fā)展規(guī)律和結(jié)構(gòu)破壞過(guò)程。試驗(yàn)結(jié)果表明:非對(duì)稱連拱隧道大洞襯砌外表面壓力顯著大于小洞,但兩者分布規(guī)律相似,最大值均位于拱頂,其次為內(nèi)側(cè)拱肩,外側(cè)拱腰處最小;左右洞室受力不對(duì)稱導(dǎo)致隧道中墻存在明顯偏壓;注漿加固圈可以有效降低襯砌外表面壓力,改善結(jié)構(gòu)受力條件,提高結(jié)構(gòu)穩(wěn)定性。結(jié)構(gòu)內(nèi)力在加載過(guò)程中呈現(xiàn)出復(fù)雜變化,在裂縫產(chǎn)生之前,基本保持線性增長(zhǎng);首條裂縫出現(xiàn)后,結(jié)構(gòu)內(nèi)力重新分布,但總體上仍具有一定的承載能力;當(dāng)裂縫充分發(fā)展,特別是當(dāng)拱部出現(xiàn)裂縫后結(jié)構(gòu)承載能力大幅下降。襯砌結(jié)構(gòu)首先于內(nèi)側(cè)拱腳處出現(xiàn)縱向裂縫,隨著荷載的增加,裂縫數(shù)量和寬度也逐漸增加且主要分布在靠近中墻一側(cè)。
[Abstract]:According to the characteristics of sand and gravel strata, the similar materials of surrounding rock are prepared, and the mechanical characteristics of asymmetric multi-arch tunnel under different load conditions are deeply studied by using the self-developed large-scale plane model test-bed. The distribution and variation characteristics of the outer surface pressure and the internal force of the lining are analyzed emphatically, and the development law of the tunnel crack and the structural failure process are summarized. The test results show that the external surface pressure of the large tunnel lining of asymmetric multi-arch tunnel is significantly higher than that of the small tunnel, but the distribution of both is similar, the maximum value is located at the arch top, the second is the inner arch shoulder, and the minimum is at the outer arch waist. The asymmetric force of the left and right caverns leads to the obvious bias of the middle wall of the tunnel, and the grouting ring can effectively reduce the external surface pressure of the lining, improve the stress condition of the structure and enhance the stability of the structure. The internal forces of the structure show complex changes during the loading process, and keep linear growth before the cracks occur, and the internal forces of the structure are redistributed after the first crack appears, but it still has a certain bearing capacity on the whole. When the cracks are fully developed, especially when cracks appear in the arch, the bearing capacity of the structure decreases significantly. The longitudinal cracks appear in the inner arch at first. With the increase of the load the number and width of the cracks increase gradually and are mainly distributed near the side of the middle wall.
【作者單位】： 北京交通大學(xué)城市地下工程教育部重點(diǎn)實(shí)驗(yàn)室;北京交通大學(xué)土木建筑工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金面上項(xiàng)目(51378002) 國(guó)家科技支撐計(jì)劃項(xiàng)目課題(2012BAJ01B03)
【分類號(hào)】：U451

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2 何s，

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