【摘要】：為解決高填方明洞整體式襯砌過厚導(dǎo)致的水化熱裂縫問題,在渝利鐵路重慶豐都高填方明洞工程中首次采用雙層襯砌設(shè)計(jì),通過現(xiàn)場實(shí)測及數(shù)值模擬2種方法分析該新型結(jié)構(gòu)的動(dòng)態(tài)力學(xué)特性。結(jié)果表明:在回填土達(dá)到明洞頂部前,即僅有側(cè)向荷載時(shí),明洞結(jié)構(gòu)的內(nèi)力增量很小,在回填高度超過明洞頂部后,明洞的內(nèi)力則隨回填高度的增加而線性增長;雙層襯砌明洞的外襯和內(nèi)襯的軸力之比接近二者的厚度之比,而二者的彎矩之比則無類似規(guī)律,二者的相互作用方式與組合梁類似;采用混凝土壩基礎(chǔ)時(shí)一定程度上增大明洞的荷載,其上明洞的軸力和彎矩分別為軟巖基礎(chǔ)上明洞的1.2~1.6倍和1.6~2.4倍;明洞拉應(yīng)力集中現(xiàn)象主要出現(xiàn)在邊墻位置。建議對混凝土壩基礎(chǔ)上的明洞采取減載和優(yōu)化邊墻結(jié)構(gòu)措施。
[Abstract]:In order to solve the problem of hydration thermal crack caused by the overthick lining of the high-fill Ming Cave, the double-layer lining design was adopted for the first time in Chongqing Fengdu High-fill Ming Cave Project of Yu-Li Railway. The dynamic mechanical properties of the new structure are analyzed by field measurement and numerical simulation. The results show that when the backfill reaches the top of the open hole, that is, only lateral load, the increment of the internal force of the open tunnel structure is very small, and when the backfill height exceeds the top of the open hole, the internal force of the open tunnel increases linearly with the increase of the backfill height. The axial force ratio of double lining and inner lining is close to the ratio of thickness of the two, but the ratio of bending moment of the two has no similar law, and the interaction between them is similar to that of composite beam. When the concrete dam foundation is adopted, the load of the open tunnel is increased to a certain extent, and the axial force and bending moment of the upper open tunnel are 1.20.16 times and 1.62.4times of that of the open tunnel on the soft rock foundation, respectively, and the tensile stress concentration phenomenon of the open tunnel mainly appears in the side wall position. It is suggested that measures should be taken to reduce load and optimize the side wall structure for the open hole on the foundation of concrete dam.
【作者單位】： 西南交通大學(xué)土木工程學(xué)院;西南交通大學(xué)交通隧道工程教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：中國鐵路總公司科技研究開發(fā)計(jì)劃項(xiàng)目(2014G010) 重慶市應(yīng)用開發(fā)計(jì)劃重點(diǎn)項(xiàng)目(cstc2014yykfB30003)
【分類號】：U451

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