【摘要】：基于八仙峁隧道、麻塌隧道2組典型斷面二襯混凝土應(yīng)變監(jiān)測(cè)數(shù)據(jù),分析了二襯混凝土在黃土隧道中應(yīng)變隨時(shí)間的變化規(guī)律;通過(guò)換算得到二襯結(jié)構(gòu)所受應(yīng)力,將換算結(jié)果代入安全度應(yīng)力表達(dá)式,得出該斷面下黃土隧道二襯安全度分布,并與有限元數(shù)值模擬結(jié)果進(jìn)行對(duì)比。結(jié)果表明:在黃土隧道的支護(hù)結(jié)構(gòu)中,二襯混凝土結(jié)構(gòu)不僅作為安全儲(chǔ)備,而且往往需要承受大部分荷載,通過(guò)數(shù)值模擬確定二襯承受的荷載約為圍巖荷載的40%;二襯混凝土結(jié)構(gòu)作為受壓構(gòu)件,其最大應(yīng)變出現(xiàn)在邊墻底部位置;數(shù)值模擬與計(jì)算所得二襯安全度分布規(guī)律基本一致,拱頂、拱肩、邊墻底部仰拱部位安全度相對(duì)較小但滿足規(guī)范要求,仰拱底部所受壓應(yīng)力最大且安全度未滿足規(guī)范要求。
[Abstract]:Based on the strain monitoring data of two typical sections of Baxanmao tunnel and Maituo tunnel, the variation of strain of concrete with time in loess tunnel is analyzed. The stress of the two-liner structure is obtained by conversion, and the result of conversion is replaced by the expression of the safety degree, and the distribution of the second-lining safety degree of the loess tunnel under the section is obtained, and the results are compared with the results of finite element numerical simulation. The results show that in the supporting structure of loess tunnel, the concrete lining structure not only serves as a safe reserve, but also needs to bear most of the load. The numerical simulation shows that the load bearing the second lining is about 40 percent of the surrounding rock load. As a compression member, the maximum strain of two-lining concrete structure appears at the bottom of the sidewall. The result of numerical simulation is consistent with that of calculation. The safety degree of arch roof, arch shoulder and the bottom of side wall is relatively small but meets the requirements of code, and the pressure stress at the bottom of inverted arch is the largest and the safety degree does not meet the requirements of the specification.
【作者單位】： 長(zhǎng)安大學(xué)陜西省公路橋梁與隧道重點(diǎn)實(shí)驗(yàn)室;西安建筑科技大學(xué)理學(xué)院;
【基金】：陜西省自然科學(xué)基礎(chǔ)研究計(jì)劃項(xiàng)目(2014JM7245) 陜西省工業(yè)科技攻關(guān)計(jì)劃項(xiàng)目(2015GY185) 交通運(yùn)輸部西部交通建設(shè)科技項(xiàng)目(2007 318 000 18)
【分類號(hào)】：U451

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