本文選題：傾斜軟硬互層 + 隧道��； 參考：《現(xiàn)代隧道技術(shù)》2017年04期

【摘要】：文章結(jié)合重慶南涪高速公路鴨江隧道工程,進(jìn)行了傾斜軟硬互層隧道破壞過(guò)程的模型試驗(yàn)。試驗(yàn)結(jié)果表明,隧道的破壞從左側(cè)邊墻周?chē)能浫鯉r層開(kāi)始。根據(jù)破壞特征可以將隧道破壞過(guò)程分為五個(gè)階段,且隧道圍巖的破壞會(huì)導(dǎo)致圍巖應(yīng)力的卸荷效應(yīng)。采用有限元軟件建立數(shù)值模型分析隧道破壞過(guò)程,數(shù)值計(jì)算結(jié)果表明:圍巖的最大主應(yīng)力極值始終位于隧道左側(cè)拱腰處,與隧道最先破壞的位置不一致。從拱頂路徑的應(yīng)力分布分析,圍巖的第三主應(yīng)力為最大主應(yīng)力。由于軟硬巖層的巖性不同,圍巖應(yīng)力沿應(yīng)力路徑表現(xiàn)出震蕩式變化。在隧道破壞的第一階段,壓力拱范圍約為隧道開(kāi)挖跨度的1.35倍。研究結(jié)果對(duì)類(lèi)似隧道工程具有重要的參考價(jià)值。
[Abstract]:Combined with the Yagang Tunnel of Nanfu Expressway in Chongqing, the model test of the failure process of inclined soft and hard interlayer tunnel is carried out in this paper. The test results show that the tunnel failure begins with the soft rock layer around the left side wall. According to the failure characteristics, the tunnel failure process can be divided into five stages, and the tunnel surrounding rock failure will lead to the unloading effect of surrounding rock stress. The finite element software is used to establish a numerical model to analyze the tunnel failure process. The numerical results show that the maximum principal stress extremum of surrounding rock is always located at the left arch of the tunnel, which is inconsistent with the first failure position of the tunnel. According to the stress distribution of the arch path, the third principal stress of surrounding rock is the maximum principal stress. Because of the different lithology of soft and hard strata, the stress of surrounding rock shows oscillatory variation along the stress path. In the first stage of tunnel failure, the range of pressure arch is about 1.35 times of tunnel excavation span. The results have important reference value for similar tunnel engineering.
【作者單位】： 重慶大學(xué)土木工程學(xué)院;山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室;重慶交通大學(xué)土木建筑學(xué)院;山西省交通科學(xué)研究院;
【基金】：黃土地區(qū)公路建設(shè)與養(yǎng)護(hù)技術(shù)交通行業(yè)重點(diǎn)實(shí)驗(yàn)室開(kāi)放課題(KLTLR-Y13-2)
【分類(lèi)號(hào)】：U451.2

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