發(fā)布時(shí)間：2018-06-23 08:04

  本文選題：山嶺隧道 + 襯砌裂損　； 參考：《鄭州大學(xué)學(xué)報(bào)(工學(xué)版)》2017年04期

【摘要】：圍巖風(fēng)化不僅能改變圍巖的礦物成分,而且能降低其強(qiáng)度,使得作用于襯砌結(jié)構(gòu)上的圍巖壓力加大,導(dǎo)致襯砌開裂,甚至發(fā)生破壞.新家洞隧道穿越地層為花崗巖地層,開挖后圍巖穩(wěn)定性好,按Ⅱ級圍巖支護(hù).但隧道建成2 a后,隧道襯砌結(jié)構(gòu)出現(xiàn)嚴(yán)重裂損.為了研究襯砌結(jié)構(gòu)開裂原因,采用試驗(yàn)手段對裂縫周邊混凝土強(qiáng)度及花崗巖的物相成分、力學(xué)性質(zhì)等進(jìn)行測試.測試結(jié)果表明,圍巖風(fēng)化、強(qiáng)度降低是導(dǎo)致襯砌開裂的主要原因.最后,利用有限元反分析法確定圍巖物理力學(xué)參數(shù),并基于此對整治后隧道結(jié)構(gòu)安全性進(jìn)行評價(jià),從數(shù)值模擬結(jié)果和現(xiàn)場實(shí)施效果看,襯砌結(jié)構(gòu)滿足強(qiáng)度要求.研究成果對類似地層中隧道設(shè)計(jì)與施工具有參考意義.
[Abstract]:The weathering of the surrounding rock can not only change the mineral composition of the surrounding rock, but also reduce its strength, which makes the surrounding rock pressure acting on the lining structure increase, leading to the cracking and even destruction of the lining. Xinjiadong tunnel is a granite stratum, which has good stability after excavation and is supported by class 鈪，

本文編號：2056433