本文選題：隧道工程 + 掘進(jìn)效應(yīng)�。� 參考：《施工技術(shù)》2014年18期

【摘要】：通過數(shù)值模擬法對隧道施工全過程進(jìn)行了三維彈塑性分析,尤其對不同施工條件下的隧道豎直位移變化進(jìn)行了分析。結(jié)果表明:在掘進(jìn)面到達(dá)前,圍巖會(huì)產(chǎn)生前期位移收斂,本算例前期位移量為總位移量的32.7%;隧道變形受圍巖級(jí)別、埋深及半徑的影響,圍巖劣化條件下的位移增量主要發(fā)生在隧道斷面開挖前,半徑增大條件下的位移增量主要發(fā)生在隧道斷面開挖后;Ⅴ級(jí)圍巖條件下,前期位移量顯著增大;隧道變形穩(wěn)定所需距離主要受半徑的影響,穩(wěn)定距離S與半徑R關(guān)系式為S≈1.2R。
[Abstract]:The 3-D elastic-plastic analysis of the whole process of tunnel construction is carried out by numerical simulation, especially the variation of vertical displacement of tunnel under different construction conditions is analyzed. The results show that the surrounding rock will converge in the early stage before the heading surface reaches, and the early displacement is 32.7 of the total displacement in this example, and the tunnel deformation is affected by the surrounding rock level, the depth of burial and the radius, and the deformation of the tunnel is affected by the level of the surrounding rock, the depth of the tunnel and the radius. The displacement increment under the condition of surrounding rock deterioration mainly occurs before the excavation of the tunnel section, the displacement increment under the condition of increasing radius mainly occurs after the excavation of the tunnel section, and under the condition of grade V surrounding rock, the early displacement increases significantly. The distance required for the deformation stabilization of the tunnel is mainly affected by the radius. The relation between the stable distance S and the radius R is S 鈮，

本文編號(hào)：2021963