西康高铁首条万米隧道贯通  

出　　处：《现代隧道技术》2024年第6期161-161,共1页Modern Tunnelling Technology

摘　　要：12月11日,由西成客专陕西公司建设、铁一院设计、中铁十九局承建的西康高铁华家山隧道顺利贯通,这是西康高铁首条万米隧道贯通,标志着西康高铁全线控制工程取得阶段性进展,为下一步无砟道床施工奠定了坚实基础。西康高铁华家山隧道地处秦岭腹地,位于陕西省安康境内,隧道全长13 153 m,最大埋深532 m,洞身地层有灰岩、千枚岩、板岩、片岩,其互层以千枚岩、片岩为主,属于软质岩,Ⅳ、Ⅴ级围岩占比73.4%,均处于极高地应力状态,是西康高铁的重难点控制性工程之一。Using the Suzhou Chengbei Road utility tunnel project as the case study,numerical simulations were con-ducted to investigate the deformation patterns of metro tunnels induced by the construction of a large-section rectan-gular pipe jacking over-crossing the tunnels,focusing on tunnel uplift and surface settlement.The results indicate that pipe jacking construction reduces the load above the metro tunnels,leading to an imbalance in soil and water pressure.After applying anti-uplift counterweights inside the jacking pipe,the uplift of the right-line tunnel de-creased by 28.0%,and that of the left-line tunnel decreased by 35.5%,effectively controlling the uplift deformation of the metro tunnels.Additionally,the horizontal displacement of the right-line tunnel was reduced by 61.6%,and that of the left-line tunnel was reduced by 55.9%,significantly mitigating tunnel horizontal displacement.The coun-terweights also reduced the maximum positive bending moment at the tunnel crown and the maximum negative bending moment at the haunches by 33.1%and 32.9%,respectively.Although surface settlement increased by approximately 1 mm,the impact is considered minor.

关 键 词：隧道贯通 西成客专 无砟道床 Ⅴ级围岩 软质岩 极高地应力 控制性工程 千枚岩 

分 类 号：F532.8[经济管理—产业经济]