摘要
为探讨超长公路隧道利用辅助坑道施工总体方案设计的合理性,准确控制工程的工期和造价,文章以米仓山隧道总体施工方案的设计与实践为背景,探讨了利用辅助坑道辅助施工的原则,测算了竖井辅助施工效能和延米造价,估算了斜井逆坡施工的设计涌水量,得出如下结论:(1)独头掘进距离超过5000 m或长度大于10000 m的隧道有必要利用辅助坑道进行辅助施工,设置有运营通风井时应优先利用通风井作为施工辅助坑道;(2)竖井(有轨斜井)辅助施工造价高,提升能力有限,辅助施工坑道应优先选用无轨斜井、平导或横洞,坡度宜控制在12.3%以内;(3)根据勘察涌水量预测和基于均质含水层的假定给出了施工期设计涌水量计算方法及合理的排水设施配置。
In order to discuss the design rationality of the overall construction scheme for the super-long highway tunnel with auxiliary adit,and accurately control the construction period and cost,the principles of construction with the help of auxiliary adit are discussed,the auxiliary construction efficiency and construction cost per linear meter by using shaft are calculated,the designed water inflow volume for shaft in case of adverse grade construction is esti⁃mated,and it comes the following conclusions:(1)it is necessary to use auxiliary adit to assist the construction of tunnels with distance of blind heading more than 5,000 meters or tunnel length larger than 10,000 meters,and the ventilation shaft should be given a priority as an auxiliary adit if it is set for operation ventilation;(2)the auxiliary construction by vertical shaft(inclined shaft with rail)is expensive and its lifting capacity is limited,the trackless in⁃clined shaft,parallel adit or cross passage should be chosen preferably regarding the auxiliary construction of tunnels and the slope should be controlled within 12.3%;(3)on the basis of predicted water inflow volume and the assump⁃tion of homogeneous aquifer,the calculation method of designed water inflow volume during construction and the ra⁃tional allocation of drainage facilities are given.
作者
唐协
林国进
何佳
王俊
TANG Xie;LIN Guojin;HE Jia;WANG Jun(Sichuan Highway Planning,Survey,Design and Research Institute Co.,Ltd,Chengdu 610041;Tunnel Sub-committee,Sichuan Highway&Transportation Society,Chengdu 610041)
出处
《现代隧道技术》
EI
CSCD
北大核心
2020年第4期12-19,共8页
Modern Tunnelling Technology
基金
四川省交通科技项目(2010A1-2和2014C-4)。
关键词
超长隧道
钻爆法
总体施工方案
辅助坑道
辅助施工
设计涌水量
方案比选
Super-long tunnel
Drilling and blasting method
Overall construction scheme
Auxiliary adit
Auxilia⁃ry construction
Designed water inflow volume
Scheme comparison and selection
