为确保国内首次在富水砂卵石地层长距离下穿机场飞行区，以及成都地区首次采用冻结法实施联络通道的隧道工程顺利实施，通过工程类比、专家论证、优化设计、数值计算与现场监测数据分析相结合等手段，提出长距离隧道整体工程筹划优化设计、盾构配置优化、克泥效工法、陆地声呐法空洞探测、联络通道预注浆与冻结法复合截水等一系列组合技术措施。实践结果表明： 1）采用盾构工法，优化线路平、纵断面设计，增设中间风井以大幅减少盾构单次掘进距离至1
km左右，并辅以严格的沉降控制组合措施等，可以成功解决富水砂卵石地层长距离下穿机场飞行区的重大技术难题； 2）本工程提出的先在洞内使用双液浆注浆预堵水，再采用冻结法加固的复合截水方案，在富水砂卵石地层可以达到良好的截水效果。
In order to ensure the implementation of the first
longdistance shield tunnel crossing underneath airport area in waterrich sandy cobble strata in China, as well as connection gallery of
tunnel project by freezing method in Chengdu, measures, i.e. project
comparison, expert demonstration, design optimization, numerical calculation
and field monitoring data analysis, are adopted, and a series technical
measures, i.e. optimization design of overall engineering planning,
optimization of shield configuration, clay shock method, land sonar cavity
detection, pregrouting for connection gallery and
water stop by of freezing method, etc., are put forward. The practical results
show that: (1) Major technical problems of longdistance
shield tunnel crossing underneath airport area in waterrich sandy cobble strata can be successfully solved by using shield
construction method, optimizing the horizontal and vertical crosssection design, adding a middle ventilation shaft to greatly reduce
the single driving distance of shield to about 1 km, and adopting strict
settlement control measures. (2) The composite water stop scheme proposed, i.e.
water stop in tunnel by double grouting + freezing reinforcement, can achieve
good effect in waterrich sandy cobble strata.
