黄河高阶地复杂地质条件大断面隧道施工监控量测与分析

Monitoring Measurement and Analysis of Large Section Tunnel Construction in the Yellow River High Terrace Complex Under Geological Conditions

兰新第二双线兰州枢纽引入工程孔家营和东坪村等隧道穿越黄河Ⅲ级阶地,地质条件较为复杂,涉及黄土隧道、圆砾土隧道、泥岩夹砂岩隧道、二元(三元)地层组合隧道。结合阶地地质条件的特点,选择孔家营隧道不同软岩地层断面对施工进行全面、系统监控量测,以对比分析不同地质条件围岩在开挖过程中的结构和应力状态的变化和支护结构的稳定状态。评价和修改隧道的初期支护参数,进行力学分析以及为二次衬砌施作时间提供信息依据,同时深化工法的适用性,并对其进行优化,提出适用于该类地质条件隧道施工的工法参数。

Kongjiaying and Dongping village tunnel of the second Lanzhou-Xinjing railway by the introduction project of Lanzhou hub passing through the Yellow River third terrace,where geological conditions are more complex,it involves the loess,round gravel soil with sandstone,mudstone,two（three elements） combination strata.According to the characteristics of terrace geological conditions,different soft rock strata section of Kongjiaying tunnel is chosen for comprehensive monitoring and measurement in order to compare the structural and stress changes and the stabilities of support structure in different geological conditions.Evaluation and modification of the tunnel primary support parameters,mechanical analysis so as to provide information for mechanical analysis and construction time of the secondary lining as well as optimize the construction method and propose the method of parameter suitable for the geological conditions of tunnel construction.