冻结法在江底取水隧道修复工程中的应用

摘要

During a construction of a river bottom shield water taking tunnel for Changshu Power Ge-neration Plant ,a backfill ground freezing method was applied to form a temporary freezing sealing wall after a water inrush and sand burst accident occurred. Then the standing water in the tunnel was drained and a permanent sealing wall was build to provide a protection to the following safety and suc-cessful construction of the tunnel project. The practices showed that in comparison with the application of a concrete pouring in water method in the tunnel to build a temporary sealing wall ,under the com-plicated geological condition ,the application of the backfill ground freezing method to build the tem-porary sealing wall could effectively prevent a water inrush and sand burst accident occurred ,would have a less damage to the tunnel structure ,a less influence to the neighboring buildings and would have no person required to work in the tunnel with standing water. Thus the backfill ground freezing method could have a high control and high safety with a promotion and application value.%__摘_常熟发电厂江底盾构取水隧道施工中，发生突水涌砂事故后，采用填充冻结法来形成临时冻结封堵墙；然后排出隧道内积水，构筑永久封堵墙，为隧道工程下一步施工的安全、顺利进行提供了保障。实践表明，采用填充冻结法施工临时封堵墙，与隧道内灌注水下混凝土方法施工临时封堵墙相比，在复杂地质条件下，能有效防止突水涌砂事故发生，对隧道本体损伤较小，对相邻建筑物影响较小，且人员无需进入积水隧道内施工，可控性、安全性较高，具有推广应用价值。