旋挖钻处理锚索侵限的施工工序研究——以济南市轨道交通4号线段店站锚索侵限处理为例

Study on Construction Procedure of Rotary-dig Drilling Treatment of Anchor Cable Intrusion Limit:Taking the treatment of anchor cable intrusion at Duandian Station of Jinan Rail Transit Line 4 as an example

在地铁施工建设过程中经常会遇到如废旧基础、锚索、锚杆等地下障碍物,给地下施工安全及进度带来了较大的影响,因此研究如何安全高效处理地下障碍物有着重要的理论意义和实用价值。以济南市轨道交通4号线段店站锚索侵限处理为工程依托,在确定使用旋挖钻处理地下侵限锚索的前提下,借助FLAC3D数值模拟平台探索3种不同旋挖工序对地层和既有结构的影响,通过对比选出最适合的旋挖工序。计算结果表明,隔一挖一跳点旋挖施工对于地层和既有结构的影响明显小于无间隔连续旋挖施工和隔二挖一跳点旋挖施工,隔一挖一跳点旋挖施工更能安全高效地处理地下侵限锚索。

Underground obstacles such as waste foundation,anchor cable and anchor rod are often encountered in the process of subway construction,which has a great impact on the safety and progress of underground construction.Therefore,it is of great theoretical significance and practical value to study how to safely and efficiently deal with these underground obstacles.Based on the anchor cable intrusion treatment of Duan dian station of Jinan rail transit line 4,under the premise of using rotary drill to treat the underground intrusion anchor cable,the impact of three different rotary excavation processes is explored on the stratum and existing structure with the help of FLAC^(3D) numerical simulation platform,so as to select the most suitable rotary excavation process through comparison.The analysis of the calculation results shows that the influence of the rotary excavation construction of“alternate excavation and one jump point”on the stratum and the existing structure is significantly smaller than that of the continuous rotary excavation construction without interval and the rotary excavation construction of“alternate excavation and one jump point”.It can be seen that the rotary excavation construction at every other excavation and jumping point can more safely and efficiently handle the underground invasion limit anchor cable.