Research on TBM Tunneling Construction Technology for Fault Fractured Zones and Shallow Buried Fractured Strata
The fault fracture zone will seriously affect the safety and tunneling efficiency of the subway tunnel excavation process.It may induce a series of safety accidents,such as water gushing and collapse,if it is not handled properly.Taking Qingdao Metro Line 1 as the research background,the characteristics of subway tunnel crossing fault fracture zones and shallow buried fracture zones were analyzed.The method of surface deep hole pre-grouting to reinforce the fault fracture zone is adopted,and the grouting borehole design is carried out in accordance with the problem of shield tunneling through the deep fault fracture zone.Meanwhile,the grouting material,grouting process and related grouting parameters were optimized.For the shallow fracture zone stratum,the method of optimizing tunnel boring machine(TBM)tunneling parameters and direct tunneling construction was adopted.Thus,the safe tunneling construction of TBM under unfavorable strata has been successfully realized.
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