In the stratum with uneven hardness and karst cave area,the excavation of Earth Pressure Balance Shield(EPBS)machine will easily lead to serious cutter head wear and surface subsidence,among other adverse consequences.In view of the disadvantages of long construction period and high cost of the opening method with shield protection slurry,a fast-setting low-strength slurry filling shield opening and cutter changing technology suitable for the upper soft and lower hard,as well as the karst stratum is researched and developed.This technology clarifies the construction principle of the inert slurry filling method by optimizing the inert slurry filling silo to enhance air tightness,improving the slurry mixing process,implementing the slag gas replacement in the silo,and strengthening the air tightness testing of the silo in four technical aspects.The construction process of shield opening and cutter changing under pressure using the inert slurry filling method in high karst development areas is summarized,and research is carried out as regards the key technologies.Field practice shows that the inert slurry filling method achieves high-quality and efficient soil silo pressure maintenance,reduces construction safety risks,has significant economic and social benefits,and successfully assisted shield machines in crossing high karst development areas.
关键词
地铁施工/盾构/衡盾泥法开仓法/惰性浆液/上软下硬地层/填仓法/开仓换刀
Key words
metro construction/shield/opening method with shield protection slurry/inert slurry/upper soft and lower hard strata/filling method/shield opening and cutter changing
维普
万方数据