Research on the construction technology of shield opening and cutter changing under pressure by fast setting low strength slurry filling method
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.
metro constructionshieldopening method with shield protection slurryinert slurryupper soft and lower hard stratafilling methodshield opening and cutter changing
万方数据
维普
