In the possible caving section, which could not be drilled because of the existing buildings and facilities, detecting and preconditioning should be made to avoid the falling of shield machine and formation collapsing.
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晏胜荣,贺飞.地表不具备钻探条件下的盾构机通过空洞地段施工技术[J].钻探工程,2008,35(9):76-79.YAN Sheng-rong, HE Fei. Construction Technology of Shield Machine Passing the Undrillable Section with Possible Caving[J]. Drilling Engineering, 2008,35(9):76-79.