Construction method for shield crossing of densely-punched holes in lonestone and boulder stratums

Abstract

The invention provides a construction method for shield crossing of densely-punched holes in lonestone and boulder stratums. The method comprises the following steps of S1), detecting the conditions of lonestone and boulders in a residual line stratum by using a seismic scattered wave detection method under the condition that a shield tunneling machine cutterhead fails due to the fact that a shield tunneling machine encounters the lonestone and boulders in the excavation process so as to obtain the distribution conditions of the lonestone and boulders in the residual line stratum; S2), performing geological drilling sampling on the residual line from the earth surface, and determining a dangerous area with the lonestone and boulders; S3), selecting an experimental section in the dangerousarea, punching a plurality of crushing holes from the earth surface at preset intervals, and performing impact crushing operation on the lonestone or boulders through the crushing holes; S4), excavating the experimental section by using the shield tunneling machine, and collecting excavation parameters; S5), punching a plurality of crushing holes in an unexcavated section of the residual line fromthe earth surface at preset intervals, and carrying out impact crushing operation on the lonestone or boulders through the crushing holes; and S6), excavating the unexcavated section of the residualline by using the shield tunneling machine.

Description

technical field [0001] The invention relates to the technical field of shield tunneling, in particular to a construction method for a shield tunneling through densely drilled rock formations and boulder formations. Background technique [0002] At present, according to the various geological conditions of different cities in my country, the shield tunneling method construction technology has been continuously matured and improved, and a large number of successful cases have been accumulated and used for reference. Adaptability research and construction technology management still need to face many practical problems. For example, although there are shield construction techniques and treatment methods for boulders, there is still a lack of research and relevant research on the construction difficulties caused by boulders and boulders in the pebble mixed soil layer to earth pressure shield construction. Contents of the invention [0003] The invention provides a construction...

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Problems solved by technology

[0002] At present, according to the various geological conditions of different cities in my country, the shield tunneling method construction technology has been continuously matured and improved, and a large number of successful cases have been accumulated and used for reference. Adaptability research and construction technology management still need to face many practical problems

For example, although there are shield construction techniques and treatment methods for boulders, there is still a lack of research and relevant research on the construction difficulties caused by boulders and boulders in the pebble mixed soil layer to earth pressure shield construction.

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