Surrounding rock pretreatment method for TBM passing through round tunnel section with high rock-burst risk
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United States of America Patent
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Jun 12, 2018
Issued Date -
Jan 11, 2018
app pub date -
Jun 23, 2017
filing date -
Jul 6, 2016
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Abstract
The present invention relates to a surrounding rock pretreatment method for a TBM (tunnel boring machine) passing through a round tunnel section with high rock-burst risk. A technical solution of the present invention is as follows: the surrounding rock pretreatment method includes the following steps: 1. determining a pretreatment area, wherein an area in which a clear spacing between a to-be-constructed tunnel and an adjacent existing tunnel in a TBM tunneling direction is less than 2 times that of a tunnel diameter of the TBM to-be-constructed tunnel is the pretreatment area: 2. performing controlled blasting; 3. injecting high pressure water, and selecting part of blast holes I to perform cyclic water injection pressurizing; and 4, performing normal tunneling by the TBM.
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