US 12,359,567 B2
Blast hole arrangement structure used for blasting for rheological soft-weak surrounding rock tunnel and construction method for rheological soft-weak surrounding rock tunnel
Xin Zhang, Tianjin (CN); Jinshan Sun, Tianjin (CN); Xiangping Zhang, Tianjin (CN); and Daqi Hu, Tianjin (CN)
Assigned to CHINA RAILWAY 18 BUREAU GROUP CO. LTD., Tianjian (CN)
Filed by CHINA RAILWAY 18 BUREAU GROUP CO. LTD., Tianjin (CN)
Filed on Oct. 11, 2022, as Appl. No. 17/964,005.
Claims priority of application No. 202211159671.3 (CN), filed on Sep. 22, 2022.
Prior Publication US 2024/0102385 A1, Mar. 28, 2024
Int. Cl. F42D 3/04 (2006.01); E21D 9/00 (2006.01)
CPC E21D 9/006 (2013.01) [F42D 3/04 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A blast hole arrangement structure used for blasting for a rheological soft-weak surrounding rock tunnel, wherein a tunnel section subjected to grouting reinforcement is divided into two parts, that is, an upper half section (1) and a lower half section (2), cutting vibration reduction holes (1-2) used in coordination with cutting holes (1-1) are formed in the upper half section (1), and the cutting vibration reduction holes (1-2) are filled with water bags,
wherein a plurality of first-layer vibration isolation holes (1-7) are formed in a tunnel excavation contour line of the upper half section (1), and the first-layer vibration isolation holes (1-7) are filled with soft mud.