Jul 15, 2025

US12359567 - Blast hole arrangement structure used for blasting for rheological soft-weak surrounding rock tunnel and construction method for rheological soft-weak surrounding rock tunnel

A tunnel section subjected to grouting reinforcement is divided into two parts, that is, an upper half section and a lower half section, cutting vibration reduction holes used in coordination with cutting holes are formed in the upper half section, and the cutting vibration reduction holes are not charged and are filled with water bags only. According to the blast hole arrangement structure used for blasting for the rheological soft-weak surrounding rock tunnel of the invention, a cutting blasting effect is improved, excess energy is emptied and absorbed, propagation of shock waves and stress waves around is reduced, and vibration is reduced; and according to the invention, the purpose of forming vibration isolation holes in a tunnel excavation contour line of the upper half section is to prevent, absorb, reflect and refract the propagation of the blasting shock waves, stress waves and seismic waves.

Assignee: CHINA RAILWAY 18 BUREAU GROUP CO. LTD.
Inventors: Xin Zhang, Jinshan Sun, Xiangping Zhang, Daqi Hu
Filing date: 2022-10-11

The patent describes a blast hole arrangement structure designed for tunneling in rheological soft-weak surrounding rock, which includes upper and lower sections with specialized vibration reduction holes filled with water and soft mud. This innovative design aims to enhance cutting blasting effects while minimizing the propagation of shock and stress waves, thereby reducing vibrations during tunnel excavation.

Claim 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. 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.

Google Patents

https://patents.google.com/patent/US12359567

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12359567