Ultra-under-excavation control energy-collecting hydraulic smooth blasting construction method for slate tunnel

A technology of smooth blasting and construction method, applied in tunnels, earth-moving drilling, mining equipment and other directions, can solve the problems of large impact of surrounding rock vibration, low blasthole retention rate, insufficient smoothness of tunnel outline, etc., and achieves easy operation. row effect

Inactive Publication Date: 2020-06-23
CHINA CONSTR FOURTH ENG DIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a construction method of energy-gathering water pressure smooth surface blasting for over- and under-excavation control of slate tunnels, so as to solve the problem of

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Embodiment Construction

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0018] Examples of the invention: see figure 1 , a slate tunnel over-under-excavation controlled energy-gathering water pressure smooth blasting construction method, comprising the following steps:

[0019] A. Comprehensive geological prediction of slate formation

[0020] Aiming at the characteristics of slate strata, a comprehensive forecasting system is established in geological forecasting which combines geological advanced drilling test analysis and tunn...

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Abstract

The invention discloses an ultra-under-excavation control energy-collecting hydraulic smooth blasting construction method for a slate tunnel. The method respectively adopts a slate rock stratum comprehensive geological prediction system, an ANSYS finite element blasting simulation analysis method, site construction III, IV and V slate rock surrounding rock blast hole optimization and an electronicdetonator millisecond blasting technology to solve the problems of insufficient contour smoothness, low blast hole retention rate, poor ultra-under-excavation control and large surrounding rock vibration influence of the slate tunnel after blasting. Good effects are obtained in the aspects of section forming and over-under-excavation control by adopting the method. The overbreak is controlled within 10%, the excavation efficiency is improved by about 15%, the explosive consumption is reduced by about 20%, the construction progress is accelerated by about 20%, and the blast hole residual rateis 70%-90%. The method is applicable to tunneling of slate rock surrounding rock tunnels of III, IV and V types of slate under the condition of karst geomorphology by adopting energy-collecting smoothblasting, and has a good reference effect on other loose flaky rocks or rocks with fully developed joints.

Description

technical field [0001] The invention relates to a construction method for over- and under-excavation controlled energy-gathering water pressure smooth surface blasting of a slate tunnel, belonging to the technical field of tunnel blasting construction in road and bridge engineering. Background technique [0002] When tunnel construction is carried out under slate geological conditions, the use of energy-concentrated water pressure smooth surface construction method is affected by the characteristics of the development of slate joints, and the effect of removing the radial compressive stress and tangential tensile stress generated by blasting in the rock mass at the moment of explosion The cutting effect is greatly affected, and the effect of the formed smooth surface is poor. The main impact is the overcut and undercut caused by smooth blasting. There is undercut in the contour line perpendicular to the slate bedding surface, and the There is serious overbreak in the contour...

Claims

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Application Information

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IPC IPC(8): E21D9/00
CPCE21D9/003E21D9/006
Inventor 董浩谢明康
Owner CHINA CONSTR FOURTH ENG DIV
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