Smooth blasting method for controlling flatness of profile surface for underground chamber

Abstract

The invention discloses a smooth blasting method for controlling flatness of profile surface for an underground chamber. The method comprises the following steps: 1) organizing topic task force to investigate on site according to the over-under-excavation phenomenon in a practical construction effect, and collecting site pictures; 2) carrying out mathematical analysis and evaluation to ensure that a smooth blasting effect is achieved; 3) analyzing key parameters determining smooth blasting, wherein the key parameters comprise hole spacing of peripheral holes, minimum resistant line, close coefficients of the peripheral holes, charge quantity and charging structure of the peripheral holes, blasting interval and the like; 4) calculating the hole spacing of the peripheral holes of the underground chamber according to fluid-dynamic theory; 5) making specific countermeasures and implementation plans under the combination of field investigation, test data and theoretical analysis results; and 6) checking the smooth blasting effect. The method has the characteristics of saving construction cost, improving construction quality and improving economic benefit, and is applicable to smooth blasting of the underground chamber in the fields of water conservancy and hydropower engineering , tunnel engineering, underground space structure and the like.

Description

technical field [0001] The invention relates to an underground chamber smooth surface blasting method for controlling the flatness of contour surfaces, and belongs to the technical fields of engineering blasting and rock mechanics. Background technique [0002] In recent years, with the acceleration of my country's infrastructure construction process and the deepening implementation of the western development strategy, water conservancy and hydropower projects, tunnel projects and underground space structure projects are increasing. New forms faced by the field of underground chamber construction. [0003] Explosives can release huge energy at the moment of explosion, so blasting technology is widely used in water conservancy, mining, transportation and construction engineering and other fields. Explosives can release a large amount of energy in a short period of time when they explode, making them widely used in national economic construction fields such as mines, water con...

AI Technical Summary

Problems solved by technology

However, smooth blasting has always been a key technical issue in the safe production of underground chambers. In the actual implementation process, due to the heterogeneity, discontinuity and anisotropy of rock, the research on the mechanism of smooth blasting is insufficient, and the blasting parameters are mostly Influenced by factors such as the determination of engineering experience, over- and under-excavation usually occur on the actual construction site, resulting in poor straightness of the contour surface of the underground chamber, which has caused great losses to the engineering construction

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