Stress unloading, water injecting and drilling and blasting method for longitudinal structure surface structural strong rockburst regions

A longitudinally structured and structural technology, applied in blasting, earth-moving, mining equipment, etc., to improve construction safety, ensure the progress of excavation, and eliminate energy accumulation

Active Publication Date: 2012-09-26
POWERCHINA HUADONG ENG COPORATION LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no fixed construction control method for structural rockburst of longitudinal structural plane in the construction of deep underg

Method used

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  • Stress unloading, water injecting and drilling and blasting method for longitudinal structure surface structural strong rockburst regions
  • Stress unloading, water injecting and drilling and blasting method for longitudinal structure surface structural strong rockburst regions
  • Stress unloading, water injecting and drilling and blasting method for longitudinal structure surface structural strong rockburst regions

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Embodiment Construction

[0015] Such as Figure 1-Figure 3 As shown, this embodiment adopts a series of orderly working methods such as drilling, water injection, and rationally arranging blast holes in the stress concentration area, and adopts a short-footage, multi-cycle excavation method. The construction steps are as follows:

[0016] a. Drill a group of evenly and symmetrically arranged blast holes on the excavation surface, and ensure that each blast hole is located in the stress concentration area. The principle of the hole depth is to reach or pass through the stress concentration area; the number and diameter of the blast holes The principle of water injection pressure and charge is to weaken the rock mass to the greatest extent, and not excessively damage the rock mass to cause an increase in support workload. At the same time, it is necessary to consider the potential rockburst strength and the effectiveness of on-site support. The blast hole described in this example consists of two top ho...

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Abstract

The invention relates to a stress unloading, water injecting and drilling and blasting method for longitudinal structure surface structural strong rockburst regions. The invention aims to solve the longitudinal structure surface structural strong rockburst problem in the process of tunneling deep-buried tunnels (tunnels and roadways). The technical scheme is that the stress unloading, water injecting and drilling and blasting method for the longitudinal structure surface structural strong rockburst regions is characterized by comprising the following steps of: a, drilling a group of blast holes which are uniformly and symmetrically distributed in an excavation surface; b, cleaning the excavation surface by clean water once every 10 minutes, and filling water in each blast hole during the period; c, filling explosive at the bottom of top holes, filling the explosive at the bottom of middle holes, filling the explosive in side holes, and filling the explosive at the bottom of bottom holes; d, firstly blasting the top holes, the side holes and the bottom holes, then blasting the middle holes, and de-slagging after blasting; and e, sequentially repeating the steps a, b, c and d until the excavation surface fully penetrates through the whole longitudinal structure surface. The method is suitable for underground engineering such as hydropower engineering, traffic and mine, and is especially suitable for the longitudinal structure surface structural strong rockburst regions.

Description

technical field [0001] The invention relates to a stress unloading water injection drilling and blasting method in structural strong rockburst areas of longitudinal structural planes, which is mainly applicable to underground projects such as water conservancy and hydropower projects, transportation, mines, etc., and is especially suitable for structural strong rockburst areas of longitudinal structural planes. Background technique [0002] Rockburst is the destruction of surrounding rock caused by the sudden release of potential energy or strain energy accumulated in the rock mass during the excavation process of underground engineering, which can lead to casualties, damage to the working face or equipment, and its basic characteristics are sudden and violent. The longitudinal structural plane of the rock mass means that the direction of the structural plane intersects with the direction of the tunnel at a small angle, generally between 0° and 30°. The extension of the bott...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04E21D9/00
Inventor 单治钢彭鹏
Owner POWERCHINA HUADONG ENG COPORATION LTD
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