Vertical shaft grouting curtain design and grouting process under deep asymmetric stress condition

Abstract

The invention discloses a vertical shaft grouting curtain design and grouting process under a deep asymmetric stress condition, which comprises the following steps of: performing inversion to obtain a deep asymmetric stress distribution condition by adopting an on-site ground stress test and numerical simulation analysis, and establishing a vertical shaft grouting curtain mechanical model under the deep asymmetric stress condition; a physical model test and a numerical simulation test are adopted for analyzing the range of a surrounding rock blasting fracturing area and an unloading degradation area in the shaft sinking process through the drilling and blasting method, and geometric parameters of the shaft surrounding rock excavation damage range under the asymmetric stress condition are determined; the arrangement of the grouting and water plugging curtain of the deep shaft under the asymmetric stress condition is designed, the effective thickness of the grouting curtain is determined, and the ground pre-grouting drilling hole arrangement form and grouting process parameters are determined. The grouting curtain design method under the deep asymmetric stress field condition is suitable for bedrock water disaster prevention and control in shaft construction in the western deep well mining field in China, and it can be guaranteed that under the deep asymmetric stress field condition, a large-section vertical shaft constructed through a drilling and blasting method safely penetrates through a bedrock aquifer.

Description

technical field [0001] The invention relates to the technical field of prevention and control of high-pressure water hazards in deep mine shaft bedrock. Specifically, it is a vertical shaft grouting curtain design and grouting process under the condition of deep asymmetrical stress. Background technique [0002] With the depletion of shallow resources, my country has accelerated the process of mining deep mineral resources. Deep mining requires the construction of vertical shaft shafts from the ground to the ore seam. Due to the very harsh geological environment faced by deep engineering, high-pressure water damage in the bedrock section of the shaft seriously restricts the safe and rapid construction of deep shafts. At present, pre-grouting technology is generally used to prevent water damage in wellbore bedrock, and a closed grouting water blocking curtain is formed along the wellbore. Due to the influence of geological tectonic movement, the in-situ stress in western m...

AI Technical Summary

Problems solved by technology

Because the grouting curtain design of the traditional vertical shaft only considers the axisymmetric stress condition, the failure depth of the grouting curtain and the grout diffusion distance during the sinking process mainly depend on engineering experience, which cannot meet the needs of wellbore water prevention and control under the asymmetric stress condition of deep mining.

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