Method and system for determining yielding support opportunity of hard rock deep vertical well shaft

Abstract

The invention discloses a method for determining a yielding support opportunity for a hard rock deep vertical well shaft, and belongs to the technical field of underground engineering. By reasonably determining the duration and conversion opportunity of temporary support and permanent support of the vertical well shaft, stress in surrounding rock is fully released, the bearing capacity of the surrounding rock is exerted and utilized, and low-pressure or pressure-free bearing of a well wall structure is achieved. The method comprises the following steps that a support scheme is determined, andthe support rigidity and the maximum bearing capacity of a combined support body are obtained; a shaft surrounding rock deformation characteristic curve GRC is obtained where the pressure in the surrounding rock is the bearing capacity of the combined support body, the surrounding rock deformation amount corresponding to the maximum bearing capacity of the combined support body is obtained, and atemporary support opportunity is obtained according to the surrounding rock deformation amount corresponding to the maximum bearing capacity of the combined support body; and the relationship among the support bearing capacity, the supporting rigidity and the surrounding rock deformation amount of the combined support body are obtained, and a permanent support opportunity is determined when the temporary supporting and the surrounding rock deformation amount reach a balance.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and in particular relates to a method and a system for determining the timing of yielding support of a hard rock deep shaft. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] my country's metal mine shaft construction has entered the 1500m deep stage. The existing 1526.5m 3# shaft of Huize Lead-Zinc Mine in Yunnan is in operation, and there are many other 1500m-1700m deep shafts under construction or equipment. In the next 5-10 years, my country's shafts will The construction will fully enter the depth range of 1500m ~ 2000m, and the diameter of the wellbore will be within 10m, and it will be mainly distributed in steel, gold, nonferrous metals and other industries. Different from the construction of shallow shafts, the construction of deep shafts in hard ...

AI Technical Summary

Problems solved by technology

[0004] The inventor found in the research and development process that it is a technical problem to determine the timing of temporary support and permanent support for deep shaft yielding under high stress conditions. At present, there is no clear and operable method, and most of them stay at the stage of theoretical research. The introduced The convergence constraint method used in the tunnel support process to determine the support timing requires the establishment of a longitudinal section characteristic curve, which has the characteristics of cumbersome calculations and difficulties in determining the initial radial deformation and final deformation of the surrounding rock.

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