Deep underground tunnel ventilation shaft supporting structure

Abstract

The invention provides a deep underground tunnel ventilation shaft supporting structure. The deep underground tunnel ventilation shaft supporting structure comprises a middle partition wall, steel stand columns, corrugated steel supports, concrete reinforcing rings and a high-molecular polymer grouting layer. The whole corrugated steel supports are of a vertical cylindrical structure, a plurality of corrugated steel supports are coaxial and are vertically arranged at intervals, the concrete reinforcing rings are arranged between the adjacent corrugated steel supports, the concrete reinforcing rings and the corrugated steel supports are coaxial, the middle partition wall is vertically arranged in the middle positions in the plurality of corrugated steel supports, and the left end and the right end of the middle partition wall are each provided with one vertical steel stand column and are fixedly connected with a steel ring beam through the steel stand columns. The high-molecular polymer grouting layer is arranged between the corrugated steel supports and shaft wall surrounding rock. The deep underground tunnel ventilation shaft supporting structure can be closed in time to form a ring, construction is convenient, surrounding rock can be rapidly closed and grouted on a complex surrounding rock section, surrounding rock collapse and deformation are restrained, and high safety, timeliness and economic efficiency are achieved.

Description

technical field [0001] The invention relates to the field of surrounding rock support in underground spaces, in particular to the support technology for ventilation shafts, in particular to a support structure for ventilation shafts in deep underground tunnels. Background technique [0002] During the construction and operation of deep underground tunnels, it is necessary to excavate a shaft with a large diameter vertically downward from the surface for personnel access, tunnel ventilation and other functions, which play an important role in both the construction period and the operation period. If the shaft is constructed using the front shaft method, construction can be started at both ends of the tunnel at the same time, which can solve the problem of ventilation in the main tunnel and the problem of early penetration of key lines, and speed up the overall construction progress of the project. According to the requirements of relevant design specifications, the diameter o...

AI Technical Summary

Problems solved by technology

However, in areas with complex geological conditions, especially in areas where the surrounding rock is severely weathered, joints and fissures are developed, the rock mass is relatively broken, and the rock mass is rich in water, if there is water gushing in the well during excavation, it will bring great difficulties to the construction.

In addition, the surrounding rock is soft rock, which is unstable, changes rapidly, easily softens and collapses when exposed to water, and is prone to large deformation, which is another major problem in shaft construction.

For water-rich areas and complex geological conditions, the initial strength of the traditional anchor-sprayed support is slow, and the construction difficulty is increased, which greatly increases the safety hazard

Images