Construction method of high ground stress and basalt underground factory building cavern

A technology for underground powerhouses and high ground stress, which is applied to underground chambers, earthwork drilling, wellbore lining, etc. It can solve problems such as unfavorable surrounding rock stability and safety, looseness and collapse, and complex structures, so as to facilitate timely and rapid follow-up, reduce Effect of stress failure and reduction of blast disturbance
CN109488309AInactive Publication Date: 2019-03-19SINOHYDRO BUREAU 7 CO LTD
7 Cites 3 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SINOHYDRO BUREAU 7 CO LTD
Publication Date
2019-03-19
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses an excavation construction method of a high ground stress and basalt underground factory building cavern, which comprises the following steps of: carrying out layered horizontal pushing construction on a middle part, and carrying out reserved excavation construction on protective layers at two sides; wherein, the middle part has a layer height of 4.0+ / -0.5m, the width of each protective layer is 5+ / -0.5m, a pre-cracking hole is arranged between the upper protective layer and the lower protective layer and the middle layered horizontal pushing, the pre-cracking hole adopts two layers of middle layered pre-cracking blasting, when the excavation construction of the protective layers on the two sides are finished, the system support construction is completed in time. According to the invention, a middle layered excavation mode is adopted, so that the blasting scale can be reduced, and the disturbance to the surrounding rock can be reduced; the pre-cracking hole is arranged between the protective layer and the middle layered horizontal pushing, so that the damage of blasting vibration to a side wall can be reduced, and the stress release is facilitated; the protective layers are reserved on both sides, so that the stress adjustment and relaxation deformation of the excavation surface occur in the protective layers, a permanent side wall cannot be influenced,the excavation work amount of the protective layers is small, the completion time is short, the support can be followed in time, and the influence of bad geology on the stability of the surrounding rock of a high side wall can be effectively controlled.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of water conservancy and hydropower engineering, in particular to the technical field of machine pit excavation for underground powerhouses, and specifically relates to a construction method for underground powerhouse caverns under high ground stress and basalt geological conditions. Background technique

[0002] The caverns of underground powerhouses generally have the characteristics of large spans, high side walls, complex structures, and prominent stability problems in surrounding rocks. Due to the influence of high ground stress during excavation, high side walls loosen and collapse seriously. Traditional excavation techniques often use side walls Excavation is carried out by means of deep hole pre-splitting on the structural surface + blasting in the middle section. The deep hole pre-splitting blasting on the structural surface of the side wall has a certain impact on the stability of the surrounding ro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More