Construction method of super-long expansion head anchor cable of large deformation tunnel with high ground stress and weak surrounding rock

A technology of weak surrounding rock and high in-situ stress, applied in earth-moving drilling, installation of bolts, mining equipment, etc., can solve the problems of long in-situ stress release period, secondary lining cracking, shotcrete cracking, etc., and achieve significant economic benefits and savings Engineering materials, the effect of improving the stress state

Inactive Publication Date: 2019-04-02
吴占瑞
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After excavation and support, the large-deformation tunnel with weak surrounding rock and high ground stress has strong extrusion and deformation of the surrounding rock, resulting in large-scale damage to the primary support, cracking of shotcrete, twisted and broken steel frames, and encroachment of side walls. The release in the surrounding rock tunnel is often a long-term and slow process, and it will also cause the secondary lining that h

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Construction method of super-long expansion head anchor cable of large deformation tunnel with high ground stress and weak surrounding rock
  • Construction method of super-long expansion head anchor cable of large deformation tunnel with high ground stress and weak surrounding rock
  • Construction method of super-long expansion head anchor cable of large deformation tunnel with high ground stress and weak surrounding rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] In order to enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] Such as figure 1 , figure 2 , image 3 As shown, the construction method of the super-long enlarged head anchor cable for the tunnel with high ground stress, weak surrounding rock and large deformation includes the following steps:

[0039] 1. Preparation before construction

[0040] (1) Carry out equipment matching, rationally organize labor, and purchase qualified construction materials;

[0041] (2) Calibrate the tension jack, high-pressure oil pump, and pressure gauge to ensure that they can meet the construction needs, and draw the pressure gauge reading-tension relationship curve to guide the on-site tensioning operation;

[0042] (3) Prepare enough materials according to the design quantity, and sample steel strands and anchors for mech...

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

PUM

PropertyMeasurementUnit
Lengthaaaaaaaaaa
Lengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a construction method of a super-long expansion head anchor cable of a large deformation tunnel with high ground stress and weak surrounding rock, and belongs to the field of tunnel construction. The construction method includes the following steps that drilling is performed; anchor cable braiding is performed, specifically, the anchor cable is formed by braiding steel strands, and the cross-sectional dimension of an anchor cable expansion head is larger than the cross-sectional dimension of other parts of the anchor cable; the anchor cable is installed, specifically, the anchor cable is disposed at the drilling center during installation; anchoring section grouting is performed; tensioning and locking are performed; tensioning section grouting is performed; and anchor sealing is performed. The construction method adopts the stress super-long expansion head anchor cable, the construction is convenient and fast, since the release of the high ground stress is a long-term process, the pre-stress super-long expansion head anchor cable can well reinforce the continuous deformation of the surrounding rock, and the number of times of operation of initial support arch replacement and second lining rework and replacement is greatly reduced; and meanwhile, the huge number of manpower and material resources required by a conventional support method can be avoided,and the progress of project is improved.

Description

Technical field [0001] The invention relates to the field of tunnel construction, in particular, is a method for the construction of an ultra-long expansion head anchor cable for a large deformation tunnel with high ground stress and weak surrounding rock. The method is suitable for soft surrounding rock tunnels, karst tunnels, deep foundation pit projects, and high slope projects. Wait. Background technique [0002] High in-situ stress has a significant impact on geotechnical engineering, especially for underground engineering with large buried depth and weak surrounding rock, such as railway tunnels, highway tunnels, and deep mining tunnels. With the continuous development of my country's railway and highway construction, tunnel engineering has developed in the direction of growth and deep burial. Therefore, in recent years, there have been continuous emergence of long and large tunnel projects in weak surrounding rocks that pass through high ground stress areas and have harsh...

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

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): E21D20/00E21D20/02
CPCE21D20/003E21D20/02
Inventor 吴占瑞
Owner 吴占瑞
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products