Unlock instant, AI-driven research and patent intelligence for your innovation.

Continuous alternating tunnel face advanced anchor bolt layout method

A face, alternating technology, applied in the installation of bolts, mining equipment, earth-moving drilling and other directions, can solve the problems of increasing the cost of lap length support and reducing the economic benefits of support, and achieve a stable and strong support. The effect of practicality and broad application prospects

Active Publication Date: 2020-11-06
FUZHOU UNIVERSITY
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase in the length of the lap will lead to a sharp increase in support costs, and ultimately reduce the economic benefits of support

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
  • Continuous alternating tunnel face advanced anchor bolt layout method
  • Continuous alternating tunnel face advanced anchor bolt layout method
  • Continuous alternating tunnel face advanced anchor bolt layout method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] In this embodiment, the specific engineering data are as follows: the tunnel is excavated in full section, the single excavation footage is 2m, the maximum excavation height of the tunnel face is about 11m, the maximum excavation span is about 13m, and the excavation cross-sectional area is about 115m 2 .

[0025] In the existing technology, when the anchor bolts ahead of the tunnel face are laid according to the conventional scheme, the bolt support length will be continuously shortened with the excavation of the tunnel, see figure 1 , there is an obvious weakening process of the support effect, which is very unfavorable for the deformation control of the face. In order to solve this problem, the present invention provides a method for laying out advance bolts on the tunnel face in a continuous and alternating manner. It inc...

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

No PUM Login to View More

Abstract

The invention relates to a continuous alternating tunnel face advanced anchor bolt layout method. The method includes the steps that (1) the supporting length, supporting density, and plane layout points of face advanced anchor bolts are determined; (2) the plane layout points of the face advanced anchor bolts are equally divided into K parts, and the anchor bolt layout points of each part are obtained; (3) the anchor bolts different in length are constructed at the anchor bolt layout points of the K parts, so that the face tends to be stable under supporting of the anchor bolts different in length, wherein tunnel single-time excavation footage serves as the gradient, and the maximum length of the anchor bolts is the supporting length; (4) the face continues to be excavated, part of the anchor bolts at the anchor bolt layout points are excavated with excavation of the face, and then the anchor bolts with the length equal to the supporting length are constructed on the part again; and (5) step (4) is repeated, so that the face is always under protection of the anchor bolts different in length until tunnel face advanced anchor bolt supporting is completed. The method is beneficial toimproving the stability of the tunnel face anchor bolt supporting effect.

Description

technical field [0001] The invention belongs to the field of tunnel engineering, and in particular relates to a method for arranging advanced bolts on the face of a continuous and alternating tunnel face. Background technique [0002] The stability of the tunnel face is the basic prerequisite for the safe construction of the tunnel. However, in tunnels with weak surrounding rocks, face instability frequently occurs, seriously threatening construction safety. The advance bolt of the tunnel face is an important support means to improve the stability of the tunnel face. The main parameters of its conventional layout scheme include the support length, support density and lap length. [0003] According to the laying method of the conventional scheme, the anchor bolts ahead of the tunnel face will be continuously cut off as the tunnel excavation progresses, and the corresponding support effect on the tunnel face will gradually weaken until the support length of the anchor bolts i...

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): E21D20/00
CPCE21D20/00
Inventor 吴学震郑超邓涛蒋宇静关振长
Owner FUZHOU UNIVERSITY