Advanced monitoring device for tunnel excavation surrounding rock whole process deformation curve and implementation method thereof

Abstract

The invention discloses an advanced monitoring device for a tunnel excavation surrounding rock whole process deformation curve and an implementation method thereof. The device comprises a steel tube elastomer, a height difference meter structure and embedded optical fibers, wherein the height difference meters form an equidistant series structure and are fixed in the steel tube; the embedded optical fibers are packaged in grooves on the surface of the steel tube; the height difference meters, the embedded optical fibers and the steel tube form a deformation coordination structure, and throughcalculating height difference changes and optical fiber deformation conditions, the surrounding rock deformation can be calculated. The implementation method comprises steps of drilling, steel tube mounting, height difference meter assembling, embedded optical fiber packaging and borehole sealing and grouting. The deformation curve of the surrounding rock in front of the tunnel excavation face canbe tested and calculated, which provides support for dynamic design, construction and safety of the project.

Description

technical field [0001] The invention relates to the field of measurement and control of surrounding rock deformation in underground engineering, in particular to an advanced monitoring device and method for the deformation curve of surrounding rock during tunnel excavation. Background technique [0002] Tunnel engineering is generally large in scale, and the engineering geological conditions are complex. During the excavation of the rock mass (surrounding rock), the surrounding rock mass (surrounding rock) is deformed due to stress readjustment. The stability of surrounding rock is affected by many factors. Engineering practice shows that the deformation of tunnel surrounding rock during construction plays an important role in evaluating the stability of tunnel surrounding rock and selecting tunnel support parameters. At present, the deformation monitoring of tunnels mainly focuses on rock mass displacement and convergence settlement. The measuring instruments used mainly in...

AI Technical Summary

Problems solved by technology

At present, the deformation monitoring of tunnels mainly focuses on rock mass displacement and convergence settlement. The measuring instruments used mainly include conventional measuring equipment such as level, theodolite, total station and photogrammetry equipment. The measurement accuracy is high, but there are the following disadvantages : (1) All are point-based measurements, and the layout of the points is random. Although increasing the number of measuring points can improve reliability, it will greatly increase the cost, and the layout of the measuring points is greatly affected by the construction organization in the cave; (2) There are many measurement objects It is the deformation of the inner wall of the tunnel, and cannot reflect the deformation of the surrounding rock; (3) The measurement is only for the excavated tunnel section, and cannot be used for the deformation of the tunnel section that has not been excavated or is being excavated before the tunnel face is excavated. Monitoring, the measured value is not the value of the entire deformation stage of the surrounding rock, and cannot reflect the real deformation characteristics of the surrounding rock, which is particularly important in the analysis and evaluation of the stability of the surrounding rock and the design of cavern support

Images