A method for detecting the collapse of the surrounding rock behind the tbm shield

Abstract

The invention discloses a method for detecting the collapse of surrounding rock at the back of a TBM shield. The method includes: acquiring the coordinates of the center point of a cutter head during TBM excavation, and establishing an ideal opening for TBM construction in a construction coordinate system according to the coordinates of the center point of the cutter head. Excavate the contour surface model; obtain the measured point cloud data of the surrounding rock behind the shield during the excavation of TBM, and establish the actual excavation contour surface model under the construction coordinate system according to the measured point cloud data; the ideal excavation contour surface model Comparing with the actual excavation contour surface model, the landslide amount of the surrounding rock of the cave wall is calculated. Compared with the ideal excavation contour surface model established by the design curve and contour parameters in the general method, the ideal excavation contour surface model established in the present invention is closer to the actual situation, and can further improve the accuracy of landslide calculation.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a method for detecting the collapse of surrounding rock of a cave wall behind a TBM shield. Background technique [0002] TBM (Tunnel Boring Machine) refers to the tunnel boring machine. When the TBM construction tunnel passes through the weak and broken strata, it is easy to encounter unfavorable geological phenomena such as loose and broken surrounding rock, development of joints and fissures in the rock mass, and development of groundwater, and the integrity of the surrounding rock is poor. The self-stabilizing ability is insufficient, and the phenomenon of surrounding rock collapse may occur during the construction process. The phenomenon of surrounding rock collapse may cause the TBM to jam, causing serious personal and property losses, greatly increasing construction costs, delaying the construction period, and causing casualties and mechanical damage, which is extremely ...

AI Technical Summary

Problems solved by technology

Through field practice, it is found that there are mechanical equipment such as rock bolts, support shoes, main beams, belt conveyors and other mechanical equipment in the main engine area behind the TBM shield. Traditional detection methods are not suitable for TBM construction tunnels

In addition, most of the existing collapse detection methods rely on the design curve and design section parameters to establish the design excavation contour surface model, and the TBM excavation process often deviates from the design curve, which makes the design excavation contour surface model established by the traditional collapse detection method different from the actual excavation contour surface model. Excavation contour surface model There is a certain deviation in the actual excavation contour surface model, which affects the accuracy of the calculation results of landslide volume

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