Monitoring instrument and method for deformation of tunnel surrounding rocks

Abstract

The invention discloses a monitoring instrument and method for deformation of tunnel surrounding rocks. Displacement transmission rods of the monitoring instrument include a steel bar and multiple layers of steel pipes, wherein the steel pipes are sleeved on the steel bar, and the lengths of the steel pipes decrease layer by layer; steel rings are respectively welded at a position 10cm from the top of the steel bar, the tops of the steel pipes, and positions 10cm from the tops of the steel bars; a PVC (Polyvinyl Chloride) plastic pipe is sleeved on the exposed portion, which is not embedded into the adjacent steel pipe, of each steel pipe, and the PVC plastic pipe abuts against the top of the adjacent steel pipe; and the tail end of the PVC plastic pipe of the outermost steel pipe is equipped with an external sleeve, a probe is welded at the top of the external sleeve, measuring holes are formed in the probe, the number of the measuring holes equals that of the displacement transmission rods, and the size of measuring holes is consistent with that of a measuring rod of an electronic indicating gauge. According to the invention, the displacement transmission rods make point-to-point contact with the rocks, thereby ensuring firmness of the different contact points, preventing the displacement transmission rods from being disengaged from the rocks, and reducing the influence of the monitoring instrument on the rock displacement result to the largest extent. The monitoring instrument and method of the invention have good environmental adaptability, and operation is simple.

Description

technical field [0001] The invention relates to a monitoring instrument and a monitoring method for surrounding rock deformation of a tunnel. Background technique [0002] With the rapid development of my country's economy, more and more tunnels are excavated, and the deformation of the surrounding rock of the tunnel is one of the most concerned issues in the tunnel engineering construction. [0003] After the tunnel is excavated, due to the change of its stress state, the stress balance state before excavation is broken, and the surrounding rock will reach a new balance through deformation and stress adjustment. This adjustment is a dynamic process, so the deformation of the surrounding rock is also a dynamic process. The deformation trend of the surrounding rock should be grasped through the dynamic information of the surrounding rock deformation, that is, the displacement-time curve obtained from the measurement, and the total displacement at each time , Displacement vel...

AI Technical Summary

Problems solved by technology

Especially for the displacement monitoring of hard rock, the short-term displacement is very small. If the accuracy of the instrument is not enough, the monitoring result will be inaccurate

[0007] 2. High requirements for automation

[0018] (3) Feedback of deformation monitoring information

But at present, due to various reasons, the monitoring data often does not play its due role in the selection of support time

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