Tunnel wall rock deformation monitoring method and monitoring system thereof

Abstract

The invention relates to a tunnel surrounding rock deformation monitoring method and a monitoring system thereof. The monitoring method is as below: (1) firstly, a laser is fixed on the inner wall of a stabilized tunnel surrounding rock, then a fixed photosensitive displacement signal monitor is arranged on a preliminary bracing of an unstable surrounding rock in the constructed tunnel, and the signal output end of the laser is opposite to the signal receiving end of the photosensitive displacement signal monitor; (2) during the monitoring, the laser sends a real-time laser signal to the photosensitive displacement signal monitor used for receiving laser signals, and in the monitoring process, the photosensitive displacement signal monitor sends monitoring data on the deformation displacement of the unstable surrounding rock to a signal processing terminal; and (3) the signal processing terminal performs automatic analysis according to collected data, and when the deformation displacement value of the surrounding rock reaches or exceeds a dangerous deformation value, the signal processing terminal sends an alarm signal via an alarming system. The method and the system thereof are favorable for reducing and avoiding casualty and loss caused by serious tunnel and laneway collapse so as to improve the construction safety.

Description

Technical field: [0001] The invention relates to a monitoring method and a monitoring system for surrounding rock deformation of a tunnel. Background technique: [0002] With the rapid development of national construction, the current highway and railway tunnels have some new features: large cross-section, long tunnel, complex geological conditions, and unfavorable ground conditions in front of the tunnel excavation face can easily cause tunnel collapse and water gushing. These factors not only bring great difficulties to tunnel construction technically, but also often cause personal casualties and delays in construction due to unexpected accidents, resulting in huge economic losses. [0003] For example, on August 16, 2007, the Ministry of Railways and the State Administration of Work Safety jointly issued the "Notice on the Major Water and Mud Inrush Accident in the "8.5" Construction of the Yesanguan Tunnel on the Yiwan Railway". According to the report, at about 1 am on...

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Problems solved by technology

[0004] Another example is that at 15:20 on November 15, 2008, a ground subsidence accident occurred at the construction site (open-pit excavation) of the Xianghu Station section of Hangzhou Metro Line 1, causing 11 vehicles driving here to sink and collapse. (2 people on board were slightly injured, and the rest escaped safely), 7 construction workers were killed and 14 were missing

After a preliminary analysis, the accident exposed five problems: the enterprise's safety production responsibility was not implemented, and the management was not in place; the management of the discovered accident hazards was not firm, timely, and thorough; Forms, or even work without training; labor management is not standardized, and on-site management is chaotic; relevant departments of the local government are ineffective in supervision

[0007] However, due to the unstable physical state of the reference point in the total station method, the coordinate error of the survey point is very large, and the adjustment process is not carried out during the observation process, so the coordinate error of the observation point is >±1.0mm

For tunnel clearance deformation monitoring, it cannot meet the accuracy requirements

And due to various objective external conditions such as measuring personnel, measuring equipment, and test components, there are inevitably various errors or errors in the first-hand data obtained on site.

[0008] In short, at present, the domestic tunnel surrounding rock monitoring, firstly, the contact measurement method is generally used, which is inefficient, consumes a lot of manpower and financial resources, and the observation effect is not good, and there is a problem that the monitoring results are distorted due to the excessive influence of human factors; the second is Some use the more advanced BJSD-3 laser tunnel section detector, total station, etc., but they do not have automatic alarm function, cannot monitor in real time, and there are also human influences.

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