Automatic shield tunnel earth surface sedimentation monitoring and pre-warning system and method

Abstract

The invention provides anautomatic shield tunnel earth surface sedimentation monitoring and pre-warning system. The automatic shield tunnel earth surface sedimentation monitoring and pre-warning system comprises an automatic collecting system and a pre-warning system, the automatic collecting system senses shield earth surface sedimentation and generates corresponding electric signals, and the pre-warning system can receive electric signal data and automatically performs early warning under a preset condition. In the advancing process of a shield machine under a normal fluctuant working condition, sample time history curve initial values of a plurality of monitoring points at different distances from a cutter head are measured in advance, envelope curves of samples are adopted as an upperlimit and a lower limit of a standard time history curve,the upper limit and the lower limit of the standard time history curve are treated as sedimentation range values of a pre-warning procedure ofthe pre-warning system, when a working condition of the shield machine needs to be adjusted, the shield tunnel earth surface sedimentation automatic monitoring and pre-warning systems are distributedat the monitoring points at different positions on a tunnel axis earth surface in front of the cutter head corresponding to the standard time history curve, and when the pre-warning system receives amonitoring value exceeding the standard time history curve upper limit and the standard time history curve lower limit, the pre-warning system automatically performs early warning.

Description

technical field [0001] The invention relates to the field of shield tunnel surface settlement monitoring, in particular to an automatic monitoring and early warning system and early warning method for shield tunnel surface settlement. Background technique [0002] The construction technology of shield method is the key technology of subway construction project. With the continuous construction of rail transit, shield construction has occupied a place in urban rail transit construction because of its fast and safe construction. However, shield surface settlement has also become a problem that cannot be ignored. Although there are relevant monitoring methods for surface settlement at present, most of them have complex structures and cannot be monitored dynamically at any time. It is impossible to analyze, guide construction, and adjust working conditions based on real-time monitoring data. [0003] In view of the objective problems faced by the construction of large-diameter s...

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Problems solved by technology

However, the surface settlement of shield tunneling has also become a problem that cannot be ignored. Although there are relevant monitoring methods for surface settlement at present, most of them have complex structures and cannot be monitored dynamically at any time. It is impossible to analyze, guide construction and adjust working conditions based on real-time monitoring data.

[0003] In view of the objective problems faced by the construction of large-diameter shield tunnels on the Beijing New Airport Line, such as long tunnel sections, complicated soil passages, and large tunnel diameters (8.8m), it is often necessary to adjust the shield machine during the advancement of the shield machine. In the process of working condition adjustment, unreasonable parameter adjustment is likely to occur, such as excessive thrust, low earth pressure and actual underpressure propulsion. Once the parameters are unreasonable, excessive surface subsidence or even subsidence may occur

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