Abstract
The displacement of the cross section directly reflects the stress state and stability of the surrounding rock and structure, so the monitoring of it is essential during the construction and operation of the tunnel and underground engineering, particularly under the conditions of earthquake and other geological disasters. This paper introduces a new contact tunnel profile monitoring system (TPMS) in detail that uses a tilt sensor and a displacement sensor as data acquisition devices. According to the relation between the sensing physical quantity and displacement change, the displacement calculation formulas of the tunnel cross section measuring points based on the two-dimensional plane coordinate system were deduced, and in order to eliminate the actual installation and positioning deviation of the monitoring system, the method of obtaining the optimal monitoring plane and converting coordinates of the measuring points was proposed, thus establishing the theoretical basis for the application of the TPMS. With the Beishan exploration tunnel (BET) in China as the test platform, the TPMS was successfully applied for long-term monitoring. The application experience showed that the TPMS can realize continuous monitoring, automatic collection and transmission of the monitoring data, remote access whenever necessary, without affecting the transportation in the tunnel, and high accuracy, which reaches 0.01 mm. This system provides a new simple and effective method with good generality and applicability for the deformation monitoring of the tunnel and underground engineering.
Highlights
During the construction and operation of the tunnel and underground engineering, it is crucial to guarantee the safety and stability of the surrounding rock and structure. e convergence displacement of the surrounding rock directly reflects the stability of a rock mass after excavation [1, 2] and provides support for the inversion of the rock mechanics parameters and the determination of a reasonable support time. erefore, convergence displacement monitoring of the surrounding rock and structure is an essential item for underground engineering deformation monitoring, and the applicability of monitoring methods and systems is of vital importance to guaranteeing safety during tunnel and underground engineering construction and operation
Contact monitoring methods that are used to measure the convergence displacement mainly include a convergence meter and a convergence measurement system [13,14,15,16]. e convergence meter is a measurement instrument specially used to monitor the distance change between any two points on the wall of the tunnel or other engineering surrounding rock. is instrument has a digital display and vibrating-wire convergence meter and is widely used to measure the convergence deformation of tunnels and underground engineering. e Bassett convergence system (BCS) is a representative convergence measurement system that uses a tilt sensor and a long and short arm structure to transfer the displacement between measuring points in order to obtain the relative displacement between these points
A new contact tunnel profile monitoring system (TPMS) was introduced in detail, and the method of obtaining the optimal monitoring plane and converting coordinates of the measuring points was established to eliminate the actual installation and positioning deviation of the monitoring system. e displacement calculation formulas of the tunnel cross section measuring points based on the two-dimensional plane coordinate system were proposed, providing a theoretical basis for the popularization and application of this monitoring system
Summary
Received 29 October 2020; Revised 13 November 2020; Accepted 12 December 2020; Published 19 December 2020. E displacement of the cross section directly reflects the stress state and stability of the surrounding rock and structure, so the monitoring of it is essential during the construction and operation of the tunnel and underground engineering, under the conditions of earthquake and other geological disasters. Is paper introduces a new contact tunnel profile monitoring system (TPMS) in detail that uses a tilt sensor and a displacement sensor as data acquisition devices. Is system provides a new simple and effective method with good generality and applicability for the deformation monitoring of the tunnel and underground engineering With the Beishan exploration tunnel (BET) in China as the test platform, the TPMS was successfully applied for long-term monitoring. e application experience showed that the TPMS can realize continuous monitoring, automatic collection and transmission of the monitoring data, remote access whenever necessary, without affecting the transportation in the tunnel, and high accuracy, which reaches 0.01 mm. is system provides a new simple and effective method with good generality and applicability for the deformation monitoring of the tunnel and underground engineering
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