Early deformation monitoring method for large-section underground caverns based on segmental fine measurement

Abstract

The invention discloses a method for monitoring early deformation of large-section underground caverns on the basis of accurate zone measurement, and belongs to the ranges of technologies for measuring deformation of underground caverns during geotechnical engineering. The method includes mounting zone accurate measurement devices including a laser measurement module, a rotation mechanism, a quick mounting plate and a base; accurately measuring concerned positions of section sides of the caverns zones by zones by the aid of the zone accurate measurement devices in different durations, splicing zone measurement data obtained in the different durations and directly comparing and computing the direct zones to obtain deformation vectors of the concerned positions. The method has the advantages that the early deformation of the large-section underground caverns can be monitored, the zone accurate measurement devices are small, are easy and convenient to use and free of target points, influence of blasting and accurate centering and can be quickly mounted adjacent to tunnel faces, the method is particularly applicable to monitoring early deformation of underground spaces excavated by the aid of drilling and blasting processes, and the like.

Description

technical field [0001] The invention belongs to the technical scope of deformation measurement of underground caverns in geotechnical engineering, and in particular relates to an early deformation monitoring method of large-section underground caverns based on section fine measurement. Background technique [0002] The design and construction of underground caverns need to adjust the design parameters and construction technology in real time according to the physical and mechanical properties of the excavated rock mass. The most direct and effective method to identify the performance of excavated rock mass is early deformation monitoring. In fact, before the excavation of the tunnel face, the surrounding rock has already undergone about 30% deformation; after the excavation of the face and the first deformation measurement, another 30% to 50% deformation occurred. Therefore, in order to capture as much deformation information of the rock mass as possible, it is urgent to es...

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Problems solved by technology

[0006] Although these methods can carry out deformation measurement under non-reflective targets, due to the inability to accurately center the measurement point, it is impossible to guarantee the consistency of the measurement points at different time intervals, especially in underground caverns excavated by long-span drilling and blasting methods. The surface of the rock mass is uneven. Even if the measurement angle error is 0.05 degrees, the measurement point will deviate from the real measurement position by as much as 26mm (the measurement distance is 30m). Therefore, the above method cannot well complete the early deformation monitoring of large-span underground caverns.

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