Safety detection device and system for fiber grating composite structure tunnel surrounding rocks

Abstract

The invention discloses a safety detection device and system for fiber grating composite structure tunnel surrounding rocks, and belongs to the technical field of safety detection of tunnel surrounding rocks. The technical problem to be solved is to provide the improvement of a hardware structure of the safety detection device for the fiber grating composite structure tunnel surrounding rocks. The safety detection device for solving the technical problem comprises a three-dimensional vibration sensing module, an axial pressure sensing module, radial pressure sensing modules, a flow velocity and flow sensing module and a transmission optical fiber which are arranged in an optical fiber grating protection shell, wherein the tail end of the transmission optical fiber is connected into an optical fiber deconcentrator through a flange interface, and the output end of the optical fiber deconcentrator is connected with a wireless transmission module and an external flange interface; the transmission optical fiber is divided into four paths, each path is connected with the radial pressure sensing modules which are evenly distributed in the upper, lower, left and right directions of an anchor rod, and one path is further connected with the three-dimensional vibration sensing module, the axial pressure sensing module and the flow velocity and flow sensing module. The safety detection device is applied to tunnel surrounding rocks.

Description

technical field [0001] The invention discloses a safety detection device and system for the surrounding rock of a fiber grating composite structure tunnel, and belongs to the technical field of safety detection of the surrounding rock of a fiber grating composite structure tunnel. Background technique [0002] Fiber grating is essentially a passive filter formed by periodically modulating the refractive index of the fiber core. Fiber Bragg grating has the following advantages: strong anti-electromagnetic interference ability, the optical fiber will not be disturbed by electromagnetic waves during transmission; small size, fiber Bragg grating is fully compatible with optical fiber; long transmission distance, high precision, measurement accuracy is not affected by light intensity, Easy networking measurement and integration. Therefore, it has been widely used in the field of optical fiber communication and sensing. [0003] There are many mountainous areas in my country, an...

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Problems solved by technology

[0004] At present, bolts are often used to detect the force of surrounding rock in tunnel construction, but the structure of conventional bolts is single, and there is no effective detection of axial strain, and the water inflow of surrounding rock depends on the observation of field technicians to make subjective judgments , the measurement of vibration is usually an independent measurement, lack of real-time synchronization with the strain measurement point, it is difficult to collect the strain and water gushing status of the tunnel surrounding rock in time after the vibration occurs

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