Distributed optical fiber monitoring system for failure monitoring of deep rock mass

A distributed optical fiber monitoring system for failure monitoring of a deep rock mass, comprising:

• a first optical fiber, wherein the first optical fiber is deployed on a chamber wall of an underground chamber along an axial direction of the underground chamber;
• the distributed optical fiber monitoring system further comprises a second optical fiber;
• and the second optical fiber comprises a peripheral optical fiber segment and a direction-changing transition segment;
• the peripheral optical fiber segment is deployed on the chamber wall along a cross-sectional profile of the chamber wall;
• there are at least two peripheral optical fiber segments deployed at an interval along the axial direction of the underground chamber;
• and the peripheral optical fiber segments are sequentially connected end to end through the direction-changing transition segment to enable a continuous optical path for the second optical fiber;
• the first optical fiber and/or the second optical fiber are optically connected to an integrated optical fiber sensor configured to acquire a failure signal in a key monitoring area;
• and the integrated optical fiber sensor comprises a deformable body, a third optical fiber, and a vibration transmission assembly;
• the third optical fiber comprises a first optical fiber segment and a second optical fiber segment that communicate with each other;
• the first optical fiber segment is disposed on a circumferential wall of the deformable body, and is spirally wound around an axial direction of the deformable body for at least one circle to form a first optical fiber coil;
• the second optical fiber segment comprises a straight segment disposed on the circumferential wall of the deformable body along the axial direction of the deformable body;
• there are at least two straight segments uniformly distributed around a circumferential direction of the deformable body;
• and the straight segments are sequentially connected end to end through an arc-shaped direction-changing segment to form a second optical fiber coil with a continuous optical path;
• and
• the vibration transmission assembly is disposed at a bottom of the deformable body, and is configured to transmit a vibration generated by a rock mass failure to the deformable body.