Distributed optical fiber for monitoring temperature, stress and deformation of frozen wall and embedding method of distributed optical fiber

Abstract

The invention provides a distributed optical fiber for monitoring the temperature, stress and deformation of a frozen wall and an embedding method of the distributed optical fiber. The distributed optical fiber comprises at least two optical fiber sensing carriers which are stacked along a longitudinal direction; the outer side of each optical fiber sensing carrier is provided with U-shaped loop optical fibers and a temperature compensation optical cable along the length direction of the optical fiber sensing carrier; and protective steel bars are respectively arranged at the lateral directions of the U-shaped loop optical fibers and the temperature compensation optical cable. The structure and embedding process of the distributed optical fiber are simple. With the distributed optical fiber and the embedding method of the distributed optical fiber of the invention adopted, problems existing in aspects such as arrangement technique, protection structure and curing method in a frozen wall informationized monitoring process can be solved, and monitoring on the temperature, two-dimensional direction stress and deformation strangeness of the frozen wall can be accurately realized, and the survival rate of optical fiber cables can be improved.

Description

technical field [0001] The invention relates to the technical field of well-sinking by freezing method, in particular to a distributed optical fiber for monitoring the temperature, stress and deformation of a frozen wall and an embedding method thereof. Background technique [0002] The artificial freezing and sinking method is one of the most commonly used methods for constructing shafts in coal mine shafts in deep alluvium or water-rich soft rock formations. During the drilling process of the freezing method, the deformation and destruction of the frozen wall are directly related to whether the shaft excavation can be carried out normally. The stability of the frozen wall and timely adjustment of freezing parameters are key issues to ensure the safety of wellbore construction. [0003] The traditional frozen wall temperature measurement equipment currently used mainly includes copper-constantan thermocouple strings arranged in the temperature measurement hole, thermistor-...

AI Technical Summary

Problems solved by technology

However, a major problem still exists in the promotion of optical fiber sensors for information monitoring of frozen walls is the method of embedding optical fibers, which is specifically reflected in: the accurate monitoring of temperature, two-dimensional direction force, and deformation singularity of frozen walls by optical fiber sensing; How to set up the optical fiber protection device can better ensure the survival rate of the sensor; how to reduce the stress on the optical fiber during the curing process of the optical fiber, especially the shear stress

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