Total-stress fiber monitoring device for thread-steel anchor rod

Abstract

The invention discloses a total-stress fiber monitoring device for a thread-steel anchor rod, so as to achieve the long-time monitoring of the total stress state of the thread-steel anchor rod on thebasis of guaranteeing the overall integrity of the thread-steel anchor rod, and accurately monitor the stress and temperature change conditions of the thread-steel anchor rod as the reliable data support for the analysis of the stress state and slope stability of a support and protection structure. The thread-steel anchor rod is fixedly provided with buckle parts at intervals in the length direction, and a distributed fiber sensor is connected with the buckle sensors, thereby forming a thread-steel anchor rod - distributed fiber sensor assembly. The distributed fiber sensor comprises a distributed fiber strain sensor and a distributed fiber temperature sensor, which are arranged at intervals in the peripheral direction of the section of the thread-steel anchor rod. The buckle parts achievethe multi-point clamping of the distributed fiber strain sensor. The thread-steel anchor rod - distributed fiber sensor assembly is buried in a slurry solidified body in a monitoring hole.

Description

technical field [0001] The invention relates to a monitoring device for slope reinforcement engineering, in particular to a full-stress optical fiber monitoring device for threaded steel anchor rods. Background technique [0002] my country has a vast territory, two-thirds of the area is mountainous, and the geographical conditions are very complicated. Landslides and other slope instability disasters occur frequently. It is one of the countries with the most serious landslide geological disasters in the world. Important infrastructure such as high-speed railways and bridges inevitably pass through high and steep slope areas prone to geological disasters, and side and landslide disasters have become important factors affecting their normal service. Taking 2010 as an example, the statistics of geological disasters by the Ministry of Land and Resources show that there were more than 30,000 geological disasters in the country in 2010, including more than 20,000 edge and landsli...

AI Technical Summary

Problems solved by technology

For the threaded steel bolt structure, there are two monitoring methods: first, the grooved adhesive is pasted in the threaded steel bolt and distributed optical fiber sensors are installed to monitor the mechanical state of the bolt. The problem of continuity and damage to the anchor rod; second, a pressure sensor is installed at the anchor head position of the free section of the end face of the rebar anchor rod to measure the stress at the end, which cannot realize the full stress monitoring of the rebar anchor rod

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