Method and system for monitoring and warning pipeline landslide depth displacement and method for constructing system

Abstract

The invention relates to a method and a system for monitoring and warning pipeline landslide depth displacement and a method for constructing the system. The monitoring is divided into three parts including landslide depth displacement monitoring, monitoring of thrust of landslide on a pipeline and pipeline strain monitoring, and comprises the steps of: inserting an inclinometer pipe (1) pasted with a fiber Bragg grating sensor into the landslide (13), penetrating all potential sliding surfaces (15), extending the inclinometer pipe to a drilling hole 3 to 5m deep under a bedrock surface, and measuring the maximum tension strain born by the inclinometer pipe (1); measuring the front thrust of the landslide (13) on the pipeline by using a packaged earth pressure cell fiber Bragg grating sensor (4) fixed on the pipeline (14); and uniformly arranging pipeline (14) monitoring sections on edges on two sides of the landslide and the pipeline (14) in the center of the landslide (13), and uniformly arranging three pipe strain fiber Bragg grating sensors (3) on each monitoring section to monitor the axial strain of the pipeline (14).

Description

technical field [0001] The invention is a monitoring and early warning method, system and construction method of the deep displacement of pipeline landslides based on optical fiber gratings. The invention relates to the technical field of stress measurement, temperature measurement and pipeline system. Background technique [0002] Landslide refers to the overall movement of the rock and soil mass forming the slope under the action of gravity along with the shearing process on the weak surface of the lower part. Landslide disaster is one of the main forms of geological disasters that cause loss of human life and property. Long-distance oil or gas pipelines have a transportation distance of thousands of kilometers, crossing many geological and geomorphic units, and often inevitably pass through areas with complex geological conditions, such as mountainous areas and permafrost areas. Due to insufficient line selection or landslides induced by pipeline construction or earthqu...

AI Technical Summary

Problems solved by technology

[0006] The traditional deep displacement monitoring of landslides mainly uses multi-point displacement meters or borehole inclinometers. This method has poor real-time performance and is difficult to meet the long-term real-time requirements of landslide monitoring.

[0007] When the coaxial cable technology is used to monitor the deep displacement of the landslide, it has advantages in cost and real-time monitoring, but the outer diameter of the coaxial cable is small (about 10mm), and it is difficult to coordinate the deformation of the cable and the soil after buying the soil, resulting in the same Shaft cable can not really reflect landslide deformation

[0008] As a new technology, distributed optical fiber technology has been applied to landslide monitoring. This technology has advantages in precision and automatic monitoring. However, when this technology monitors the deep displacement of landslides, its vertical positioning accuracy is poor (about 1m). There are also limitations in monitoring

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