The Installation Method of Strain Gage Used to Monitor Pipeline Strain in Landslide-prone Areas

It is an effective method to safeguard the safety of pipeline to monitor the stresses and strains of buried pipelines in the areas where landslides take place frequently, The strain gage, consisted of resistance type strain gage, vibrating wire strain gage and fiber grating gage with a variety of features and applicable conditions in each of them, can be used to monitor the stresses and strains of pipelines, According to the monitoring purposes and requirements, the measuring points allocation, installation location and direction of each point can be determined based on applied mechanics theory, for example, only one strain gage will be enough to make certain if the landslides have an impact on pipelines; if the bending and deformation of pipeline is only considered, two strain gages are needed to be installed in the direction of 90°angle; to explain adequately longitudinal strains in the cross section of pipeline, three strain gages are at least needed: if more accurate strain and deformation values of pipeline are wanted, four strain gages will be installed in order to obtain four individual monitoring data, Taking some domestic gas pipeline as an example, and combined with finite element analysis with ANSYS, the monitoring scheme of applicable strain gage is determined on the basis of the structure, operation conditions, forced pattern and field conditions of this pipeline, and monitoring results are given.