Study on Interaction Mechanism of Natural Gas Pipe-Landslide System Reinforced by Micropile Groups Based on Model Test

Natural gas pipeline projects in mountainous areas are inevitably affected by geological disasters such as landslides, which pose a serious threat to the safe operation of pipelines along routes crossing landslide areas. In this paper, based on pipe-landslide project area southwest China, interaction mechanism and failure evolution process landslide-pipeline system reinforced two kinds micropiles studied through indoor large-scale physical model tests, some suggestions support work put forward according test results. It was found that deformation engineering composed landslide, micropile, presents high degree synergy under external force mainly experiences four stages: initial period, uniform accelerated residual period. The bending perforated pipe micropile is large at 1/4 position pile top from bottom, screw near sliding surface serious. welding port weak pipeline; after pile, interface first cracked, ends tear, finally completely broken. cannot effectively resist thrust load level, so risk damage greater. yield strength ultimate greater than those can still exert certain resistance reaching bearing capacity, has beneficial effect reinforcement system. research results provide important reference value for treatment engineering.