Analysis of the Pile-Soil Combined Effect of Micropiles in Strengthening Expansive Soil Landslide in Southern Shaanxi Based on the Dynamic Soil Arch Model

Southern Shaanxi region is mountainous and landslide disasters are frequent. Micropile reinforcement technology widely used in management, especially emergency rescue projects, due to easy construction, small soil disturbance, strong site adaptability. Soil arch effect an important prerequisite for safe economic performance of the support function micropile. For swelling accumulation layer southern Shaanxi, firstly, a numerical model established by means thermal-mechanical coupling FLAC3D explore variation form with different forces. Then, two theoretical models proposed under normal working condition rainfall condition. The evolution failure mode analyzed. results show that expansion after causes change mode, range pile-soil interaction obviously reduced, weakened. It should be considered design micropiles strengthening expansive landslide.