The settlement of soil is one of the main reasons of underground pipeline’s damage

there are many theoretical researches to analyse this phenomenon

but their focuses are not the high fill’s settlement after construction

and most of them never consider the impact of the original terrain. This paper takes buried drainage pipe in Yanan District of loess high fill as the prototype. We designed the simulation of the soil fill settlement process

distributed pressure box

displacement gauge and strain gauge to collect soil contact pressure

pipe-soil relative displacement

pipeline strain and so on. The experimental study shows that the negative soil arch effect has obvious influence on the pressure of the upper part of the pipeline. The vertical pressure coefficient is 3. 4

and the relationship between the settlement and the settlement is in line with the three degree polynomial curve

and the effect of the negative soil arch effect on the pipeline can not be ignored. Void layer between the bottom of the pipe was found in longitudinal profile. The phenomenon can confirm the decrease of the pipe soil contact pressure. The research results can provide reference for the calculation of the soil pressure around the pipeline and control of pipeline deformation in loess high fill.