In order to analyze the ground temperature response and thermal effect radius of the heat transfer of the deep buried pipe

a full-scale numerical model of buried pipe heat transfer is established based on the well logging temperature

ground lithology interpretation

and field heat transfer experiments of an actual deep-buried pipe heating project in Xi’an. By the numerical analysis of the heat transfer of the buried pipes in five years

namely five heating periods and four recovery periods

the variation of ground temperature fluctuation （Δ

T

） around the buried pipe at different depths with running time is summarized. On this basis

by considering the theoretical research and engineering application

three different Δ

T

limits are selected to determi

ne the thermal effect radius

and the factors affecting the thermal effect radius are analyzed. The results show that when Δ

T

limit is small enough to close to zero

the thermal effect radius is mainly affected by the geotechnical parameters around the buried pipe

and when Δ

T

limit increases

the thermal effect radius is mainly affected by Δ

T

limit.