Abstract:

The authors propose a method to determine synthetically geotechnical thermal physical parameters according to laboratory experiments for a certain project in Shanghai. Based on discrepancy of testing results between laboratory and field test，formation thickness，water ratio，density and osmotic coefficient are chosen as primary factors that affect difference of thermal physical parameters between laboratory testing and field testing. And the weighted values of every factor are determined using analytic hierarchy process (AHP)，which are used to modify testing results of thermal physical parameters in laboratory. Furthermore the authors simulate field and modified laboratory thermal physical parameters simulates and practically heat transferring，respectively.It shows that the discrepancy of heat conduction capacity are 1.2%，1.1% and 2.3% for three conditions. The heat transfer capacity can be reoresented by the value of product of pipe depth multiplied by thermal conductivity. Uniform thermal conductivity computed by modified parameters of laboratory is basically equal to comprehensive thermal conductivity tested by field thermal response test，which are 1.832 W/(m·℃) and 1.778 W/(m·℃) respectively.

Key words: thermal physical parameters, testing method, analytic hierarchy process, correlation