The invention discloses a method of determining thermophysical parameters of rock soil and
heat resistance of a vertical
ground heat exchanger. The method includes steps: initializing
test data and parameters of a
drill hole and a buried
pipe acquired in a thermal response experiment; initially setting rock soil
heat conducting coefficient
lambda s, rock
soil volume heat capacity Cs and
weight coefficient f corresponding to weight average temperature, and setting respective parameter ranges; using a column heat
source model and a quasi-three-dimensional
heat resistance model to calculate drillhole wall temperature Tb, I,
ground heat exchanger inlet-outlet
fluid temperature Tin, sim, i, Tout, sim, I and
ground heat exchanger heat resistance Rb, I corresponding to each moment in the experiment; using square sum mean value of measured value and
simulation value difference of the weight average temperature as a target function fopt, and using a
simulated annealing algorithm to perform optimization iteration on
lambda s, Cs and f; when fopt is lower than an optimization target value
delta Tset, acquiring optimization results of three parameters
lambda s, Cs and f, calculating a mean value of the sum of Rb, I at each moment corresponding to the optimization results, and acquiring heat resistance Rb of the ground
heat exchanger. By the method, accuracy of recognition results on the thermophysical parameters of the rock soil and the heat resistance of the ground
heat exchanger is improved.