Comparison of CHI test data interpretation method in Xinchang block

By taking the CHI (Constant Head Injection) tests performed in three boreholes of Xinchang block in the candidate Beishan area for geological disposal of high level radioactive waste as an example, the steady formula method and transient curve matching method were compared in 3 aspects: interpretation of the injection period, interpretation of the recovery period and interpretation of special tests. It was found that the transient curve matching method is suitable for more flow models and can manipulate more data and conductivity obtained from the recovery period is more reliable than the injection period. According to the optimizing rule, conductivity probability distribution of three borehole (BS17 ∼ BS19) were obtained, Xinchang block is of low-permeability and suitable for the disposal of HLW. (authors)