Abstract: The optimization of recharge parameters based on an orthogonal test and fuzzy analytical hierarchy process (FAHP)value engineering method is proposed to guarantee the functionality and economy of groundwater recharge of foundation pit. Four typical recharge parameters of the foundation pit project of the Kaiyuan Road station of the Jinan metro line R2 are selected to conduct the orthogonal test under five levels, and different recharge construction conditions are obtained. Then the numerical simulation is conducted for 30 conditions in an established finite element model, and the simulated results are processed using the FAHPvalue engineering method. The greater the magnitude of value, the higher the costperformance of the recharge scheme for the foundation pit project. Furthermore, the optimal combination of recharge parameters can be obtained by comparing the value magnitudes. The results demonstrate the following: (1) For the groundwater recharging of the foundation pit in a waterrich confined area of Jinan, China, the value reaches the maximum when the recharge depth is -10 m, the distance is 12 m, the recharge well spacing is 10 m, and the pressure is 10 kPa. (2) The recharge scheme designed utilizing the orthogonal test and FAHPvalue engineering method dramatically reduces cost with a small sacrifice on the recharge effect and considers both functionality and economy.

Key words: foundation pit project, groundwater recharge; orthogonal test, fuzzy analytical hierarchy process, value engineering method; parameter optimization