Based on the unique feature of the combined soil-rock geological conditions in Qingdao

Shandong province

the deformation and dynamic responses of the end-suspended piles for foundation pits in the combined soil-rock foundation pits under gantry crane moving loads are studied by using the finite element code

Plaxis

and field monitoring. The results indicate that the numerical predictions agree well with the measured deformations of the pre-bored pile shaft

and the major deformation of foundation pit occurs in the soft soil strata in rocky area

whereas the stress concentration occurs at the rock-socketed part of the end-suspended piles. In addition

under the gantry crane moving loads

the horizontal displacement of the pile head is larger

and its dynamic response is the least pronounced

whereas the horizontal displacement of the rock-socketed part is smaller and its dynamic response is the most significant. At the rock-socketed part

maximum positive bending moment part and maximum hogging moment part

the dynamic responses of earth pressure are the most pronounced

and the largest response occurs as a moving load passes by. The results can provide reference for the deep foundation pit supporting design in similar geological conditions.