Abstract: Based on the vertical static load tests and pile body mechanics tests on three deep rock-socketed ferroconcrete pouring piles, the load transfer behaviors and bearing characteristics of the piles implanted into weathered mudstone layer in the Jiaozhou Bay reclamation area are analyzed. The test results show that under the vertical load, the axial force of piles decreases gradually with the increasing depth, the side friction of piles comes into play gradually from top to bottom, and the side friction of fully weathered mudstone layer is the largest as it accounts for about 60% of the pile top load. Under the maximum load, the tip resistance of the three test piles accounts for 7.9%～9.3% of the total load, and three piles show properties of friction piles. This study is useful for the design and construction of weathered mudstone foundation deep rock-socketed piles in similar areas.