Field tests on vertical bearing capacity of pipe piles in cement-improved soil

In order to study the load transfer of the pipe piles in cement-improved soil under vertical loads, the axial load tests are conducted to analyze the distribution characteristics of axial force, side friction and compression along the pile body. The results show that the load-settlement curves of the pipe piles in cement-improved soil change slowly and gradually. The axial force of the piles decreases linearly along the pile depth. The vertical loads at the bottom of the piles range from 15% to 20% of the vertical loads, and the side friction of the piles in cement-improved soil bears 80% ~ 85% of the vertical loads. The side friction of the piles in cement-improved soil is 6~9 times that of the piles in natural surrounding soil. The ratio of the pile compression to the total settlement is 20%~30%. The research results may provide technical support for the vertical bearing design practice of the piles in cement-improved soil.