Study on the settlement control of pile group foundation by using pile shaft grouting

Taking Yangcheng Lake segment of Danyang-Kunshan super large bridge of Beijing-Shanghai high-speed railway as the engineering background, we carried out field tests to study the control effect of the corner pile shaft grouting and side pile shaft grouting on the settlement volume of pile group foundation under normal service in thick soft clay. We also used the numerical simulation method to analyze the impact of the variations of two parameters, which were the parameter of the interface between pile and soil and the deformation modulus of the soil around pile in pile-soil system, caused by pile shaft grouting on the settlement of pile group foundation under design load. It can be concluded from the research that the side pile shaft grouting can increase the parameter of the interface between pile and soil, and the deformation modulus of soil around pile, thus has an evident effect on the control of the settlement volume of pile group foundation under normal service in the thick soft clay. The control effect of side pile shaft grouting is more obvious than corner pile shaft grouting. When carrying out pile shaft grouting, the spread range of the grout in the soil will directly affect the settlement of pile group foundation.