Pile foundation settlement analysis method for complex geology

The invention relates to the technical field of pile foundation settlement analysis, in particular to a pile foundation settlement analysis method for complex geology, which comprises the following steps of: firstly, setting the thickness of a compression layer of a lower pile bottom of a core tube and the thickness of a compression layer of a lower pile bottom of an outer frame column as two variables, and calculating and analyzing to obtain a compression layer thickness interval meeting a standard settlement limit value requirement; and the thickness of a pile bottom compression layer is controlled to be within the interval by adjusting the pile length. The scheme is mainly applied to pile foundation design and construction of a frame core tube high-rise building, the precondition is an existing pile foundation design scheme, and a pile bottom compression layer thickness combination table meeting the requirements of specifications for settlement is given firstly. After two points are supplemented and survey