ABSTRACT
London Clay, 19.5 m of Lambeth Clay and 3.5 m of Thanet Sands founded on Upper Chalk.
Given the transitory nature of the crane loading a short-term undrained response of the ground was considered appropriate; consequently an undrained analysis was performed using undrained soil parameters. A range of soil parameters were considered for the detailed analysis and because of the extreme nature of the problem in terms of the close proximity of the surrounding structures and uncertainties with regard to soil strength and stiffness due to construction stage effects; the final analyses assumed a single London Clay layer with very conservative values for the undrained Young’s modulus and undrained shear strength of: 30 MPa and 150 kPa respectively.
