Abstract: Due to the thick cylinder can give fully play to the compressive characteristic of materials, it is widely used in foundation pit engineering. The traditional design and calculation method is Lame solution of the thick cylinder which is mainly under the uniform pressure. In order to solve the eccentric load problem in practical engineering, an analytical solution of the thick cylinder under eccentric load is given. Combining with the engineering practice, the stress state of the cylinder supporting structure is simplified; the analytical solution is applied to calculating tensile stress of the thick cylinder supporting structure under eccentric load. Especially the effects of the uneven variety of groundwater level, ground uneven loading and the unbalanced excavation of the soil layer on the supporting structure are all discussed. The effects may cause large hoop tensile stress and vertical cracks on both internal and external surfaces of the cylinder. It has an important guiding role for cylinder section reinforcement design and excavation construction control.

Key words: thick cylinder, supporting structure in foundation pit, eccentric load, tensile stress, analytical solution