Modified Cam-clay model of structured loess

The strength and deformation characteristics of natural geotechnical materials are connected with the structure of soils. Based on the theoretical frame of comprehensive structure potential, a structural parameter is introduced into the modified Cam-clay model, and the mechanical characteristics of structured soils are forecast. Firstly, the relation between compression and structure is analyzed, in other words, it is established that preconsolidation pressure, compressive index and rebound index are related to the structural parameter. Secondly, the strength features of the structured soils are analyzed, then the critical condition line varying with structural parameter is put forward. Finally, by introducing the structural parameter into the modified Cam-clay model, a structural model according to the strength and deformation characteristics of natural geotechnical materials is developed. After preliminary validation, the proposed model can accurately indicate the strength and deformation laws of structured soils.