No abstract

Earth dams exhibit complex behaviors under various loads and the daily increasing development of the earth dams has made researchers more accurately investigate the soil's mechanical properties including the stress-strain relations and related stress paths. The present study takes advantage of a Multi-Laminate theory to achieve a model that is capable of predicting crack propagation in earth dams on every arbitrary path. The numerical analysis is conducted herein using the finite element method through taking 17 micro scale planes into account. It is by the use of a Multi-Line pattern within the format Multi-Laminate theory for a point in drainage mode that the materials' behaviors have been predicted with a maximum error rate of 13%. It was made clear in this mode that the failure is highly likely to occur on planes 14, 15, 16 and 17 followed by planes 1, 2, 3, 4, 5, 6, 7 and 8that are deemed active, respectively. In normal stress states of the strain, planes 9, 10, 11, 12 and 13 were also found active besides the abovementioned planes.

Dam construction is one of the major development planning policies. The observation of the criteria and standards codified in every country for the achievement of a safe plan is also a major principle. A progressive failure is highly likely if fracture occurs in each section of an earth dam due to dynamic loads. Since such an inspection needs precise modeling and defining of the proper boundary conditions in high accuracy, multiline models have been taken into account herein through taking advantage of multiline pattern. Pattern parameters have been applied in the present study for confining pressures by comparing behavioral pattern with the results of standard triaxial experiment for three different confining pressure rates. Next, for dynamic (cyclic) state, the results obtained from the behavioral pattern will be compared with the results of the standard triaxial laboratory results. To observe the accuracy of the behavioral pattern's performance for cyclic loading mode, use was made of the results of a cyclic triaxial experiment conducted by Anlong Lia et al. for confining 2MPa, 10MPa, 20MPa, 30MPa, 40MPa and 50MPa pressures. After adding the new model to OpenSees numerical analysis, it is necessary to reensure the accuracy of the multilinear behavioral model's performance within the format of the multilaminate theory. Thus, to do so, a standard cyclic triaxial experiment was conducted with the same dimensions and the same boundary conditions and with strain in a confining pressure of 10KPa for the dynamic loading state following which the stress-strain and volumetric strainaxial strain curves were drawn for them and the behaviors were obtained for the new model in the finite element space and the laboratory results were eventually compared.