Effect of dumping protocol and consolidation on shear strength of highly saturated abandoned-clay
In this paper,24 sets of large-scale combined tests of consolidation and direct shear were conducted on the representative abandoned-soil samples that obtained from a foundation engineering site in Hangzhou.They were performed to investigate the shear strength behavior of highly saturated clay during consolidation under three loading protocols of instantaneous,stepped and linear stress.The results show that:the highly saturated clay had immediate compression after the application of overburden stress and the compression increased with an increase in the stress;when the final stresses of three loading protocols were the same,the final settlement was relatively close;the shear curves were strain hardening,and the initial tangent modulus and final shear stress both increased with the increase of consolidation degree or overburden stress;the loading protocol had a certain effect on the initial tangent modulus,but had a smaller effect on the final shear stress;the shear strength increased linearly with the growth of consolidation degree,and the magnitude of increase was significant with increasing stress;when the overburden stress and consolidation degree were consistent,the shear strength was essentially similar under three loading protocols.Based on the above findings,a shear strength prediction model of highly saturated clay considering consolidation was established and its reliability was verified using the data from this study and relevant literature.The model analysis results show that:with the growth of consolidation degree,the shear strength envelope intercept increased linearly,while the bending degree decreased linearly.In the highly saturated abandoned-clay dumping projects,the model established in this paper can be used to predict the shear strength of the soil under consolidation process of different dumping protocols.
万方数据
维普
