Study on Strength of Unsaturated Soil Considering Cyclic Hysteretic of Water Content
[Purposes]The influence of matric suction and water content on the shear strength of unsatu-rated soil was discussed,and its variation rule was summarized.[Methods]Based on the Bishop unsatu-rated soil strength model and the capillary hysteretic variable model,an unsaturated soil strength model is developed,which considers the influence of cyclic hysteretic change of water content.Through the verification and analysis of the selected test data,it is found that the model is in good agreement with the actual situation.[Findings]With the increase of matric suction,the shear strength of unsaturated soil will increase.However,when the matric suction reaches the maximum value,that is,when the water con-tent is very low,the strength of the soil decreases.In addition,the shear strength of soil increases with the decrease of water content.However,when the moisture content of unsaturated soil reaches a certain threshold,the shear strength of soil decreases to a certain extent.[Conclusions]The above results are only numerical results,and their authenticity needs to be verified through physical tests in order to better determine the applicability of the model.
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