Modeling Response of Clays to Varying Loading Rates

 

Dr. Dinesh R. Katti

 

Applications of this research effort:

                                               Blast Loading

 

Earthquakes

 

 

 

Research Objective:  To Develop Mathematical Models (Also Called as Constitutive Models) to Predict the Stress-Deformation And Porewater Pressure Response of Clays to Varying Loading (Stress or Strain) Rates

 

 

Results:

 

The undrained stress-deformation behavior of clays is significantly affected by the loading rate. Based on the observed experimental response, it is possible to model the strain rate response of clays as an apparent overconsolidated clay response. In this work, we have quantitatively determined the change in overconsolidation ratio (OCR) due to change in strain rate. Our results show that the shear strength response and the excess pore water pressure response at the peak stress provide quantitatively similar magnitudes of change in OCR with increasing strain rate. This finding holds true for both normally and overconsolidated clays. This suggests that the relationship between strain rate and change in OCR can be considered as an inherent material characteristic and is quantifiable. A relationship between the change in OCR and change in strain rate is described.

 

 


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Katti, D.R., Tang, J. and Yazdani, S., (2003), The Undrained Response of Clays to Varying Strain Rates , ASCE J. of Geotechnical and Geoenviro. Engg., v129, n3, pp 278-282.

 

 

Graduate Student:

 

 

Jingpeng Tang (Ph.D.) (Graduated)