@@rukhayatorekoya2266 To get the compression index (Cc), that is correct. Project a tangent line from the approximately linear portion of the compression (loading) curve.
Might be better to plot change of strain vs log(signma') or even log strain vs log(sigma'). The first gives Cc/(1+eo) directly. The second gives two "straight lines' to give preconsolidation pressure (better estimation)
Thanks for your comment. This video is aimed at folks at the first-semester soil mechanics level, which cover this particular topic. I have a few other videos that cover other relationships, including what you mention. See links below: ua-cam.com/video/1LGJJrJA52o/v-deo.html ua-cam.com/video/K4Itl4T540g/v-deo.html
@@mathandengineeringwithdr.a9515 - perhaps an interesting story - probably for the pre-consolidation pressure determination - but my mentor studied under Terzaghi and Casagrande at Harvard (my mentor is 92 and still consulting) - anyway Casagrande came up to the Company's office in Toronto as he was consulting on one of our projects - anyway a young chap had done all the preconsolidation constructions on a number of samples and proudly showed them to Casagrande who looked at them and said - "well, this should be about here; and that one there" - but, the lad replied, I did them as per your procedure . . Casagrande looked at him and said - well, I had to develop something so the students would get in the right ball-park! Cheers
Thnaks alot for this video. To be clear, did you draw the tangent line from the sharp end?
@@rukhayatorekoya2266 To get the compression index (Cc), that is correct. Project a tangent line from the approximately linear portion of the compression (loading) curve.
@@mathandengineeringwithdr.a9515 thank you
Thank you Dr!
Might be better to plot change of strain vs log(signma') or even log strain vs log(sigma'). The first gives Cc/(1+eo) directly. The second gives two "straight lines' to give preconsolidation pressure (better estimation)
Thanks for your comment. This video is aimed at folks at the first-semester soil mechanics level, which cover this particular topic. I have a few other videos that cover other relationships, including what you mention. See links below:
ua-cam.com/video/1LGJJrJA52o/v-deo.html
ua-cam.com/video/K4Itl4T540g/v-deo.html
@@mathandengineeringwithdr.a9515 - perhaps an interesting story - probably for the pre-consolidation pressure determination - but my mentor studied under Terzaghi and Casagrande at Harvard (my mentor is 92 and still consulting) - anyway Casagrande came up to the Company's office in Toronto as he was consulting on one of our projects - anyway a young chap had done all the preconsolidation constructions on a number of samples and proudly showed them to Casagrande who looked at them and said - "well, this should be about here; and that one there" - but, the lad replied, I did them as per your procedure . . Casagrande looked at him and said - well, I had to develop something so the students would get in the right ball-park! Cheers