https://howtoengineer.com/surcharge-analysis-elastic-methods-strip-load/ Engineers In Training Sat, 02 Jul 2016 01:10:05 +0000 hourly 1 https://wordpress.org/?v=4.4.14 https://howtoengineer.com/surcharge-analysis-elastic-methods-strip-load/#comment-252 Wed, 26 Mar 2014 12:16:04 +0000 https://howtoengineer.com/?p=506#comment-252 Good question. There are (sorta) of 2 answers here: First reason being, is that the Boussinesq equation is based on elasticity. It is the distribution of a vertical pressure through an elastic semi-infinite material. Therefore the typical soil parameters we are used to using to derive Ka (such as friction angle, backslope, etc) take on a different form. We are no longer using Coulomb or Rankine’s equations. Instead we must assume a value of poisson’s ratio. This value is really the only value that relates to the material. In most equations (i.e. the line load and strip load equations) it is assumed that the value is 0.5. The second part to this answer is to remember that Ka is really just a coefficient that relates vertical pressure to horizontal pressure and it is not a material property. Therefore if you were to solve the Boussinesq equation and divide your answer by your vertical pressure you would get somewhat of a pseudo-Ka value. It would not really be a Ka value to use with soil pressure but it does relate the vertical surcharge load to horizontal pressure.

]]> https://howtoengineer.com/surcharge-analysis-elastic-methods-strip-load/#comment-251 Tue, 25 Mar 2014 16:07:47 +0000 https://howtoengineer.com/?p=506#comment-251 Why the Boussinesq equation does not include Ka? It seems that the result is always the same regardless the type of soil.

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