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How can I plot such a graph with Excel or Matlab by a uniform load q, and how can I see where the stress becomes 0.1q?

The loaded area and the equation is on the picture shown below, equation is highlighted in yellow

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    $\begingroup$ The plotting in Matlab can certainly be done with a contour plot once you include the equations in your question. $\endgroup$ – Chris Mueller Apr 1 '15 at 21:57
  • $\begingroup$ @MuradNazari This is similar to some instantly recognizable geotech charts that can be found in any textbook. The two methods I am aware of to create these charts use either the Bousinesq equations (example) or the Westergaard equations (example). However, your chart does not match either of those charts. I need to know what method it is using. $\endgroup$ – Rick supports Monica Apr 2 '15 at 21:18
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    $\begingroup$ @GlenH7 Ah ha! I found what method is being used here: it's Bousinesq for the stress increase under a flexible strip loaded footing (the method can be found in Das, Principles of Geotechnical Engineering). Since it is now obvious what method is being used I think you can reopen the question. Probably needs to be edited though. I can do that but not today. $\endgroup$ – Rick supports Monica Apr 2 '15 at 21:28
  • $\begingroup$ @GlenH7 Thanks for mentioning Boussinesq (is it one or two s?). I use it very often in the context of contact pressures and deflections. $\endgroup$ – John Alexiou Apr 7 '15 at 21:06
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You can use this formula to calculate it based on the x, horizontal distance and z vertical distance. Simply put z=0 and increment it say by 0.1 in excel while x starts from B/2. enter image description here

Formula enter image description here

sample calculations enter image description here

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