For simple cantilever shoring, the pressure can be calculated by the following formula:
max pressure = 0.8 * (1-sin(soil friction angle))/(1+sin(soil friction angle)) * soil density * height
I'm going to use 60 degrees as the soil friction angle - mostly because of the clay sand and the 'weak' sandstone seam. Only the top foot or so is really sand. Assuming a very conservative soil density of 2kg per litre, the pressure would be around 200kg per square metre. The wooden posts are certainly strong enough for that and the ply wood should be able to handle that burst pressure.
max pressure = 0.8 * (1-sin(soil friction angle))/(1+sin(soil friction angle)) * soil density * height
I'm going to use 60 degrees as the soil friction angle - mostly because of the clay sand and the 'weak' sandstone seam. Only the top foot or so is really sand. Assuming a very conservative soil density of 2kg per litre, the pressure would be around 200kg per square metre. The wooden posts are certainly strong enough for that and the ply wood should be able to handle that burst pressure.
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