Prior to the beginning of the test a maximum test pressure (PMAX) is defined. PMAX is
chosen such that it does not exceed the confinement stress (σ3) expected at the depth
where the test is being conducted, thus avoiding the development of hydraulic fracturing
or hydraulic jacking. As a rule of thumb, PMAX is usually established using Equation 1,
where D is equal to the minimum ground coverage – depth in the case of a vertical boring
in a flat site or minimum lateral coverage in the case of a test conducted in a hillside