2. A vertical hydraulic fracture was initiated in a borehole at a depth of 3000 ft. Assume the ground is saturated continuously from the surface and that the pressure in the ground water is hydrostatic. The water pressure was first raised 710 psi above the original groundwater pressure and then it was not possible to raise it further. When pumping stopped, the water pressure fell to a value 110 psi above the original groundwater pressure. After a day, the pressure was raised again, but it could not be pumped to a value higher than 100 psi above the previous pressure (the "shut-in" pressure). Estimate the horizontal stresses at the site of measurement, the tensile strength of the rock, and the vertical pressure at the site.

2. A vertical hydraulic fracture was initiated in a borehole at a depth of 3000 ft. Assume the ground is saturated continuously from the surface and that the pressure in the ground water is hydrostatic. The water pressure was first raised 710 psi above the original groundwater pressure and then it was not possible to raise it further. When pumping stopped, the water pressure fell to a value 110 psi above the original groundwater pressure. After a day, the pressure was raised again, but it could not be pumped to a value higher than 100 psi above the previous pressure (the "shut-in" pressure). Estimate the horizontal stresses at the site of measurement, the tensile strength of the rock, and the vertical pressure at the site.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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