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<br />O"^?1.;0 <br />U .:l.. ~_' ,. " <br /> <br />{i~ <br /> <br />{~~~) <br /> <br />The tests were performed on Nx cores drilled from two blocks of Navajo <br />sandstone and three blocks of Kayenta sandstone., They inelude determina- <br />ti ons of: <br /> <br />Specific Gravity <br />Wet and dry ultimate strengths <br />Modulus of elasticity and Poisson's ratio <br />Pereent absorption and porosity <br />Direet shear and triaxial test <br />Sliding frietion test (angle of friction and cohesion) <br />Thermal properties <br />Photographs were taken of all test samples before and after testing. <br />7. Geologic Sections <br />These 14 geologic sections are designed to document all significant <br />pertinent geologic detail including rock structure, stratigraphic <br />variations, sedimentation, rock staining, and rock composition. <br /> <br />These reeords provi de ,a base upon whi ch future compari sons of the roek <br />condition in the canyon ~Ialls can be made. Range 8, at the bridge axis, <br />shows the location of 23 metal points intended to monitor any erosion <br />of the canyon surface if it occurs. <br /> <br />o <br /> <br />An important element of these sections is that they record eXisting <br /> <br />potentially unstable areas in the canyon walls. From this information <br /> <br />it is possible to anticipate where future failures in the canyon~lal1 <br /> <br />may occur. <br /> <br />5 <br /> <br />'r <br /> <br />