Assessing the Long-Term Performance of Mechanically Stabilized Earth Walls (2012) / Chapter Skim
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10 At perhaps its most basic level, effective asset management consists of three components: (1) data collection; (2)
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11 FIGURE 1 Element condition narrative guidance (DeMarco et al.
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12 developing. The inspecting engineer describes the overall wall performance as ‘low,' providing appropriate narrative describing the state of global distress, and rates the wall performance at a ‘4' per the rating definitions.
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13 • Joint spacing • Condition of "v-ditch" (i.e., drainage way at top of wall) • Coping deterioration • Drainage runoff • Drainage at the front of the wall.
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14 Wall panels shall be checked for cracking, spalling, other forms of deterioration, and collision damage. • Drainage systems through or along MSE walls should be inspected to verify water is free flowing into and out of the appropriate facility.
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15 Other examples of using new technologies to monitor the performance of MSE walls include the incorporation of fiber-optics into geosynthetic reinforcement (Lostumbo and Artieres 2011)
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16 conducted "in the absence of any special condition or circumstance that makes it prudent to inspect more often")
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17 thickness loss, as well as decreases in tensile strength. With electrochemical methods, potential and polarization resistance measurements are made and correlated with dimensions of the reinforcement.
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18 State Description California Has been installing inspection elements with new construction since 1987, and has been perform ing tensile strength tests on extracted elements. Some electrochemical testing of in-service reinforcements and coupons has also been performed.
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19 year intervals for a minimum of four retrievals, or one-third the expected life of the facility. The state of practice for assessing degradation and corrosion in MSE walls, as indicated by 14 survey participants who provided specific responses, is shown in Table 13.
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