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<br />9. The injection sequence should proceed from toe of slope to top of slope, but the mat <br />should be anchored at the top of slope first by pumping grout into the first rows of bags, <br />by allaching the mat to a structure, or using tension anchors (see recommended <br />injection sequence in Figures 5.2 and Figure 5.3). <br /> <br />10. If the mat is to be permanently anchored to a pier or abutment there are implications <br />which must be considered when using this technique. The transfer of moments from the <br />mat to the pier may affect the structural stability of the bridge. When the mat is attached <br />to the pier the increased loadings on the pier must be investigated. <br /> <br />11. Curved edge designs may require communication with the fabric manufacturer on <br />shaping limitations and field adjustments. <br /> <br />12. The need for a geotextile or granular filter should be addressed. Guidelines on the <br />selection, design, and specifications of filter material can be found in Brown and Clyde <br />(HEC-11) (1989) and Holtz et al. (FHWA HI-95-038) (1995). <br /> <br />Figure 5.2 illustrates some of the installation features specified by ODOT on the Salmon <br />Creek Bridge as well as typical design features. Notice that the original ODOT design was <br />modified by the manufacturer due to the limitations of the product. The fabric forms could <br />not be terminated in a smooth fan shaped pallern as shown in the original ODOT design. <br />Therefore, the mat was cut at the seams to best fit the original design. It was anticipated <br />that this would make the system somewhat less effective than the original design because of <br />a greater susceptibility to undermining of the edges. Figures 5.4 and 5.5 show the final <br />installation of the articulating block mat at Salmon Creek Bridge. <br /> <br /> <br />Figure 5.3 Installation of articulating block mat proceeding upslope (OOOT) <br /> <br />5.7 <br />