Laserfiche WebLink
<br />Lower part of rlprap separates from upper part, and moves <br />downslope as homogeneous body. The toe may not show <br />a bulge if channel bed Is scoured. Translational slide <br />usually occurs If side slope is too steep or toe of rlprap <br />Is undermined. <br /> <br />BULGE <br /> <br /> <br />ROCK RIPRAP <br /> <br />CHANNEL BED <br /> <br />TRANSLA TIONAL SLIOE <br /> <br />Riprap moves downslope along a fallure plane <br />that lies at or above base material. Failure <br />plane Is at a flatter slope than original rlprap <br />layer. This type of fsllure Is usually caused <br />by excess hydrostatic pressure In rlprap <br />layer or shear along filter blanket. <br /> <br /> <br />Failure plane <br /> <br />Filter blanket at <br />surface of base <br />material (not shown) <br /> <br />CHANNEL BED <br /> <br />MODIFIED SLUMP <br /> <br />Rlprap moves downslope along a fallure plane <br />that lies In base material. Failure zone Is <br />dlsh-shsped. This type of failure Is usually <br />caused by excess hydrostatic pressure <br />in base material. <br /> <br /> <br />SCARP <br /> <br />HANNEL BED <br /> <br />SLUMP <br /> <br />FIGURE 4. Classification of principal types of riprap failures (Continued). <br /> <br />11 <br />