7015 YEW ST 2016-01-01 MF Import

PROJECT NUMBER 2184 17 May 1997 page 3 of 4 pages Although slides often occur at the sand/clay intersection resulting from heavy groundwater seepage, there was no evidence of heavy groundwater seepage at the time of the investigation, and there was no evidence that sliding had occurred lower on the slope. The major portion of the failure occurred within the existing wall after the combination snow melUrainfall that exceeded any conditions in recorded history. RECOMMENDATIONS HEMPHILL conducted design calculations for a Keystone tieback retaining wall, which is the owner's preference to replace the existing retaining wall. The parameters used for the design process are shown in Figure 3 on the opposite page. The geegrid used in the design to tie back the Keystone blocks is Huesker 35/20 in accordance with the desire of the contractor. Figure 4 below shows the results of the calculations for a 16 foot high wall. FIGURE 4 DESIGN CALCULATIONS fo� KEYSTONE WALL CEOTE%iILE RETAINING W�IL D�SiGN for JOEL RELETNFORD LOC�TED ac REAR of YARD TRIAI NUMBER 4 DaTE of TRIAL O4•18-199b """""""" ...... .... . ....... ... . ... ........ """"'.......... _. _. _ _... "' .... """""""""•"""' •'. """""" NEIGMT INCREMENTAI REOUIRED FABRIC LENGTM MININUM TOT�L DOES FA6RIC MOMENT ACTIKG RCtIVE TOTAL of PULL FABRIC FRICTIONAL FABRIC for �ESIGN LENGTH STRENGTN of E�UIV FIUID FAILURE SURCHRF YRLL FORCE RESISTANCE RESISTANCE PULL OU7 LENGTH FABRIC EX[EED PULL OVERTURN PRESSURE PLIINE LOAD: (fti (lbs) (lbs) (psf) (fU (fU (ft) PLUS SF (ft lbs) (pcf) (deg) (lbs: """" """• "' ..... .......... ."""' .....' """ "'...."" .._.."' "'_""' """ """' O.J 0 0 0 0.0 0.0 0.0 0 0 0 0 2.0 37 55 2G0 0.2 5.2 15.8 YES 24 18 50 0 4.0 110 165 480 0.3 53 14,4 YES 186 18 50 � 6.0 183 275 720 0.4 5.4 72.9 YES 638 18 50 0 8.0 25fi 385 960 0.4 5.6 11.4 YES 1,530 18 50 � '..,.0 330 495 1,200 0.4 5.4 9.9 YES 3,008 1B 50 � 12.0 403 604 1,440 0.4 5.4 B.G YES 5,219 18 50 � 14.0 676 774 1,680 0.4 S.G 6.9 YES 8,349 18 50 � 16.0 550 824 1,920 0.4 5.� 5.4 YES 72,624 18 50 0 �r�'��r�?�,,.�r�