5107 SOUND AVE 2017-01-14 - Laserfiche WebLink

July 21, 2� 14 Two Single-F'amily residences L&A 7ob No. 14-065 Page 15 the angle above horizon in degrees of the hillside behind the wa1L The active soil pressure may be countered by a passive soil pressure of 400 pcf EPD over pile toe embedment in hard clayey silt deposit. The above soil pressures are unfactored ultimate values. The active soil pressure should apply on one pile s�acing over the unsupported wall height and one pile diameter below. The passive soil pressure should apply on the lesser of one pile spacing or two pile diameters for soldier pile toe embedment. T`he soldier pile wall should be designed for a factor of safety of at least 1.5 against sliding and overtlu�nang failures under static loading. . .. . . , y _ i1.�J i; :� (a . � . . . „ , , tl '' r�;:i �.,.i ��{� ��.�-� �r.�.�;� ns�,r97$ �' '�ii� 51�li1i�1 �9`ii; b�l�ff.i S13Ci7.�1� ' � r� �;,�v- , i _ recommend a pseudo static loading be used for seismic loading design of the wall. The active soil pressure should be an invert triangular distribution pressure diagram, with the ma�mitude of pressure at the top to be l OH[(30H+0.75 �3)/30H] EFD, where (3 is the angle above harizon in degrees of the hillside bebind the wall, and H tlie unsupported height of the wall. The allowable stress of the soldier pile wall elements may be increased by one third for design of short-duration seismic loading. The soldier pile wall should be designed for a factor of safety of at least i.i5 against sliding failure and L2 against overturning failure under seismic loading. The soldier piles should be lagged v�rith timber boards from the top of the wall io at least one foot bel�w finish grade in front of the vaall. The iimber laggir�g boards should be of treated wood suitable for outdoor and soil contact use. Timber lagging boards may be designed for o�e half the above recommended active soil pressures for static and seismic loadings to account for soil arching effect between the soldier piles. LIU 8� ASSOCIATES, INC.