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Home My WebLink AboutR-391512GENERALNOTES A. Rockery construction shall be performed in accordance with the Associated Rockery Contractor Guidelines. B. Rockery construction is a craft. The skill and experience of the builder will largely dictate the success of the construction. C. A rockery is a protective system with respect to weathering and erosion processes on an exposed soil face. D. Maximum inclination of the slopes above and in front of rockeries should be 2H : 1V (Horizontal: Vertical). E. Minimum thickness of filter drain rock shall be 12 to 18 inches as specified. F. Rockeries should be installed under periodic or full-time observation by the Geotechnical Engineer as appropriate. G. The long dimension of the rocks should extend back towards the cut or fill face to provide maximum stability. H. Rocks should be placed to avoid continuous joint planes in vertical or lateral directions. Each rock should bear on two or more rocks below it, with good fiat -to -fiat contact. I. For FIII Rockeries, it is imperative that Structural Fill compaction extend all the way to the back of the Rockery and Filter Drain Rock Zone. Reduced lift thickness and light compaction equipment may be required to fully achieve the required compaction. J. Reference: Encompass Engineering & Surveying, Grading and Drainage Control Plan, sheet 5 of 10, Dated November 18, 2016 K. The following design assumptions were used: e Internal angle of friction for reinforced soil = 32 degrees ° Unit weight of reinforced soil = 125 pot ° Maximum rockery height = 8 feet ° Batter of rockery = 1 H : 6V o Surcharges = 250 psf Uniform Slope Surcharge (where applicable) 2500 lb. Footing Strip Load Size Approximate Weight (lbs.) Approximate Diameter (in.) 1 Man 5 - 12-18 2 Man 200-700 18-28 Man 700 - 200 - 36 n 2000-4000 36-48 Man 4000 - 6000 48 -54 6 Man 6000 - 8000 54 - 60 NATIVE CUT ROCKERY A. The Geotechnical Engineer shall observe cuts for the rockery. Additional fattening of cuts may be recommended by the Geotechnical Engineer depending on the soil and groundwater conditions observed. Where Native Cuts do not expose competent Native Soils, additional excavation, as well as addition of reinforcement and Compacted Structural Fill, may be necessary. FIELD QUALITY CONTROL A. The rockery construction shall be observed by the Geotechncial Engineer on a Periodic or full-time basis as appropriate. Testing of the compacted backfill shall be performed by the Geotechnical Engineer. B. Quality assurance shall include foundation soil inspection, soil and backfill testing, verification of design parameters, and observation of construction for general compliance with design drawings and specifications. GEOGRID SOIL REINFORCEMENT A. Structural geognd reinforcement shall consist of Miragrid 5XT, or an alternative as approved by the Geotechnical Engineer. STRUCTURAL FILL A. Structural Fill shall consist of granular well -graded material with a fines content less than 25 percent (percent passing the #200 sieve based on the minus three-quarter inch fraction). Some rockery applications may require the use of "select- free -draining Structural FIII Material. Structural Fill Material shall be approved and tested by the Geotechncial Engineer. STRUCTURAL GEOGRID INSTALLATION A. Geogrid shall be oriented with the highest strength axis perpendicular to the rockery alignment. B. Geogrid Reinforcement shall be placed at the strengths, lengths, and elevations shown on the construction design drawings or as directed by the Geotechnical Engineer. C. The geogrid shall be laid horizontally on compacted backfill and extend to the back of the rockery. The geogrid shall be pulled taut and anchored prior to backfill placement on the geogrid. D. Geogrid Reinforcements shall be continuous throughout their embedment lengths and placed side -by -side to provide 100% coverage at each level. Spliced connections between shorter pieces of geognd or gaps between adjacent pieces of geogrids are not permitted. REINFORCED BACKFILL PLACEMENT A. Reinforced Backfill shall be placed, spread, and compacted in such a manner that minimizes the development of slack in the geognd and installation damage. B. Reinforced Backfill shall be placed and compacted in lifts not to exceed 6 inches where hand compaction is used, or 8 to 10 inches where heavy compaction equipment is used. Lift thickness shall be decreased to achieve the required density as required. C. Reinforced Backfill shall be compacted to 95 %of the maximum density as determined by ASTM D1557. The moisture content of the backfill material prior to and during compaction shall be at or near the optimum moisture content. D. The required compaction shall extend all the way to the back of the Rockery and Filter Drain Rock Zone. E. Only lightweight hand -operated equipemnt shall be allowed within 3 feet of the back of the rockery. F. Tracked construction equipment shall not be operated directly upon the geognd reinforcement. A minimum fill thickness of 6 inches is required prior to operation of tracked vehicles over the geogrid. Tracked vehicle turning should be kept to a minimum to prevent tracks from displacing the fill and damaging the geogrid. G Rubber tired equipment may pass over geognd reinforcement at speeds less than 10 mph. Sudden braking and sharp turning shall be avoided. H. At the end of each day's operation, the Contractor shall slope the last lift of reinforced backfill away from the rockery to direct runoff away from wall face. The Contractor shall not allow surface runoff from adjacent areas to enter the wall construction site. gyrro rr+v 2Mn R°aF Exposed Rockery Height H - 6' (Max.) MM1r one-1Nd a 61MnlNM Lowr0rxnTM1d 5 Mn Rak NOTE: Property lines and building footings located per civil plans. 6' setbad 17b78' I I� 1' \�4°• \ be• Rock tend r Drain Rock •� a'• (Extend Along Engre Height t � o-e o a �-0• of Rodery) �� e�'0• Le era 8 •0•.e, d ro• e Reinforced Fill 4• Diameter Perforated PVC Drain Pipe (By Others) Connect to Approved Discharge ENGINEERED FILL ROCKERY DETAIL NOT -TO -SCALE 6xT Structural Fill �=III Competent Cut (Geotechnical Engineer to Confirm) Finish Grade shall slope away from back of rockery or top of slope at 2 Percent or as approved by the Geolechndal Engineer. 12'to 18' 2% Slope NOTE: Property lines and building footings located per civil plans. III r / / / / A 2 Man Rat: Qo• / 8 °Qo Competent Cut / oe 0.. e. ro °e.°,p • (Geotechnical Engineert6 Confirm) b. o-e / Re Exposed Rockery Height 1 u•0,•4+0•R 1 H = 6' (Max.) \\ a Q w.°ee �4• = 1 �/ Footing element moat be placed beyond _ Mmma o� mw a 64 Man Rou: NP w° 1= V / the l H: 1V projection as drawn from the r e ro' 0.6 oro. 9' / bad of the base rock. R 0.• o e. / aw. a Q / 2Drain Lww PrTkhl � .i•. e•s, a Filter Drain Rod / Along Entire Height s Mn \ --T' ,>;• •ti e: (Extend of Rookery) r .4e•�� -< a^ III= 4' Diameter Perforated PVC Drain Pipe (By Others) Connect to Approved Discharge SINGLE - TIER COMPETENT CUT ROCKERY DETAIL NOT -TO -SCALE R-391512 fin O Z Q J O � C (0 I— -- O cd rn U) 0 >_ W 0 O J Z C: (1) U L.L O T LO LO C\I N O O m