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<br />loads to a small area. Skin friction by penetration into bedrock will <br />provide uplift resistance for overturning. Spread footings bearing on <br />the claystone bedrock era a satisfactory alternative. In the latter <br />case, bath overturning and uplift due to swell potential must be considered. <br />Conveyor System: Foundation material types generally vary from claystone <br />bedrock in reclaim substructures to clay soils in elevated line areas. <br />Due to the erratic swell-consolidation characteristics and depth of clay <br />soils, we believe spread footings on bedrock or straight-shaft piers <br />drilled Into bedrock are most desirable type foundations. They should <br />be designed for the same minimum dead load criteria as discussed for the <br />_ train loadout structure. Providing differential movement as discussed <br /> for the crusher can be tolerated, spread footings on the uppe r clays <br />• f <br />i <br /> actory alternative. <br />will be a sat <br />s <br /> If tunnel portions of the conveyor system era placed on claystone, <br /> theta is a possibility of differential movement with respect to the <br /> .portion pTacad on overburden soils or with the remaining line on piers. <br /> To minimize potential movement, good surface drainage should be provided <br /> adJacent to the tunnel, and backfill around the tunnel should be well <br /> compacted so that wator has less chance of wetting the founda tion soils. <br /> Office and Change House: Straight-shaft pier foundations dri lled into <br /> the claystone bedrock era most desirable for support. Spread footings <br /> bearing upon natural clay soils could also be used. Results of a sweli- <br /> consolidation fast, FIg. 19, indicate nil swell potential and consoitda- <br /> Tion at higher stress levels. Results on other clay samples; however, <br />• indicate a, much higher swell potential. Therefore, footings will likely <br /> <br />