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M03107GE <br />engineering recommendations for constructing compacted structural • <br />fill are presented below. <br />As an alternative to supporting the footings on a blanket of <br />compacted structural fill the foundations may be designed with <br />additional structural reinforcing to bridge point loads which may <br />be applied on the foundations supported on cobbles. The additional <br />structural reinforcing should be adequate to bridge a point load <br />equal to the bearing pressures of several linear feet of the <br />footing without allowing the footing or foundation wall to crack. <br />The structural engineer should be contacted to provide the founda- <br />tion structural design. If the foundations are adequately rein- <br />forced to bridge point loads, then the footings may be supported on <br />the natural exposed compacted soil materials and designed using the <br />bearing capacity provided below. We are available to discuss this <br />concept with you. , <br />The structure may be founded on spread footings. Spread footings <br />may be placed either on the natural undisturbed soils or on a <br />blanket of compacted structural fill. The blanket of compacted <br />structural fill is to help provide uniform support for the footings <br />and to help reduce the anticipated post construction settlement. <br />The anticipated post construction settlement and associated fill <br />thickness supporting the footings are presented below. If 'the <br />footings are supported on a blanket of compacted structural fill <br />the blanket of compacted structural fill should extend beyond each • <br />edge of each footing a distance at least equal to the fill thick- <br />ness. This concept is shown on Figure 8. Geotechnical engineering <br />recommendations for constructing compacted structural fill are <br />presented below. <br />A blanket of compacted fill will help to mask the influence of <br />the.measured swell pressures when the foundation soils become <br />wetted, If you choose spread footings we strongly recommend high <br />design dead load, deep embedment and a thick fill blanket. <br />The bearing capacity will depend on the minimum depth of embedm- <br />ent of the bottom of the footings below the lowest adjacent grade <br />and the support characteristics of the soils supporting the founda- <br />tion. Other characteristics may influence embedment. The embed- <br />ment concept is shown on Figure 9. Bearing capacity and associated <br />minimum depth of embedment of the bottom of the footing below the <br />lowest adjacent grade are presented below. <br />10 <br /> <br />Lambert ana ~~,~ociates <br />CONSUI LING GEUTE CIINIGI ENUIN EEHS ANN <br />MAItHIAL Ik511NU <br />