By Peter Bonfield
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Extra info for American Plywood in Roof Construction: A Design Guide (BRE Report)
Isolated rigid foundations Extend to depth where vertical stress decreases to 10 percent of bearing pressure. Generally all borings should extend no less than 9 m (30 ft) below lowest part of foundation unless rock is encountered at shallower depth. 5 times unbalanced height of wall. Where stratification indicates possible deep stability problem, selected borings should reach top of hard stratum. Slope stability Extend to an elevation below active or potential failure surface and into hard stratum, or to a depth for which failure is unlikely because of geometry of cross section.
Drilling procedures which seriously disturb the soil will affect the N value, for example, drilling with cable tool equipment. 5 Factors that can Affect the Standard Penetration Test Results (Continued) Factors that can affect the standard penetration test results Comments Using large drill holes A borehole correction is required for large-diameter boreholes. This is because larger diameters often result in a decrease in the blow count. Inadequate supervision Frequently a sampler will be impeded by gravel or cobbles, causing a sudden increase in blow count.
25, into the borehole and then pushing the vane into the clay deposit located at the bottom of the borehole. 22 Simplified examples of CPT cone resistance qc versus depth, showing possible interpretations of soil types and conditions. com) GEOTECHNICAL ENGINEERING Test sequence After the penetrometer is at test depth, thrust on the inner rod advances the cone for 30 mm. Next the cone and the friction sleeve are advanced together for readings of cone bearing and soil friction. 23 Test sequence for obtaining the sleeve friction from the Dutch cone penetrometer and an example of the test data plotted versus depth.
American Plywood in Roof Construction: A Design Guide (BRE Report) by Peter Bonfield