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Embed Size px x x x x This standard is issued under the fixed designation D ; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense.
Thistest method can be used as part of a procedure for soilinvestigation for foundation design. It gives information on thesoil only to a depth equal to about two diameters of the bearingplate, and takes into account only part of the effect of time.
The SI units given in parentheses are forinformation only. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.
Significance and Use. The bearing capacity of a soilis not simply a soil strength parameter, but it also depends onthe magnitude and distribution of the load, dimension, andgeometry of the loading plate and depth of embedment orelevation of testing. This bearing capacity can be used in soilinvestigations and for the design of foundations. The force-measuringdevices should be capable of recording the load with an error. As an alternative, three small concrete footingsof the size mentioned or larger can be cast in-situ.
Suchfootings must have a depth of not less than two thirds of theirwidth. NOTE 1Testing assemblies may vary widely, depending on jobconditions, testing requirements, and equipment available. The testingassembly and program should be planned in advance and approved by thesupervising engineer, and in general can permit considerable latitude indetails within the specific requirements noted above and outlined in thefollowing test procedure.
A typical assembly for conducting load tests isillustrated in Fig. Unlessotherwise specified, make the load test at the elevation of theproposed footings and under the same conditions to which theproposed footings will be subjected. At the selected elevationplace the bearing plates at the same relative depths depthsexpressed in plate diameters as the actual footing. NOTE 2For footings placed under permanently excavated basementsthe depth of the actual footing is construed as the depth from the basementlevel or depth over which the surcharge is permanently acting, rather thanthe depth from the ground surface.
NOTE 3If the mentioned condition of equal relative depth cannot bemet for practical reasons, the test results must be interpreted by using anappropriate theory of bearing capacity. Also make corrections for theeffects of the shape and size of the footing and the effects of the watertable as appropriate.
Current edition approved March 15, Published May Originallypublished as D 52 T. Last previous edition D 72 e1. Carefully level and clean the areas to be loaded by the testplates or footings so that the loads are transmitted over theentire contact areas on undisturbed soil. Prior to loading,protect test pits and areas against moisture changes in the soilunless it is expected that wetting of the soil will occur at somefuture time, as in the case of hydraulic structures.
In this case,prewet the soil in the area to the desired extent to a depth notless than twice the diameter of the largest bearing plate. The total load required for the test shallbe available at the site before the test is started. Accurately measure each load, and applyit in such a manner that all of the load reaches the soil as astatic load, without impact, fluctuation, or eccentricity. NOTE 4Longer time intervals may be determined by maintaining theload until the settlement has ceased or the rate of settlement becomesuniform.
However, maintain any type of time interval so selected for eachload increment in all tests of any series. Make settlement measurements as soon as. After completion of observa-tions for the last load increment, release this applied load inthree approximately equal decrements. Continue recordingrebound deflections until the deformation ceases or for a periodnot smaller than the time interval of loading.
NOTE 5The following alternative loading procedure is also permis-sible: Apply the load to the soil in increments corresponding to settlementincrements of approximately 0. After theapplication of each settlement increment, measure the load at some fixedtime intervals, for example, 30 s, 1 min, 2 min, 4 min, 8 min, and 15 min,after load application, until the variation of the load ceases or until the rateof variation of the load, on a load versus logarithm-of-time scale becomeslinear.
Continue loading in selected settlement increments. Termination oftests and unloading are made in the same manner as in 4. No available methodsprovide absolute values for the bearing capacity of soil in placeagainst which this method can be compared. The variability. View 3. Designation: D 94 Standard Test Method forBearing Capacity of Soil for Static Load and SpreadFootings1 This standard is issued under the fixed designation D ; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
Significance and Use 2. Copyright ASTM times the diameter of the largest plate used in the tests. Make settlement measurements as soon as possible before and after the application of each load incre-ment, and at such equal time intervals, while the load is beingheld constant, as will provide not less than six settlementmeasurements between load applications.
Precision and Bias6. Advanced Footings excel Documents. Semanario Zona Norte Documents. Lecture10 Combined Footings Documents. Advanced Footings Documents. Spread footings for columns Engineering.
Field Services: Soil testing
This test method is used to estimate the bearing capacity of a soil under field loading conditions for a specific loading plate and depth of embedment. The bearing capacity of a soil is not simply a soil strength parameter, but it also depends on the magnitude and distribution of the load, dimension, and geometry of the loading plate and depth of embedment or elevation of testing. This bearing capacity can be used in soil investigations and for the design of foundations. Atlanta Toggle navigation. Geocomp's staff have extensive experience and are unique in our ability to monitor any type of structure in real-time before, during, and after construction. Geocomp conducts structural health monitoring to provide structural life extension for critical infrastructure.
ASTM D1194-94, Bearing Capacity of Soils for Static Load & Spread Footings
Copyright ASTM. Standard Test Method for Bearing Capacity of Soil for Static Load and Spread Footings1 This standard is issued under the fixed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. This less than 1 in.