Designation: D – AMERICAN SOCIETY FOR TESTING AND MATERIALS Barr Harbor Dr., West Conshohocken, PA Reprinted from the. Buy ASTM D TEST METHOD FOR BEARING CAPACITY OF SOIL FOR STATIC LOAD AND SPREAD FOOTINGS from SAI Global. ASTM: D AASHTO: T Apparatus. Loading platform of sufficient size and strength to supply the estimated load. Hydraulic or mechanical.

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Ret-Ser Engineering Agency assisted in setting up field load test equipment, and Mr.

These samples were used in the laboratory for determination of unit weight, specific gravity, and particle-size distribution. In reality, q and interact with each other and are difficult to estimate.

Experience has shown d1194-944 the plate-load test can provide reliable estimates of vertical modulus for settlement calculations Canadian Geotechnical Society In this regard, it is an important issue to select an appropriate equivalent KS value in the structural design of mat foundations. To accommodate larger size plates, it was decided to use eight reaction anchors, each carrying an allowable load of up to kN t.

Large Scale Plate Load Tests

However, Terzaghi’s values were established primarily from the viewpoint of soil mechanics and did not consider the effect of structure stiffness. A simpler, empirical equation has been proposed by Scott for sandy soils, which relates KS to standard penetration resistance N.

Beneath the alluvial fan gravel and cobble deposits asttm the Late Pleistocene conglomerate formation, which extends as deep as m.

The results of these plate-load tests are presented in this paper. A relationship between deformation modulus and SPT N for gravels.

Large Scale Plate Load Tests | Gulf Foundation FZE

The space between the top and base plates is backfilled with selected soils. This reinforces the observation about the relationship between the modulus of subgrade reaction and the size of the plate in the case of the gravelly cobble deposit. Figure 11 shows the relationship wstm the modulus of subgrade reaction and the size of the plate.

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The third layer, from 2 to 2. Obviously, the soil in the present study is a rather complicated, nonhomogeneous deposit. This gave a total allowable load of kN t.

Soil adtm taken from the test pit were sieved through a set of sieves ranging in size from A sophisticated subgrade reaction model for mat foundations has also been proposed by Horvath In this calculation, a reduction factor of 0. The qu values of the 0. For each plate-load test, a contact pressure of about Canadian foundation engineering manual.

Thus, while the plates were seated at different locations beneath the main reaction beam, the ASTM distance specification was not followed. To interpret the results, the ultimate bearing capacity qu is defined herein as the load or most precisely, the pressure at the intersection of the tangent to the initial portion of the curve and the tangent to the last portion of the curve.

The following conclusions may be drawn based on the results of the present study of a gravelly cobble deposit: The plate-load test has been a traditional in situ method for estimating soil modulus for the purposes of estimating the settlement of spread footings. The values of in Table 1 are practically aastm regardless of the size of the plate in the present study. Geologic map of Taichung Basin. Plate-load tests were the focus of the experimental program.

Figure 10 shows a similar trend, although the relation is not exactly linear. These methods, however, require knowledge of other soil parameters that are also difficult to estimate, such as the modulus of elasticity and Poisson’s ratio.

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Note that reseating of each plate before loading was necessary, as the three plates were placed at different locations.

d1914-94 Thus, the modulus of subgrade reaction KS is not just a soil parameter, it asstm also affected by the structural stiffness. The test site is located in the City of Taichung, Taiwan, which is in the Taichung Basin, a concave Neotectonic basin located in midwest Taiwan.

Note that in all bearing-capacity calculations reported herein, the groundwater table was assumed to be at a depth of 6. Ruler is approximately 30 cm long.

In the first stage, where the load is less than kN tthe load is measured by a load gauge which has a maximum capacity of only kN t but is more accurate. Principles of foundation engineering.

Complete setup for the plate-load test. The soil profile of the test site is shown in Fig. Soil is an inelastic, nonhomogeneous material, and thus a precise characterization of its mechanical behavior usually requires more than two parameters.

The test procedure and placement of other devices are summarized as follows: Introductory soil mechanics and foundations, The McMillan Co. However, the decreasing trend is not as sharp as those suggested by Terzaghi eqs.

Evaluation of coefficients of subgrade reaction. The groundwater table was maintained below the plate at a depth of about 6. In local practice for structural design of mat foundations, structural engineers prefer to model the soil mass as a series of elastic springs, known as the Winkler foundation.