Bearing capacity of soil from spt value

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bearing capacity of soil from spt value

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Join Eng-Tips Forums! Join Us! By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. Related Projects. Is there any reference material that lists values of soil bearing capacities for various soil types given the N-values taken from Standard Penetration Tests? The bearing capacity of soils for shallow foundations generally follows the acceptable Terzaghi-Meyerhof equation.

To get the acceptable, you may use a factor of safety of 3. Gamma is the overburden pressure c is the undrained shear strength or 0. Ny,Nc and Nq are capacity factors, and need to be looked from a chart.A soil shear failure can result in excessive building distortion and even collapse. Excessive settlements can result in structural damage to a building frame nuisances such as sticking doors and windows, cracks in tile and plaster, and excessive wear or equipment failure from misalignment resulting from foundation settlements.

It is necessary to investigate both base shear resistance ultimate bearing capacity and settlements for any structure. In many cases settlement criteria will control the allowable bearing capacity. Except for occasional happy coincidences, soil settlement computations are only best estimates of the deformation to expect when a load is applied. A small computed AH of 10mm, where the measured value is 5 or 20 mm, has a large error, but most practical structures can tolerate either the predicted or measured values.

What we do not want is an estimate of 25 mm and a subsequent settlement of mm. Generally, the final settlement of a foundation is of interest and U is considered equal to 1 i. Also See: GeoTechnical Engineering.

A major problem is of course to obtain correct stress-strain modulus Es. Es can be found from laboratory tests like unconfined compression tests. The above equation for Is is strictly applicable to flexible bases on the half space. In practice, most foundations are flexible because even every thick footing deflects when loaded by superstructure load. The half space may consist of either cohesion less material or any water content, or unsaturated cohesive soils. After primary consolidation the soil structure continues to adjust to the load for some additional time.

At the end of secondary consolidation the soil has reached a new K o -state at-rest state. Secondary consolidation may be the larger component if settlement in some soils, particularly in soils with a large organic component.

Commonly initial thickness is used unless the primary consolidation is very large. Total settlement is the magnitude of downward movement.

Differential settlement is non-uniform settlement. It is "the difference of settlement between various locations of the structure. Angular distortion between two points under a structure is equal, to the differential settlement between the points divided by the distance between them. Theoretically, no damage will be done to a structure if it settles uniformly as a whole regardless of how large the settlement may be.

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The only damage would be to the connections of the underground utility lines.The standard penetration test SPT is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of soil.

This test is the most frequently used subsurface exploration drilling test performed worldwide. The test provides samples for identification purposes and provides a measure of penetration resistance which can be used for geotechnical design purposes. Many local and widely published international correlations which relate blow count, or N-value, to the engineering properties of soils are available for geotechnical engineering purposes.

The test uses a thick-walled sample tube, with an outside diameter of This is driven into the ground at the bottom of a borehole by blows from a slide hammer with a mass of The sum of the number of blows required for the second and third 6 in. The blow count provides an indication of the density of the ground, and it is used in many empirical geotechnical engineering formulae.

The main purpose of the test is to provide an indication of the relative density of granular deposits, such as sands and gravels from which it is virtually impossible to obtain undisturbed samples.

The great merit of the test, and the main reason for its widespread use, is that it is simple and inexpensive.

Bearing Capacity Of Soil - Bearing capacity of Different types of soil -

The soil strength parameters which can be inferred are approximate, but may give a useful guide in ground conditions where it may not be possible to obtain borehole samples of adequate quality like gravels, sands, siltsclay containing sand or gravel and weak rock. In conditions where the quality of the undisturbed sample is suspect, e. If the samples are found to be unacceptably disturbed, it may be necessary to use a different method for measuring strength like the plate test.

When the test is carried out in granular soils below groundwater level, the soil may become loosened. In certain circumstances, it can be useful to continue driving the sampler beyond the distance specified, adding further drilling rods as necessary.

Although this is not a standard penetration test, and should not be regarded as such, it may at least give an indication as to whether the deposit is really as loose as the standard test may indicate. The usefulness of SPT results depends on the soil type, with fine-grained sands giving the most useful results, with coarser sands and silty sands giving reasonably useful results, and clay and gravelly soils yielding results which may be very poorly representative of the true soil conditions.

Soils in arid areas, such as the Western United Statesmay exhibit natural cementation. This condition will often increase the standard penetration value. The SPT is used to provide results for empirical determination of a sand layer's susceptibility to soil liquefactionbased on research performed by Harry Seed, T.

Leslie Youdand others. Despite its many flaws, it is usual practice to correlate SPT results with soil properties relevant for geotechnical engineering design. SPT results are in-situ field measurements, and not as subject to sample disturbance, and are often the only test results available, therefore the use of correlations has become common practice in many countries.

An approximate relationship cited in the US Army Corps of Engineers engineering manual publication on sheet pile design developed after Terzaghi and Peck and Tengshows in the table below the relationship specifically for SPT N values and bulk density of soil correlated to relative density and referred to in the engineering manual as moist unit weight in pcf units, converted to metric values in the table [2].

The standard penetration test recovers a highly disturbed sample, which is generally not suitable for tests which measure properties of the in-situ soil structure, such as density, strength, and consolidation characteristics.It was a pleasure to be able to meet him and thank him in person when we dropped our mobile phone off at the Nordic Visitor office at the end of our trip.

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bearing capacity of soil from spt value

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bearing capacity of soil from spt value

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bearing capacity of soil from spt value

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