In case of doubt, the consistency of the soil under test shall be determined atvariousdepthsup toadepth,d, belowground levelddiameterofloading plate. These would likely tell you why the plate bearing values were so disparate. Pdf final report of the plate load test at ibn firnas housing. The pressure exerted is added at a consistent rate. In the geotechnical world, an agreed rule of thumb is that during the test a depth of material approximately twice the plate diameter will be stressed, so its important to know what depth you want this zone of influence to be for your testing. Pdf evaluation of soil bearing capacity by plate load test qasim. Carefully level and clean the areas to be loaded by the test plates or footings so that the loads are transmitted over the entire contact areas on undisturbed. Equipment for the plate bearing test includes a load reaction device, a hydraulic jack assembly, bearing plates and the necessary dial gauges, mounts and miscellaneous tools. Plate bearing tests for design of flexible and rigid pavements. The plate bearing test takes a straightforward process whereby, the plates undergo subjection to various pressure amounts, and the record making happens. The plate load test basically consists of loading a steel plate placed at the foundation level and recording the settlements corresponding to each load increment. In this test a square or circular rigid plate of standard dimension generally 300 mm2 for square or 300 mm dia for circular is placed at foundation level and load is applied in increments.
Place the hydraulic jack on the plate and place the surcharge above the jack piston up to steel beam level. In this a compressive stress is applied to the soil pavement layer through rigid plates of relatively large size and the deflections are measured for various stress values. The plate load test is a field test, which is performed to determine the ultimate bearing capacity of the soil and the probable settlement under a given load. Standard test method for nonrepetitive static plate load tests of soils and flexible pavement components, for use in evaluation and design of airport and highway pavements, astm, us. The dynamic bearing capacity of a 15inch diameter bearing plate on dry sand without overburden was 90 percent higher than he static bearing caoacity. This method is useful to solve the design problems for. Set the bearing plate level in a thin bed of a mixture of 1 this test method is under the jurisdiction of astm committee d04 on road. This test method can be used as part of a procedure for soil investigation for foundation design. It is worth noting that the stress influence zone is generally two times the plate. Standard test method for bearing capacity of soil for. For performing this test, the plate is placed at the desired depth, then the load is applied gradually and the settlement. The cbr test can also be used to get the curve of the loadsettlement of the soil in the field which is more or less similar to the plate load test objective. Plate bearing ratio test vs california bearing ratio testing.
The plate bearing test is normally carried out at foundation level, either on the surface or in a shallow pit. Plate bearing test plate load testing site testing. Standard test method for bearing capacity of soil for static. A method to compute ultimate bearing capacity of soil from a short test has been suggested. The records taken are then plotted on a graph to determine the bearing capacity value of the ground tested. Chulalongkorn university saraburi campus contractor.
These tests were performed to verify adequate support for heavy lift cranes whose pads would bear on the exposed surface. Also, the dynamic bearing modulus was considerabiy higher than the static. The plate load test is one of the most accepted and frequently used geotechnical field tests for shallow foundation and pavement design. The plate is loaded by hydraulic jack and its settlement measured in increments. The allowable bearing capacity, with a factor of safety of 2, would be one half of the ultimate bearing capacity. Plate load bearing tests are used for many purposes. The activity of plate bearing test is performed in order to determine the bearing capacity of soil underneath that is likely to take the anticipated load of temporary or a permanent structure. Jun 21, 2015 the plate bearing test carried out in the uk. To calculate safe bearing capacity suitable factor of safety is applied. Results from the test can be used as design parameter or used to confirm the design assumption. Plate load test is done at site to determine the ultimate bearing capacity of soil and settlement of foundation under the loads for clayey and sandy soils. The american and british standards for the plate bearing test are similar. Plate bearing test procedure and calculation plate bearing test is an activity carried out by design engineers in the field to determine the bearing capacity with regards to the soil underneath.
Determination of equivalent californian bearing ratio by plate bearing test lab test reference 610 test procedure reference d croney 1. Plate bearing test procedure and calculation cbr testing uk. The test results reflect only the character of the soil located within a depth of less than twice the width of the bearing plate. Plate bearing test also known as plate load test or static loading test, is an insitu load bearing test of soil. Plate load test is done at site to determine the ultimate bearing capacity of soil and settlement of foundation under the loads for clayey and. The accurate estimation of soil bearing capacity plays an important role in the design of a stable foundation for road pavement and airfields projects. Plate bearing test plate bearing test is an important field test for determining the bearing capacity of the foundation. In this method the soil is gradually loaded up to 1. A test pit of the same depth as the foundation and width equal to five times the size of bearing plate is dug in the ground. Pdf on jan 1, 2007, nakul dev and others published bearing capacity determination using plate load test a case study find, read and cite all the research you need on researchgate. Plate load test is a field test, which is performed to determine the ultimate bearing capacity of soil and the probable settlement under a given load. The test shall be carried out in general accordance with bs 77. The size of the bearing plate chosen for a test depends on the type of soil.
Plates of varying sizes up to 720mm diameter are available. Plate load test is one of the quick, direct and economic methods for soil bearing capacity determination. This test is normally carried out during the design of traffic surfaces or in shallow foundations. This test is very popular for selection and design of shallow foundation. Plate load test equipment, procedure, calculation civil. A bearing plate usually 30 cm square or diameter and 25 mm thick is then placed in the test pit. Nov 08, 2015 plate load test is a field test which is commonly adopted to determine the bearing capacity and settlement of soil under a given condition of loading. Aug, 2015 plate load test best ppt useful search 1. Plate bearing test the plate bearing test is conducted in a pit at a required depth as per field authority. A circular plate having a maximum diameter of 300 600mm shall be used. The ultimate bearing capacity is sometimes considered as the load at which settlement of 25mm occurs. This test is used to measure settlement of soil, earthworks, ground, pile mats, crane pads and other construction and geotechnical materials under. Evaluation of allawable bearing capacity of soil by plate bearing. In rock, plates larger than mm diameter may be used, depending on the jointing frequency.
Making the assumption that the plate settlement is the same of an elastic halfspace, until the limit pressure is reached, the stressstrain modulus, es, can be expressed from results of a plate load test in terms of the ratio of bearing pressure to plate settlement, as stated in eq. Soil testingproceduresandtestingequipment plateloadtest. Hixtra plate bearing testing, cbr testing full uk coverage. Plate load test is a field test for determining the ultimate bearing capacity of soil and the likely settlement under a given load. Feb 25, 2017 plate load bearing tests are used for many purposes. The test plate shall be placed over a fine sand layer of maximum thickness of 5mm. Plate bearing test technical data sheet southern testing. Set the remaining plates of smaller diameter concentric with, and on top of, the bearing plate. Pdf bearing capacity determination using plate load test. The results can then be used to determine whether the ground has sufficient bearing capacity to support structures or temporary cranes or piling rigs. Introduction plate load tests are important field tests for geotechnical engineering practice.
Plate bearing test is carried out in the field to serve this purpose. Did you check the moisture content of the inplace soil at each location. After doing the plate bearing test, did you run an inplace density test of the soil below the plate. Plate bearing test procedure and calculation cbr testing.
This test is used to measure settlement of soil, earthworks, ground, pile mats, crane pads and other. Plate load testing is usually used for the verification of the bearing capacity of the land of the substrate, of the foundation layer and the base layer of the flooring, although it is not uncommon to its use to investigate the bearing capacity of the soil surface or to the state compaction of granular materials and road surfaces. Cbr vs plate bearing test soil testing engineering engtips. Pdf evaluation of soil bearing capacity by plate load test. Standard test method for repetitive static plate load tests. Plate bearing test used to determine the ultimate bearing. Bearing capacity of soil by plate load bearing test. Mar 18, 2015 to perform plate load test to obtain a loadsettlement curve of a soil at a particular depth so as to estimate the ultimate bearing capacity a foundation. It gives information on the soil only to a depth equal to about two diameters of the bearing plate, and takes into account only part of the effect of time. Did you do a manual auger boring to a depth of 4 to 6 feet below the plate after testing. Sep 27, 2018 plate bearing test also known as plate load test or static loading test, is an insitu load bearing test of soil. Plate load test is one of the quick, direct and economic methods for soil bearing capacity.
This is the method of conducting the load test on soils and the evaluation of bearing capacities and settlement from this test. Plate bearing tests for design of flexible and rigid pavements introduction during the summer and fall of 1951 a test section was constructed at the joint highway research project test road in connection with a special research project. The total load required for the test shall be available at the site before the test. Mackintosh probe test to be carried out at load test location center of plate at testing leve l before the test for calibration purpose. Plate load test for calculation of bearing capacity and. The loading plate is placed on the ground and connected via a load cell to a reaction load. Test plate of square size 300 mm or 450 mm or 600 mm or 750 mm hydraulic jack 50 t capacity hydraulic pump 50 t capacity pressure gauge to read 50 t load with a sensitivity. Due to the larger size of the plate used compared with a cbr test this test is. In shallow foundation design, the plate load test can be used to determine the stresssettlement relationship, the bearing capacity, and failure modes of shallow. The reaction device can be a truck or another structure 3. The test load is gradually increased till the plate starts to sink at a rapid rate. Plate load test for calculation of bearing capacity and settlement. Astm d1194 94 standard test method for bearing capacity of.
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