Plate load test is carried out to check the bearing capacity of foundation soils. Standard test methods for deep foundations under lateral. Explore pile foundation with free download of seminar report and ppt in pdf and doc format. The ibc code is the law but is not as popular as using. Step 11 static load testing test loading is the most definitive method of determining load capacity of a pile. The data in this publication has been prepared in accordance with recognized engineering principles and is based on available technical data.
The reinforcement shall be cut and head levelled with plaster of paris. Criteria for the design of axially loaded drilled shafts. The maximum settlement at test load should not exceed 12 mm. Casting of pile loosening of soil loosening by cutting boring grab this method was developed from the form of a shovel. Instrumentation the basic information to be developed from the pile load test is usually the deflection of the pile butt under the test load. So, plate load test is helpful for the selection and design the foundation. Jun 20, 2012 pile load test hpcl, visakh toyo engineering india ltd. Axial load test procedures for pile foundations introduction because of the nonavailability of reliable procedures for assessing the load transfer mechanisms between piles and surrounding soil, or for determining the ultimate capacity of piles, fullscale load tests are conducted. Jay patel120280106037 naman kantesaria120280106039 udit patel1202801060 applied mechanics departement 2. Objective this test is used to determine the load carrying capacity of a pile. One load test was undertaken on a belled pile end bearing in glacial clay till and a second load test on a straight pile socketed in weak clay shale bedrock. In general two types of pile load tests are conducted.
Load settlement curve for sample of pile load tests. The plate load test is performed for a short time period, so it cannot predict the settlement for a longer period, especially for cohesive soil. Characteristic pile resistance from profiles of ground test results part 2 of en 1997 includes the following annexes. Pile load tests, in practice, are normally executed in two alternative ways. Pile foundation seminar report, ppt, pdf for civil engineering. For the love of physics walter lewin may 16, 2011 duration. The bearing capacity for clayey soil is almost similar to the bearing capacity obtained from the plate load test, but in the case of dense sandy soil, the plate load test provides a conservative value. Plate load test equipment, procedure, calculation civil. For larger load test exceeding 3000 tonnes, the project team can consider using steel plates, tension piles or ground anchors as the reaction load or adopting other alternative method of testing like bidirectional load test. Several commercially available programs were used to perform the calculations described in this chapter.
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. Dynamic and static pile load test data this chapter presents the methodology and results of dynamic and static pile load test data for the selected contracts. Load tests determine the allowable load, the settlement under working load, or the soundness of a pile. 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. Sundaravadivelu,department of ocean engineering,iit madras. Foundation analysis and design 53 journal of geotechnical and geoenvironmental engineering, asce, vol. Pile load test hpcl, visakh toyo engineering india ltd. The test pile will be considered failure when a rapid progressive movement of the pile in the direction of loading under a constant load or physical failure of the test pile is observed or a settlement of more than 15% of the diagonal dimension of the pile, which is equivalent to 90 mm. This timber pile design and construction manual has been developed by the american wood preservers institute awpi as its official recommendation for timber piling design and construction. Pile load capacity calculation methods 85 case c is referred to as the alternative procedure in the note to en 19971 7. This report presents the results of a study to assess the. Structure of the guide introduction to pile foundations pile foundation design load on piles. Austin began a study to investigate the behavior of axially loaded drilled shafts under realistic field conditions. Learn for free, pay a small fee for exam and get a certificate.
Nptel, online courses and certification, learn for free. The test plates shall span across and between any unbraced. The test program involves the direct measurement of pile head displacement in response to a physically applied load. In the interpretation of the load test results, the critical. Mod01 lec17 pile foundation load carrying capacity i. The loadmovement and ocell expansion not shown records indicate that the ocell level residual load in the test piles is approximately 300kn, i. Construction of pile foundation at galanderkandizal bridge. Also explore the seminar topics paper on pile foundation with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year. The load will be applied in increments of 20% of the estimated safe load and at the cut off level. The test pile is loaded using a calibrated hydraulic jack that applies the test load to the pile by pushing against a.
Planning of pile load test setup should starts from the design office. Analysis dynamic analysis load test on pile penetration tests load test on pile. Plate load test to calculate bearing capacity and settlement. Sengupta senior general manager, itd cementation, kolkata700072, india. A comprehensive program of pile load testing was undertaken, and class a predictions of both axial and lateral load deflection behaviour were in fair agreement with the load test results. To calculate safe bearing capacity suitable factor of safety is applied. Determine shear load versus deflection behavior for piles in each row.
Plot load versus pile head deflection results similar to as shown in figure 9. However, the hiley, janbu, and gates equations appear to be among the best in published comparisons of formula predictions versus pile load test results. Test pile preliminary pile design is first carried out on the basis of site investigations, laboratory soil testing, and office study. The load on the jack shall be the same on both the piles. They make sure that the highest standards of quality are maintained at each level to ensure successful testing. This test will be carried out as stipulated in is2911 part iv 1995.
Pile foundation seminar report, ppt, pdf for civil. Load test this test is usually done two times the design load. Converse labarra formula and block failure criterion settlement of pile groups interpretation of pile load test forces on pile caps under reamed piles capacity under compression and uplift. Load application is also very much difficult in this test two more things which have importance in pile foundation design are. Oneill, sunnnarizes the results of previous research and presents criteria for designing drilled shafts. Davisson, department of civil engineering, university of illinois, urbana pile foundations usually find resistance to lateral loads from a passive soil resistance on the face of the cap, b shear on the base of the cap, and c passive soil resistance against the pile shafts.
Pile load test 36 2 selection of shear strength parameters 37 4 chapter 4. Pile supported foundation pile cap analysis and design based on a geotechnical study, a pile supported foundation is required to support a heavily loaded building column. Construction of pile foundation at galanderkandizal. The point of application of the horizontal load should, if possible, simulate inservice conditions. By the term marine pile, it is commonly meant the piles used as a structural part of jetties, wharves, dolphins and other such near shore and off shore structures. The jack should be placed horizontally, between two piles. Pile head the pile head shall be chipped off till sound concrete is met wherever applicable.
Lateral load capacity of piles transportation research board. Pile supported foundation pile cap analysis and design. In initial test, the test load 52 times the working load in work test load is 32 times the design load. Isues, first m relation to single pile behavior, and then with respect to pile groups. For larger ctc spacings or smaller deflections, these pm values should be conservative. This test gives us the value of ultimate load value safe load value settlement under. Further, we are also known for our clientcentric approaches and transparent business dealings. Experiments with instrumented pile groups in sand, american society for testing and materials. Unit v retaining walls 9 plastic equilibrium in soils active and passive states rankines theory cohesionless. The testing of pile will be carried out according to the lndian standard is. Nallayarasu,department of ocean engineering,iit madras. Given the soft and compressible marine clays in the boston area, driven pile foundations were selected to support specific structures, including retaining walls, abutments, roadway slabs, transition structures, and ramps. For performing this test, the plate is placed at the desired depth, then the load is applied gradually and the settlement. We have appointed experienced engineers, who have been working in this domain for years.
For drilled shafts or micropiles, locate these support piles not less than 10 ft. Design the pile cap shown in the following figure with 12 in. Pile load tests are then carried out to refine and finalize the design. Testing a pile to failure provides valuable information to the design engineer and is recommended for load tests performed prior to the foundation design. In accordance with the relevant provision of the indian standard ls. The test plate shall have side dimensions not more than, and not less than one half of, the diameter or side dimension of the test piles. This test gives us the value of ultimate load value safe load value settlement under different values of loads 3.
The initial test is performed before the start of construction to assess the design adequacy. This test is very popular for selection and design of shallow foundation. The load movement and ocell expansion not shown records indicate that the ocell level residual load in the test piles is approximately 300kn, i. Design and construction of driven pile foundations lessons learned on the central arterytunnel project chapter 4. Plate load test for calculation of bearing capacity and. All pile load test results were analyzed using the six different interpretation methods mentioned above 0 4 8 12 16 20 0 50 100 150 200 250 300 350 400 450 500 550 load, q ton settlement, s mm pile no. Analysis and design general 41 41 design criteria 42 1 pile capacity 43 10 settlement 421. Also explore the seminar topics paper on pile foundation with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2015 2016. By estimating the required length of penetration into the loadbearing material, the lengths of piles may be reasonably approximated. This paper describes a process by which pile load test data can be used to assist in the prediction of pile foundation settlements. It could only give the bearing capacity of soils with depth up to two times the diameter of plate. Static pile load testing is one of the most common methods for testing the actual insitu capacity of a pile. Capwap analysis is made on the pda data after the test is complete. Because the iowa dot pile load tests used in calibration were conducted at a time when standard penetration test hammers averaged about 60% efficiency and because the industry is.
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