The usual steps taken during the consolidation test are as follows. Indian institute of technology gandhinagar department of civil engineering soil mechanics laboratory consolidation test oedometer test is 2720part151986 reaffirmed2002 theory. The total settlement st measured in the laboratory is the sum of the settlement of the soil s and the settlement in the apparatus sa,so s is calculated as. Long term settlement in clayey soils has posed a challenge to engineers for literally thousands of years. Civ e 353 geotechnical engineering i consolidation. The specimen is placed between 2 porous stone discs, with the upper one having a diameter slightly smaller than that of the metal ring and the lower one slightly larger. Consolidation test results, triaxial permeability values, and. Oedometer labs test lab report example topics and well written essays. Consolidation test consolidation test objective to. First step is to collect the soil specimen using consolidation metal ring. Falling head permeability test lab report 6nge1yyd92lv. Consolidation test results, triaxial permeability values.
Pdf consolidation test lab manual abdul abdul academia. The settlement values obtained by this test are due to primary consolidation only which is 90% of the total consolidation. Pdf on jun 7, 2015, jaafar mohammed and others published consolidation of soils. From this test some consolidation parameters such as coefficient of consolidation c v, coefficient of volume compressibility m v, compression index c c, preconsolidation pressure p c can be determined. Snu geotechnical and geoenvironmental engineering lab. Ce 344 geotechnical engineering sessionali lab manual. Laboratory testing the coefficient of consolidation c v can be evaluated using information obtained from the laboratory consolidation test if, each time you put a load increment on the sample, you monitor the change in the height of the sample over time. Pdf consolidation of soils testing and evaluation researchgate. Class 7 consolidation test geotechnical engineering. Oedometer consolidation test analysis by nonlinear regression. Test procedure for consolidation test of soil contains following steps. A model which includes the initial compression, the primary consolidation, and the secondary compression is used.
The test is conducted to determine the settlement due to primary consolidation. The soil sample is assumed to be representing a soil layer in the ground. The test results can be greatly affected by sample disturbance. Apr 16, 2015 class 7 consolidation test geotechnical engineering slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Iit gandhinagar, soil mechanics lab page 1 indian institute of technology gandhinagar department of civil engineering soil mechanics laboratory consolidation test oedometer test is 2720part151986 reaffirmed2002 theory. Consolidation test lab experiment 3 letter of transmissal the main parts in this report comprise of procedures, results, objectives and conclusions made during clay consolidation tests conducted in the soil mechanics laboratory. As discussed in the last class, c v transforms a plot of u as a function of t into a plot of.
Jan 18, 2015 ce 326 webcast on the one dimensional consolidation test, section 10. The coefficient of permeability is defined as the flow rate under laminar flow conditions through a unit cross sectional are of porous medium under unit hydraulic gradient. Estimating foundation settlement by onedimensional consolidation tests by harold j. The test determines two important consolidation parameter of clays, i. Cc vertical consolidation test introduction replicates terzaghis assumptions of.
Principles of one dimension consolidation test in one dimension consolidation test, the soil sample is constrained so that it can only settle axially. Different loads are added from day one to day five and the change in height of the soil samples are measured. The applied pressure is then increased in increments, usually with the stress doubled each time. Mar 04, 2015 dzaklo courage kwasi soil mechanics 2 report 3 1 consolidation test oedometer 1. The concise, abbreviate report form is found at the end of each test section of the laboratory manual. Civ e 353 geotechnical engineering i consolidation civil engineering 2006 page 2 of 10 department of primary consolidation 2. This normally involves bringing a soil sample to the laboratory, subjecting it to a series of loads, and measuring the corresponding settlements. Objective consolidation test is used to determine the rate and magnitude of soil consolidation when the soil is restrained laterally and loaded axially. The coefficient of consolidation c v can be evaluated using information obtained from the laboratory consolidation test if, each time you put a load increment on the sample, you monitor the change in the height of the sample over time. When a saturated soil mass is subjected to a load increment, the load is usually carried. A laboratory consolidation test is performed on an undisturbed sample of a cohesive soil to determine its compressibility characteristics. Consolidation test video lecture of consolidation of soil chapter from soil mechanics subject for civil engineering students. Laboratory consolidation studies are almost entirely limited to soils of low. Consolidation cell it is also known as the oedometer.
Consolidation test determines parameters for the time dependent behavior of soils. The user can determine and assign different time intervals or select fixed time intervals and stresses for the calculation of the consolidation test data. Engineering properties of soils based on laboratory testing. Bruckmann3 introduction deepsea sediments deposited at or near an actively spreading midocean ridge experience a distinctly different thermal history than sediments deposited in other marine geotectonic settings. If the soil swells under the seating load, then the seating load is increased until equilibrium is established. Oedometer labs test lab report example topics and well. Geotechnical engineering i consolidation 2006 page 5 of 10 department of civil engineering 6. Consolidation test on soil by consolidometer or oedometer. Consolidation test is used to determine the rate and magnitude of soil consolidation when the soil is restrained laterally and loaded axially. The papers provide a detailed introduction to the subject of triaxial testing, including the many variations available for assessing soil response across a range of engineering applications. Need and scope the test is conducted to determine the settlement due to primary consolidation. Bringing soil samples into the laboratory and subjecti ng them to a series of loads and measuring the corresponding settlement can determine the compressibility of undisturbed or remoulded samples of fine soils such as clays and clayey silts. To determine the settlements due to primary consolidation of soil by conducting one dimensional test.
Therefore, consolidation of a finegrained soil takes longer to complete than that of a coarsegrained soil. The test of falling head permeability test is carried out to determine the permeability of soils of intermediate and low permeability than is less than 10 4 ms. In this way, a less arbitrary procedure, with a sounder sta tistical base, like those based on least squares regression, is desir able. Cc vertical consolidation test introduction replicates terzaghis. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The specimen is placed between 2 porous stone discs, with the upper one having a diameter slightly smaller than that. Consolidation test vertical consolidation test introduction apparatus and test procedure analysis of results cv mv kv c. Procedure for testing soils, 4 edition, sponsored by astm committee d18, 1964.
Scribd is the worlds largest social reading and publishing site. The data helps to determine the compression and recompression index, coefficient of consolidation and coefficient of secondary. Permeability of a soil influences the rate of its consolidation. The smaller the opening, the longer it will take for the water to flow out and dissipate its pressure. Undrained triaxial compression tests laboratory experiment. After the pore water pressure generated by the application of confining pressure is dissipated, the deviator stress. Class 7 consolidation test geotechnical engineering slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Data from several load increments is used to plot void ratio e vs. Laboratory testing of samples recovered during subsurface investigations is the most common technique to obtain values of the engineering properties necessary for design. When a compressive load is applied to soil mass, a decrease in its volume takes place, the decrease in volume of soil mass under stress is known as compression and the property of soil mass pertaining to its tendency to decrease in volume. The test is known as a one dimensional consolidation test. A laboratory testing program consists of index tests to obtain general information on.
Standard test methods for onedimensional consolidation. It is a time dependent behavior of soil deformation. Consolidation test consists of applying the pressure on a thin soil specimen in increments and keeping each pressure increment for sufficient time until the consolidation of the soil specimen and measurement of the vertical deformation of the soil specimen due to expulsion of pore water. Standard specifications direct shear testing is covered in astm standard d3080, standard method for direct shear test on soils under consolidated. Preface the purpose of this manual is to present the geotechnical test methods used by the soil mechanics laboratory of the new york state department of transportation. The ring should be clean and dried and its weight, inner diameter and height are measured using weighing balance and calipers respectively. When a saturated soil is loaded a state of stress is set up and nearly all the load is initially carried by the water in the soil pores since the water is almost incompressible. The onedimensional consolidation test ing equipment and procedures used in the bureau of reclamation laboratories are similar to those developed by casagrande. The oedometer test is classical in soil mechanics for obtaining parameters for calculation of consolidation settlements and for assessing stress history of soils.
Laboratory tests to determine shear strength of soils lecture topics o brief overview of direct shear test o determine soil shear strength parameters from triaxial tesng. Ppt consolidation test and data analysis daniel ward. The test finds two imperative parameters that are, the coefficient of consolidation, cv and the coefficient of compressibility volume, mv. The consolidation attributes of soils of low permeability can be determined with the onedimensional consolidation test. The objection of the oedometer consolidation test is to determine consolidation characteristics of soils with low permeability. Aug 01, 2019 one dimensional consolidation test soil consolidation example problems consolidation test of soil ppt oedometer consolidation test lab report consolidation test graph consolidation test. Indian institute of technology gandhinagar department of. Germaine mit spring 2004 laboratory assignment number 9 consolidation test purpose. In this test, the saturated soil specimen is first consolidated by an allaround chamber fluid pressure. The testing procedures used in the laboratory are usually varied, depending on the type of soil, the nature of the problem in the. When a compressive load is applied to soil mass, a decrease in its volume takes place, the decrease in volume of soil mass.
The consolidation test is use to estimate the amount of settlement and time of consolidation. The consolidated isotropic undrained triaxial test is the most common type of triaxial test. This test aims at determining the consolidation characteristics of low permeability soils. During the experiment, we were able to carry out an average of nine tests carried in time span of nine days. This three part series has been written to introduce one of the most versatile tests in the geotechnical laboratory the triaxial test. Rack4 abstract this paper describes the results of oedometer consolidation tests conducted in the laboratory on wholeround core samples of. Lab report oedometer technological and higher education. Consolidation test report cive334 nebraska studocu. Most of this chapter will be written with the assumption that the tests are of the fully drained type. The consolidation properties, required for calculation of the consolidation settlement, are obtained by conducting a consolidation test on a soil specimen in a geotechnical engineering laboratory. The paper gives a detailed information about the stages of oedometer test. Objective the triaxial shear test is most versatile of all the shear test testing methods for getting shear strength of soil i.
Consolidation test objective to determine the settlements due to primary consolidation of soil by conducting one dimensional test. Consolidation effects of sample disturbance oc clays figure 7. Oedometer test consolidation testing for settlement parametres. If you continue browsing the site, you agree to the use of cookies on this website. Tests are performed on specimens prepared from undisturbed samples or compacted disturbed samples undisturbed samples should be trimmed directly in the consolidation. The results of consolidation test are very much helpful in the design of foundations. This test is carried out on saturated soil specimens. The usual steps in preparing a consolidation test are as follows.
Consolidation test is used to determine the rate and magnitude of settlement in soils. The ring should be clean and dried and its weight, inner diameter and height are measured. The consolidation test is the basic experiment to measure the settlement. The data from the consolidation test are used to estimate the magnitude and rate of both differential and total settlement of a structure or earthfill.
Pdf printer driver to create file copies of your swellconsolidation reports. Unconsolidated undrained consolidated undrained o triaxial test setup and behaviour. The consolidation test is also referred to as standard oedometer test or onedimensional compression test. When a compressive load is applied to soil mass, a decrease in its volume takes place, the decrease in volume of soil mass under stress is known as compression and. Consolidation test to predict consolidation settlement in a soil, it is necessary to know its stressstrain properties i.
The test is known as a one dimensional consolidation test also known as an oedometer test. The geotechnical specialist, therefore, should recognize the projects issues ahead of time so as to optimize the testing program, particularly strength and consolidation testing. General outlines of each stage are discussed in the following based on use of a gds triaxial automated system. The consolidation software has different data recording columns each assigned to the consolidation cells and they can be.
Estimates of this type are of key importance in the design of engineered structures and the evaluation of their performance. It consists of a metal ring in which a soil specimen in the form of a disc is enclosed. Version 4 allows an entire tests worth of loading increment files to be imported at once. Oedometer consolidation test analysis by nonlinear regression abstract. This changes the consolidation characteristics of the 1d consolidation tests. The apparatus used for conducting a consolidation test is called consolidometer or odometer. A laboratory test program should be wellplanned to optimize the test data for design and construction.
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