Hspit, crosshole sonic logging csl, single hole sonic logging ssl. When both test methods are used in conjunction, certain characteristics of a. Pdf the crosshole sonic logging measurement to measure the. Pdf crosshole sonic logging of secant pile walls a feasibilty study. Crosshole, csl, astm d 676002, nf p 941601, jgj 1062003 abstract. Individually, each test method has its own advantages and weaknesses inherent in the test method. Crosshole sonic logging csl is a method to verify the structural integrity of drilled shafts and other concrete piles the csl method is considered to be more accurate than sonic echo testing in the determination of structural soundness of concrete within the drilled shaft inside of the rebar cage. Deep foundations by ultrasonic crosshole testing astm. The test results can be used for evaluation of the pile crosssectional area and length, the pile integrity and continuity, as well as consistency of the pile material. Critical comparison of ultrasonic pile testing standards. Towards intelligent interpretation of low strain pile integrity testing. Standard test method for integrity testing of concrete. Additional plots and analyses can be included as required or suggested by the testing engineer. The crosshole analyzer determines the quality and consistency of the concrete of drilled shafts, slurry walls, bored piles, castinsitu piles and other types of concrete foundations.
The pitw software postprocesses the data and generates reports, while the pit. This paper proposes a probabilistic analysis procedure for evaluating the reliability of csl. These advantages and weaknesses are discussed in this paper. Reliability evaluation of crosshole sonic logging for bored pile.
Such waves travel not only in air and water, but also in solids, where they are also called stress waves or elastic waves. Deep foundations integrity testing mostly applies to foundations constructed onsite from concrete or grout, such as drilled shafts, drilled mini piles, pressure. Astm d6760 08 standard test method for integrity testing of concrete. This method provides little indication of concrete soundness outside the cage. In this test method, all the above will be designated deep foundation elements. Standard test method for integrity testing of concrete deep foundations by ultrasonic cross hole testing. The pit test consists of attaching one or two accelerometers to the foundation and using a handheld hammer to impact it. D676016 standard test method for integrity testing of concrete deep foundations by ultrasonic crosshole testing ultrasonic cross hole test augercast piles bored piles diaphragm walls ultrasonic probes dams drilled shaft. In case defects are detected, additional tests or analysis options may include csl tomography, gammagamma nuclear density logging, sonic echo or impact response tests, high strain dynamic pile testing, static load testing, or concrete coring. Comparing crosshole sonic logging and lowstrain integrity testing. Comparing crosshole sonic logging and lowstrain integrity testing results white, b. Low strain pile integrity testing lspit, due to its simplicity and low. Critical comparison of ultrasonic pile testing standards joram m. Astm d6760 16 standard test method for integrity testing.
Pile integrity test applications and limitations youtube. Table of contents specializing in pile integrity test. The test can also be used to estimate the unknown length of existing piles and foundations. Contemporary topics in deep foundation, asce gsp 185, orlando. Examination of a new crosshole sonic logging system for. This method can also be extended to diaphragm walls, barrettes, dams etc. Pile integrity test pit, or as astm d5882 refers to it as low strain impact integrity test, is a common nondestructive test method for the evaluation of pile integrity andor pile length.
Pdis crosshole analyzer champ q is ideal for testing four probes six profiles in just one pull, saving time and money. Crosshole sonic logging csl is a common testing methods for determining the integrity of inplace constructed deep foundation elements, such as drilled shafts and caissons. A minor variation of this method, called singlehole sonic logging ssl can also be used on smaller diameter drilled minipiles and augercast piles. We shall therefore begin with a short introduction to the propagation of stress waves in solids. In order to fully evaluate shaft integrity using low strain integrity testing results, a clear toe re. Pdf the crosshole sonic logging csl measurement system to. For each pile tested, the averaged, amplified velocity versus time record shall be included in the report, with a table summarizing results and conclusions. Evaluation of pile integrity using cross hole sonic logging testing. Crosshole sonic logging csl, also known as cross sonic logging or the sonic logging test is the most accurate and reliable technique for assessing the integrity of deep foundation elements such as newly placed concrete drilled shafts and slurry walls, particularly when drilling below groundwater level. Pit pile integrity tester for low strain testing pile. Among the most common methods of ndt testing are cross hole sonic logging and lowstrain integrity testing. Cross hole sonic logging csl was performed in 100% of the piles. Castinplace cip concrete piles are often chosen as a deep foundation alternative where challenging soil conditions exist andor where vibrations from pile. This method has been used to test the integrity of bored piles worldwide.
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