ISRM Suggested Method for the Needle Penetration Test

Ulusay, Reşat; Aydan, Ömer; Ergüler, Zeynal Abiddin; Ngan-Tillard, D.J.M.; Seiki, Takafumi; Verwaal, W.; Sasaki, Yasuhito; Sato, Akira

doi:10.1007/s00603-013-0534-0

Cited by 49 publications

(19 citation statements)

References 7 publications

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“…4) kg/cm 2 kg/mm Rocks and soilcrete Yamaguchi et al (1997) log UCS = 0.982 • log NPI − 0.209 (R = 0.872) (Eq. 5) kg/cm 2 kg/cm Pyroclastic rocks Takahashi et al (1998 Changes in the NPI produced by water content remains under-researched, with just a few papers published on this subject (Aydan, 2012;Ulusay et al, 2014). Those works, which studied the relationship between saturation and the NPI for Japanese, Turkish and Egyptian soft rocks, concluded that the NPI decreases as rock water content increases, as also do UCS and Est.…”

Section: Measurement Units Rock Types Ucs Ormentioning

confidence: 99%

“…1). To carry out the NPT according to the ISRM-suggested method (Ulusay et al, 2014), from each block, four cylindrical core specimens, 52 mm in diameter and 50-55 mm in length, were drilled perpendicular to bedding using a diamond drill rig. Additionally, to carry out the PLT, drilled from each block was a minimum of sixteen cylindrical core specimens, 28 mm in diameter and 70-75 mm in length.…”

Section: Rock Block Collection and Specimen Preparationmentioning

confidence: 99%

“…The NPT, using the device developed by Maruto Co. (2006), was performed five times for each specimen surface, under the premise that each penetration point was at least 10 mm from any other point, according to the ISRM (Ulusay et al, 2014) (Fig. 2).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…As for the Schmidt hammer test, this can be used to estimate the UCS in field geotechnical surveys but has two drawbacks, namely, that it is not suitable for rocks with UCS values lower than 10 MPa (Ulusay and Erguler, 2012) and it cannot be applied in a non-destructive manner in soft rocks, given that high-energy impacts can cause microcracking, grain crushing and pore collapse in friable, porous or weathered rock specimens (Aydin, 2009). Those tests, therefore, are not suitable for in situ non-destructive tests to determine mechanical properties in natural soft rock structures, monuments or heritage or ancient constructions built with natural stone (Ulusay et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…In this connection, NPT could be also used for the determination of the specific energy of cutting or for the indirect determination of strength parameters of soft rocks, such as the UCS. This approach, especially suitable for testing specimens with UCS values lower than 20 MPa, has three major advantages: NPT can be used in the field or laboratory, the specimens do not require any special preparation, and it is non-destructive (Ulusay et al, 2014). The NPI has been mostly used to calculate the UCS of sedimentary soft rocks (like marls, shales, sandstones and argillaceous rocks) in a dry state in laboratory tests or with their natural water content in field surveys.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Strength and Deformability of Soft Sedimentary Rocks in Dry and Saturated Conditions Through Needle Penetration and Point Load Tests: A Comparative Study

et al. 2020

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The preparation of standardized soft rock specimens to perform unconfined compressive strength (UCS) tests is typically difficult, expensive and time-consuming. Needle Penetration Test (NPT) was originally developed in Japan as an alternative for the indirect estimation of UCS of soft rocks. The needle penetrometer is a simple, portable and non-destructive testing device that measures applied load and penetration depth for the rock to calculate the needle penetration index (NPI). A complimentary, portable and widely used destructive test is the point load test (PLT), which measures regular and irregular specimens by the application of a concentrated load using two coaxial conical platens that yield the point load strength index (IS(50)). We investigated and compared the NPT and PLT in terms of measuring changes induced by water saturation and obtaining UCS and the static Young's modulus (Est) for dry and saturated soft sedimentary rocks. The results point to significant correlation functions from which to infer UCS and Est in terms of NPI and IS(50) in dry and saturated soft rocks. Furthermore, both NPT and PLT are suitable tests for evaluating changes in strength and deformability induced by water saturation. We also found a good correlation between the NPI and Is(50) .

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Section: Measurement Units Rock Types Ucs Ormentioning

confidence: 99%

Section: Rock Block Collection and Specimen Preparationmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Strength and Deformability of Soft Sedimentary Rocks in Dry and Saturated Conditions Through Needle Penetration and Point Load Tests: A Comparative Study

et al. 2020

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Erfahrungen zur Festigkeitsbestimmung von Mergelgesteinen mit dem Nadelpenetrometer

Aderhold

Alber²,

Plinninger³

2023

Geotechnik

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Die zutreffende Beurteilung der einaxialen Druckfestigkeit stellt eine der Kernaufgaben der Geotechnik im Kontext der Planung und Ausführung von Tief‐, Tunnel‐ und Spezialtiefbauarbeiten dar. Für viele geringfeste und veränderlich feste Gesteine, z. B. Tonsteine, Mergelsteine, Tuffe, oder stärker verwitterte Gesteine ist allerdings die Probengewinnung, der Erhalt des natürlichen Wassergehalts, die Probenpräparation und schließlich die Prüfung mit herkömmlichen Laborversuchsverfahren wie dem einaxialen Druckversuch herausfordernd, wenn nicht gar unmöglich. Bereits 1980 wurde in Japan das Nadelpenetrometer als feldtaugliches Prüfverfahren zur Abschätzung der einaxialen Druckfestigkeit derartiger Gesteine entwickelt. Obwohl das Verfahren in einer 2014 veröffentlichten ISRM Suggested Method verankert ist, ist der Einsatz des Nadelpenetrometers und der damit ermittelte Nadelpenetrometerindex (NPI) in Deutschland und Mitteleuropa im Fels eher unüblich. Dass das Verfahren sinnvoll und gewinnbringend einsetzbar ist, soll anhand umfangreicher Messdaten erläutert werden, die bei der Begleitung eines anspruchsvollen Spezialtiefbauprojekts in verschiedenen Mergelgesteinen der Münsterländer Kreidebucht erhoben wurden. Ausgehend von diesen Erfahrungen stellt der Beitrag eine Analyse des potenziellen Anwendungsbereichs vor und diskutiert die Ableitung von Schätzwerten der einaxialen Druckfestigkeit.

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Study on Needle Penetration Test for Estimating Mechanical Parameters of Sandy Dolomite

Dong,

Zhou,

Wang

et al. 2024

Environmental Science and Engineering

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ISRM Suggested Method for the Needle Penetration Test

Cited by 49 publications

References 7 publications

Evaluation of Strength and Deformability of Soft Sedimentary Rocks in Dry and Saturated Conditions Through Needle Penetration and Point Load Tests: A Comparative Study

Evaluation of Strength and Deformability of Soft Sedimentary Rocks in Dry and Saturated Conditions Through Needle Penetration and Point Load Tests: A Comparative Study

Erfahrungen zur Festigkeitsbestimmung von Mergelgesteinen mit dem Nadelpenetrometer

Study on Needle Penetration Test for Estimating Mechanical Parameters of Sandy Dolomite

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