The Inference of Geo-Mechanical Properties of Soft Rocks and their Degradation from Needle Penetration Tests

Aydan, Ömer; Sato, Akira; Yagi, M.

doi:10.1007/s00603-013-0477-5

Cited by 38 publications

(17 citation statements)

References 12 publications

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“…In addition, they showed that the rate of penetration had no effect on the test result, and discussed the possible uses of NP in rock engineering. Aydan et al (2008) developed a penetration test device which can also be used for medium and high strength rocks. This device utilizes a low capacity loading device and special rod-like loading platen with a flat end.…”

Section: Needle Penetrometers Used In the Studymentioning

confidence: 99%

“…This device utilizes a low capacity loading device and special rod-like loading platen with a flat end. Aydan et al (2008) also used Maruto's NP and compared the results obtained from both penetrometers and concluded that the device they developed may allow the determination of essential parameters such as UCS, tensile strength, friction angle and deformability properties from a single penetration test.…”

Section: Needle Penetrometers Used In the Studymentioning

confidence: 99%

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Evaluation of micro-structural damage caused by needle penetration testing

Ngan-Tillard

Engin

Verwaal

et al. 2012

Bull Eng Geol Environ

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The needle penetrometer (NP) is a nondestructive, cheap and simple device which can be used indirectly to obtain the uniaxial compressive strength of extremely weak rocks. It requires little sample preparation and can be used in the field and laboratory and applied in natural and man-made structures where sampling is not allowed. The microstructural damage created by the needle, its shape and size, have been assessed using four rock types (marl, mudstone and tuff from Turkey and calcarenite from the Netherlands) and two types of needle. During needle penetration, very high compressive and shear stresses are developed in advance of the needle and normal to the shaft. In all the tested rocks, densification occurred in a zone some 0.4 and 1 mm ahead of the Maruto and Eijkelkamp needles respectively. The grains are crushed and compacted in a zone which appears like an extension of the needle tip (Eijkelkamp needle). As damage is local, the NP test is said to be non-destructive. The NP results in coarse grained rocks are far more variable than in fine grained rocks. The damage caused by a needle decreases with a decrease in the diameter of the needle and an increase in the slenderness of the needle.

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Section: Needle Penetrometers Used In the Studymentioning

confidence: 99%

Section: Needle Penetrometers Used In the Studymentioning

confidence: 99%

Evaluation of micro-structural damage caused by needle penetration testing

Ngan-Tillard

Engin

Verwaal

et al. 2012

Bull Eng Geol Environ

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“…Fig. 2B shows computer tomography (CT) image of needle penetrated soapstone [16]. The drawing below the CT image is an interpretation by the author.…”

Section: Needle Penetration Mechanismmentioning

confidence: 99%

“…It has been widely used in many engineering projects in Japan, however, it is not well known in remaining parts of the world. Outside Japan, some groups, specialized in soft rocks from Turkey, Holland, Spain, and Korea [14,15,16] studied the use of this device. ISRM suggested this device for indirect determination of UCS, in 2007-2014 year book [5].…”

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confidence: 99%

Nondestructive Testing of Stabilized Soils and Soft Rocks via Needle Penetration

Dipova

2018

Period. Polytech. Civil Eng.

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“…The needle penetration test is a non-destructive index test which is applicable both in the field and laboratory and does not require any special sample preparation [1]. This test has been used for the estimation of physical and mechanical properties of weak or soft rocks [2][3][4][5][6][7][8]. However, data points in the correlation plots are highly scattered as stated by ISRM [1].…”

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confidence: 99%

The effect of clay content on the relation between uniaxial compressive strength and needle penetration index for clay-bearing rocks

Kahraman

Aloglu²,

Saygin

et al. 2021

Geo-Engineering

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The needle penetration index (NPI) test is a non-destructive test that is applicable both in the field and laboratory, and does not require any special sample preparation. This test has been used for the estimation of physico-mechanical properties of soft rocks. In this study, the influence of the clay content on the relation between uniaxial compressive strength (UCS) and the NPI has been investigated for some clay-bearing rocks. The needle penetration tests were carried out at nine different gallery faces during the Cayirhan Coal Mine excavations, and the NPI values were calculated. Claystone, clayey limestone and clay blocks were collected from the locations on which the NPI tests were performed for the determination of rock strength and clay contents. The clay contents and clay fractions of the samples were determined using XRD analysis. A strong correlation has been found between the UCS and the NPI, but some of the data points were scattered. Strong correlations were also found between the NPI and both the total clay content and the smectite content. The UCS values were also strongly correlated to the total clay content and the smectite content. A multiple regression analysis was performed to determine the influence of clay content on the UCS-NPI relation and a very strong model was derived. The correlation coefficient of the multiple regression model is fairly higher than that of the UCS-NPI relation derived by using simple regression analysis. Concluding remark is that the clay content significantly affects the UCS-NPI relation in clay-bearing rocks.

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The Inference of Geo-Mechanical Properties of Soft Rocks and their Degradation from Needle Penetration Tests

Cited by 38 publications

References 12 publications

Evaluation of micro-structural damage caused by needle penetration testing

Evaluation of micro-structural damage caused by needle penetration testing

Nondestructive Testing of Stabilized Soils and Soft Rocks via Needle Penetration

The effect of clay content on the relation between uniaxial compressive strength and needle penetration index for clay-bearing rocks

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