Utilizing water, mineralogy and sedimentary properties to predict LCPC abrasivity coefficient

Hashemnejad, Arash; Ghafoori, Mohammad; Azali, Sadegh Tarigh

doi:10.1007/s10064-015-0779-9

Cited by 34 publications

(5 citation statements)

References 9 publications

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“…In addition, it should be noted that the WAMs of the porous ignimbrites excavated in CSC projects were determined by a simple test method in the present study. However, using the LCPC test, another widely used test method to assess the abrasivity of rocks and soils, similar results to the results obtained in this study were revealed by different researchers (Barzegari et al 2015;Hashemnejad et al 2016;Abu Bakar et al 2018). These studies have generally reported that the abrasivity of rocks or soils increases, especially at a given water content value, and that extra water added later can be beneficial to reduce rock abrasivity.…”

Section: Resultssupporting

confidence: 90%

“…Another widely used test method to determine the abrasivity of rocks is LCPC (Laboratoire Central des Ponts et Chaussées), which is defined by French standards (LCPC 1990). The relationships between the abrasivity and strength parameters of the different rock groups, each generally consisting of rocks with the same origin, were also investigated using the LCPC test results (Hashemnejad et al 2016;Kahraman et al 2018). Kahraman et al (2018) statistically analyzed the effects of rock strengths on the LCPC abrasivity coefficient (LAC) for igneous rocks.…”

Section: Introductionmentioning

confidence: 99%

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Effects of changing water content of clay-content rocks on field cutter consumption rate of roadheaders: a case study of porous ignimbrites

Comakli,

Bayramov

2024

Bull Eng Geol Environ

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The changing formation characteristics during excavation can cause a higher cutter consumption rate (CCR) of mechanical excavators than theoretically estimated before the project begins. This study investigates the adhesive potential of clay-content porous ignimbrites in increasing water content and their effects on the CCR of roadheaders. For this purpose, the actual field CCR data of roadheaders were recorded for ten cold storage caverns (CSC) projects during the excavation in dry and wet conditions. Then, laboratory tests were carried out on the rock samples collected from project areas. CCRs of roadheaders were theoretically estimated based on the Cerchar abrasivity index of rocks using three different empirical models. The laboratory test results showed that increasing water content reduces the abrasivity and strength of the rocks. The theoretically estimated results also showed that CCR is to be less under saturated conditions. However, actual field data revealed higher CCRs for all CSC projects in wet conditions. Therefore, the adhesion potential of rocks in different water contents was analyzed, and positive relationships were obtained between the field CCR in wet conditions and the adhesion potentials of excavated rocks with 15%, 20%, and 25% water content. New equations were developed to estimate the CCR of roadheaders, especially in excavating rocks that have an adhesive potential to cutters, such as clay-content rocks. It has been concluded that for an accurate CCR estimation, more than theoretical calculations will be required, and changing formation conditions should also be analyzed in detail.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Effects of changing water content of clay-content rocks on field cutter consumption rate of roadheaders: a case study of porous ignimbrites

Comakli,

Bayramov

2024

Bull Eng Geol Environ

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“…In this regard, grains are classified into four groups: spherical, planar, needle-form, and blade form particles (Tucker, [24]). The shape index which proposed by Hashemnejad et al [25] as in Eq. ( 7), is the sum of length-to-width (L/W) and lengthto-thickness (L/T) ratios: Where, L, W, and T are the length, width, and thickness of each aggregate, respectively.…”

Section: Shape Index Determinationmentioning

confidence: 99%

“…Hashemnejad et al [25] proposed Eq. ( 8) to define effective (dominant) grain size for each soil: (8) Where, D 10 , D 30 , and D 60 are the diameters of grain size less than 10, 30, and 60%, respectively.…”

Section: Determination Of Effective Grain Sizementioning

confidence: 99%

Effects of Texture and Carbonate Content on Internal Friction Angle for Soils of Northern Coasts of Persian Gulf

Shahnazari¹,

Fatemiaghda²,

Karami³

et al. 2021

jeg

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The present work is conducted to investigate the effect of texture and carbonate content on internal friction angle of carbonate soils.Carbonate soils are majorly found in the bed of shallow waters and also offshores in tropical regions. Recently there is a huge construction projects including oil and gas extraction platform and facilities, harbors, refineries, huge bridges and other big construction projects in many offshore and onshore areas around the world. One of these area is located on southern part of Iran. We collected soil samples from different parts of northern coasts of Persian Gulf, then the following experiments were performed, carbonate content, threedimensional grain size, angularity, relative density & direct shear.The results showed that the average of internal friction angle of carbonate soil is higher respect to known silicate sands. This angle is affected by effective grain size, grain angularity, and calcium 114

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“…From the perspective of tribology, the soil-tool tribological system consists of the soil, cutting tool, and contact interface between them (Mostafaei et al 2019). Soil parameters (mineralogical composition (Thuro and Kasling 2009;Köhler et al 2011;Rostami et al 2012;Lohne 2013, Jakobsen et al 2013a, b), particle size distribution (Thuro et al 2007;Thuro and Kasling 2009;Drucker 2011;Köhler et al 2011;Thakare et al 2012;Woldman et al 2012;Majeed and Bakar 2019;Mosleh et al 2019), grain shape (Hamblin and Stachowiak 1996;Stachowiak 2000;Stachowiak and Stachowiak 2001;Stachowiak 2002a, b, 2004;De Pellegrin et al 2009a;Hashemnejad et al 2012;Woldman et al 2012), compactness (Jakobsen and Lohne 2013) and water content (Rostami et al 2012;Alavi Gharahbagh et al 2013, 2014aJakobsen et al 2013b;Mosleh et al 2013;Hashemnejad et al 2016;Mirmehrabi et al 2016;Bakar et al 2018), etc. ), contact interface properties (Borio et al 2007;Vinai et al 2008;Peila et al 2012;Jakobsen et al 2013b;Alavi Gharahbagh et al 2014b;Rostami et al 2017), cutting tool material (Peila et al 2012;Rostami et al 2012;Mosleh et al 2013), etc.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on cutting tool hardness optimization for shield TBMs during dense fine silty sand ground tunneling

Zhang

Tang

Liu

et al. 2021

Bull Eng Geol Environ

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The estimation of soil abrasivity and cutting tool wear during soft ground tunneling is complicated and arduous work due to the lack of a generally accepted testing system. To date, geotechnical baseline reports (GBRs) and geotechnical data reports (GDRs) still cannot provide reliable soil abrasion indices for tool life prediction. This is considered a deficiency in the geotechnical investigation of shield-driven tunnel projects. In this study, the Multifunctional Shield Test System (MSTS) developed by the Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province at Wuhan University is presented. The MSTS was motivated by the need for a test platform with the ability to simulate undisturbed soil conditions and actual tool working environments to explore the mechanism of cutting tool wear, bentonite slurry penetration, and filter cake formation in various geomaterials with grain sizes including clay, silt, sand, and gravel (< 15 mm). Experimental studies on the effect of alloy hardness on cutting tool wear are conducted. The soil samples used in the tests are dense fine silty sand from the Sutong GIL Yangtze River Crossing Cable Tunnel. When the wear extent is plotted against the alloy hardness, an inverted S-shaped band bounded by the highest and lowest alloy hardnesses is formed. The sensitive hardness interval is HRC = [47, 52]. If the alloy hardness is higher than 52 HRC, the wear extent is relatively small. Since alloy hardness is negatively correlated with bending strength, using a cutting tool material with a hardness slightly higher than the upper limit of the sensitive hardness interval is optimal. Thus, an alloy with a hardness interval of HRC = [52, 63] is recommended for the dense fine silty sand ground at the Sutong GIL Yangtze River Crossing Cable Tunnel. Keywords Cutting tool wear • Alloy hardness • Soil abrasivity • Testing system • Soft ground tunneling Terms HardnessThe ability of a material to resist hard objects pressed into its surface locally Relative hardnessThe ratio of the hardness of one material to that of another Sensitive hardness interval The hardness interval in which the wear extent decreases significantly as the hardness increases Sensitive relative hardness intervalThe relative hardness interval in which the wear extent decreases significantly as the hardness increases * Xiao-Ping Zhang

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Utilizing water, mineralogy and sedimentary properties to predict LCPC abrasivity coefficient

Cited by 34 publications

References 9 publications

Effects of changing water content of clay-content rocks on field cutter consumption rate of roadheaders: a case study of porous ignimbrites

Effects of changing water content of clay-content rocks on field cutter consumption rate of roadheaders: a case study of porous ignimbrites

Effects of Texture and Carbonate Content on Internal Friction Angle for Soils of Northern Coasts of Persian Gulf

An experimental study on cutting tool hardness optimization for shield TBMs during dense fine silty sand ground tunneling

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