The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
David Airey - One of the best experts on this subject based on the ideXlab platform.
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Compression Index versus Natural Water Content Relationshipsfor China’s Coastal Soft Clays
Ksce Journal of Civil Engineering, 2019Co-Authors: Zhongqing Chen, David AireyAbstract:A large number of Cc - wn (Cc is the compression index and wn is the Natural Water Content) correlations have been proposed by researchers for different soft clays around the world, but comparisons of these correlations and reasons for differences between them are rarely reported. In this paper the Cc - wn relationships of marine soft clays from eight China’s coastal cities are presented. It is found that the north coast clays have larger slope of the Cc - wn relationships (about 0.02) than the south coast clays (about 0.008). Comparisons with Cc - wn relationships for remoulded clays and structured Natural clays reported by other researchers show the importance of accounting for soil structure, and the higher compressibility and higher apparent preconsolidation stresses of the north coast clays, in comparison to the south coast clays, are believed to be associated with chemical bonding and other post-depositional changes. Most of the reported Cc - wn correlations for Natural soft clays from around the world have slopes of about 0.011, which are applicable to weakly structured clays. To develop a more widely applicable Cc - wn correlation, the effects of soil structure need to be incorporated.
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compression index versus Natural Water Content relationshipsfor china s coastal soft clays
Ksce Journal of Civil Engineering, 2019Co-Authors: Zhongqing Chen, David AireyAbstract:A large number of Cc - wn (Cc is the compression index and wn is the Natural Water Content) correlations have been proposed by researchers for different soft clays around the world, but comparisons of these correlations and reasons for differences between them are rarely reported. In this paper the Cc - wn relationships of marine soft clays from eight China’s coastal cities are presented. It is found that the north coast clays have larger slope of the Cc - wn relationships (about 0.02) than the south coast clays (about 0.008). Comparisons with Cc - wn relationships for remoulded clays and structured Natural clays reported by other researchers show the importance of accounting for soil structure, and the higher compressibility and higher apparent preconsolidation stresses of the north coast clays, in comparison to the south coast clays, are believed to be associated with chemical bonding and other post-depositional changes. Most of the reported Cc - wn correlations for Natural soft clays from around the world have slopes of about 0.011, which are applicable to weakly structured clays. To develop a more widely applicable Cc - wn correlation, the effects of soil structure need to be incorporated.
Hiroomi Nakazato - One of the best experts on this subject based on the ideXlab platform.
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estimation of pore pressure in disturbed mudstone from Natural Water Content with special reference to landslide and squeezing swelling tunnel
Soils and Foundations, 1996Co-Authors: Ryoki Nakano, Hideyoshi Shimizu, Shinichi Nishimura, Hiroomi NakazatoAbstract:ABSTRACT To elucidate the engineering significance of Natural Water Content of mudstone disturbed into clay from the view point of Critical State Soil Mechanics, CD triaxial test (with top and bottom drainage only) and CD direct shear test were carried out and the unique relationship between log qmax (or log τmax) and w and that between w and logp' (or log σv′) were obtained. Comparing the experimental results thus obtained, p' was found to be nearly equal to σv′ in fully softened shear zone. Thus, if wn at the depth of h is known, the effective confining stress p' at that depth can be known. Therefore the pore pressure acting at that depth can be calculated as u = γt ·h–p'. Two example case histories, Mizunashi landslide and Nabetachiyama tunnel in Neogene mudstone of Shiiya formation in Niigata Prefecture are presented. In the former, by measuring wn of boring core of 90 m, several number of fully softened shear zones were found to exist where artesian pressure was acting and, in the latter, in the section where tunneling was very difficult due to squeezing pressure, wn of fault clay was found to correspond either to p' induced by the overburden weight or to p' decreased by the amount of methane gas pressure.
Hyam Saleh Daoud - One of the best experts on this subject based on the ideXlab platform.
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Unconfined Compressive Strength (UCS) and Compressibility Indices Predictions from Dynamic Cone Penetrometer Index (DCP) for Cohesive Soil in Kurdistan Region/Iraq
Geotechnical and Geological Engineering, 2020Co-Authors: Younis M. Alshkane, Kamal Ahmad Rashed, Hyam Saleh DaoudAbstract:Uniaxial Compressive Strength (UCS) and compressibility indices are essential tests for calculation of bearing capacity and settlement of cohesive soil in the foundation of building construction. These tests are time-consuming and demand significant effort. Therefore, the Dynamic Cone Penetrometer Index (DCP) can be utilized as an alternative method to predict UCS and compressibility indices such as compression index (Cc) and recompression index (Cr). In this study, the DCP is used to evaluate the UCS, Cc and Cr using the simple regression analysis. One hundred test pits were conducted in thirty-five locations, 150 DCP were tested at different depths and 150 samples were collected and tested for Natural Water Content, Dry density and Consolidation. The useful empirical equation between DCP and UCS was proposed. The obtained results prove the reliability of the proposed equations and for the first time, compressibility indices (Cc and Cr) were reasonably correlated with DCP. In addition, dry density of tested samples was studied and correlated with DCP.
Manfred Blümel - One of the best experts on this subject based on the ideXlab platform.
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Experimental Study of the Brittle Behavior of Clay shale in Rapid Unconfined Compression
Rock Mechanics and Rock Engineering, 2011Co-Authors: Florian Amann, Edward Alan Button, Keith Frederick Evans, Valentin Samuel Gischig, Manfred BlümelAbstract:The mechanical behavior of clay shales is of great interest in many branches of geo-engineering, including nuclear waste disposal, underground excavations, and deep well drilling. Observations from test galleries (Mont Terri, Switzerland and Bure, France) in these materials have shown that the rock mass response near the excavation is associated with brittle failure processes combined with bedding parallel shearing. To investigate the brittle failure characteristics of the Opalinus Clay recovered from the Mont Terri Underground Research Laboratory, a series of 19 unconfined uniaxial compression tests were performed utilizing servo-controlled testing procedures. All specimens were tested at their Natural Water Content with loading approximately normal to the bedding. Acoustic emission (AE) measurements were utilized to help quantify stress levels associated with crack initiation and propagation. The unconfined compression strength of the tested specimens averaged 6.9 MPa. The crack initiation threshold occurred at approximately 30% of the rupture stress based on analyzing both the acoustic emission measurements and the stress–strain behavior. The crack damage threshold showed large variability and occurred at approximately 70% of the rupture stress.
Zhongqing Chen - One of the best experts on this subject based on the ideXlab platform.
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Compression Index versus Natural Water Content Relationshipsfor China’s Coastal Soft Clays
Ksce Journal of Civil Engineering, 2019Co-Authors: Zhongqing Chen, David AireyAbstract:A large number of Cc - wn (Cc is the compression index and wn is the Natural Water Content) correlations have been proposed by researchers for different soft clays around the world, but comparisons of these correlations and reasons for differences between them are rarely reported. In this paper the Cc - wn relationships of marine soft clays from eight China’s coastal cities are presented. It is found that the north coast clays have larger slope of the Cc - wn relationships (about 0.02) than the south coast clays (about 0.008). Comparisons with Cc - wn relationships for remoulded clays and structured Natural clays reported by other researchers show the importance of accounting for soil structure, and the higher compressibility and higher apparent preconsolidation stresses of the north coast clays, in comparison to the south coast clays, are believed to be associated with chemical bonding and other post-depositional changes. Most of the reported Cc - wn correlations for Natural soft clays from around the world have slopes of about 0.011, which are applicable to weakly structured clays. To develop a more widely applicable Cc - wn correlation, the effects of soil structure need to be incorporated.
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compression index versus Natural Water Content relationshipsfor china s coastal soft clays
Ksce Journal of Civil Engineering, 2019Co-Authors: Zhongqing Chen, David AireyAbstract:A large number of Cc - wn (Cc is the compression index and wn is the Natural Water Content) correlations have been proposed by researchers for different soft clays around the world, but comparisons of these correlations and reasons for differences between them are rarely reported. In this paper the Cc - wn relationships of marine soft clays from eight China’s coastal cities are presented. It is found that the north coast clays have larger slope of the Cc - wn relationships (about 0.02) than the south coast clays (about 0.008). Comparisons with Cc - wn relationships for remoulded clays and structured Natural clays reported by other researchers show the importance of accounting for soil structure, and the higher compressibility and higher apparent preconsolidation stresses of the north coast clays, in comparison to the south coast clays, are believed to be associated with chemical bonding and other post-depositional changes. Most of the reported Cc - wn correlations for Natural soft clays from around the world have slopes of about 0.011, which are applicable to weakly structured clays. To develop a more widely applicable Cc - wn correlation, the effects of soil structure need to be incorporated.
