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Discussion on“Dispersion characteristics of clayey soils containing waste rubber particles”[J Rock Mech Geotech Eng 15(2023)3050e3058]

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第9期16卷 3864-3865页

作者： Prithvendra singh devendra narain singh Pintu Kumar Saw Department of Civil Engineering Indian Institute of Technology BombayMumbai400076India

We read with great interest the recent article by Erenson(2023)entitled“Dispersion characteristics of clayey soils containing waste rubber particles”.The author has studied the dispersion characteristics of clayey soils containing different percentages of waste rubber particles(WRPs)by performing several tests(*** limit,linear shrinkage limit,double hydrometer,crumb test and pinhole test)and scanning electron microscopy(SEM)analysis on five clayey(***-activated bentonite,refined ball clay,Ukrainian kaolin,Avanos kaolin and Afyon clay)samples containing 0%,5%,10%and 15%*** should be noted that Erenson(2023)has presented some interesting observations,but there are some serious issues that we want to share through this discussion and request the author of the original paper to address them to avoid their persistence in the scientific literature.

关键词： Waste rubber particles Dispersion characteristics Clay Bentonite Scientific literature Discussion

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Establishing two-stage interaction between fly ash and NaOH by X-ray and infrared analyses

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Frontiers of Environmental Science & Engineering 2015年第2期9卷 216-221页

作者： Bhagwanjee JHA Nevin KOSHY devendra narain singh Civil Engineering Department Indian Institute of Technology Bombay Mumbai 400076 India

The interaction of the fly ash and NaOH, in an open reflux hydrothermal system at 100℃, has been explored by several researchers and formation of fly ash zeolites has been confirmed based on the X-ray diffraction analysis of the residues. However, this method does not reveal much about the characteristic transitions （viz. elemental, electro-negativity and cation exchange capa- city） of the residues. In this situation, resorting to Fourier transform-infrared radiation （FT-IR） spectroscopy on the residues obtained from two-stage hydrothermal treatment process, described in this manuscript, appears to be a novel idea to establish transitions in chemical bonds （viz., -Si- OH-AI-, OH-Na, OH-A1-）, crystallinity and cation exchange capacity of these residues. Based on extensive studies, it has been demonstrated that FT-IR spectroscopy is extremely useful for 1） detection of chemical bonds in the residues, 2） evaluation of zeolites in the residues and 3） also establishing the superiority of the two-stage interac- tion of the fly ash with NaOH for synthesizing better fly ash zeolites （viz., Na-P1 and Hydroxysodalte） as compared to those obtained from the conventional single-stage treatment of the fly ash.

关键词： hydrothermal treatment alkali activation flyash zeolites X-ray diffraction (XRD) and Fourier transform-infrared radiation (FT-IR) spectroscopy

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Effect of sample size on the fluid flow through a single fractured granitoid

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第3期8卷 329-340页

作者： Kunal Kumar singh devendra narain singh Ranjith Pathegama Gamage Geohazards and Engineering Geology Division Geological Survey of India Bandlaguda Hyderabad 500068 India Geotechnical Engineering Division Department of Civil Engineering Indian Institute of Technology Bombay Powai Mumbai 400076 India Department of Civil Engineering Monash University Clayton Melbourne Vic 3800 Australia

Most of deep geological engineered structures, such as rock caverns, nuclear waste disposal repositories, metro rail tunnels, multi-layer underground parking, are constructed within hard crystalline rocks because of their high quality and low matrix permeability. In such rocks, fluid flows mainly through fractures. Quantification of fractures along with the behavior of the fluid flow through them, at different scales, becomes quite important. Earlier studies have revealed the influence of sample size on the confining stress-permeability relationship and it has been demonstrated that permeability of the fractured rock mass decreases with an increase in sample size. However, most of the researchers have employed numerical simulations to model fluid flow through the fractureJfracture network, or laboratory investigations on intact rock samples with diameter ranging between 38 mm and 45 cm and the diameter-to-length ratio of 1：2 using different experimental methods. Also, the confining stress, 03, has been considered to be less than 30 MPa and the effect of fracture roughness has been ignored. In the present study, an extension of the previous studies on ＂laboratory simulation of flow through single fractured granite＂ was conducted, in which consistent fluid flow experiments were performed on cylindrical samples of granitoids of two different sizes （38 mm and 54 mm in diameters）, containing a ＂rough walled single fracture＂. These experiments were performed under varied confining pressure （03 - 5-40 MPa）, fluid pressure （fp ≤ 25 MPa）, and fracture roughness. The results indicate that a nonlinear relationship exists between the discharge, Q, and the effective confining pressure, σeff., and Q decreases with an increase in σeff.. Also, the effects of sample size and fracture roughness do not persist when O＇eff. ≥ 20 MPa. It is expected that such a study will be quite useful in correlating and extrapolating the laboratory scale investigations to in-situ scale and further imp

关键词： Rock massSingle fractureFluid flowSample sizeSize effectFracture roughness

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