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Jiao W, Zhou W, Huang Z, Lan R, Ma M. Study on static and dynamic mechanical behavior of expansive soil modified by oyster shell powder. Heliyon 2024; 10:e29699. [PMID: 38681621 PMCID: PMC11046104 DOI: 10.1016/j.heliyon.2024.e29699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 04/11/2024] [Accepted: 04/14/2024] [Indexed: 05/01/2024] Open
Abstract
To investigate the effect of oyster shell powder (OSP) on the static and dynamic properties of expansive soil, the mechanical properties of modified soil were obtained. Taking Ningming expansive soil as the research object, triaxial shear test, dynamic triaxial test and scanning electron microscope test were carried out on plain soil and 9 % expansive soil modified by oyster shell powder (ESMO). The results show that compared with plain soil, the effective cohesion of modified expansive soil with dosp < 1 mm (ESMO (dosp < 1 mm)) and dosp < 0.075 mm (ESMO (dosp < 0.075 mm)) is increased by 15.4 % and 32.8 %, respectively. Under cyclic loading, compared with plain soil, the plastic strain stability value of ESMO (dosp<0.075 mm) is reduced by 40.2 %, the pore water pressure stability value is reduced, and the stiffness is increased. The dynamic mechanical properties of ESMO (dosp<1 mm) showed the opposite trend. Through microscopic experimental analysis, the main reasons for this phenomenon are the particle size distribution, bonding form, and cementation of the two. The results can provide a theoretical basis for the practical application of ESMO and the establishment of constitutive model.
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Affiliation(s)
- Wencan Jiao
- Guangxi Xinfazhan Communication Group Co., Ltd., Nanning, 530029, China
| | - Weizheng Zhou
- School of Civil Engineering and Architecture, Guangxi University, Nanning, 530004, China
| | - Zhen Huang
- School of Civil Engineering and Architecture, Guangxi University, Nanning, 530004, China
- State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi University, Nanning, 530004, China
| | - Riyan Lan
- Guangxi Xinfazhan Communication Group Co., Ltd., Nanning, 530029, China
| | - Min Ma
- School of Civil Engineering and Architecture, Guangxi University, Nanning, 530004, China
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Ma Z, Li X, Lv L. Verification of a novel stress path method by true- triaxial test. Sci Rep 2024; 14:6110. [PMID: 38480753 DOI: 10.1038/s41598-024-56435-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 03/06/2024] [Indexed: 03/18/2024] Open
Abstract
To verify the novel method of achieving a true-triaxial stress path with the pseudo-triaxial apparatus, a series of drained and undrained tests were carried out for the identical scheme with pseudo-triaxial apparatus and true-triaxial apparatus respectively. The differences between the two types of tests were quantified. The results show that the novel method effectively achieved the true-triaxial stress path by controlling the loading ratio of the pseudo-triaxial apparatus. The relationships of q - ε1 and η - εs measured by the two apparatuses had a higher similarity which decreases slightly with the b increase. When 0 ≤ b < 0.5, the slope of the critical state line measured by both apparatuses was almost identical. When 0.5 ≤ b ≤ 1, the slope of the critical state line measured by the novel method was slightly lower, but the biggest change was within 10% compared with the two Mohr-Coulomb criteria, the peak strength measured by the two apparatuses was distributed near the criteria, indicating the feasibility and rationality of the novel method. The tests show that the novel method greatly enriches the test range of pseudo-triaxial apparatus, which not only simplifies the process of soil 3D testing but also reduces the test cost.
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Affiliation(s)
- Zhigang Ma
- School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, 750021, China
- Solid Mechanics Institute, Ningxia University, Yinchuan, 750021, China
| | - Xuefeng Li
- School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, 750021, China.
- Solid Mechanics Institute, Ningxia University, Yinchuan, 750021, China.
| | - Longlong Lv
- School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, 750021, China
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Xu W, Yin ZY, Wang HL, Wang X. Experimental study on the monotonic mechanical behavior of completely decomposed granite soil reinforced by disposable face-mask chips. J Clean Prod 2022; 352:131528. [PMID: 35400856 PMCID: PMC8983063 DOI: 10.1016/j.jclepro.2022.131528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 02/25/2022] [Accepted: 03/23/2022] [Indexed: 06/01/2023]
Abstract
In response to the global outbreak of the coronavirus pandemic (COVID-19), a staggering amount of personal protective equipment, such as disposable face masks, has been used, leading to the urgent environmental issue. This study evaluates the feasibility of mask chips for the soil reinforcement, through triaxial tests on samples mixed with complete decomposed granite (CDG) and mask chips (0%, 0.3%, 0.5%, 1%, 5% by volume). The experimental results show that adding a moderate volumetric amount of mask chips (0.3%-1%) improves the soil strength, especially under high confining pressure. The optimum volumetric content of mask chips obtained by this study is 0.5%, raising the peak shear strength up to 22.3% under the confining stress of 120 kPa. When the volumetric content of mask chips exceeds the optimum value, the peak shear strength decreases accordingly. A limited amount of mask chips also increases the elastic modulus and makes the volumetric response more dilative. By contrast, excessive mask chips create additional voids and shift the strong soil-mask contacts to weak mask-mask contacts. The laser scanning microscope (LSM) and scanning electron microscope (SEM) images on the typical samples demonstrate the microstructure of mask fibers interlocking with soil particles, highly supporting the macro-scale mechanical behavior.
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Affiliation(s)
- Wangqi Xu
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Zhen-Yu Yin
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Han-Lin Wang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Xiang Wang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
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Xiu Z, Wang S, Ji Y, Wang F, Ren F. Experimental study on the triaxial mechanical behaviors of the Cemented Paste Backfill: Effect of curing time, drainage conditions and curing temperature. J Environ Manage 2022; 301:113828. [PMID: 34583283 DOI: 10.1016/j.jenvman.2021.113828] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 08/13/2021] [Accepted: 09/22/2021] [Indexed: 06/13/2023]
Abstract
The application of CPB (Cemented Paste Backfill) can realize the clean, efficient, and safe mining of underground metal mines. Clear understanding on the triaxial mechanical properties of CPB is important to the CPB design and the stability analysis of the backfilled CPB structure. The triaxial mechanical properties of CPB can be significantly affected by the different curing conditions. In this research, triaxial compression tests of the CPB samples were carried out using the GCTS (Geotechnical Consulting & Testing System), and the considered curing conditions include different curing time (1, 3, 7 and 28 days), drainage conditions (drained and undrained) and curing temperatures (20 °C, 35 °C and 45 °C). The measured mechanical parameters were compared and analyzed against the framework of the Mohr-Coulomb criterion. Then, the vertical stress distribution of the backfilled CPB structure was calculated and discussed using the measured mechanical parameters. The results show that with the increase of the lateral constraint ratio (σc/Sd0), the elastoplastic stage of the measured deviator stress versus axial strain curve of CPB sample is gradually obvious. The peak deviator stress (Sdp) and the ultimate axial strain (εu) show the linear and negative exponential increase with the σc/Sd0 respectively. The number of cracks on the fractured surface of the CPB samples gradually decreased with the increase of σc/Sd0. The failure types of CPB samples were changed from tensile failure (σc/Sd0 = 0%) to the mixed tensile-shear failure (σc/Sd0≈10%) and compression-shear failure (σc/Sd0≥20%). Moreover, with the increase of curing time and curing temperature or under the drained curing condition, the peak deviator stress and cohesion (cb) of CPB can be significantly increased, but the corresponding internal friction angle (ϕb) is decreased. The shear mechanical parameters of CPB can significantly affect the vertical stress distribution inside the CPB structure. Therefore, when estimating the vertical stress distribution inside the backfilled CPB structure in engineering practices, it is necessary to focus on the changes of CPB shear parameters (cb and ϕb) caused by different curing conditions.
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Affiliation(s)
- Zhanguo Xiu
- School of Resources and Civil Engineering, Northeastern University, China
| | - Shuhong Wang
- School of Resources and Civil Engineering, Northeastern University, China.
| | - Yingchun Ji
- School of Science, Engineering & Environment, University of Salford, UK
| | - Feili Wang
- College of Science, Qingdao University of Technology, China.
| | - Fengyu Ren
- School of Resources and Civil Engineering, Northeastern University, China
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Anagnostopoulos CA, Chrysanidis T, Anagnostopoulou M. Experimental data of cement grouting in coarse soils with different superplasticisers. Data Brief 2020; 30:105612. [PMID: 32382618 PMCID: PMC7200773 DOI: 10.1016/j.dib.2020.105612] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Revised: 04/15/2020] [Accepted: 04/17/2020] [Indexed: 12/01/2022] Open
Abstract
High-range water reducers, such as superplasticisers, can be potentially viable for cement grouting applications. In this study, we investigate the influence of two types of superplasticisers—one based on polycarboxylate ether and another based on naphthalene condensates—on the injectability of thick cement grouts into coarse soil and on the shear strength parameters of the grouted soil. Injectability tests were performed on soil columns with various superplasticiser dosages and grouts prepared with different water-to-cement ratios over a wide range of grouting pressures. The shear strength parameters of the grouted soil were evaluated through undrained unconsolidated triaxial compression tests.
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Affiliation(s)
- Costas A Anagnostopoulos
- Department of Environmental Engineering, International Hellenic University, 57400 Sindos, Thessaloniki, Greece
| | - Theodoros Chrysanidis
- Department of Environmental Engineering, International Hellenic University, 57400 Sindos, Thessaloniki, Greece
| | - Maria Anagnostopoulou
- Department of Environmental Engineering, International Hellenic University, 57400 Sindos, Thessaloniki, Greece
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Le NH, Abriak NE, Binetruy C, Benzerzour M, Nguyen ST. Mechanical behavior of municipal solid waste incinerator bottom ash: Results from triaxial tests. Waste Manag 2017; 65:37-46. [PMID: 28392120 DOI: 10.1016/j.wasman.2017.03.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 01/18/2017] [Accepted: 03/27/2017] [Indexed: 06/07/2023]
Abstract
Bottom ash resulting from the incineration of various domestic wastes can be viewed as a typical granular material. It is mainly used in civil engineering as a substitute for traditional natural aggregates. The purpose of this paper is to characterize their mechanical behavior and evaluate their mechanical properties for engineering applications. First, results of triaxial tests confirm that bottom ash behaves like dense sand. Second, the deformation and strength characteristics of bottom ash, such as the secant modulus, Poisson ratio, characteristic angle, dilation angle, effective cohesion and effective friction angle, are determined. It is found that these mechanical parameters are in close agreement with those of road aggregates and are influenced by the effective confining pressure. Third, the evolution of the deformation modulus according to the axial strain and the variation of the deviator stress according to the mean effective pressure are analyzed. Finally, a set of points of the yielding state is determined from triaxial tests to represent the shape of the yielding surface of bottom ash.
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Affiliation(s)
- Ngoc Hung Le
- University of Transport and Communications, Research and Application Center for Technology in Civil Engineering, Ha Noi, Viet Nam; Université Lille Nord, France; Ecole Nationale Supérieure des Mines de Douai, LGCgE-MPE-GCE, Douai, France.
| | - Nor Edine Abriak
- Université Lille Nord, France; Ecole Nationale Supérieure des Mines de Douai, LGCgE-MPE-GCE, Douai, France.
| | - Christophe Binetruy
- Research Institute in Civil Engineering and Mechanics, UMR CNRS 6183, Ecole Centrale de Nantes, 1 Rue de la Noe, 44321 Nantes, France.
| | - Mahfoud Benzerzour
- Université Lille Nord, France; Ecole Nationale Supérieure des Mines de Douai, LGCgE-MPE-GCE, Douai, France.
| | - Sy-Tuan Nguyen
- Duy Tan University, Institute of Research and Development, 03 Quang Trung, Danang, Viet Nam.
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