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Effect of dry-wet cycles on dynamic properties and microstructures of sandstone:Experiments and modelling

International Journal of Mining Science and Technology 2024年第5期34卷 655-679页

作者： Hai Pu Qingyu Yi Andrey P.Jivkov Zhengfu Bian Weiqiang Chen Jiangyu Wu State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Earth Engineering China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Xinjiang Coal Resources Green Mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China Department of Solids and Structures School of EngineeringUniversity of ManchesterManchester M139PLUK School of Environment Science and Spatial Informatics China University of Mining and TechnologyXuzhou 221116China Department of Civil and Environmental Engineering Rice UniversityHouston 77005USA State Key Laboratory of High Performance Civil Engineering Materials Jiangsu Research Institute of Building Science Co.Ltd.Nanjing 210008China Department of Materials University of OxfordOxford OX13PHUK

Underground pumped storage power plant(UPSP)is an innovative concept for space recycling of abandoned *** realization requires better understanding of the dynamic performance and durability of reservoir *** paper conducted ultrasonic detection,split Hopkinson pressure bar(SHPB)impact,mercury intrusion porosimetry(MIP),and backscatter electron observation(BSE)tests to investigate the dynamical behaviour and microstructure of sandstone with cyclical dry-wet damage.A coupling FEM-DEM model was constructed for reappearing mesoscopic structure *** results show that dry-wet cycles decrease the dynamic compressive strength(DCS)with a maximum reduction of 39.40%,the elastic limit strength is reduced from 41.75 to 25.62 *** sieved fragments obtain the highest crack growth rate during the 23rd dry-wet cycle with a predictable life of 25 cycles for each rock *** pore fractal features of the macropores and micro-meso pores show great differences between the early and late cycles,which verifies the computational statistics analysis of particle *** numerical results show that the failure patterns are governed by the strain in pre-peak stage and the shear cracks are *** dry-wet cycles reduce the energy transfer efficiency and lead to the discretization of force chain and crack fields.

关键词： Underground pumped storage power plant dry-wet cycles Split Hopkinson pressure bar Macro and micro properties FEM-DEM coupling model Damage characterization

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Stability analysis of gravity anchor foundation of layered argillaceous sandstone under dry-wet cycles

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Journal of Mountain Science 2023年第4期20卷 1118-1130页

作者： ZHENG Jing-cheng CHEN Wei ZHENG Ke-ren GU Yu-peng WANG Fei HUANG Zhen LI Yun School of Civil Engineering Central South UniversityChangsha410075China The 8th Engineering Co. LTDChina Railway Major Bridge Engineering Group Co.LTD.Chongqing400026China Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang110819China College of Civil Engineering and Architecture Key Laboratory of Disaster Prevention and Structural SafetyGuangxi UniversityNanning530004China

To investigate the stability of gravity anchors of suspension bridges,in-situ tests of the vertical bearing capacity of the bedrock,shear resistance of the anchor-rock interface,shear resistance of the bedrock were conducted in a suspension bridge *** dry-wet cycles,the deterioration law of the mechanical properties of argillaceous sandstone was identified in laboratory tests:the elastic modulus,cohesion and friction of the argillaceous sandstone deteriorated significantly at first few dry-wet cycles and then declined slowly after 10 cycles,ultimately these three mechanical parameters were reduced to about 1/3,1/3,2/3 of the initial value ***,numerical simulation was used to restore in-situ shear tests and a good agreement was *** on the results of in-situ and laboratory tests,the stability of the gravity anchor foundation under natural conditions and drywet cycles was calculated and its failure modes were *** results demonstrated that the dry-wet cycles caused uneven settlement of the anchor foundation,resulting in more serious stress concentration in the *** dry-wet cycles remarkably reduced the stability coefficient of the anchor foundation,whose failure mode shifted from overturning failure under natural conditions to sliding *** there was weak interlayer in the rock layer,the anti-sliding stability of the anchor foundation was affected drastically.

关键词： Gravity anchor foundation Stability In-situ tests dry-wet cycles Numerical simulation

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Effect of dry-wet cycles on the Transport and Mechanical Properties of Cement Mortar Subjected to Sulfate Attack

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Fluid Dynamics & Materials Processing 2023年第3期19卷 679-696页

作者： Wei Chen Weijie Shan Yue Liang Frederic Skoczylas School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China CNRS Centrale LilleUMR9013-LaMcube-Laboratoire de Mécanique Multiphysique et MultiéchelleUniversitéde LilleLilleF-59000France

This study deals with the analysis of the detrimental effects of a“sulfate attack”on cement mortar for different dry-wet *** mass loss,tensile strength,and gas permeability coefficient were determined and analyzed under different exposure *** the same time,nitrogen adsorption(NAD),scanning electron microscopy(SEM),and X-ray diffraction(XRD)techniques were used to analyze the corresponding variations in the microstructure and the corrosion *** results show that certain properties of the cement mortar evolve differently according to the durations of the dry-wet cycles and that some damage is caused to the mortars in aqueous *** pores fill with corrosion products,increasing the mortar specimen mass and tensile strength while reducing the permeability coefficient and pore size *** corrosion proceeds,the crystallization pressure of the corrosion products increases,resulting in a 16%reduction in tensile strength from the initial value and a 2.6-factor increase in the permeability coefficient,indicating sensitivity to sulfate attack ***,the main corrosion products generated in the experiment are gypsum and *** of osmotic pressure and extension of the immersion time can accelerate the erosion process.

关键词： Cement mortar dry-wet cycles gas permeability tensile strength microstructure

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The Quantification of Micro-structural Damage of Weak Muddy Intercalation in dry-wet cycles Combining in-situ SEM and DIP

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Journal of Wuhan University of Technology(Materials Science) 2019年第6期34卷 1396-1399页

作者：何乐平 ZHONG Lin 胡启军 GU Yucheng ZENG Junsen TANG Wei School of Civil Engineering and Architecture Southwest Petroleum University

In order to reflect truly the damage evolution mechanism of weak muddy intercalation in dry-wet cycles, two typical weak muddy intercalations were selected for dry-wet cycles. The mineral changes of specimens were analyzed via X-ray diffraction after dry-wet cycles. By combining in-situ SEM and digital image processing(DIP), the damage evolution process and damage characteristic parameters of each stage were obtained. The experimental results indicate that the hydration and dissolution of minerals can not be a determinant factor in structure damage. The micro-structural damage is due to disintegration of mineral aggregates, leading to changes in the number and size of cracks and pores. The damage degree of specimens is related to its initial structure, and the micro-structural damage intensifies and finally tends to stabilize with cycle times increased.

关键词： dry-wet cycles weak muddy intercalation in-situ SEM digital image processing microstructural damage

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