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Sustainability of lime stabilized road subgrade in mountainous regions of Türkiye

Journal of Mountain Science 2023年第8期20卷 2436-2452页

作者： Yavuz ABUT İlknur BOZBEY Ece KURT BAL Department of Transportation Engineering Faculty of EngineeringYalova UniversityYalova 77200Türkiye geotechnical Engineering division Civil Engineering DepartmentAvcilar CampusIstanbul University-CerrahpasaAvcilar/Istanbul 34320Türkiye Civil Eng. M.Sc.&Geoph.Eng.Sentez Geopier FoundationsIstanbul 34320Türkiye

In this paper the use of lime stabilized subgrade for low volume roads in two regions with high mountains and different frost penetration conditions in Türkiye was investigated in terms of design,performance,and *** on unstabilized and stabilized subgrade were designed for two regions(Izmir and Van),covering all climate *** resilient modulus of the lime stabilized subgrade with different soil pulverization levels for non-freezing and freezing conditions were taken from a previous laboratory *** effects were considered in pavement design using two different approaches,including limited subgrade frost penetration method and reduced subgrade strength *** application and evaluation were performed for all *** stabilized subgrades significantly reduced the thickness of base courses,and the benefit of lime stabilization was highly dependent on soil pulverization level.A detailed cost analysis on the unstabilized and stabilized cases found that the use of lime stabilization in the subgrade provided significant initial cost *** analysis by using the AASHTO(1993)method and KENPAVE software,and quantity effect of soil pulverization level on the performance of low volume roads from a service life perspective,show that subgrade resilient modulus can be *** is also possible to make correct performance estimation in the *** results of the study show that lime stabilization is a good solution for low volume roads in the mountainous regions of Türkiye.

关键词： Aggregate Surfaced Roads Lime Stabilization Soil Pulverization Levels Road Design Service Life Cost analyses

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Dynamic earth pressure on rigid retaining walls induced by a neighboring machine foundation,by the meshless local Petrov-Galerkin method

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Earthquake Engineering and Engineering Vibration 2015年第4期14卷 647-661页

作者： Mehdi Veiskarami Arash Bahar Erfan Zandi Lak geotechnical Engineering division Department of Civil EngineeringUniversity of Guilan Department of Civil and Environmental Engineering School of Engineering No.1Shiraz University Structural Engineering division Department of Civil EngineeringUniversity of Guilan

Dynamic earth pressure induced by machine foundations on a neighboring retaining wall is analyzed with emphasis on factors which control the intensity and location of the design forces. The meshless local Petrov-Galerkin (MLPG) method is used to analyze the problem for a variety of retaining wall and machine foundation geometries. The soil medium is assumed to be homogeneous and visco-elastic. The machine foundation is idealized as a harmonic sinusoidal dynamic force often encountered in practice. A number of analyses have been made to reveal the effect of the loading frequency, the location and size of the foundation and the soil shear wave velocity on the distribution and magnitude of the dynamic earth pressure. Results indicate that there is a critical frequency and a critical location for which the passive pressure takes the maxima in the entire duration of the dynamic load.

关键词： MLPG retaining wall dynamic loading visco-elastic soil machine foundation

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Rotating magnetic field inhibits Aβ protein aggregation and alleviates cognitive impairment in Alzheimer’s disease mice

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Zoological Research 2024年第4期45卷 924-936页

作者： Ruo-Wen Guo Wen-Jing Xie Biao Yu Chao Song Xin-Miao Ji Xin-Yu Wang Mei Zhang Xin Zhang High Magnetic Field Laboratory CAS Key Laboratory of High Magnetic Field and Ion Beam Physical BiologyHefei Institutes of Physical ScienceChinese Academy of SciencesHefeiAnhui 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefeiAnhui 230036China Institutes of Physical Science and Information Technology Anhui UniversityHefeiAnhui 230601China School of Life Sciences Division of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui 230026China

Amyloid beta(Aβ)monomers aggregate to form fibrils and amyloid plaques,which are critical mechanisms in the pathogenesis of Alzheimer’s disease(AD).Given the important role of Aβ1-42 aggregation in plaque formation,leading to brain lesions and cognitive impairment,numerous studies have aimed to reduce Aβaggregation and slow AD *** diphenylalanine(FF)sequence is critical for amyloid aggregation,and magnetic fields can affect peptide alignment due to the diamagnetic anisotropy of aromatic *** this study,we examined the effects of a moderate-intensity rotating magnetic field(RMF)on Aβaggregation and AD *** indicated that the RMF directly inhibited Aβamyloid fibril formation and reduced Aβ-induced cytotoxicity in neural cells in *** the AD mouse model APP/PS1,RMF restored motor abilities to healthy control levels and significantly alleviated cognitive impairments,including exploration and spatial and non-spatial memory *** examinations demonstrated that RMF reduced amyloid plaque accumulation,attenuated microglial activation,and reduced oxidative stress in the APP/PS1 mouse *** findings suggest that RMF holds considerable potential as a non-invasive,high-penetration physical approach for AD treatment.

关键词： lzheimer’s disease Rotating magnetic field Amyloid-β Cognitive function Alzheimer’s disease animal models

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Evaluation of the impact of commodity price change on mine plan of underground mining

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International Journal of Mining Science and Technology 2015年第3期25卷 375-382页

作者： Salama Abubakary Nehring Micah Greberg Jenny division of Mining and geotechnical Engineering Department of CivilMining and Environmental EngineeringLulea University of Technology School of Mechanical and Mining Engineering The University of Queensland

Fluctuations in commodity prices should influence mining operations to continually update and adjust their mine plans in order to capture additional value under new market conditions. One of the adjustments is the change in production sequencing. This paper seeks to present a method for quantifying the net present value(NPV) that may be directly attributed to the change in commodity prices. The evaluation is conducted across ten copper price scenarios. Discrete event simulation combined with mixed integer programming was used to attain a viable production strategy and to generate optimal mine plans. The analysis indicates that an increase in prices results in an increased in the NPV from$96.57M to $755.65M. In an environment where mining operations must be striving to gain as much value as possible from the rights to exploit a finite resource, it is not appropriate to keep operating under the same mine plan if commodity prices alter during the course of operations.

关键词： Mine planning Underground mining Commodity price Discrete event simulation Mixed integer programming

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Compressive fatigue behavior and failure evolution of additive fiber-reinforced cemented tailings composites

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International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 345-355页

作者： Jiajian Li Shuai Cao Erol Yilmaz Yunpeng Liu School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education University of Science and Technology BeijingBeijing 100083China Department of Civil Engineering Geotechnical DivisionRecep Tayyip Erdogan UniversityFenerRize TR53100Turkey State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology) Wuhan 430070China

The ordinary cemented tailings backfill(CTB)is a cement-based composite prepared from tailings,cementitious materials,and *** this study,a series of laboratory tests,including uniaxial compression,digital image correlation measurement,and scanning electron microscope characteristics of fiber-reinforced CTB(FRCTB),was conducted to obtain the uniaxial compressive strength(UCS),failure evolution,and microstructural characteristics of FRCTB *** results show that adding fibers could increase the UCS values of the CTB by 6.90%to 32.76%.The UCS value of the FRCTB increased with the increase in the polypropylene(PP)fiber ***,the reinforcement effect of PP fiber on the CTB was better than that of glass *** addition of fiber could increase the peak strain of the FRCTB by0.39%to 1.45%.The peak strain of the FRCTB increased with the increase in glass fiber *** failure pattern of the FRCTB was coupled with tensile and shear *** addition of fiber effectively inhibited the propagation of cracks,and the bridging effect of cracks by the fiber effectively improved the mechanical properties of the *** findings in this study can provide a basis for the backfilling design and optimization of mine backfilling methods.

关键词： cemented tailings backfill uniaxial compressive strength combined fiber reinforcement digital image correlation microstructural characteristics

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Performance analysis of empirical models for predicting rock mass deformation modulus using regression and Bayesian methods

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Journal of Rock Mechanics and geotechnical Engineering 2020年第6期12卷 1263-1271页

作者： Adeyemi Emman Aladejare Musa Adebayo Idris Oulu Mining School University of OuluOuluFinland division of Mining and geotechnical Engineering Department of CivilEnvironmental and Natural Resources EngineeringLuleåUniversity of TechnologyLuleåSweden

Deformation modulus of rock mass is one of the input parameters to most rock engineering designs and *** field tests for determination of deformation modulus are cumbersome,expensive and *** has prompted the development of various regression equations to estimate deformation modulus from results of rock mass classifications,with rock mass rating(RMR)being one of the frequently used *** regression equations are of different types ranging from linear to nonlinear functions like power and *** method has recently been developed to incorporate regression equations into a Bayesian framework to provide better estimates of geotechnical *** question of whether Bayesian method improves the estimation of geotechnical properties in all circumstances remains ***,a comparative study was conducted to assess the performances of regression and Bayesian methods when they are used to characterize deformation modulus from the same set of RMR data obtained from two project *** study also investigated the performance of different types of regression equations in estimation of the deformation ***,probability distributions and prediction indicators were used to assess the performances of regression and Bayesian methods and different types of regression *** was found that power and exponential types of regression equations provide a better estimate than linear regression *** addition,it was discovered that the ability of the Bayesian method to provide better estimates of deformation modulus than regression method depends on the quality and quantity of input data as well as the type of the regression equation.

关键词： Deformation modulus Rock mass Regression equation Bayesian method Performance analysis Rock mass rating(RMR)

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Science as the Basis for Public Health Decisions in Nutrition and Food Safety in Asia

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Biomedical and Environmental Sciences 2001年第1期14卷 1-13页

作者： KRAISID TONTISIRIN RENATA CLARKE director Food and Nutrition DivisionNutrition OfficerFood Quality and Consumer Protection GroupFood and Nutrition DivisionFood and Agriculture Organization of the United NationsRomeItaly

INTRODUCTION　　Worldwide, great advances have been made in public health protection over the last decades. Perhaps this is most cogently illustrated by the improvements in life expectancy that have been achieved in countries throughout the world. Globally　, the average life expectancy at birth from 1950 to 1955 was 46.1 years.［1］ Forty years later, this statistic increased to 64.3 years. Although this global average masks important differences between less and more developed countries, for all countries at all stages of development, substantial increases in life expectancy at birth have been realised. In Asia, the average life expectancy increased from 56.3 years to 64.5 years in the two decades between 1975 and 1995. While there remains much to be done to further improve public health and well-being of the people, the achievements are undeniable.

关键词： Science as the Basis for Public Health Decisions in Nutrition and Food Safety in Asia

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Shallow landslide susceptibility assessment under future climate and land cover changes: A case study from southwest China

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Geoscience Frontiers 2023年第4期14卷 21-41页

作者： Zizheng Guo Joaquin Vicente Ferrer Marcel Hürlimann Vicente Medina Carol Puig-Polo Kunlong Yin Da Huang School of Civil and Transportation Engineering Hebei University of Technology300401 TianjinChina division of geotechnical Engineering and Geosciences Department of Civil and Environmental EngineeringUPC BarcelonaTECH08034 BarcelonaSpain Faculty of Engineering China University of Geosciences430074 WuhanChina Institute of Environmental Science and Geography University of Potsdam14476 PotsdamGermany Potsdam Institute for Climate Impact Research 14473 PotsdamGermany College of Geological Engineering and Geomatics Chang’an University710064 Xi’anChina

There is no doubt that land cover and climate changes have consequences on landslide activity,but it is still an open issue to assess and quantify their *** County in southwest China was selected as the test area to study rainfall-induced shallow landslide susceptibility under the future changes of land use and land cover(LULC)and *** used a high-resolution meteorological precipitation dataset and frequency distribution model to analyse the present extreme and antecedent rainfall conditions related to landslide *** future climate change factors were obtained from a 4-member multimodel ensemble that was derived from statistically downscaled regional climate *** future LULC maps were simulated by the land change modeller(LCM)integrated into IDRISI Selva software.A total of six scenarios were defined by considering the rainfall(antecedent conditions and extreme events)and LULC changes towards two time periods(mid and late XXI century).A physically-based model was used to assess landslide susceptibility under these different *** results showed that the magnitude of both antecedent effective recharge and event rainfall in the region will evidently increase in the *** the scenario with a return period of 100 years,the antecedent rainfall in summer will increase by up to 63%whereas the event rainfall will increase by up to 54%for the late 21st *** most considerable changes of LULC will be the increase of forest cover and the decrease of farming *** magnitude of this change can reach+22.1%(forest)and–9.2%(farmland)from 2010 until 2100,*** found that the negative impact of climate change on landslide susceptibility is greater than the stabilizing effect of LULC change,leading to an over decrease in stability over the study *** is one of the first studies across Asia to assess and quantify changes of regional landslide susceptibility under scenarios driven by LULC and climate ***

关键词： Rainfall-induced landslide Susceptibility Climate change Land cover change China

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Effect of vacuum degree and aeration rate on sludge dewatering behavior with the aeration-vacuum method

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第9期11卷 638-655页

作者： Yu-feng GAO Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Nanjing 210098 China geotechnical Research Institute Hohai University Nanjing 210098 China The Science and Technology division Hohai University Nanjing 210098 China

Due to large-scale dredging operations, a large amount of sludge is inevitably produced. Large areas of land are occupied when the dredged sludge is discarded in the disposal site as waste material. The sludge dewatering with aeration-vacuum (SDAV) method is suit for treating the sludge with high water content and high clay content in the disposal site. The water in the sludge can be discharged out. The volume of the sludge can be reduced quickly, and the recycling of the land can be accelerated by this method. Most importantly, this technique is an efficient way to deal with clogging problems when pumping water from high water content, high clay content dredged sludge. Vacuum degree range tests, the aeration rate range tests, and the influencing factors of sludge dewatering behavior tests were conducted with a self-developed SDAV model test device. Sludge samples were taken from the South-to-North Water Diversion East Line Project in Huai’an White-Horse Lake disposal site, Jiangsu Province, China. The optimal range of vacuum degree and aeration rate were obtained through the test results, and the mechanisms for how the two factors work and how they affect the sludge dewatering behavior were analyzed. The suitable vacuum degree range in SDAV is below 50 kPa, and the suitable aeration rate is about 1.0 m3/h. The low-vacuum degree contributes to reduce the ad-sorption effect of micro-channels on soil particles in filter material and to maintain the arch structures. Aeration has the effects of expansion, disturbance, changing Reynolds number, and dynamic sieve separating. The pump quantity of water per meter of filter tube (m) has different change rules as the vacuum degree changes under different aeration rates. The reason is that the formed arch structures’ conformation and permeability differ greatly under different combined-conditions of vacuum degree and aeration rate. The optimal combined-condition for dewatering the sludge is 35 kPa with 1.0 m3/h.

关键词： High water content dredged sludge Sludge dewatering with aeration-vacuum (SDAV) Vacuum degree Aeration rate Arch structures

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Stone column settlement performance in structured anisotropic clays:the influence of creep

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Journal of Rock Mechanics and geotechnical Engineering 2016年第5期8卷 672-688页

作者： Brian G.Sexton Bryan A.McCabe Minna Karstunen Nallathamby Sivasithamparam College of Engineering and Informatics National University of Ireland Department of Civil and Environmental Engineering Chalmers University of Technology Computational Geomechanics division Norwegian Geotechnical Institute

The recently developed elasto-viscoplastic Creep-SCLAY1S model has been used in conjunction with PLAXIS 2D to investigate the effectiveness of vibro-replacement in a creep-prone clay. The Creep-SCLAY1S model accounts for anisotropy, bonding, and destructuration, and uses the concept of a constant rate of viscoplastic multiplier to calculate creep strain rate. A comparison of settlement improvement factors with and without creep indicates that ‘total’ settlement improvement factors （primary plus creep） are lower than their ‘primary’ counterparts （primary settlement only）. The lowest settlement improvement factors arise for analyses incorporating the effect of bonding and destructuration. Examination of the variations of vertical stress with time and depth has indicated that vertical stress is transferred from the soil to the column as the soil creeps. This results in additional column yielding. In addition, the radial and hoop stresses in the soil are lower for the ‘creep’ case. The reduced radial stresses lead to additional column bulging and hence more settlement, whereas the hoop stress reductions appear to be a secondary effect, caused by additional plastic deformation for the ‘creep’ case.

关键词： Stone columns Creep Anisotropy Destructuration Finite element (FE) method

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