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unconfined compressive strength prediction of soils stabilized using artificial neural networks and support vector machines

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Frontiers of Structural and Civil Engineering 2021年第2期15卷 520-536页

作者： Alireza TABARSA Nima LATIFI Abdolreza OSOULI Younes BAGHERI Depatrment of Civil Engineering Faculty of EngineeringGolestan UniversityGorgan 49138-15759Iran Terr aeon Consultants Inc.NashvilleTN 37211USA Civil Engineering Department Southern Illinois UniversityEdwardsvilleIL 62026-1800USA Faculty of Engineering Mirdamad Institute of Higher EducationGorgan 49166-53989Iran

This study aims to improve the unconfined compressive strength of soils using additives as well as by predicting the strength behavior of stabilized soils using two artificial-intelligence-based *** soils used in this study are stabilized using various combinations of cement,lime,and rice husk *** predict the results of unconfined compressive strength tests conducted on soils,a comprehensive laboratory dataset comprising 137 soil specimens treated with different combinations of cement,lime,and rice husk ash is *** artificial-intelligence-based models including artificial neural networks and support vector machines are used comparatively to predict the strength characteristics of soils treated with cement,lime,and rice husk ash under different *** suggested models predicted the unconfined compressive strength of soils accurately and can be introduced as reliable predictive models in geotechnical *** study demonstrates the better performance of support vector machines in predicting the strength of the investigated soils compared with artificial neural *** type of kernel function used in support vector machine models contributed positively to the performance of the proposed ***,based on sensitivity analysis results,it is discovered that cement and lime contents impose more prominent effects on the unconfined compressive strength values of the investigated soils compared with the other parameters.

关键词： unconfined compressive strength artificial neural network support vector machine predictive models regression

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Improving the unconfined compressive strength of Red Clay by Combining Biopolymers with Fibers

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Journal of Renewable Materials 2021年第8期9卷 1503-1517页

作者： Zhiyu Weng Lina Wang Qiang Liu Xuemin Pan Yonghao Xu Jing Li School of Construction Engineering Yunnan Agricultural UniversityKunming650201China Powerchina Kunming Engineering Corporation Limited Kunming650051China South-West Survey and Design Group Company Limited Kunming650200China

To explore an environmentally friendly improvement measure for red clay,the function and mechanism of xanthan gum biopolymer and polypropylene fibers on the strength properties of red clay were investigated by unconfined compressive strength and scanning electron microscopy *** test results demonstrated that the contents and curing ages of xanthan gum had significant influences on the unconfined compressive strength of red *** with untreated soil,1.5%xanthan gum content was the optimal ratio in which the strength increment was between 41.52 kPa and 64.73 *** the other hand,the strength of xanthan gum-treated red clay increased,whereas the ductility decreased with the increase in curing ages,indicating that the xanthan gum-treated red clay started to gradually consolidate after 3 days of curing and stiffness significantly improved between 7 and 28 days of *** results also showed that the synergistic consolidation effects of the xanthan gum–polypropylene fibers could not only effectively enhance the strength of red clay but also reduce the brittle failure *** strengths of soil treated with 2.0%xanthan gum-polypropylene fibers were 1.9–2.41 and 1.12–1.47 times than that of red clay and 1.5%xanthan gum-treated clay,*** results of study provide the related methods and experiences for the field of ecological soil treatment.

关键词： Biopolymer xanthan gum polypropylene fiber red clay micro-mechanism unconfined compressive strength

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The Influence of Freeze-Thaw Cycles on unconfined compressive strength of Lignin Fiber-Reinforced Loess

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Journal of Renewable Materials 2022年第4期10卷 1063-1080页

作者： Zhongnan Gao Xiumei Zhong Qian Wang Yongqi Su Jun Wang Lanzhou Institute of Seismology China Earthquake AdministrationLanzhou730000China Key Laboratory of Loess Earthquake Engineering China Earthquake Administration&Gansu ProvinceLanzhou730000China Gansu Bureau of Coal Geology Lanzhou730000China

In the seasonal permafrost region with loess distribution,the influence of freeze-thaw cycles on the engineering performance of reinforced loess must be paid attention *** studies have shown that the use of fiber materials can improve the engineering performance of soil and its ability to resist freeze-thaw *** the same time,as eco-environmental protection has become the focus,which has been paid more and more attention to,it has become a trend to find new environmentally friendly improved materials that can replace traditional chemical *** purpose of this paper uses new environmental-friendly improved materials to reinforce the engineering performance of loess,improve the ability of loess to resist freeze-thaw cycles,and reduce the negative impact on the ecological *** reinforce the engineering performance of loess and improve its ability to resist freeze-thaw cycles,lignin fiber is used as a reinforcing *** a series of laboratory tests,the unconfined compressive strength(UCS)of lignin fiber-reinforced loess under different freeze-thaw cycles was *** effects of lignin fiber content and freeze-thaw cycles on the strength and deformation modulus of loess were *** with the microstructure features,the change mechanism of lignin fiber-reinforced loess strength under freeze-thaw cycles was *** results show that lignin fiber can improve the UCS of loess under freeze-thaw cycles,but the strengthening effect no longer increases with the increase of fiber *** the fiber content is less than 1%,the UCS growth rate of loess is the fastest under freeze-thaw *** the UCS of loess with 1%fiber content is the most stable under freeze-thaw *** freeze-thaw cycles increase the deformation modulus of loess with 1%fiber content,and its ability to resist deformation is obviously better than loess with 1.5%,2%and 3%fiber *** fiber content over 1%will weaken the strengthening effect of

关键词： Fiber-reinforced loess freeze-thaw cycles unconfined compressive strength deformation modulus

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Analysis of influence factors of unconfined compressive strength for composite soil stabilizer-stabilized gravel soil

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Journal of Southeast University(English Edition) 2017年第4期33卷 484-489页

作者： Zhao Yulong Gao Ying Zhang Yiluo Wang Yong School of Transportation Southeast University Nanjing 210096 China School of Highway Chang’an University X i’an 710064 China Hubei Provincial Communications Planning and Design Institute Wuhan 430051 China

In order to investigate the effect o f some factors on the unconfined compressive strength(UCS)for composite soil stabilizer-stabilized gravel soil(CSSSGS),the orthogonal test is adopted to set up the experimental *** levels o f each factor armconsidered to obtain the change laws o f UCS,in which the binder dosages are8%,10%,and12%;the curing times ae7,14and21d;the gradation nae0.3,0.35and0.4;and the degrees of compaction are95%,97%,and99%.The range analysis clearly indicates that the influence degree o f the four factors on UCS is in such an order:dosage,age,gradation,and degree o f *** variance analysis shows that only the composite soil stabilizer dosage can significantly affect *** road construction,the examination o f composite soil stabilizer dosage and base-course maintenance should be given much more attention to obtain satisfactory base-course strength,compared w ith gradation floating and the change of degree o f compaction.

关键词： base course composite soil stabilizer gravel soil unconfined compressive strength orthogonal test

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Microstructure Evolution and Mechanism of strength Development of Fly Ash Paste

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 152-163页

作者： MA Shuzhao WU Shunchuan HUANG Mingqing CHENG Haiyong JIANG Guanzhao NIU Yonghui LIU Zemin SUN Wei Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunming 650093China Zijin School of Ge-ology and Mining Fuzhou UniversityFuzhou 350108China

Three types of activators such as sodium hydroxide,calcium oxide and triethanolamine(TEA)are used to establish different activation environments to address the problems associated with the process of activating fly ash *** conducted mechanical tests and numerical simulations to understand the evolution of microstructure,and used environmental scanning electron microscopy(ESEM)and energy dispersive spectroscopy(EDS)techniques to analyze the microenvironments of the *** mechanical properties of fly ash paste under different activation conditions and the changes in the microstructure and composition were *** results revealed that under conditions of low NaOH content(1%-3%),the strength of the sample increased *** the content exceeded 4%,the rate of increase in strength *** on the results,the optimal NaOH content was identified,which was about 4%.A good activation effect,especially for short-term activation(3-7 d),was achieved using TEA under high doping *** activation effect was poor for long-term strength after 28 *** CaO content did not significantly affect the degree of activation *** maximum effect was exerted when the content of CaO was 2%.The virtual cement and concrete testing laboratory(VCCTL)was used to simulate the hydration process,and the results revealed that the use of the three types of activators accelerated the formation of Ca(OH)_(2) in the *** activators also corroded the surface of the fly ash particles,resulting in a pozzolanic *** active substances in fly ash were released efficiently,and hydration was *** pores were filled with hydration products,and the microstructure changed to form a new frame of paste filling that helped improve the strength of fly ash paste.

关键词： paste filling fly ash activator unconfined compressive strength microstructure hydration simulation

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Artificial intelligence model for studying unconfined compressive performance of fiber-reinforced cemented paste backfill

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Transactions of Nonferrous Metals Society of China 2021年第4期31卷 1087-1102页

作者： Zhi YU Xiu-zhi SHI Xin CHEN Jian ZHOU Chong-chong QI Qiu-song CHEN Di-jun RAO School of Resources and Safety Engineering Central South UniversityChangsha 410083China

To reduce the difficulty of obtaining the unconfined compressive strength(UCS) value of fiber-reinforced cemented paste backfill(CPB) and analyze the comprehensive impact of conventional and fiber variables on the compressive property, a new artificial intelligence model was proposed by combining a newly invented meta-heuristics algorithm(salp swarm algorithm, SSA) and extreme learning machine(ELM) technology. Aiming to test the reliability of that model, 720 UCS tests with different cement-to-tailing mass ratio, solid mass concentration, fiber content, fiber length, and curing time were carried out, and a strength evaluation database was collected. The obtained results show that the optimized SSA-ELM model can accurately predict the uniaxial compressive strength of the fiber-reinforced CPB, and the model performance of SSA-ELM model is better than ANN, SVR and ELM models. Variable sensitivity analysis indicates that fiber content and fiber length have a significant effect on the UCS of fiber-reinforced CPB.

关键词： fiber-reinforced cemented paste backfill unconfined compressive strength prediction extreme learning machine salp swarm algorithm

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strength and deformation characteristics of carbonated reactive magnesia treated silt soil

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Journal of Central South University 2015年第5期22卷 1859-1868页

作者：蔡光华刘松玉杜延军章定文郑旭 Institute of Geotechnical Engineering Southeast University

A series of unconfined compression tests(UCTs) were conducted to investigate the effects of content of reactive magnesia(Mg O) and carbonation time on the engineering properties including apparent characteristics, stress-strain relation, and deformation and strength characteristics of reactive Mg O treated silt soils. The soils treated with reactive Mg O at various contents were subjected to accelerated carbonation for different periods of time and later, UCTs were performed on them. The results demonstrate that the reactive Mg O content and carbonation time have remarkable influences on the aforementioned engineering properties of the soils. It is found that with the increase in reactive Mg O content, the unconfined compressive strength(qu) increases at a given carbonation time(strength-prediction model, by taking into account two variables of reactive Mg O content and carbonation time, is proposed to estimate qu of carbonated reactive Mg O treated soils. A comparison of the predicated values of qu with the measured ones indicates that the proposed model has satisfactory accuracy.

关键词： carbon dioxide accelerated carbonation reactive magnesia unconfined compressive strength strength-prediction model

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Experimental study on slurry-induced fracturing during shield tunneling

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Frontiers of Structural and Civil Engineering 2021年第2期15卷 333-345页

作者： Teng WANG Dajun YUAN Dalong JIN Xinggao LI Key Laboratory of Urban Underground Engineering of the Education Ministry Beijing Jiaotong UniversityBeijing100044China

Facial support in slurry shield tunneling is provided by slurry pressure to balance the external earth and water *** fracturing may occur and cause a significant decrease in the support pressure if the slurry pressure exceeds the threshold of the soil or rock material,resulting in a serious face collapse *** the occurrence of hydraulic fracturing in a slurry shield requires investigating the effects of related influencing factors on the hydraulic fracturing pressure and fracture *** this study,a hydraulic fracturing apparatus was developed to test the slurry-induced fracturing of cohesive *** effects of different sample parameters and loading conditions,including types of holes,unconfined compressive strength,slurry viscosity,and axial and circumferential loads,on the fracturing pressure and fracture dip were *** results indicate that the fracture dip is mainly affected by the deviator *** fracturing pressure increases linearly with the increase in the circumferential pressure,but it is almost independent of the axial *** unconfined compressive strength of soil can reflect its ability to resist fracturing *** fracturing pressure increases with an increase in the unconfined compressive strength as well as the slurry *** on the test results,an empirical approach was proposed to estimate the fracturing pressure of the soil.

关键词： slurry shield tunneling hydraulic fracturing test fracturing pressure fracture dip unconfined compressive strength slurry viscosity

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Effects of Lateral Variation in Vegetation and Basin ‘Dome' Shape on Tropical Lowland Peat Stabilisation in the Kota Samarahan-Asajaya Area, West Sarawak, Malaysia

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Acta Geologica Sinica(English Edition) 2014年第3期88卷 894-914页

作者： Mohamad Tarmizi Mohamad ZULKIFLEY Tham Fatt NG John Kuna RAJ Roslan HASHIM Muhammad Aqeel ASHRAF Department of Geology Faculty of Science University of Malaya Department of Civil Engineering Faculty of Science University of Malaya

Field surveys indicate lateral variation in peat humification levels （von Post） in dominantly occurring fibric,fibric to hemic,sapric and hemie to sapric peats across a gradient from the margin towards the centre of tropical lowland peat ***-peat stabilisation can be enhanced by adding mineral soil fillers （silt,clays and fine sands） obtained from Quaternary floodplain deposits and residual soil （weathered schist）.The unconfined compressive strength （UCS） of the stabilised cement-mineral soil fifler-peat mix increases with the increased addition of selected mineral soil *** variation in the stabilised peat strength （UCS） in the top 0 to 0.5 m layer was found from the margin towards the centre of the tropical lowland peat *** variations in the UCS of stabilised tropical lowland peats along a gradient from the periphery towards the centre of the peat dome are most likely caused by a combination of factors due to variations in the mineral soil or ash content of the peat and horizontal zonation or lateral variation in the dominant species of the plant assemblages （due to successive vegetation zonation of the peat swamp forest from the periphery towards the centre of the tropical lowland peat dome）.

关键词： tropical lowland peat dome/basin mineral soil filler cement-filler-peat stabilisation,topogenic unconfined compressive strength lateral vegetation succession.

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Performance evaluation of laterite soil embankment stabilized with bottom ash,coir fiber,and lime

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Journal of Mountain Science 2024年第7期21卷 2334-2351页

作者： Yunusa Hamdanu SANI Amin EISAZADEH School of Civil Engineering and Technology Sirindhorn International Institute of TechnologyThammasat UniversityPathum Thani 12120Thailand

In tropical regions,heavy rainfall induces erosion and shallow landslides on road ***-based stabilization methods,common in these regions,contribute to climate change due to their high carbon *** study explored the potential application of coir fiber-reinforced laterite soil-bottom ash mixtures as embankment materials in the *** objective is to enhance engineered embankment slopes'erosion resistance and stability while offering reuse options for industrial *** study examined various mix designs for unconfined compressive strength(UCS)and permeability,utilizing 30%bottom ash(BA)and 1%coir fiber(CF)with varying sizes ranging from 10 to 40 mm,6%lime,and laterite soil(LS),followed by microstructural *** results demonstrate that the compressive strength increases as the CF length increases to 25 *** contrast,permeability increases continuously with increasing CF ***-treated mixtures exhibit superior short-and long-term strength and reduce permeability owing to the formation of cementitious materials,as confirmed by microstructural analyses.A lab-scale slope box was constructed to evaluate the surface erosion of the stabilized laterite soil *** on the rainfall simulation results,the LS-BA-CF mixtures show better resistance to erosion and deformation compared to untreated LS,especially when lime is added to the top *** study provides insights into a sustainable and cost-effective approach for slope stabilization using BA and CF,offering a promising solution for tropical regions susceptible to surface erosion and landslides.

关键词： Lateritic soil Bottom ash Coir fiber lime unconfined compressive strength Permeability FESEM/EDS Rainfall simulation tests

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