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In situ digital testing method for quality assessment of soft soil improvement with polyurethane

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1732-1748页

作者： X.F.Wang C.J.Wang W.V.Yue Z.J.Zhang Z.Q.Yue Department of Civil Engineering China University of Geosciences (Beijing)BeijingChina Department of Water Science and Engineering Zhengzhou UniversityZhengzhouChina Department of Geotechnical Engineering Tongji UniversityShanghaiChina Department of Civil Engineering The University of Hong KongChina

This study purposes an in situ testing method on quality assessment of soil *** drilling data includes the spatial distribution and in situ strength of untreated and treated soil along three different drillholes measured by on-site drilling monitoring *** factual drilling data can characterize the degree of soil improvement by penetration injection with permeable *** from on-site drilling monitoring shows that the linear zones represent constant drilling speeds shown in the plot of drill bit advancement *** drilling time,which indicates the spatial distributions of soil *** soil profile at the study site is composed of four layers,which includes fill,untreated silty clay,treated silty clay,and mucky *** results of soil profile are verified by the parallel site *** constant drilling speeds profile the coring-resistant strength of drilled *** comparing with the untreated silty clay,the constant drilling speeds of the treated silty clay have been decreased by 13.0-62.8%.Two drilling-speed-based indices of 61.2%and 65.6%are proposed to assess the decreased average drilling speed and the increased in situ strength of treated silty *** tests,*** compressive strength(UCS)test,have been performed with core sample to investigate and characterize in situ strength by comparing that with drilling *** show that the average predicted strengths of treated silty clay are 2.4-6.9 times higher than the average measured strength of untreated silty *** UCS-based indices of 374.5%and 344.2%verified the quality assessment(QA)results by this new in situ *** method provides a cost-effective tool for quality assessment of soil improvement by utilizing the digital drilling data.

关键词： Drilling process monitoring system Hydraulic rotary drilling process Constant drilling speed soil improvement Quality assessment

Steel Slag as an Iron Fertilizer for Corn Growth and soil improvement in a Pot Experiment

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Pedosphere 2006年第4期16卷 519-524页

作者： WANG Xian CAI Qing-Sheng College of Life Sciences Nanjing Agricultural University Nanjing 210095 （China） Department of Biology Zhoukou Normal College Zhoukou 366000 （China）

The feasibility of steel slag used as an iron fertilizer was studied in a pot experiment with corn. Slag alone or acidified slag was added to two Fe-deficient calcareous soils at different rates. Results showed that moderate rates (10 and 20 g kg-1) of slag or acidified slag substantially increased corn dry matter yield and Fe uptake. Application of steel slag increased the residual concentration of ammonium bicarbonate-diethylenetriamine pentaacetic acid (AB-DTPA) extractable Fe in the soils. The increase of extractable Fe was usually proportional to the application rate, and enhanced by the acidification of slag. Steel slag appeared to be a promising and inexpensive source of Fe to alleviate crop Fe chlorosis in Fe-deficient calcareous soils.

关键词： corn growth iron fertilizer pot experiment soil improvement steel slag

The influence of hydrochar from biogas digestate on soil improvement and plant growth aspects

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Biochar 2020年第2期2卷 177-194页

作者： Megan de Jager Michael Rohrdanz Luise Giani Carl Von Ossietzky Universitat Institut für Biologie und UmweltwissenschaftenOldenburgGermany

Hydrochar(HC),produced by hydrothermal carbonization,offers technical advantages over biochar(BC)produced by pyrolysis,and is suitable for soil amelioration,carbon sequestration,and enhanced plant *** grain size has been shown to influence nutrient retention,microbial colonization and aggregate formation;however,similar research for HC is *** trials were conducted to investigate the influence of HC grain size[coarse(6.3-2 mm),medium(2-0.63 mm)and fine(soil improvement in three soils:loamy Chernozem,sandy Podzol,and clayey Gleysol,at a 5%HC application rate(w/w).All soils including two controls(with and without plants)were analysed for water holding capacity(WHC),cation exchange capacity(CEC),wet aggregate stability,pH,plant available nutrients(PO_(4)-P,K and N_(min))and germination and biomass success using standard laboratory and statistical *** pH showed a compensatory shift toward the HC pH(7.2)in all soils over the course of the *** example,the pH of the medium grained HC treatment for the Chernozem decreased from 7.9 to 7.2 and increased in the Podzol and Gleysol from 5.9 to 6.1 and 4.9 to 5.5,*** nutrient-rich HC(2034±38.3 mg kg^(−1) PO_(4)-P and 2612.5±268.7 mg kg^(−1) K content)provided only a short-term supply of nutrients,due to the relatively easily mineralized fraction of HC,which allowed for quick nutrient *** pH and PO_(4)-P effects were most pronounced in the fine grained HC treatments,with a~87%,~308%and~2500%increase in PO_(4)-P content in the Chernozem,Podzol and Gleysol,respectively,compared to the controls at the beginning of the *** same trend was observed for the K and NH_(4)^(+)content in the fine and medium grained HC treatments in all *** seed germination inhibition of Chinese cabbage was observed,with average germina-tion rates>50%in all *** effect on NO_(3)^(−)content was indeterminable,while there was little to no effect on biom

关键词： Hydrochar soil improvement Grain size Plant available nutrients

Experimental study on soil improvement with stone columns and granular blankets

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Journal of Central South University 2018年第4期25卷 866-878页

作者： Nima MEHRANNIA Farzin KALANTARY Navid GANJIAN Department of Civil Engineering Tehran Science and Research Branch Islamic Azad University Department of Civil Engineering K.N.Toosi University of Technology

Stone column is one of the soil stabilizing methods that is used to increase bearing capacity and decrease the settlement of soft *** and unreinforced granular blankets are now being utilized to overcome the problems of soft *** this research,the bearing capacity of stone columns,granular blanket,and a combination of both methods in reinforced and unreinforced modes were studied using scaled physical *** show that using granular blanket,stone column,and combination of both improves bearing capacity of soft *** geogrid as the reinforcement of granular blankets and geotextile as stone-column encasement increases the efficiency of granular blankets and stone columns ***,in the case of using geotextile around the stone column,the stress concentration ratio of the stone column will increase as well as its rigidity and bearing capacity.

关键词： stone column bearing capacity geogrid geotextile granular blanket soil improvement

A Study of the Effect of soil improvement Based on the Numerical Site Response Analysis of Natural Ground in Babol City

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Open Journal of Civil Engineering 2016年第2期6卷 163-178页

作者： Asskar Janalizadechoobbasti Mehran Naghizadeh rokni Aida Talebi Civil Engineering Babol University of Technology Babol Iran

A series of numerical calculations have been performed to investigate the effect of soil improvement on seismic site response. Seismic site response analyses were also performed using data collected from a study area in Babol city. The improved site is a composite ground and has more or less different mechanical properties than the natural ground. In this research, the influence of the elastic modulus of the pile, the pile distance ratio, ground motion input, distance to fault rupture, and PGA of the earthquakes on seismic response characteristics are especially investigated. The results reveal that the values of the PGA and amplification factor on the surface of the natural and improved grounds depend strongly on the fundamental period of the site, the predominant period, and the intensity of the ground motion input. The acceleration response spectra also are affected by the characteristics of ground motion input and soil layers. Changing the pile distance ratio doesn’t have a significant effect on the seismic response of the site.

关键词： Seismic Site Response Amplification Factor Acceleration Response Spectra soil improvement Pile Numerical Analysis Babol

Effects of Microbial Fertilizers on soil improvement and Wheat Growth Characteristics in Saline-alkali Land

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Agricultural Biotechnology 2024年第4期13卷 76-81页

作者： Gen SONG Ziru LI Baohai ZHANG Zhenhua JIA Jirong CUI Dingxin GUO Lili HAN Yanhong WU Jianlong FENG Yan GAO Mingying LIU Chunguang SONG Guojia JI Changsong WANG Zhiwei ZHANG Qinhuangdao Hemiao Biotechnology Co. Ltd.Qinhuangdao 066000China Hebei Normal University of Science&Technology Qinhuangdao 066000China Institute of Biology Hebei Academy of SciencesShijiazhuang 050081China Changli Bureau of Agriculture and Rural Affairs Qinhuangdao 066000China Huanghua Win-win Agricultural Materials Co. LTD.Huanghua 061100China

[Objectives]This study was conducted to further enrich the research on saline-alkali land improvement,and explore the effects of biological bacterial fertilizers containing Bacillus subtilis and Bacillus velezensis HM-3 in saline-alkali land improvement and crop growth promotion.[Methods]Wheat was planted in saline-alkali land in Huanghua City,Hebei Province,and a mixed application experiment was carried out using biological agents from Hemiao Biotechnology Co.,Ltd.[Results]Compared with the field of control check(CK),water-soluble salts and pH value in the experimental fields decreased,and living bacteria count in the soil ***,the economic characters of wheat in the experimental fields showed excellent performance,with yields increasing by 39.09%and 27.49%compared with the *** could be seen that the application of biological bacterial fertilizers achieved obvious effects of improving saline-alkali soil and increasing wheat yield.[Conclusions]In this study,the effects of biological bacterial fertilizers on saline-alkali land and wheat growth characters were clarified,providing some technical support and theoretical guidance for wheat planting in Huanghua saline-alkali land.

关键词： Saline-alkali land soil improvement Wheat Yield

An Overview of soil improvement through Ground Grouting

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Journal of Geoscience and Environment Protection 2024年第1期12卷 51-63页

作者： Md Ratan Bhuiyan Salequr Rahman Masum Md Tushar Parvej S M Sanuwar School of Civil Engineering Hydraulic Engineering Tianjin University Tianjin China College of Civil Engineering and Architecture China Three Gorges University Yichang China

soil is an essential component of what surrounds us in nature, providing as the basis for our infrastructure and construction. However, soil is not always suitable for construction due to a variety of geotechnical issues such as inadequate bearing capacity, excessive settlement, and liquefaction susceptibility. Through improving the engineering qualities of soil, such as strength, permeability, and stability, ground grouting is a specific geotechnical method used. Using a fluid grout mixture injected into the subsurface, holes are filled and weak or loose strata are solidified as the material seeps into the soil matrix. The approach’s adaptability in addressing soil-related issues has made it more well-known in the fields of civil engineering and construction. In the end, this has improved groundwater management, foundation support, and overall geotechnical performance.

关键词： Grouting soil improvement Permeation Grouting Compaction Grouting and Jet Grouting

State-of-the-art review on plant-based solutions for soil improvement

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Biogeotechnics

Biogeotechnics 2023年第3期1卷 18-35页

作者： Shanshan Li Ziteng Wang Hans Henning Stutz Karlsruhe Institute of Technology Institute of Soil Mechanics and Rock MechanicsEngler-Bunte-Ring 1476131 KarlsruheGermany

Vegetation has been used as a means in geotechnical engineering for soil improvement and erosion *** paper aims to present a state-of-the-art review and future prospective on soil improvement and reinforcement with plants,mainly from a perspective of plant mechanical *** mechanics of roots and root-soil composite are reviewed with regard to experiments,including root mechanical tests,direct shear tests,pullout tests and triaxial *** factors influencing root reinforcement are characterized and discussed to explain root-soil interactions and related soil strengthening *** cost and efficiency,extreme climates,and the conflicting mechanisms of plant growth and soil improvement,researchers have introduced nature-based water-soluble polymers(WSPs)into soil improvement to promote vegetation establishment and provide additional binding strength between soil *** the benefits,existing related researches and concepts are scarce,and there is still a significant knowledge gap in the coupling effect of WSP and plants for soil *** review indicates that the combination of vegetation and WSP has the potential to create“trade-off”and“complementarity”for progressive soil ***,new research topics in the field of soil improvement with plants are identified in the review.

关键词： soil improvement Plants Root reinforcement Water-soluble polymer(WSP)

Effects of Biochar on Tobacco-planting soil improvement and Tobacco Quality in Mudanjiang Area

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Agricultural Science & Technology 2017年第5期18卷 820-826页

作者：王欢欢任天宝张志浩元野王博匡岗刘德玉刘国顺河南农业大学烟草学院、国家烟草栽培生理生化研究基地郑州450002 牡丹江烟草科学研究所黑龙江牡丹江157011 牡丹江烟叶公司黑龙江牡丹江157011

This study was conducted to study the feasibility of biochar in soil im- provement and tobacco quality. The black soil in NinganCountry of Mudanjiang was used as the material in this study, and the effects of biochar on tobacco-planting soil C/N, soil microorganisms, the development of tobacco, and chemical compo- nents and neutral aroma components in flue-cured tobacco werestudied. The results showed that the application of biochar at a rate of 1 800 kg/hm2 could increase soil C/N by 31.79%, and the quantity of actinomycetes in the soil was 3.8 times as much as that in control. The growth wasobviously better after biochar application, plant height and effective leaf number were significantly higher than those ofcontrol, but total sugar and nicotine were not significantly different. The application of biochar at a rate of 1 200 kg/hm2 increased the potassium content by 11%, the application of biochar at a rate of 2 400 kg/hm2 improved total sugar content by 5.40%, and the application of biochar at a rate of 1 800 kg/hm2 made the tobacco solanone content 1.97 times as that of control. Comprehensive studies showed that the application of biochar 1 200-1 800 kg/hm2 could improvesoilenvironment, and promote tobacco growth and quality.

关键词： Flue-cured tobacco Biochar soil improvement Quality