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Exploring the combination of biochar‐amended soil and automated irrigation technology for water regulation and preservation in green infrastructure

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Deep Underground Science and Engineering 2024年第1期3卷 39-52页

作者： Honghu Zhu Yuanxu Huang Haihong Song Jian Chen Songlei Han Tanwee Mazumder ankit garg School of Earth Sciences and Engineering Nanjing UniversityNanjingChina Department of Civil and Smart Engineering Construction Guangdong Engineering Center for Structure Safety and Health MonitoringShantou UniversityShantouChina Shanghai Municipal Engineering Design Co. LtdShanghaiChina Indian Institute of Technology Madras ChennaiIndia

Biochar is a carbon sink material with the potential to improve water retention in various ***,for the long‐term maintenance of green infrastructure,there is an additional need to regulate the water contents in the covers to maintain vegetation growth in semiarid *** this study,biochar‐amended soil was combined with subsurface drip irrigation,and the water preservation characteristics of this treatment were investigated through a series of one‐dimensional soil column *** ascertain the best treatment method specific to semiarid climatic conditions,the test soil was amended with 0%,1%,3%,and 5%*** irrigation devices equipped with soil moisture sensors were used to control the subsurface water content with the aim of enhancing vegetation *** soil column test lasted 150 h,during which the volumetric water contents and soil suction data were *** experimental results reveal that the soil specimen amended with 3%biochar is the most water‐saving regardless of the time *** with a higher biochar content(e.g.,5%)consumes a more significant amount of water due to the enhancement of the water‐holding *** on the experimental results,it can be concluded that the appropriate ratio can be determined within 1%–3%,which can reduce not only the amount of irrigated/used water but also the time *** technology can be explored for water content regulation in green infrastructure and the development of barriers for protecting the environment around deep underground waste containment.

关键词： biochar drip irrigation underground water preservation water regulation

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Optimization of growth medium for microbially induced calcium carbonate precipitation(MICP) treatment of desert sand

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Journal of Arid Land 2023年第7期15卷 797-811页

作者： Monika DAGLIYA Neelima SATYAM ankit garg Department of Civil Engineering Indian Institute of TechnologyIndore 453552India Guangdong Engineering Center for Structure Safety and Health Monitoring Shantou UniversityShantou 515063China

Wind-induced sand erosion is a natural process, and can have several negative impacts on human health, environment, and economy. To mitigate the wind-induced sand erosion, an environmental friendly technique that helps to bind soil particles is desirable. The microbially induced calcium carbonate precipitation(MICP) treatment has lately become renowned and a viable alternative to enhance the binding of sand particles(especially against wind erosion). The efficiency of Sporosarcina pasteurii bacteria in inducing calcite formation can be influenced by various factors, including the type of growth media used for bacterial culture. Most of the studies have mainly validated the efficiency of S. pasteurii bacteria usually under single growth media for the MICP treatment. However, the efficiency of S. pasteurii under different growth media on calcite formation is rarely explored. The current study explores the effect of *** bacteria on calcite formation under the presence of three different growth media, namely,molasses(MS), tryptic soy broth(TB), and nutrient broth(NB). The three growth media have been applied in the laboratory with and without bacterial solution(control samples). Altered cementation media concentrations(0.5 and 1.0 M) with different pore volumes(PVs), namely, 0.25, 0.50, and 1.00 PV were used in sand-filled tubes for 7 and 14 treatment cycles(1 cycle=24 h). The pH and EC were measured for 12-h period in every 2 h interval, to monitor values at the time of treatment at room temperature. The calcite precipitation was confirmed using SEM(scanning electron microscope), PXRD(powder X-ray diffraction), and calcimeter tests. It was observed that MS generates lower calcite precipitation as compared with NB and TB. However, MS has the advantage of being more economical and abundant(waste product from sugar mills and refineries) as compared with other growth media(NB and TB). It was observed that the minimum and the maximum calcite precipitation using MS i

关键词： growth media molasses tryptic soy broth nutrient broth S.pasteurii calcium carbonate

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Experimental study on mitigating wind erosion of calcareous desert sand using spray method for microbially induced calcium carbonate precipitation

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1556-1567页

作者： Monika Dagliya Neelima Satyam Meghna Sharma ankit garg Department of Civil Engineering Indian Institute of Technology IndoreIndoreIndia Department of Civil and Environmental Engineering Shantou UniversityShantouChina L.N.Gumilyov Eurasian National University Nur-SultanKazakhstan

Wind erosion is one of the significant natural calamities worldwide, which degrades around one-third of global land. The eroded and suspended soil particles in the environment may cause health hazards, *** and respiratory diseases, due to the presence of harmful contaminants, bacteria, and *** present study evaluates the feasibility of microbially induced calcium carbonate precipitation(MICP)technique to mitigate wind-induced erosion of calcareous desert sand(Thar desert of Rajasthan province in India). The temperature during biotreatment was kept at 36℃ to stimulate the average temperature of the Thar desert. The spray method was used for bioaugmentation of Sporosarcina(S.) pasteurii and further treatment using chemical solutions. The chemical solution of 0.25 pore volume was sprayed continuously up to 5 d, 10 d, 15 d, and 20 d, using two different concentration ratios of urea and calcium chloride dihydrate viz 2:1 and 1:1. The biotreated samples were subjected to erosion testing(in the wind tunnel) at different wind speeds of 10 m/s, 20 m/s, and 30 m/s. The unconfined compressive strength of the biocemented crust was measured using a pocket penetrometer. The variation in calcite precipitation and microstructure(including the presence of crystalline minerals) of untreated as well as biotreated sand samples were determined through calcimeter, scanning electron microscope(SEM), and energydispersive X-ray spectroscope(EDX). The results demonstrated that the erosion of untreated sand increases with an increase in wind speeds. When compared to untreated sand, a lower erosion was observed in all biocemented sand samples, irrespective of treatment condition and wind speed. It was observed that the sample treated with 1:1 cementation solution for up to 5 d, was found to effectively resist erosion at a wind speed of 10 m/s. Moreover, a significant erosion resistance was ascertained in15 d and 20 d treated samples at higher wind speeds. The calcite content

关键词： Control wind erosion Microbially induced calcium carbonate precipitation(MICP) Surface strength Wind tunnel Calcite precipitation

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Dynamic performance of submerged floating tunnel with different mooring styles subjected to anchor cable failure

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Frontiers of Structural and Civil Engineering 2023年第10期17卷 1443-1464页

作者： Zhiwen WU Chuhan ZHANG Liwang MOU Guoxiong MEI ankit garg College of Civil Engineering and Architecture Guangxi UniversityNanning 530004China Department of Civil Engineering L.N.Gumilyov Eurasian National UniversityNur-Sultan 010000Kazakhstan Guangdong Engineering Center for Structure Safety and Health Monitoring Shantou UniversityShantou 515063China

Submerged floating tunnels(SFTs)are novel structures for transportation across long-and deep-strait *** to severe wave and current excitation as well as the effects of underwater structures and corrosion,the risk of local anchor cable failure is high,which can result in the progressive failure of the entire *** this study,experimental and numerical investigations are conducted to analyze the dynamic behavior of an SFT with different mooring styles under local cable failure.A custom-designed cable failure device and the birth-and-death element method are used to simulate cable failure(i.e.,progressive failure)via experiments and numerical simulation,respectively.A physical-scale segmental model of an SFT with different mooring styles under anchor cable failure is developed in this study.A segmental and entire-length mathematical model is developed using the ANSYS program to perform the numerical *** results of the segmental numerical and experimental models indicate good *** dynamic response of an SFT with different mooring styles under cable failure is comprehensively investigated by investigating the effects of key parameters(wave period,buoyant weight ratio,and cable failure mechanism).Moreover,the progressive failure of the SFT under cable failure is investigated via a segment model test and a numerical simulation of its entire *** present study can serve as a reference for the safer designs of the SFT mooring style.

关键词： dynamic behaviors submerged floating tunnel cable failure mooring style progressive failure

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Editorial for Internet of Things (IoT) and Artificial Intelligence (AI) in geotechnical engineering

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第4期14卷 1025-1027页

作者： Honghu Zhu ankit garg Xiong(Bill)Yu Hannah Wanhuan Zhou School of Earth Sciences and Engineering Nanjing UniversityNanjingChina Guangdong Engineering Center for Structure Safety and Health Monitoring Shantou UniversityShantouChina Department of Civil and Environmental Engineering Case Western Reserve UniversityClevelandUSA State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering University of MacaoMacaoChina

We are privileged to be invited by the Honorary Editor-in-Chief,Professor Qihu Qian,Editor-in-Chief,Professor Xia-Ting Feng,and the editorial staff of the Journal of Rock Mechanics and Geotechnical Engineering(JRMGE),to serve as Guest Editors for this Special Issue(SI).Over the last decade,the application of the Internet of Things(IoT)and Artificial Intelligence(AI)has increased rapidly to enhance automation in various *** efficient construction and maintenance of geotechnical infrastructures(slopes,tunnels,pipelines,and other ground infrastructures),there is a need to access and examine measured data in *** in data type due to the usage of unmanned aerial vehicle(UAV)photogrammetric sensors,LiDAR,and fiber optic sensing techniques make data management and analysis more *** artificial intelligence,metaheuristic optimization,and data science can be reliable methods in geotechnical engineering for site investigation,risk assessment,design,construction,and maintenance at a higher level.

关键词： artificial IoT gramme

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Effect of biochar type on infiltration,water retention and desiccation crack potential of a silty sand

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Biochar 2020年第4期2卷 465-478页

作者： Rojimul Hussain Sanandam Bordoloi Piyush gupta ankit garg K.Ravi S.Sreedeep Lingaraj Sahoo Department of Civil Engineering Indian Institute of Technology GuwahatiGuwahatiIndia Department of Civil and Environmental Engineering Shantou UniversityShantouChina Department of Biosciences and Bioengineering Indian Institute of Technology GuwahatiGuwahatiIndia

Biochar is a carbon-rich material obtained after thermochemical conversion of biomass under no oxygen *** effect of biochar amendment on soil properties,such as water retention,infiltration and desiccation crack potential was studied in the recent ***,the effect of biochar or feedstock type on these properties is not *** study investigates the effect of two different(in terms of feedstock)types of biochar on the water retention,infiltration and desiccation crack-ing behavior of compacted silty *** retention characteristics,infiltration rate and the progression of desiccation cracks were measured after compacting soil amended with 5-10%(w/w)biochar produced from water hyacinth(WHB)and *** were also taken for an unpyrolyzed material coir pith(CP,sourced from coconut husk)-amended soil for comparing the results of biochar-amended *** results show that the amendment of 5%to 10%biochar increased the maximum water holding capacity(θs),air entry value(AEV)and water content at 1500 kPa(θ1500)of the soil,whereas decreased the infiltration rate and peak crack intensity factor(CIF)of the ***,the application of CP increased the infiltration *** amendment of WHB showed the highest increment in AEV andθ1500 and the highest decrement in infiltration rate and CIF compared to the other *** on the results,it is advisable to use the WHB-amended soil in bioengineered structures that could promote the growth of vegetation by higher water retention and could reduce the potential of leachate formation by decreasing water infiltration and desiccation crack potential.

关键词： Biochar Water hyacinth SWRC Infiltration Desiccation cracks

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Influence of soil density on gas permeability and water retention in soils amended with in-house produced biochar

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第3期13卷 593-602页

作者： ankit garg He Huang Weiling Cai Narala Gangadhara Reddy Peinan Chen Yifan Han Viroon Kamchoom Shubham Gaurav Hong-Hu Zhu Department of Civil and Environmental Engineering Guangdong Engineering Center for Structure Safety and Health MonitoringShantou UniversityShantouChina Department of Civil Engineering Kakatiya Institute of Technology and ScienceWarangalIndia Department of Civil Engineering King Mongkut’s Institute of Technology LadkrabangBangkokThailand Department of Biology Science and Biology Technology Indian Institute of Technology GuwahatiGuwahatiIndia School of Earth Sciences and Engineering Nanjing UniversityNanjing210023China

Biochar has been used as an environment-friendly enhancer to improve the hydraulic properties(*** and water retention)of ***,variations in densities alter the properties of the soil ebiochar *** density variations are observed in agriculture(loosely compacted)and engineering(densely compacted)*** influence of biochar amendment on gas permeability of soil has been barely investigated,especially for soil with different *** major objective of this study is to investigate the water retention capacity,and gas permeability of biochar-amended soil(BAS)with different biochar contents under varying degree of compaction(DOC)***-house produced novel biochar was mixed with the soil at different amendment rates(*** contents of 0%,5%and 10%).All BAS samples were compacted at three DOCs(65%,80%and 95%)in polyvinyl chloride(PVC)*** soil column was subjected to dryingewetting cycles,during which soil suction,water content,and gas permeability were measured.A simplified theoretical framework for estimating the void ratio of BAS was *** experimental results reveal that the addition of biochar significantly decreased gas permeability kg as compared with that of bare soil(BS).However,the addition of 5%biochar is found to be optimum in decreasing kg with an increase of DOC(i.e.k_(g,65%)>k_(g,80%)>k_(g,95%))at a relatively low suction range(<200 kPa)because both biochar and compaction treatment reduce the connected pores.

关键词： Biochar Degree of compaction(DOC) Gas permeability Soil water retention Wettingedrying cycle

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基于MICP技术对污染淤泥质土净化修复作用的研究分析

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汕头大学学报（自然科学版） 2020年第4期35卷 63-68页

作者：周威刘冬王延宁 ankit garg 林鹏汕头大学土木与环境工程系汕头515063 广东省结构安全与监测工程技术研究中心汕头515063

本文针对重金属污染的淤泥质土展开了净化修复作用研究.通过微生物诱导碳酸钙沉积(MICP)技术,利用巴氏芽孢杆菌自身脲酶水解尿素产生碳酸根离子,与淤泥质土体中重金属离子生成沉淀,探究淤泥质土体中不同重金属离子、不同老化期的净化修... 详细信息

本文针对重金属污染的淤泥质土展开了净化修复作用研究.通过微生物诱导碳酸钙沉积(MICP)技术,利用巴氏芽孢杆菌自身脲酶水解尿素产生碳酸根离子,与淤泥质土体中重金属离子生成沉淀,探究淤泥质土体中不同重金属离子、不同老化期的净化修复效率.研究表明,污染淤泥质土在MICP作用下净化修复都很显著,基本净化效率达到了80%.对于不同重金属离子、混合污染程度及老化期,固定效率有所差异.

关键词： MICP技术淤泥质土重金属老化期固定效率

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基于微生物诱导碳酸钙沉淀技术加固滨海软土的试验研究

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汕头大学学报（自然科学版） 2020年第3期35卷 47-54页

作者：蚁曼冰王延宁刘东 ankit garg 林鹏汕头大学土木与环境工程系汕头515063 广东省结构安全与监测工程技术研究中心汕头515063

为有效利用微生物诱导碳酸钙沉淀(MICP)技术加固滨海软土,以养护时间、营养液浓度、菌液浓度为影响因素,以抗剪强度、含水率和干密度为指标,进行MICP技术加固软土性能的实验研究.结果表明:MICP技术适用于处理滨海软土,可以显著提升软土... 详细信息

为有效利用微生物诱导碳酸钙沉淀(MICP)技术加固滨海软土,以养护时间、营养液浓度、菌液浓度为影响因素,以抗剪强度、含水率和干密度为指标,进行MICP技术加固软土性能的实验研究.结果表明:MICP技术适用于处理滨海软土,可以显著提升软土的物理性质、提高软土强度.仅作用三天,可提高抗剪强度超过两倍,合理的养护天数、营养液浓度、菌液浓度等组合因素对加固性能也有直接影响.相关机理性的研究结果为滨海软土地基处理提供了一个全新的技术手段.

关键词：软土加固微生物诱导碳酸钙沉积(MICP) 直剪试验

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