Environmental geotechnics最新文献_第5页

A Review of Physicochemical Stabilization for Improved Engineering Properties of Clays 改善粘土工程性能的物化稳定研究进展

IF 2.2 4区工程技术

Environmental geotechnics Pub Date : 2023-08-07 DOI: 10.3390/geotechnics3030041

Ahmed Bukhary, S. Azam

{"title":"A Review of Physicochemical Stabilization for Improved Engineering Properties of Clays","authors":"Ahmed Bukhary, S. Azam","doi":"10.3390/geotechnics3030041","DOIUrl":"https://doi.org/10.3390/geotechnics3030041","url":null,"abstract":"Severe climatic and environmental conditions warrant the use of stabilization agents in aid of compaction for sustainable improvement in engineering properties of clays. Physicochemical agents are a viable option because they are cost effective, environmentally friendly, and offer improved long-term performance of treated soils. This research developed a fundamental understanding of the clay–water–electrolyte admixtures relations. Based on a comprehensive literature review, the effect of nanomaterials, biopolymers, and geopolymers on the behavior of compacted clays was investigated. It was found that all of these admixtures facilitate the development of an aggregated soil microstructure through unique mechanisms. Biopolymers have the highest water adsorption capacity followed by geopolymers and then by nanomaterials. The effect of admixtures on optimum compaction properties follows a decreasing trend similar to untreated clays (S = 80% ± 20%). The variation of hydraulic conductivity, compression index, and compressive strength are largely within the family of curves identified by typical relationships for compacted clays. These preliminary findings indicate that not all engineering properties are improved to the same level by the different types of physicochemical admixtures. The specific nature of geotechnical engineering (soil type and site conditions) as well as the wide range of admixture types and potential biodegradation of some of the reagents are the major shortcoming of using this class of materials.","PeriodicalId":11823,"journal":{"name":"Environmental geotechnics","volume":"30 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81149316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Characterization, remediation and valorization of contaminated sediments – a critical review 受污染沉积物的表征、修复和估价——一项重要综述

IF 2.2 4区工程技术

Environmental geotechnics Pub Date : 2023-08-03 DOI: 10.1680/jenge.22.00201

Prithvendra Singh, C. Vitone, B. Baudet, F. Cotecchia, M. Notarnicola, M. Plötze, A. Puzrin, Venkata Siva Naga Sai Goli, M. Mali, Rosella Petti, F. Sollecito, F. Todaro, Abdulla Muththalib, A. Mohammad, Mrunal S Bokade, Devendra Singh

{"title":"Characterization, remediation and valorization of contaminated sediments – a critical review","authors":"Prithvendra Singh, C. Vitone, B. Baudet, F. Cotecchia, M. Notarnicola, M. Plötze, A. Puzrin, Venkata Siva Naga Sai Goli, M. Mali, Rosella Petti, F. Sollecito, F. Todaro, Abdulla Muththalib, A. Mohammad, Mrunal S Bokade, Devendra Singh","doi":"10.1680/jenge.22.00201","DOIUrl":"https://doi.org/10.1680/jenge.22.00201","url":null,"abstract":"The constraints associated with the availability of huge amounts of natural resources for infrastructure and agricultural development calls for the reuse and recycling of anthropogenically created geomaterials, which is in line with the UN Sustainable Development Goals. In this context, valorization of dredged sediments (DS), obtained from water bodies such as rivers, lakes, oceans, etc., as a resource material is worth considering. Unfortunately, DS might be contaminated and exhibit a higher moisture-holding capacity due to higher organic matter and clay minerals/colloids. These attributes pose a serious question towards dumping of the DS in the deep sea (in the case of marine sediments), a practice which though prevails presently but endangers marine life. Hence, the way forward would be to characterize them holistically, followed by adequate treatment to make them ecologically synergetic before developing a strategy for their valorization. In this regard, many studies have been focused on the characterization and treatment of DS to make them environmentally safe manmade resource. With this in view, a critical synthesis of the published literature pertaining to the (i) characterization, (ii) treatment, remediation, and immobilization of contaminants, and (iii) utilization of DS has been conducted, and the salient findings are presented in this paper. Based on this study, it was observed that the DS acts as a sink for emerging contaminants for which no remediation strategies are available. Moreover, the study highlighted the lacuna in upscaling the existing treatment and stabilization techniques to field conditions while highlighting the concept of circular economy.","PeriodicalId":11823,"journal":{"name":"Environmental geotechnics","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46626541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Estimation of Low-Velocity Landfill Thickness with Multi-Method Seismic Surveys 用多方法地震测量估算低速填埋厚度

IF 2.2 4区工程技术

Environmental geotechnics Pub Date : 2023-08-02 DOI: 10.3390/geotechnics3030040

Yaniv Darvasi, A. Agnon

{"title":"Estimation of Low-Velocity Landfill Thickness with Multi-Method Seismic Surveys","authors":"Yaniv Darvasi, A. Agnon","doi":"10.3390/geotechnics3030040","DOIUrl":"https://doi.org/10.3390/geotechnics3030040","url":null,"abstract":"Conventional geophysical methods are suitable for estimating the thicknesses of subsoil layers. By combining several geophysical methods, the uncertainties can be assessed. Hence, the reliability of the results increases with a more accurate engineering solution. To estimate the base of an abandoned landfill, we collected data using classical approaches: high-resolution seismic reflection and refraction, with more modern methods including passive surface wave analysis and horizontal-to-vertical spectral ratio (HVSR) measurements. To evaluate the thickness of the landfill, three different datasets were acquired along each of the two seismic lines, and five different processing methods were applied for each of the two arrays. The results of all the classical methods indicate very consistent correlations and mostly converge to clear outcomes. However, since the shear wave velocity of the landfill is relatively low (<150 (m/s)), the uncertainty of the HVSR results is significant. All these methods are engineering-oriented, environmentally friendly, and relatively low-cost. They may be jointly interpreted to better assess uncertainties and therefore enable an efficient solution for environmental or engineering purposes.","PeriodicalId":11823,"journal":{"name":"Environmental geotechnics","volume":"14 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79655685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Universal Graphical Solution to Calculating Seepage in Excavation of Anisotropic Soils and Non-Limited Scenarios 非限制条件下各向异性土体开挖渗流计算的通用图形解

IF 2.2 4区工程技术

Environmental geotechnics Pub Date : 2023-08-02 DOI: 10.3390/geotechnics3030039

Salvador Navarro Carrasco, José Antonio Jiménez-Valera, I. Alhama

{"title":"A Universal Graphical Solution to Calculating Seepage in Excavation of Anisotropic Soils and Non-Limited Scenarios","authors":"Salvador Navarro Carrasco, José Antonio Jiménez-Valera, I. Alhama","doi":"10.3390/geotechnics3030039","DOIUrl":"https://doi.org/10.3390/geotechnics3030039","url":null,"abstract":"The interaction between groundwater and civil engineering works is a key aspect in geotechnical design. In the case of excavations confined in sheet pile walls, steel sheeting, diaphragm walls, cut-off walls, or cofferdams, this design requires the estimation, among other soil mechanics properties, of the groundwater flowing into the excavation (seepage) caused by piezometry depletion. Numerical methods, graphical solutions, and analytical procedures are the methodologies traditionally used to solve this issue, solutions of which require an understanding of basic soil mechanical properties, hydraulic conditions and structure geometry. In this work, the discriminated non-dimensionalization technique is applied to obtain, for the first time, the dimensionless groups that govern the seepage, in anisotropic conditions, in large-scale scenarios where groundwater flow is not conditioned by impervious bedrock or the length of the back of the wall: π1=ab,π2=kxb2kyc2 and, π3=T/b. Numerical simulations are carried out to check the validity of dimensionless groups and to develop three sets of type curves that relate to these groups. Once the physical and geometrical data are known, the seepage (Q), the characteristic depth (T*) and the characteristic horizontal extension (L*) can be directly and easily calculated from these abacuses. The influence of anisotropy on the characteristic lengths is also addressed.","PeriodicalId":11823,"journal":{"name":"Environmental geotechnics","volume":"69 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84255564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Editorial 社论

IF 2.2 4区工程技术

Environmental geotechnics Pub Date : 2023-08-01 DOI: 10.1680/jenge.2023.10.5.289

V. Di Battista

引用次数: 0

Landfills’ environmental impacts: perspectives on biomonitoring 垃圾填埋场的环境影响:生物监测的视角

IF 2.2 4区工程技术

Environmental geotechnics Pub Date : 2023-07-31 DOI: 10.1680/jenge.23.00003

M. Vaverková, E. Paleologos, Venkata Siva Naga Sai Goli, E. Koda, A. Mohammad, A. Podlasek, J. Winkler, Aleksandra Jakimiuk, Martin Černý, Devendra Singh

{"title":"Landfills’ environmental impacts: perspectives on biomonitoring","authors":"M. Vaverková, E. Paleologos, Venkata Siva Naga Sai Goli, E. Koda, A. Mohammad, A. Podlasek, J. Winkler, Aleksandra Jakimiuk, Martin Černý, Devendra Singh","doi":"10.1680/jenge.23.00003","DOIUrl":"https://doi.org/10.1680/jenge.23.00003","url":null,"abstract":"Environmental regulations on landfills contain detailed instructions for the monitoring of pollution from leachate on water, air, and soil. However, references to the impact of landfills on the landscape and the need to monitor the surrounding vegetation are described only in general terms. Studies have indicated that near-surface pollution events, which are not necessarily captured by existing regulatory monitoring schemes, have affected the vegetation in the vicinity of landfills. Indications for the effects of pollution emanating from landfills include the retreat of sensitive and native plant species, the abundance of halophytes or nitrophilous plants, and the prevalence of other invasive plant species, which can spread to adjacent ecosystems. To the best of the authors’ knowledge, a comprehensive synthesis of landfill plant-based biomonitoring results has not yet been reported. The advantage of biomonitoring lies in its ability to assess the quality of the environment as perceived by living organisms. This would facilitate the determination of the response of plants to departures from natural conditions, detection of trends occurring in ecosystems, and adoption of management practices to prevent or mitigate degradation of the environment. Thus, to detect such effects on the flora surrounding a landfill, this article recommends that biomonitoring is utilized in environmental regulations to complement existing monitoring techniques.","PeriodicalId":11823,"journal":{"name":"Environmental geotechnics","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43272493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Real-time monitoring of pH and dissolved oxygen during disturbances in polluted sediments 污染沉积物扰动过程中pH值和溶解氧的实时监测

IF 2.2 4区工程技术

Environmental geotechnics Pub Date : 2023-07-27 DOI: 10.1680/jenge.22.00189

C. Totland, Caroline Berge Hansen, A. Nybakk, E. Eek

{"title":"Real-time monitoring of pH and dissolved oxygen during disturbances in polluted sediments","authors":"C. Totland, Caroline Berge Hansen, A. Nybakk, E. Eek","doi":"10.1680/jenge.22.00189","DOIUrl":"https://doi.org/10.1680/jenge.22.00189","url":null,"abstract":"Remediation activities in polluted sediments, such as dredging and capping, induce the risk of transporting polluted sediments into the water column. Turbidity surveillance is the common method for in situ environmental monitoring during such activities. However, at various stages of the remediation process, the turbidity may be caused by either clean or polluted materials. Here, the potential of using chemical sensors to discriminate between turbidity caused by clean and polluted sediments is evaluated. Dissolved oxygen (DO), turbidity and pH were measured in laboratory tests with suspensions of three different polluted sediments, as well as for two common clean capping materials. Additionally, turbidity, pH and DO were measured during dredging at one of the polluted sites. Whereas turbidity caused by clean materials did not affect pH or DO, there is an inverse linear relationship between DO and turbidity for two of the polluted sediments. Furthermore, for two of the sediments, pH is a strong indicator of sediment resuspension into the water column, with ΔpH>0.5 both in the lab and during dredging in the field. Hence, pH and/or DO surveillance is shown to be potential tools for in situ real-time monitoring of environmental risk during disturbances in polluted sediments.","PeriodicalId":11823,"journal":{"name":"Environmental geotechnics","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46595385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tsunami Wave Characteristics from the 1674 Ambon Earthquake Event Based on Landslide Scenarios 基于滑坡情景的1674年安汶地震事件海啸波特征

IF 2.2 4区工程技术

Environmental geotechnics Pub Date : 2023-07-24 DOI: 10.3390/geotechnics3030038

K. Pakoksung, A. Suppasri, Fumihiko Imamura

{"title":"Tsunami Wave Characteristics from the 1674 Ambon Earthquake Event Based on Landslide Scenarios","authors":"K. Pakoksung, A. Suppasri, Fumihiko Imamura","doi":"10.3390/geotechnics3030038","DOIUrl":"https://doi.org/10.3390/geotechnics3030038","url":null,"abstract":"This study focuses on understanding the historical tsunami events in Eastern Indonesia, specifically the Banda Sea region, by extracting information from the limited and challenging-to-interpret historical records. The oldest detailed account of a tsunami in Indonesia dates back to 1674, documented in the book Waerachtigh Verhael Van de Schlickelijcke Aerdbebinge by Rumphius. The study aims to comprehend the primary source of the tsunami and analyze its characteristics to facilitate future tsunami risk reduction. The methodology includes collecting topography and bathymetry data, conducting landslide scenario analysis, employing a two-layer wave propagation model, and performing spectral analysis. The study utilizes comprehensive datasets, investigates potential landslide scenarios, simulates tsunami propagation, and analyzes frequency characteristics using the fast Fourier transform. The 1674 event yielded a runup height of approximately 50–100 m, whereas this study underestimated the actual runup. To illustrate the tsunami wave along the bay’s coastline, a Hovmöller diagram was employed. By analyzing the Hovmöller diagram, the power spectral density was computed, revealing five prominent period bands: 6.96, 5.16, 4.1, 3.75, and 3.36 min. The integration of these components provides a rigorous approach to understanding tsunami dynamics and enhancing risk assessment and mitigation in the study area.","PeriodicalId":11823,"journal":{"name":"Environmental geotechnics","volume":"13 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83587863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Analytical Study on Soil Water Index (SWI), Landslide Prediction and Other Related Factors Using XRAIN Data during the July 2018 Heavy Rain Disasters in Hiroshima, Japan 基于XRAIN数据的2018年7月日本广岛暴雨灾害土壤水分指数(SWI)、滑坡预测及相关因素分析研究

IF 2.2 4区工程技术

Environmental geotechnics Pub Date : 2023-07-21 DOI: 10.3390/geotechnics3030037

José Maria dos Santos Rodrigues Neto, N. Bhandary, Y. Fujita

{"title":"An Analytical Study on Soil Water Index (SWI), Landslide Prediction and Other Related Factors Using XRAIN Data during the July 2018 Heavy Rain Disasters in Hiroshima, Japan","authors":"José Maria dos Santos Rodrigues Neto, N. Bhandary, Y. Fujita","doi":"10.3390/geotechnics3030037","DOIUrl":"https://doi.org/10.3390/geotechnics3030037","url":null,"abstract":"The rainfall-induced landslide disasters in July 2018 in Southwestern Japan yet again exemplified the severity of slope failure-related damage and the need for improvement of early warning systems. The Japanese Meteorological Agency (JMA) uses a method based on a threshold value of soil water index (SWI), a conceptual measurement that represents saturation of slope soil. The current SWI early warning system uses 60-min rainfall data on a 5-km2 mesh and does not take into consideration other landslide conditioning factors such as slope angle and geology. This study calculates SWI values during the July 2018 disasters in Kure City (Hiroshima Prefecture) using 1-min XRAIN rainfall data in a 250-m mesh to investigate the relationship between SWI and landslide occurrence. It was found that the SWI threshold of 124 mm used in the JMA early warning system for the area was surpassed in all cells. A new SWI threshold calculation method taking slope angle and geology into consideration and produced with machine learning is proposed, comprising power lines for different geological units at a two-dimensional graph where points located above the threshold line represent landslide risk. It is judged that this method would provide a more accurate early warning system for landslide disasters.","PeriodicalId":11823,"journal":{"name":"Environmental geotechnics","volume":"27 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82864758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of New Combined Treatment Method on the Mechanical Properties and Microstructure of MICP-Improved Sand 新型复合处理方法对micp改性砂力学性能和微观结构的影响

IF 2.2 4区工程技术

Environmental geotechnics Pub Date : 2023-07-19 DOI: 10.3390/geotechnics3030036

Jude Zeitouny, W. Lieske, Arash Alimardani Lavasan, Eva Heinz, M. Wichern, T. Wichtmann

{"title":"Impact of New Combined Treatment Method on the Mechanical Properties and Microstructure of MICP-Improved Sand","authors":"Jude Zeitouny, W. Lieske, Arash Alimardani Lavasan, Eva Heinz, M. Wichern, T. Wichtmann","doi":"10.3390/geotechnics3030036","DOIUrl":"https://doi.org/10.3390/geotechnics3030036","url":null,"abstract":"Microbially induced calcite precipitation (MICP) is a green bio-inspired soil solidification technique that depends on the ability of urease-producing bacteria to form calcium carbonate that bonds soil grains and, consequently, improves soil mechanical properties. Meanwhile, different treatment methods have been adopted to tackle the key challenges in achieving effective MICP treatment. This paper proposes the combined method as a new MICP treatment approach, aiming to develop the efficiency of MICP treatment methods and simulate naturally cemented soil. This method combines the premixing, percolation, and submerging MICP methods. The strength outcomes of Portland-cemented and MICP-cemented sand using the percolation and combined methods were compared. For Portland-cemented sand, the UCS values varied from 0.6 MPa to 17.2 MPa, corresponding to cementation levels ranging from 5% to 30%. For MICP-cemented sand, the percolation method yielded UCS values ranging from 0.5 to 0.9 MPa, while the combined method achieved 3.7 MPa. The strength obtained by the combined method is around 3.7 times higher than that of the percolation method. The stiffness of bio-cemented samples varied between 20 and 470 MPa, while for Portland-cemented sand, it ranged from 130 to 1200 MPa. In terms of calcium carbonate distribution, the percolation method exhibited higher concentration at the top of the sample, while the combined method exhibited more precipitation at the top and perimeter, with less concentration in the central bottom region, equivalent to 10% of a half section’s area.","PeriodicalId":11823,"journal":{"name":"Environmental geotechnics","volume":"6 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81371128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1