检索结果-内蒙古大学图书馆

Geo-EnvironMeet 2025: Geoenvironmental Contamination and Waste Containment

作者： Dominijanni, Andrea Guarena, Nicolò Dept. of Structural Geotechnical and Building Engineering Politecnico di Torino Torino Italy

ISBN: (数字)9780784485699

Bentonite-based barriers are able to act as semipermeable membranes that partially inhibit the passage of charged solutes (i.e., ions). This behavior also induces chemico-osmosis, whereby water migrates from a location of lower solute concentration to a location of higher solute concentration. This paper explores the potential significance of chemico-osmosis on solute transport through bentonite-based barriers using a phenomenological transport approach combined with a physical model relating the macroscale transport properties, such as the reflection coefficient, ?, and the hydraulic conductivity, k, to the microscale physicochemical and fabric properties of the bentonite. The practical relevance of chemico-osmosis is illustrated through a calculation example involving a geosynthetic clay liner used as a single barrier or coupled to a geomembrane to form a composite barrier. The results indicate that the influence of chemico-osmosis is dependent upon the leachate concentration and the bentonite void ratio. Based on the available experimental data, for solute concentrations lower than 100 mM, the counterflow due to chemical osmosis is prevalent over the flow generated by the hydraulic gradient and the solute mass flow is reduced by a factor in the range from 1 to 10. © ASCE.

关键词： Osmosis

来源：评论

学校读者我要写书评

暂无评论

Computationally Efficient Simulation of Long-Term Landslide Motion Driven by Rainfall Cycles

Computationally Efficient Simulation of Long-Term Landslide ...

引用

geotechnical Frontiers 2025: Geotechnics of Natural Hazards

作者： Rollo, Fabio Buscarnera, Giuseppe Dept. of Structural and Geotechnical Engineering Sapienza Univ. of Rome Roma Italy Dept. of Civil and Environmental Engineering Northwestern Univ. EvanstonIL United States

ISBN: (数字)9780784485996

Rainfall is one of the primary causes of cyclic landslide motion, with detrimental effects on landscape and infrastructure. In this study, a computationally efficient sliding consolidation model (SCM) is presented to delineate the role played by inelastic soil deformation during rainfall cycles altering the hydromechanical conditions of the landslide shear zone. The model allows the incorporation of soil constitutive laws able to quantify the 3D stress changes during rainfall. As a result, it enables to simulate the onset of failure and consequent movements during hydrologic cycles. By modelling the shear zone as a perfectly plastic frictional solid, the model shows that the evolution of the stress state can lead to different regimes of motion, in some cases, characterized by a transition from a stable creep-like behavior to a rapid increase in velocity. We also find that the transition between these regimes is intimately related to the magnitude and duration of the hydrologic forcing and the initial in situ stress conditions. © ASCE.

关键词： Landslides

来源：评论

学校读者我要写书评

暂无评论

Efficient Uncertainty Quantification in Seismic Site Response via Random Field Modeling

Efficient Uncertainty Quantification in Seismic Site Respons...

引用

geotechnical Frontiers 2025: Geotechnics of Natural Hazards

作者： Chala, Ayele Ray, Richard Structural and Geotechnical Engineering Dept. Faculty of Architecture Civil and Transport Sciences Szechenyi Istvan Univ. Gyor Hungary

ISBN: (数字)9780784485996

Assessing seismic site response with absolute certainty remains challenging due to inherent soil variabilities. Soil variabilities primarily stem from natural geologic processes and lie beyond human control. Soil characteristics, including shear wave velocity, shear modulus, unit weight, and plasticity, exhibit inherent randomness and variability. These factors significantly influence seismic site responses, making it crucial to account for parameter uncertainty in seismic behavior characterization. Precisely characterizing this uncertainty is essential for reliable seismic hazard assessment and the design of earthquake-resistant structures. However, this task faces challenges due to the computational expense associated with many model realizations. In this study, a computationally efficient and user-friendly model for estimating peak ground acceleration (PGA), displacement (PGD), and quantifying uncertainty was developed. The methodology comprises two main steps: (1) 2D equivalent linear seismic site response analyses were simulated using MIDAS GTS NX commercial software. These simulations incorporated randomly generated properties of clay soil, including maximum shear modulus (G0), unit weight (γ), and plasticity index (PI). (2) Leveraging data from the site response analyses, a Bayesian regression model was developed using the R programming language. The accuracy and reliability of the developed model were validated using a new data set, and the results closely aligned with finite element method (FEM) outcomes. By accounting for soil inherent variabilities, the model effectively characterizes the uncertainty of PGA and PGD using mean and coefficient of variation (CoV). Remarkably, the Bayesian approach yielded CoV of response parameters up to 2.33%, a substantial 94.37% relative difference compared to the FEM. Notably, this improvement in uncertainty was achieved while maintaining computational efficiency. © ASCE.

关键词： Shear strain

来源：评论

学校读者我要写书评

暂无评论

Experimental study on the combined influence of geogrid and rubber granules on the shear behavior of railway ballast

引用

Granular Matter 2025年第3期27卷 1-13页

作者： Yan, Zihan Chen, Jing Hu, Qihang Li, Chang Gao, Rui The Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province School of Civil Engineering Wuhan University Wuhan430072 China Transport Research Centre Faculty of Engineering and Information Technology University of Technology Sydney SydneyNSW2007 Australia Dept. of Civil Engineering Zhejiang Univ. Hangzhou310000 China

Geogrid is one of the most widely used geoinclusions in railway engineering to improve the bearing capacity of ballasted tracks. However, its effectiveness in mitigating ballast degradation, recognized as the most critical engineering challenge, remains limited, particularly in the context of the increasing demand for faster and heavier haul transportation nowadays. Rubber granules (RG), manufactured from waste rubber tires, possess high energy-absorbing properties that dampen vibration, reducing the stresses on ballast particles and helping to prevent ballast degradation. In order to explore the practical methods to delay the degradation of ballast and improve the performance of track bed, in this study, a series of large-scale direct shear tests were conducted on ballast aggregates with different geogrid-inclusion conditions and various RG content to investigate the shear behavior and performance of ballast under different configurations. The results show that while the RG effectively reduces the breakage of ballast particles, it negatively impacts the development of shear strength in aggregates, with or without geogrid reinforcement. As RG content increases, ballast aggregate exhibits lower peak shear strength, smaller maximum volumetric dilation, and greater volumetric contraction during shearing. For geogrid-reinforced ballast, incorporating 5% rubber granules (by volume) results in a reduction of aggregate shear strength by approximately 12%, while simultaneously mitigating ballast breakage by more than 30%. By balancing the enhancement of ballast durability with the maintenance of adequate shear strength, a 5% RG content by volume is recommended as a suitable proportion for practical applications. Based on experimental observations, a set of empirical equations has been proposed to estimate the shear strength and volumetric deformation of geogrid-reinforced ballast in the presence of RG. The findings from this study provide valuable insights for improving the

关键词： Shear strength

来源：评论

学校读者我要写书评

暂无评论

The Impact of Temperature and Pressure on the Efficiency of CH 4 Replacement in CO 2-Injected Coal

引用

Journal of Energy engineering 2025年第4期151卷

作者： Ren, Fake Wang, Chongyang Pan, Yisha Zhang, Yu Xiong, Ziyang Pourfatollah, Amirreza State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing Univ Chongqing400030 China School of Resources and Safety Engineering Chongqing Univ Chongqing400044 China School of Public Administration China Univ. of Mining and Technology Xuzhou221116 China Dept. of Structural Geotechnical and Building Engineering Politecnico di Torino Turin10129 Italy

This study examines the effects of temperature (T), CO2 injection pressure (P0), and initial CH4 adsorption equilibrium pressure (P1) on the CH4 replacement rate (η) following CO2 injection into anthracite coal. Using experimental data on the CH4 replacement rate under varying conditions, a response surface methodology (RSM) was applied to evaluate the individual and interactive influences of these parameters on the CH4 replacement process. The results demonstrate that the CH4 replacement rate increases with both temperature and CO2 injection pressure but decreases with higher initial CH4 adsorption equilibrium pressure. Furthermore, the sensitivity of the CH4 replacement rate to the individual factors is ordered as P1>P0>T. The interaction effects between two factors are ranked as follows: {P1 and P0}>{P1 and T}>{P0 and T}. These findings provide valuable insights for optimizing CO2-ECBM technology and refining operational parameters. © 2025 American Society of Civil Engineers.

关键词： Surface temperature

来源：评论

学校读者我要写书评

暂无评论

Seismic risk assessment of natural gas networks at the urban scale

引用

International Journal of Disaster Risk Reduction 2025年 126卷

作者： Alessandro Cardoni Amir Reza Elahi Gian Paolo Cimellaro Dept. of Structural Geotechnical and Building Engineering Politecnico di Torino Corso Duca degli Abruzzi 24 Turin 10129 Italy

Modern societies have shown to be heavily dependent on critical infrastructures, which provide essential services and contribute significantly to social and economic evolution. The natural gas network plays a crucial role in a post-disaster event and, if damaged, it can have a severe impact on recovery and ultimately on community resilience. This paper focuses on the evaluation of the seismic risk of urban natural gas networks. A physical-based model is developed to simulate the effects of pipeline damage induced by the ground shaking and soil deformation. The gas network modeling, calibration, and flow updating are automated through a python-based simulation tool. The proposed analysis allows to estimate network damage in terms of gas leaks and pipe breaks. In addition to the inherent vulnerability of the pipelines, the dependency to the built environment is considered by removing network components that are located inside buildings completely damaged. This information is then used to identify branches that are possibly out of service and to quantify the risk in terms of users not supplied. The methodology provides an effective tool to identify the gas network vulnerabilities at the urban level and to further study countermeasures that can overall improve community resilience.

关键词： Gas network Seismic vulnerability Physical-based model Large-scale simulation Infrastructure interdependencies NG natural gas IM intensity measure PGV peak ground velocity PGD permanent ground displacement PGA peak ground acceleration M/R metering and reduction MOP maximum operating pressure MP medium pressure RG reduction group IRS intermediate reduction system FRG final reduction group IRG industrial reduction group DS damage state RR repair rate

来源：评论

学校读者我要写书评

暂无评论

Using particle elements to model the Torino subsoil mechanical behaviour to improve the applicability of microtunnelling technique

Using particle elements to model the Torino subsoil mechanic...

引用

12th International Conference on Computer Methods and Advances in Geomechanics 2008

作者： Barla, M. Camusso, M. Dept. of Structural and Geotechnical Engineering Politecnico di Torino Italy

ISBN: (纸本)9781622761760

This paper describes a research project being carried out at the Politecnico di Torino with the main purpose of improving the applicability of microtunnelling in the metropolitan area of Torino by producing useful tools for the estimation of the jacking forces required by the microtunneller and the pipeline to advance into the ground. The subsoil conditions in the city are characterised by a sand and gravel deposit, locally cemented, due to calcareous deposition processes. Undisturbed sampling is difficult if not impossible to undertake therefore investigations on the subsoil conditions for geotechnical characterisation and evaluation of design parameters need to rely on indirect methods. With the intent to seek for a relationship between jacking forces and the degree of cementation in the ground, a discrete numerical code, able to simulate the granular nature of the soil, was used. The paper will show results on the calibration process of the numerical model. Based on these results, the paper will describe a number of numerical simulations of microtunnel installations through several models of the ground, each of them characterised by a different randomly distributed cementation degree. This will allow one to gain insights into the applicability of microtunnelling in the Torino subsoil.

关键词： Numerical models

来源：评论

学校读者我要写书评

暂无评论

Performance of large homogeneous earth dams during strong ground motions 19

Performance of large homogeneous earth dams during strong gr...

引用

19th International Conference on Soil Mechanics and geotechnical engineering, ICSMGE 2017

作者： Masini, Luca Rampello, Sebastiano Dept. Of Structural and Geotechnical Engineering Sapienza University of Rome Italy

This paper discusses some aspects of the seismic behaviour of large homogeneous earth dams. Numerical analyses were carried out using a plane-strain finite difference model of an existing dam that has been calibrated using the monitoring data taken during the construction and the impoundment stages. The seismic performance of the dam was evaluated through a series of nonlinear dynamic analyses carried out in the time-domain using four real seismic records applied at the base of the model. The selected input motions are characterised by the same energy content and by a very high return period. Both the horizontal and the vertical component of the seismic action were applied at the base of the grid. In calculations, cyclic excess pore water pressure build-up was accounted for using the Finn-Byrne model. The seismic response of the dam is discussed showing the effects of input motion characteristics and of excess pore water pressure induced by earthquake loading on the maximum permanent settlement developed at the crest, that may be seen as an index of the seismic performance of the dam. © 2017 CEUR-WS. All rights reserved.

关键词： Pressure distribution

来源：评论

学校读者我要写书评

暂无评论

Experiences from L'Aquila 2009 earthquake 3

Experiences from L'Aquila 2009 earthquake

引用

3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference 2010

作者： Menegotto, Marco Dept. of Structural and Geotechnical Engineering Sapienza University of Rome Italy

ISBN: (纸本)9780937040904

The features of the earthquake, which hit the town of L'Aquila, Italy, in April 2009, its overall effects on the densely inhabited area, the typical buildings existing in the area, the construction types, the past and present concepts overlooked in design, construction and use are pointed out, that led to the damages;in brief, the lesson that one can learn from the sad event. A great variety of buildings were present, ranging from medieval stone-masonry heritage monuments and dwellings to modern concrete buildings. Accordingly, their response was quite different. Some remained perfectly inhabitable, including those that were able to host the G8 summit meetings less than two months later. Other collapsed and resulted in casualties. Particular attention is paid to precast concrete structures, all rather recent and mostly fitting industrial and shopping buildings, whose behaviour in the actual circumstances is analysed. Although none of them collapsed nor caused casualties, some underwent considerable damage, requiring significant repair that has impaired or stopped productive activity for quite a time. Kinds and causes of such lack in performance are shown. How emergency and post-emergency were effectively faced is also described.

关键词： Precast concrete

来源：评论

学校读者我要写书评

暂无评论

Monitoring geotechnical structures by ground based radar interferometry 7

Monitoring geotechnical structures by ground based radar int...

引用

7th International Conference on structural Health Monitoring of Intelligent Infrastructure, SHMII 2015

作者： Barla, M. Antolini, F. Dept. of Structural Building and Geotechnical Engineering Politecnico di Torino Italy

This paper describes two novel remote sensing techniques based on radar sensors, respectively the Synthetic Aperture Radar (SAR) and the Real Aperture Radar (RAR), and some applications to relevant geotechnical problems with the aim to demonstrate the outcomes these types of sensors can provide. The case studies here described show how the SAR technique can provide useful information to interpret landslides' kinematics and how the RAR can be used to monitor dam displacements and tunnels' convergences. © 2015, International Society for structural Health Monitoring of Intelligent Infrastructure, ISHMII. All rights reserved.

关键词： Synthetic aperture radar

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：