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Micromechanical modeling of long-term creep behavior of quasi-brittle rocks considering thermo-mechanical coupling effects 考虑热-力耦合效应的准脆性岩石长期蠕变行为细观力学模拟
IF 3.7 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2026-03-01 Epub Date: 2025-12-20 DOI: 10.1016/j.gete.2025.100782
Boran Huang , Jin Zhang , Qi-Zhi Zhu , Lunyang Zhao , Sili Liu
A temperature-dependent micromechanical creep–damage constitutive model is proposed within the framework of irreversible thermodynamics and homogenization theory to investigate the long-term thermo-mechanical behavior of quasi-brittle rocks. The model explicitly couples frictional sliding and microcrack propagation as the dominant modes of energy dissipation, where the friction coefficient, critical damage resistance, and damage threshold are expressed as temperature-dependent functions. Subcritical crack growth is incorporated to capture time-dependent damage accumulation and strain development. Model validation is conducted against triaxial thermo-creep experiments on gneissic granite, deep coals, and Beishan granite. The simulations reproduce the complete creep evolution – primary, secondary (steady-state), and tertiary (accelerated) stages – with relatively few parameters. The results clarify the role of creep rate—controlling factors, reveal the mechanisms of damage evolution and strain-rate acceleration under elevated temperatures, and demonstrate the promoting effect of thermal loading on energy dissipation. This unified framework not only advances the understanding of rock creep under coupled thermal–mechanical fields but also provides a theoretical basis for assessing the long-term thermal stability and reliability of deep underground engineering structures.
在不可逆热力学和均质化理论的框架下,提出了一种温度相关的微力学蠕变损伤本构模型,研究了准脆性岩石的长期热-力学行为。该模型明确耦合摩擦滑动和微裂纹扩展作为能量耗散的主要模式,其中摩擦系数、临界损伤抗力和损伤阈值表示为温度相关函数。亚临界裂纹扩展被纳入捕捉随时间的损伤积累和应变发展。通过对麻质花岗岩、深部煤和北山花岗岩的三轴热蠕变试验对模型进行了验证。该模拟以相对较少的参数再现了完整的蠕变演化过程——初级、二级(稳态)和三级(加速)阶段。研究结果明确了蠕变速率控制因素的作用,揭示了高温下损伤演化和应变速率加速的机理,并论证了热载荷对能量耗散的促进作用。这一统一框架不仅促进了对热-力耦合作用下岩石蠕变的认识,而且为深部地下工程结构的长期热稳定性和可靠性评价提供了理论依据。
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引用次数: 0
A unified Element-based Finite Volume Method for linear and nonlinear geomechanics and compositional reservoir simulation 线性和非线性地质力学及储层模拟的统一有限元有限体积法
IF 3.7 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2026-03-01 Epub Date: 2026-01-14 DOI: 10.1016/j.gete.2026.100791
Marcelo Menezes Farias , Ivens da Costa Menezes Lima , Francisco Marcondes , Kamy Sepehrnoori
This work presents an unstructured grid-based formulation for compositional reservoir simulation coupled with elastic, elastoplastic, and viscoplastic geomechanical models. Implemented in the UTCOMPRS simulator using the Element-based Finite Volume Method (EbFVM), the proposed approach explicitly solves both flow and mechanical equations on unstructured grids. It supports nonlinear models, such as Mohr-Coulomb, Drucker-Prager, and a Perzyna-based viscoplastic criterion to represent material yield. Five case studies are conducted to verify the geomechanical implementation: Prandtl’s benchmark validates the plastic and viscoplastic models; primary production matched results from a commercial simulator; WAG injection and CO2 storage cases demonstrated the influence of the geomechanical model on production forecast, reservoir pressure, and rock deformation; and a Pre-Salt reservoir proxy tested computational efficiency, and numerical accuracy of the EbFVM across multiple grid refinements. Results show that the EbFVM captures nonlinear deformation while delivering solutions comparable to fine meshes using significantly coarser grids. The proposed formulation provides a robust and versatile tool for simulating complex reservoir-geomechanical problems.
这项工作提出了一种基于非结构化网格的组合储层模拟公式,结合了弹性、弹塑性和粘塑性地质力学模型。采用基于单元的有限体积法(Element-based Finite Volume Method, EbFVM)在UTCOMPRS模拟器中实现,该方法明确地求解了非结构化网格上的流动方程和力学方程。它支持非线性模型,如Mohr-Coulomb, Drucker-Prager和基于perzyna的粘塑性标准来表示材料产量。五个案例研究验证了地质力学的实现:Prandtl的基准验证了塑性和粘塑性模型;商业模拟器的初步生产匹配结果;WAG注入和CO2封存实例证明了地质力学模型对产量预测、储层压力和岩石变形的影响;以盐下储层为例,测试了EbFVM在多种网格细化下的计算效率和数值精度。结果表明,EbFVM可以捕获非线性变形,同时使用更粗糙的网格提供与精细网格相当的解决方案。所提出的公式为模拟复杂的储层地质力学问题提供了一个强大而通用的工具。
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引用次数: 0
Modeling fracture growth for EGS in foreland sedimentary basins 前陆沉积盆地EGS裂缝发育模拟
IF 3.7 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2026-03-01 Epub Date: 2026-01-29 DOI: 10.1016/j.gete.2026.100796
Stephen Pansino, Manuel A. Florez, Rafael Torres
Hydraulic fractures propagate in a form that depends on the forces acting on it, including the elastic forces of the rock, the viscous forces of the liquid, and the driving pressure gradient. Rock layering also needs to be accounted for, in which the rock properties can cause sharp changes in these forces. These factors influence the resulting surface area of a fracture, and therefore in the case of EGS, the ultimate productivity of a plant. The rising importance of EGS, and associated costs of drilling, bring a need for high quality models of fracture propagation, in order to assess plant productivity beforehand. We numerically simulate fracture propagation for a field site in the Llanos basin in Colombia, which has a monzogranite basement rock and overlying layers of sandstone and mudstone. We vary the fracture dip between models and keep the other parameters (material properties, injection rate, etc.) constant. Horizontally dipping fractures propagate radially and maintain a circular, penny-shape. Fractures with greater dips become vertically elongated due buoyancy forces, driving the propagation upwards. Fractures that propagate into overlying (softer) rock layers respond by reducing in horizontal breadth. We then assess the heat conduction into the fractures using 3D finite element modeling. Steeply-dipping fractures have larger surface areas (favorable for heat capture), but also propagate upwards into cooler rock. Horizontal fractures have smaller surface areas but remain at depth, in contact with hotter rock. There is a trade-off between these competing factors, so that fractures with dips of 30° maximize the heat capture. For the extensional tectonic environment of this site, we argue that a vertical fracture is likeliest to form. Therefore, in order for an EGS plant to be sufficiently productive, we recommend drilling an injection well that is deep enough to account for the upwards propagation of such a fracture, around 4 km depth.
水力裂缝的扩展形式取决于作用于其上的力,包括岩石的弹性力、液体的粘性力和驱动压力梯度。岩石分层也需要考虑在内,因为岩石的性质会导致这些力的急剧变化。这些因素会影响裂缝的表面积,因此在EGS的情况下,会影响工厂的最终产能。EGS的重要性日益提高,钻井成本也越来越高,因此需要高质量的裂缝扩展模型,以便提前评估工厂的产能。本文对哥伦比亚Llanos盆地某油田的裂缝扩展进行了数值模拟,该油田基底为二长花岗岩,上覆砂岩和泥岩。我们改变不同模型的断裂倾角,并保持其他参数(材料性能、注射速度等)不变。水平倾斜裂缝呈放射状扩展,并保持圆形、便士状。由于浮力的作用,倾角较大的裂缝垂直拉长,推动裂缝向上扩展。裂缝扩展到上覆(较软)岩层的反应是减少水平宽度。然后,我们使用三维有限元建模来评估热传导到裂缝中的情况。陡峭倾斜的裂缝具有较大的表面积(有利于热捕获),但也向上延伸到较冷的岩石中。水平裂缝的表面积较小,但仍在深部,与较热的岩石接触。这些竞争因素之间存在权衡,因此倾角为30°的裂缝可以最大限度地捕获热量。根据该遗址的伸展构造环境,我们认为最有可能形成一条垂直裂缝。因此,为了使EGS工厂具有足够的产能,我们建议钻一口足够深的注入井,以适应裂缝的向上扩展,深度约为4 km。
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引用次数: 0
A multi-method integration approach for determining draw angles in underground metal mining: A case study of the kuogeshaye gold mine 地下金属开采角度确定的多方法集成方法——以郭格沙耶金矿为例
IF 3.7 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2026-03-01 Epub Date: 2025-12-11 DOI: 10.1016/j.gete.2025.100777
Jiahui Tian , Ruiyang Bi , Jian Zhou , Zupu Xuan , Kun Du
Accurate determination of the draw angle is critical for defining surface subsidence boundaries and ensuring the safety of surface infrastructure during mining operations. To overcome the limitations of single-method approaches, this study proposes a multi-method integration framework. Using the Kuogeshaye Gold Mine as a case study, the framework effectively combines theoretical calculation, particle swarm optimization–support vector machine prediction, and numerical simulation. The maximum relative error between the results achieved using the three methods was only 5.1 %. Additionally, an analytic hierarchy process-based weighted fusion strategy was used to integrate the results from the three methods, yielding a more reliable determination. The final draw angles were 73.5° and 74.7° for a hanging wall and footwall, respectively. Engineering applications demonstrated that this method significantly enhanced the accuracy of surface subsidence zone-boundary delineation, offering a transferable methodology for determining the rock draw angle and ensuring safe mining in deep mines.
准确确定地表倾角对于确定地表沉陷边界、保障地表基础设施安全是至关重要的。为了克服单一方法方法的局限性,本研究提出了一个多方法集成框架。以Kuogeshaye金矿为例,该框架有效地将理论计算、粒子群优化-支持向量机预测和数值模拟相结合。三种方法测定结果的最大相对误差仅为5.1% %。此外,采用基于层次分析法的加权融合策略对三种方法的结果进行综合,得到更可靠的结果。上盘和下盘的最终抽采角度分别为73.5°和74.7°。工程应用表明,该方法显著提高了地表沉陷带边界圈定的精度,为确定深部矿山岩层倾角、保障矿山安全开采提供了一种可转移的方法。
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引用次数: 0
A unified thermo–hydro–mechanical load-transfer framework for energy piles: Quantifying interfacial softening 能源桩热-水-机械统一荷载传递框架:界面软化量化
IF 3.7 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2026-03-01 Epub Date: 2026-02-26 DOI: 10.1016/j.gete.2026.100810
Tuan A. Pham , Sadegh Nadimi , Melis Sutman
Energy piles, which serve concurrently as structural foundations and ground source heat exchangers, exhibit complex, coupled thermo-hydro-mechanical (THM) load-transfer responses that are often poorly predicted by conventional models. Current methodologies predominantly simplify the interaction, focusing primarily on temperature-induced pile expansion while overlooking crucial changes in the surrounding soil properties and interface behaviour. This paper presents a novel, unified load-transfer approach designed to accurately capture the nonlinear, multi-factor performance of energy piles embedded in multi-layered soils. The model's uniqueness lies in the simultaneous incorporation of advanced constitutive relationships that account for the temperature dependence of key geotechnical parameters, including thermal expansion/shrinkage of pile materials, radial thermal stress, total stress, particle contact area ratio, pore-water pressure, internal friction angle, effective cohesion, overconsolidation ratio, and suction stress. This framework explicitly integrates the effects of thermal softening of the soil skeleton and the generation of thermally induced excess pore-water pressure. The complex non-linear equilibrium is solved using an iterative Neutral Plane (NP) procedure to precisely determine the distribution of axial forces and skin friction. The predictive capability of the model is rigorously validated against three distinct full-scale field tests across diverse soil types: sandy silts, granular soils, and high-plasticity clays. Results show that the proposed method achieves high accuracy, with an average relative error ranging from 3% to 8.2% across all validation cases. Crucially, the analysis demonstrates that thermal effects significantly decrease or increase interface resistance depending on site characteristics, an observation that cannot be replicated when only pile expansion is considered. This work provides a robust, physics-based predictive tool essential for mitigating design risks associated with THM coupling, advancing the safe and efficient integration of geothermal energy systems into foundational engineering practice.
能源桩同时作为结构基础和地源热交换器,表现出复杂的,耦合的热-水-机械(THM)负载传递响应,通常是传统模型难以预测的。目前的方法主要简化了相互作用,主要关注温度引起的桩扩展,而忽略了周围土壤性质和界面行为的关键变化。本文提出了一种新的、统一的荷载传递方法,旨在准确地捕捉嵌入多层土壤中的能量桩的非线性、多因素性能。该模型的独特之处在于同时结合了先进的本构关系,考虑了关键岩土参数的温度依赖性,包括桩材料的热膨胀/收缩、径向热应力、总应力、颗粒接触面积比、孔水压力、内摩擦角、有效黏聚力、超固结比和吸力应力。该框架明确整合了土骨架的热软化效应和热诱导的超孔隙水压力的产生。采用迭代中立面法求解复杂的非线性平衡,精确确定轴向力和表面摩擦力的分布。该模型的预测能力通过三种不同的全尺寸现场测试进行了严格验证,这些测试涉及不同的土壤类型:沙质粉砂、颗粒土和高塑性粘土。结果表明,该方法具有较高的准确率,在所有验证案例中,平均相对误差在3% ~ 8.2%之间。至关重要的是,分析表明,热效应会显著降低或增加界面阻力,这取决于场地特征,这一观察结果在仅考虑桩的膨胀时是无法复制的。这项工作提供了一个强大的、基于物理的预测工具,对于降低与THM耦合相关的设计风险至关重要,促进了地热能源系统与基础工程实践的安全高效集成。
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引用次数: 0
Discussion of “Assessment of an amended soil as a climate adaptive barrier: Element testing and physical modelling” “作为气候适应屏障的改良土壤的评估:元素测试和物理模型”的讨论
IF 3.7 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2026-03-01 Epub Date: 2025-12-25 DOI: 10.1016/j.gete.2025.100784
Vishnu Gopakumar, Bharat Venkata Tadikonda
This discussion examines methodological and interpretative aspects of “Assessment of an amended soil as a climate adaptive barrier: element testing and physical modelling” by Rana et al., emphasizing critical insights for enhancing barrier reliability. Key concerns include the potential for measurement errors arising from delayed hydraulic response and equilibration protocols associated with tensiometer and ceramic sensor techniques. These issues cause significant disparities in soil water characteristic curve (SWCC) and hydraulic conductivity results. The discussion highlights that breakthrough mechanisms in fine-textured, water treatment residual (WTR) amended soils are best characterized by suction equilibrium rather than hydraulic conductivity convergence, aligning with recent research on capillary barrier systems. Environmental and long-term durability factors are discussed, including the implications of organic matter degradation, vegetation compatibility, and atmospheric drying cycle effects. The verification of sensor response times and long-term assessment are recommended to improve the robustness and utility of WTR-based climate adaptive barriers.
本讨论探讨了Rana等人的“作为气候适应性屏障的改良土壤评估:元素测试和物理建模”的方法和解释方面,强调了提高屏障可靠性的关键见解。关键问题包括延迟液压响应和与张力计和陶瓷传感器技术相关的平衡协议所引起的测量误差的可能性。这些问题导致土壤水分特征曲线(SWCC)和导水系数结果存在显著差异。讨论强调,细结构水处理残留物(WTR)修正土壤的突破机制最好是通过吸力平衡而不是水力导电性收敛来表征的,这与最近对毛细屏障系统的研究一致。讨论了环境和长期耐久性因素,包括有机质降解、植被兼容性和大气干燥循环效应的影响。建议对传感器响应时间进行验证和长期评估,以提高基于wtr的气候适应屏障的鲁棒性和实用性。
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引用次数: 0
Cracking patterns, self-healing and properties of sand-bentonite liner under environmental stresses: A CT scanning and laboratory testing approach 环境应力下砂-膨润土衬垫的开裂模式、自修复和性能:CT扫描和实验室测试方法
IF 3.7 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2026-03-01 Epub Date: 2026-01-03 DOI: 10.1016/j.gete.2026.100786
Mina Fattahi, Reza Imam
Compacted Impervious Liners (CILs) play a critical role in landfills by preventing environmental pollution. Where local soils do not meet stringent design criteria, soil amendment with bentonite is widely adopted to enhance properties of CILs. This study focuses on examining the behavior of a typical sand-bentonite mixture used as CIL and investigating the cracking patterns, self-healing properties in terms of hydraulic conductivity and uniaxial strength under wet-dry and freeze-thaw cycles, and effects of bentonite type and percentage on these properties. CT scanning and image processing results showed that in higher plasticity mixtures containing more sodium bentonite, cracks formed during wet-dry cycles tend to be larger and surficial; however, following freeze-thaw cycles, they are thinner, shorter and distributed uniformly over the sample depth. In the lower plasticity calcium bentonite mixtures, the cracking patterns during the two types of environmental stresses are reversed. Moreover, three patterns of changes in hydraulic conductivity and self healing during wet-dry cycles depending on the bentonite type of the mixture are also identified. Possible explanations for the cracking and self-healing observations are also provided. Effects of bentonite type and mixture plasticity on the various mixture properties including strength, stiffness, post-peak softening rate, failure mechanism, hydraulic conductivity, compaction properties, etc. are also examined. It was noticed that for the low PI mixture, wet-dry cycles finally lead to either increase or decrease in hydraulic conductivity depending on the mixture density.
压实防渗衬垫(CILs)在垃圾填埋场中起到了防止环境污染的重要作用。在当地的土壤不符合严格的设计标准,土壤改良剂与膨润土被广泛采用,以提高混凝土的性能。本研究的重点是研究一种典型的砂-膨润土混合物作为CIL的行为,研究其在干湿循环和冻融循环下的开裂模式、水力导电性和单轴强度方面的自愈性能,以及膨润土类型和百分比对这些性能的影响。CT扫描和图像处理结果表明,在含钠型膨润土较多的高塑性混合料中,干湿循环过程中形成的裂纹往往较大且较浅;然而,在冻融循环之后,它们变得更薄、更短,并且在样品深度上分布均匀。在低塑性钙膨润土混合物中,两种环境应力作用下的开裂模式是相反的。此外,根据混合物的膨润土类型,还确定了干湿循环过程中水力导电性和自愈性的三种变化模式。对裂缝和自愈现象的可能解释也提供了。研究了膨润土类型和混合料塑性对混合料强度、刚度、峰后软化率、破坏机制、导电性、压实性等性能的影响。值得注意的是,对于低PI混合物,干湿循环最终会导致导电性的增加或减少,这取决于混合物的密度。
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引用次数: 0
Effects of pore pressure-dependent friction laws on supershear earthquakes 孔隙压力相关摩擦规律对超剪切地震的影响
IF 3.7 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2026-03-01 Epub Date: 2026-01-05 DOI: 10.1016/j.gete.2026.100787
Sandro Andrés , David Santillán , Ruben Juanes , Luis Cueto-Felgueroso
Supershear earthquakes are a particular class of seismic events in which the rupture velocity exceeds the shear wave velocity. These high-speed ruptures challenge conventional fault mechanics and have significant implications for the assessment of seismic hazards. This work investigates the relationship between pore pressure-dependent friction laws and the propagation of seismic ruptures, particularly the transition to supershear speeds. We present a numerical approach that couples fluid flow, rock deformation, and frictional contact, using stress-rate-dependent rate-and-state friction laws to simulate fault reactivation and rupture propagation. Our simulations demonstrate that the dependence of frictional properties on the effective normal stress rate can partially explain the occurrence of supershear ruptures, leading to a transition from sub-Rayleigh to supershear propagation patterns, as opposed to classical rate-and-state laws. We perform a parametric sweep, varying confining stresses, tectonic ratio, and fluid compressibility, and perform a dimensionless analysis to quantify the impact of hydromechanical parameters on supershear ruptures. Our analysis reveals that the stress drop during rupture is a key parameter in distinguishing between sub-Rayleigh and supershear rupture regimes. This study contributes to understanding the mechanisms that control fault friction behavior and its impact on seismic risk in underground reservoirs, which is crucial for the safe implementation of technologies such as green hydrogen storage and geothermal energy.
超剪切地震是破裂速度超过横波速度的一类特殊地震事件。这些高速断裂挑战了传统的断层力学,对地震危险性评估具有重要意义。这项工作研究了孔隙压力相关摩擦定律与地震破裂传播之间的关系,特别是过渡到超剪切速度。我们提出了一种耦合流体流动、岩石变形和摩擦接触的数值方法,使用与应力速率相关的速率和状态摩擦定律来模拟断层的再激活和破裂扩展。我们的模拟表明,摩擦特性对有效法向应力速率的依赖可以部分解释超剪切破裂的发生,导致从亚瑞利到超剪切传播模式的转变,而不是经典的速率-状态定律。我们进行了参数扫描、改变围应力、构造比和流体压缩性,并进行了无量纲分析,以量化流体力学参数对超剪切破裂的影响。分析表明,破裂过程中的应力降是区分亚瑞利破裂和超剪切破裂的关键参数。该研究有助于理解断层摩擦行为的控制机制及其对地下储层地震风险的影响,这对绿色储氢和地热能等技术的安全实施至关重要。
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引用次数: 0
Geotechnical performance index to validate landfill cover efficiency: Cleaner production and circular economy in the Brazilian semi-arid region 验证垃圾填埋场覆盖效率的岩土性能指标:巴西半干旱地区的清洁生产和循环经济
IF 3.7 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2026-03-01 Epub Date: 2026-01-25 DOI: 10.1016/j.gete.2026.100795
Felipe Firmino Diniz , Jordan Carneiro Martins de Souza , Pabllo da Silva Araujo , Tuilly de Fátima Furtado Guerra , Rejane Nascentes , Luiz Moreira Coelho Junior , Veruschka Escarião Dessoles Monteiro , Márcio Camargo de Melo
The efficiency of landfill cover layers in gas retention is vital to mitigate environmental impacts, reduce biogas modeling uncertainties, and promote resource circularity and low-carbon transitions. This study applies the Geotechnical Performance Index (GPI) to evaluate the spatial relationship between geotechnical properties and greenhouse gas (GHG) emissions in a landfill in northeastern Brazil. The data was obtained through laboratory testing of the soil from the site, in situ testing at 21 points in the cover layer and physical-mechanical characterization of the soil. The GPI included parameters such as moisture (w), degree of compaction (C), dry density (γd), void ratio (e), porosity (n) and degree of saturation (S). Interpolate the data using QGIS®, I'Moran to analyze the spatial correlation and Global Warming Potential (GWP) analyzes. The CH4 concentrations, of the 21 points analyzed, 95 % registered average values of less than 4 % v/v. The main CO2 hotspot had a flow of > 300 g.m−2.d−1, while for CH4 it was 39 g.m−2.d−1. The GPI was suitable for assessing the efficiency of the landfill cover layer, showing positive spatial correlations with CO2 (Moran's I = 0.105) and CH4 (Moran's I = 0.064) fluxes. Under conservative, moderate and optimistic carbon-pricing scenarios (CO2-eq), annual revenue estimates amounted to USD 63,285, USD 189,855 and USD 632,850, respectively, which highlights the economic leverage of methane-oriented interventions. The contributions demonstrate that landfill cover performance arises from coupled geotechnical, environmental, and biogeochemical interactions; targeted interventions can therefore elicit integrated responses and strengthen decision-making for landfill management and climate change mitigation.
垃圾填埋场覆盖层的气体保留效率对于减轻环境影响、减少沼气模型的不确定性、促进资源循环和低碳转型至关重要。本研究应用岩土性能指数(GPI)对巴西东北部某垃圾填埋场岩土性能与温室气体(GHG)排放的空间关系进行了评价。这些数据是通过对现场土壤的实验室测试、覆盖层21个点的现场测试和土壤的物理力学表征获得的。GPI包括含水率(w)、压实度(C)、干密度(γd)、孔隙率(e)、孔隙率(n)和饱和度(S)等参数。使用QGIS®、I’moran对数据进行插值,分析空间相关性和全球变暖潜势(GWP)分析。分析的21个点中,95 %的CH4浓度平均值小于4 % v/v。主要的CO2热点流量为>; 300 g.m−2。而CH4为39 g.m−2.d−1。GPI与CO2 (Moran’s I = 0.105)和CH4 (Moran’s I = 0.064)通量呈空间正相关,适于评价填埋场覆盖层的效率。在保守、适度和乐观的碳定价情景(二氧化碳当量)下,年收入估计分别为63,285美元、189,855美元和632,850美元,这凸显了以甲烷为导向的干预措施的经济杠杆作用。研究表明,垃圾填埋场覆盖性能是由岩土、环境和生物地球化学相互作用引起的;因此,有针对性的干预措施可以引发综合反应,并加强垃圾填埋场管理和减缓气候变化的决策。
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引用次数: 0
A novel analytical approach for evaluating thermally active underground retaining walls 一种新的热活动地下挡土墙评价分析方法
IF 3.7 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2026-03-01 Epub Date: 2026-02-26 DOI: 10.1016/j.gete.2026.100812
Aakash Gupta , Fleur Loveridge , Ida Shafagh , Simon J. Rees
Shallow geothermal energy is a promising renewable technology for sustainable indoor heating and cooling. One method to exploit this energy is through Energy Geostructures, where structural elements embedded in the ground are thermally activated via heat exchange pipes embedded within the structure. These structures function as a specialised form of ground heat exchanger, which can be integrated with ground source heat pump systems. Energy walls (EWs), a specific type of Energy Geostructure, are commonly used in basements, underground parking facilities, and metro stations. Despite their potential, there is currently no simple and reliable analytical method for the thermal analysis of EWs. Instead, their design relies on computationally expensive numerical simulations or oversimplified 'rules of thumb', both of which may lead to inefficiencies in cost and performance. This study presents a novel analytical approach based on the Infinite Plane Source (IPS) model and evaluates its accuracy by comparing it with two-dimensional numerical model data. The results demonstrate that the proposed method provides highly accurate estimates of temperatures at the back of the wall, making it a valuable foundation for future analytical design methodologies. The findings are applicable to EWs having an excavation on one side and ground on the other, as well as fully buried EWs with soil on both sides. This research offers a significant step toward the development of a practical, cost-effective analytical framework for the design and optimisation of EWs, promoting the broader adoption of shallow geothermal energy systems.
浅层地热能是一种很有前途的可再生室内供暖和制冷技术。利用这种能量的一种方法是通过能源土工结构,其中嵌入在地下的结构元件通过嵌入在结构中的热交换管进行热激活。这些结构作为一种特殊形式的地热交换器,可以与地源热泵系统集成。能源墙(Energy walls, EWs)是一种特殊类型的能源土工结构,通常用于地下室、地下停车场和地铁站。尽管其潜力巨大,但目前还没有简单可靠的分析方法来分析电炉的热分析。相反,它们的设计依赖于计算成本高昂的数值模拟或过于简化的“经验法则”,这两种方法都可能导致成本和性能的低效率。本文提出了一种新的基于无限平面源(IPS)模型的解析方法,并通过与二维数值模型数据的比较,对其精度进行了评价。结果表明,所提出的方法提供了高度准确的估计在墙后的温度,使其成为未来的分析设计方法的宝贵基础。研究结果适用于一侧为开挖而另一侧为地面的ewws,以及两侧为全埋且有土的ewws。这项研究为开发一种实用的、具有成本效益的分析框架来设计和优化EWs提供了重要的一步,促进了浅层地热能源系统的广泛采用。
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Geomechanics for Energy and the Environment
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