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Soil-structure interaction behind integral bridge abutments 整体桥台背后的土-结构相互作用
IF 2.2 4区 工程技术 Q2 Earth and Planetary Sciences Pub Date : 2023-04-21 DOI: 10.1680/jgeen.22.00115
Michael Wiechecki, I. Thusyanthan, P. Nowak, J. Sandberg
Integral bridges are preferred on infrastructure schemes as they have lower maintenance costs than a conventional jointed bridge. A key aspect of integral bridge design is the assessment of long-term passive resistance that develops in the abutment backfill due to seasonal movements of the superstructure. This resistance is currently defined by an intermediate earth pressure coefficient termed K*, and is typically evaluated using the Limit Equilibrium (LE) approach prescribed in BSI PD-6694-1:2011+A1:2020. This paper adopts the alternate numerical design approach and investigates the development of K* behind full height abutments using Soil-Structure Interaction (SSI) modelling in PLAXIS-2D. The study demonstrates that mobilised passive resistance is primarily a function of backfill and structural stiffnesses, and that the current LE approach does not capture the backfill resistance profile correctly. The effectiveness of the SSI method was verified by comparison to the LE method. The current study provides a SSI methodology that is an efficient design approach, and which is suitable for a wide variety of integral bridge arrangements beyond the current LE method applicability.
整体桥梁是基础设施方案的首选,因为它们比传统的节理桥梁具有更低的维护成本。整体桥梁设计的一个关键方面是评估由于上部结构的季节性运动而在桥台回填中产生的长期被动阻力。该阻力目前由称为K*的中间土压力系数定义,通常使用BSI PD-6694-1:2011+A1:2020规定的极限平衡(LE)方法进行评估。本文采用交替数值设计方法,利用PLAXIS-2D的土-结构相互作用(SSI)模型研究全高桥台后K*的发展。研究表明,动员被动阻力主要是回填体和结构刚度的函数,目前的LE方法不能正确捕获回填体阻力剖面。通过与LE方法的比较,验证了SSI方法的有效性。目前的研究提供了一种SSI方法,这是一种有效的设计方法,适用于各种整体桥梁布置,超出了当前LE方法的适用性。
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引用次数: 0
Effect of compaction water on strength and hydraulic properties of bentonite based liner 压实水对膨润土基衬垫强度和水力性能的影响
IF 2.2 4区 工程技术 Q2 Earth and Planetary Sciences Pub Date : 2023-04-20 DOI: 10.1680/jgeen.22.00173
S. Rout, S. Singh
Abundance of pond ash and its resemblance with natural sand encourages its use as a substitute to sand in sand-bentonite (SB) liner material. Compaction water content influences the geoengineering properties of cohesive soil to a great extent. Accordingly, compaction, strength, permeability and shrinkage characteristics of both pond ash-bentonite (PAB) and SB mixes are investigated at standard and modified Proctor compaction energies at various water contents to support the recommendation of PAB mixture as an alternative landfill liner. At similar compaction conditions, PAB mix exhibits higher unconfined compressive strength (UCS) and hydraulic conductivity than that of SB mix. The UCS values of the dry-side compacted mixes are higher than those of the wet-side of compacted mixes. Dry-side compacted mixes shows a reduction in hydraulic conductivity with permeation time whereas; no substantial reduction in hydraulic conductivity is noticed for wet-side compacted mixes. Furthermore, the volumetric shrinkage of both PAB and SB mixes are within the permissible value of 4%, for a wide range of water variation from dry to wet-side of optimum. The observed mechanical properties are correlated to the shape of coarse fraction particle and the corresponding microstructural arrangements of the compacted specimens.
池灰的丰富及其与天然砂的相似性鼓励其作为砂-膨润土(SB)衬里材料的替代品。压实含水量在很大程度上影响黏性土的地球工程性质。因此,在不同含水量下,在标准和改良的普罗克特压实能下,研究了池灰-膨润土(PAB)和SB混合料的压实、强度、渗透性和收缩特性,以支持PAB混合料作为替代填埋衬垫的推荐。在相同的压实条件下,PAB混合料比SB混合料具有更高的无侧限抗压强度(UCS)和水导率。干侧压实混合料的单抗强度高于湿侧压实混合料。干侧压实混合料的导电性随渗透时间的延长而降低;湿侧压实混合料的水力导电性没有显著降低。此外,PAB和SB混合料的体积收缩率都在4%的允许值之内,从干侧到湿侧的水变化范围很广。观察到的力学性能与压实试样的粗颗粒形状和相应的显微组织排列有关。
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引用次数: 0
A practical framework for characterising the non-linear stiffness of overconsolidated soils and weak rock 描述超固结土和弱岩非线性刚度的实用框架
IF 2.2 4区 工程技术 Q2 Earth and Planetary Sciences Pub Date : 2023-04-03 DOI: 10.1680/jgeen.22.00210
T. O'brien, Xinjin Ho, Ringo Tan
Limit state design codes such as Eurocode 7 require good estimates of displacement to be made for serviceability checks. It is known that the stiffness of over-consolidated soils and weak rocks is highly non-linear and this needs to be taken into account for reliable displacements to be calculated. This paper outlines a relatively simple means of characterising the undrained and drained non-linear stiffness of a wide range of soils and rocks. A series of practical applications are described where the calculated stiffness non-linearity is compared with high quality field and laboratory test data, including back-analysis of full-scale structures. The non-linear stiffness function requires just four inputs: shear modulus at small-strain, shear strength, failure strain, and elastic threshold strain. Applications include: checking advanced test data and calibration of non-linear constitutive models; derivation of field stiffness, including variations with depth, non-linear stiffness curves, and assessing the potential effects of stiffness anisotropy.
极限状态设计规范,如欧洲规范7,要求对位移进行良好的估计,以进行适用性检查。众所周知,超固结土和软弱岩石的刚度是高度非线性的,为了计算可靠的位移,需要考虑这一点。本文概述了一种相对简单的方法来表征各种土壤和岩石的不排水和排水非线性刚度。本文描述了一系列实际应用,其中计算的刚度非线性与高质量的现场和实验室测试数据进行了比较,包括全尺寸结构的反分析。非线性刚度函数只需要四个输入:小应变剪切模量、剪切强度、破坏应变和弹性阈值应变。应用包括:检查先进的试验数据和校正非线性本构模型;场刚度的推导,包括随深度的变化,非线性刚度曲线,并评估刚度各向异性的潜在影响。
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引用次数: 0
Discrete element method modeling of structural clay 结构粘土的离散元法建模
IF 2.2 4区 工程技术 Q2 Earth and Planetary Sciences Pub Date : 2023-03-16 DOI: 10.1680/jgeen.22.00224
Jiawei Xu, Junneng Ye, Jin Sun, X. Bian
Structures in clay, found as an important role resulting in the weakness and failure of foundations under disturbance, are mainly caused by the cementation between particles. Existing constitutive models reflect the failure characteristics of clay from the phenomenological aspect, while the mechanism of the clay damage from a microscopic perspective is still unclear. In this study, the discrete element method, together with the bond and cohesive contact model, which were introduced for capturing the cohesion and structure of soft clay, respectively, is used to reproduce the cementation of clay, the numerical models of confined compression test, vane shear test and triaxial test were established, aiming to reveal the influence of structure of clay on its deformation and failure process. The results exhibited that the deformation and stress-strain development were in good agreement with experimental results in macroscopic. Moreover, the relationship between the structural failure and the macroscopic mechanical behavior can be established, which is helpful to better uncover the failure mechanism of structural clay. According to this developed of failure surface under the micro scale, an optimized suggestions were proposed for the conventional shear stress calculation in the vane shear test. The method in this study has the potential to simulate the mechanical behavior of structural clay and how significant implications for the improvement of the constitutive models and engineering design.
黏土中的结构是扰动作用下导致地基软弱和破坏的重要因素,其主要原因是颗粒间的胶结作用。现有的本构模型从现象学角度反映了粘土的破坏特征,而从微观角度来看,粘土损伤的机理尚不清楚。本研究采用离散元法,结合分别用于捕捉软黏土黏聚力和结构的黏结和黏结接触模型,对软黏土的胶结过程进行再现,建立了限压试验、叶片剪切试验和三轴试验的数值模型,旨在揭示软黏土结构对其变形破坏过程的影响。结果表明,在宏观上,变形和应力应变发展与实验结果吻合较好。建立了结构破坏与宏观力学行为之间的关系,有助于更好地揭示结构粘土的破坏机理。在此基础上,对叶片剪切试验中常规剪切应力计算方法提出了优化建议。本研究方法具有模拟结构粘土力学行为的潜力,对改进结构粘土的本构模型和工程设计具有重要意义。
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引用次数: 0
The surface bearing capacity of a strong granular layer on weaker sand 弱砂土上强颗粒层的表面承载能力
IF 2.2 4区 工程技术 Q2 Earth and Planetary Sciences Pub Date : 2023-03-16 DOI: 10.1680/jgeen.22.00094
A. Lees, A. Ali
Stronger granular layers are often placed as working platforms over weaker sand subgrade. The design of a working platform involves the calculation of a two-layer bearing capacity under rectangular loading. Existing design methods are either overly simplified, based on infinitely long strip loads, validated by a small number of small-scale 1g model tests or rely on numerous or empirically derived charts that are difficult to use or implement into design software. In this paper a new and highly practical design method is proposed where bearing capacity is determined simply from the shear strengths and unit weights of the two soil layers. It was derived from extensive FEA and FELA parametric studies in both plane strain and axisymmetric geometries and validated against published physical model tests, other FELA analyses and existing design methods. It can be applied to all rectangular shape ratios with dry and saturated layers.
较强的颗粒层通常被放置在较弱的砂路基上作为工作平台。某工作平台的设计涉及矩形荷载作用下两层承载能力的计算。现有的设计方法要么过于简化,基于无限长条荷载,通过少量小规模1g模型试验验证,要么依赖于大量或经验推导的图表,这些图表难以使用或在设计软件中实现。本文提出了一种新的、实用的设计方法,即简单地根据两土层的抗剪强度和单位重来确定承载力。该结果来源于广泛的FEA和FELA平面应变和轴对称几何参数研究,并通过已发表的物理模型试验、其他FELA分析和现有设计方法进行验证。它可以应用于所有矩形形状比例与干燥和饱和层。
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引用次数: 0
Propagation characteristics of stress wave in layered rock mass under the impact of high-pressure gas 高压气体作用下层状岩体应力波传播特性
IF 2.2 4区 工程技术 Q2 Earth and Planetary Sciences Pub Date : 2023-02-13 DOI: 10.1680/jgeen.22.00116
Haixia Wei, Chengzhi Wang, Jie Zhu, Xiaolin Yang, Huaibao Chu
As a highly safe and environment-friendly blasting technology, high-pressure gas blasting has replaced traditional explosive blasting in some engineering fields. This paper focuses on the characteristics of high-pressure gas impact load and the propagation law of the stress wave in layered rock mass under high-pressure gas blasting by experimental and numerical simulation methods. Firstly, through the experimental test of hole wall pressure, a segmented exponential model of the hole wall pressure under the impact of high-pressure gas is proposed, which can accurately account for the time history characteristics of hole wall load under the impact of high-pressure gas. Next, the experimental test of stress wave propagation is carried out, and the results show that the interface of soft rock and hard rock has a significant effect on the stress wave propagation in the layered rock mass. Based on the experimental test results, a specific strain model under 10 MPa high-pressure gas impact is fitted for single-hole layered rock mass, and a polynomial exponential model form is put forward and a specific strain model under 20 MPa high-pressure gas impact is fitted for the double-hole layered rock mass, which can well characterize the attenuation law of the stress wave for single-hole and double-hole layered rock mass respectively. The propagation characteristics of stress wave in layered rock mass under the impact of high-pressure gas are preliminary analyzed. Finally, a same numerical model consistent with the experimental test of stress wave propagation is established. The numerical model adopts the RHT material model with the tested parameters, and the proposed segmented exponential models of hole wall pressure are applied to the lower, middle and upper parts of the blasthole respectively. After the feasibility of the numerical model is analyzed, the propagation characteristics of the stress wave are further studied based on a specific underground pipe gallery project by numerical simulation. This study has important theoretical guiding significance and practical value for improving the rock breaking theory and optimizing the construction scheme of high-pressure gas blasting in layered rock mass.
高压气体爆破作为一种高度安全、环保的爆破技术,在一些工程领域已经取代了传统的炸药爆破。本文采用实验和数值模拟的方法研究了高压瓦斯爆破作用下层状岩体中高压瓦斯冲击载荷的特性和应力波的传播规律。首先,通过孔壁压力的实验测试,提出了高压气体作用下孔壁压力的分段指数模型,该模型能够准确地反映高压气体作用下孔壁载荷的时程特征。其次,进行了应力波传播的实验测试,结果表明,软、硬岩体界面对应力波在层状岩体中的传播有显著影响。在试验测试结果的基础上,拟合了单孔层状岩体在10 MPa高压气体冲击下的特定应变模型,提出了多项式指数模型形式,拟合了双孔层状岩体在20 MPa高压气体冲击下的特定应变模型,较好地表征了单孔和双孔层状岩体应力波的衰减规律。初步分析了高压气体作用下层状岩体中应力波的传播特性。最后,建立了与应力波传播实验结果一致的数值模型。数值模型采用具有试验参数的RHT材料模型,将所提出的孔壁压力分段指数模型分别应用于炮眼下部、中部和上部。在分析数值模型可行性的基础上,以某地下管廊工程为例,通过数值模拟进一步研究了应力波的传播特性。该研究对完善层状岩体高压瓦斯爆破破岩理论和优化施工方案具有重要的理论指导意义和实用价值。
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引用次数: 0
Resilient strain and stiffness degradation of Yellow River silt under long-term cyclic loads 长期循环荷载作用下黄河粉土弹性应变与刚度退化
IF 2.2 4区 工程技术 Q2 Earth and Planetary Sciences Pub Date : 2023-02-13 DOI: 10.1680/jgeen.22.00097
Yu-ke Wang, Rui Jiang, Yufeng Gao, J. Shao
The use of natural River silt treated as "waste materials" has become the focused research in the Yellow River flooded area, especially in the highway engineering recently. It is of great significance to study the deformation and stiffness degradation of the Yellow River silt under long-term cyclic loads. In this paper, a series of undrained cyclic triaxial tests with a large number of cycles (10000 times) for Yellow River silt have been carried out by using triaxial apparatus, the effects of confining pressure and cyclic stress ratio on the resilient strain of the Yellow River silt were explored. The critical cyclic stress and critical cyclic stress ratio between the plastic shakedown state and incremental collapse state of the Yellow River silt were determined, and the modulus softening behaviour of the Yellow River silt are discussed. This study not only provided theoretical support for the long-term engineering performance of the Yellow River silt, but also provided theoretical guidance for the cyclic response of all similar types of subgrade soils.
将天然河道淤泥作为“废物”处理利用已成为近年来黄河洪泛区特别是公路工程的研究热点。研究黄河泥沙在长期循环荷载作用下的变形和刚度退化具有重要意义。本文利用三轴试验装置对黄河粉土进行了一系列大循环次数(10000次)的不排水循环三轴试验,探讨了围压和循环应力比对黄河粉土弹性应变的影响。确定了黄河粉土塑性安定状态与渐进式崩塌状态的临界循环应力和临界循环应力比,讨论了黄河粉土的模量软化特性。本研究不仅为黄河粉土的长期工程性能提供了理论支持,也为所有类似类型的路基土的循环响应提供了理论指导。
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引用次数: 0
What is the probability of encountering unexploded bombs on a U.K. construction site? 在英国建筑工地遇到未爆炸炸弹的概率是多少?
IF 2.2 4区 工程技术 Q2 Earth and Planetary Sciences Pub Date : 2023-02-03 DOI: 10.1680/jgeen.21.00138
J. Gask, J. Moran
Quantitative risk data is essential for the efficient and consistent assessment of risk and allows for the effective use of cost-benefit analysis for assessing mitigating measures. The quantitative assessment of the risk posed by unexploded bombs (UXBs) on construction sites within the U.K. involves the identification of a set of contributory risk factors and modelling the interaction between them. The interaction of the risk factors has been modelled using Monte Carlo Simulation built into a new risk assessment tool (JG-MCS). Some of the output results from the tool are presented, including the limited validation that is possible against published work. The tool is used to assess the sensitivity of risk to some of the problem variables and several of the underlying assumptions are investigated. The model has also been extended to explore the influence of investigative mitigation measures. In this paper a set of fundamental questions are raised regarding the risks being assessed, how they are presented and the efficacy of some mitigation measures. For the scenario used, it was found that the overall risk of UXB encounter was low before mitigation and only slightly lower after mitigation. It was also found that the cost of implementing measures to reduce the risk posed by UXBs might be considered to be below the bracket of what is described by the HSE as ‘reasonably practicable’.
定量风险数据对于有效和一致地评估风险至关重要,并允许有效地利用成本效益分析来评估缓解措施。英国境内建筑工地未爆炸炸弹(uxb)风险的定量评估涉及识别一系列促成风险因素并对它们之间的相互作用进行建模。风险因素的相互作用已经使用蒙特卡罗模拟建立了一个新的风险评估工具(JG-MCS)。介绍了该工具的一些输出结果,包括针对已发表作品可能进行的有限验证。该工具用于评估风险对某些问题变量的敏感性,并研究了几个潜在的假设。该模型还得到扩展,以探讨调查性缓解措施的影响。在本文中,就正在评估的风险、如何呈现风险以及某些缓解措施的有效性提出了一系列基本问题。对于所使用的情景,发现在缓解之前遭遇UXB的总体风险很低,而在缓解之后仅略低。研究还发现,实施措施降低uxb带来的风险的成本可能被认为低于HSE所描述的“合理可行”的范围。
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引用次数: 0
Discussion: Effect of soil models on the prediction of tunnelling-induced deformations of structures 讨论:土体模型对隧道引起的结构变形预测的影响
4区 工程技术 Q2 Earth and Planetary Sciences Pub Date : 2023-02-01 DOI: 10.1680/jgeen.22.00123
Giorgia Giardina, Nunzio Losacco, Matthew J. DeJong, Giulia M. B. Viggiani, Robert J. Mair, J. N. Shirlaw, S. J. Boone
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引用次数: 1
Geotechnical Engineering: Referees 2022 岩土工程:裁判员2022
IF 2.2 4区 工程技术 Q2 Earth and Planetary Sciences Pub Date : 2023-02-01 DOI: 10.1680/jgeen.2023.176.1.104
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引用次数: 0
期刊
Proceedings of the Institution of Civil Engineers-Geotechnical Engineering
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