Géotechnique最新文献_第2页

Bearing performance of a novel caisson-plate gravity anchor 新型沉箱板式重力锚的承载性能

Géotechnique Pub Date : 2024-06-10 DOI: 10.1680/jgeot.23.00451

Shengjie Rui, Lizhong Wang, Zefeng Zhou, H. Jostad, Zhen Guo

{"title":"Bearing performance of a novel caisson-plate gravity anchor","authors":"Shengjie Rui, Lizhong Wang, Zefeng Zhou, H. Jostad, Zhen Guo","doi":"10.1680/jgeot.23.00451","DOIUrl":"https://doi.org/10.1680/jgeot.23.00451","url":null,"abstract":"To provide a more reliable shared anchor for floating wind farms, a novel caisson-plate gravity anchor (CGA) is proposed. This design merges the benefits of both gravity anchors and suction caissons. Centrifuge model tests adopting only half of each anchor were carried out to study their bearing performance in sand. Additionally, particle image velocimetry (PIV) analyses were performed to monitor anchor movement and soil displacement. As supplementary data, numerical simulations with an advanced hypoplasticity model were also conducted to reveal the anchor capacity mobilisation mechanism. Findings indicate that the novel CGA possesses a significantly higher bearing capacity compared to standalone caisson or plate designs. By adding a plate above the caisson and increasing its weight, the anchor failure modes may shift from forward rotation to translational movement. Additionally, this adjustment may transition the brittle failure to a more reliable ductile failure. This augmented capacity of the CGA stems from the expanded soil mobilisation region and increased soil stress level in front of the caisson. The proposed CGA provides a promising solution for shared anchors in floating wind farms.","PeriodicalId":508398,"journal":{"name":"Géotechnique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141360964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two-dimensional experimental assessment of interaction energy-induced suffusion in sand-clay mixtures 二维实验评估砂-粘土混合物中相互作用能引发的窒息现象

Géotechnique Pub Date : 2024-06-10 DOI: 10.1680/jgeot.23.00265

Jongmuk Won, Incheol Joo

{"title":"Two-dimensional experimental assessment of interaction energy-induced suffusion in sand-clay mixtures","authors":"Jongmuk Won, Incheol Joo","doi":"10.1680/jgeot.23.00265","DOIUrl":"https://doi.org/10.1680/jgeot.23.00265","url":null,"abstract":"Suffusion can be defined as the loss of relatively small soil particles in gap-graded soils without any volume change. This study investigates the susceptibility of interaction energy-induced suffusion in sand-clay mixtures through laboratory-scale two-dimensional flow cell. The filtrated clay during the injection was measured at three outlets to assess the gravity and reattachment effects as a function of clay type (kaolinite, illite, and bentonite) and sand grain size. It was found that the settling of detached clay particles and the reattachment effect during their transport through the sand medium is a strong function of the swelling potential of clay and the size ratio between sand and clay. In addition, observed particle size distributions of clay at the outlet demonstrated that the relatively small and large clay particles are susceptible to suffusion for non-swelling and swelling clay respectively. The comparison of total filtrated clay between two-dimensional flow cell and the typical soil-column experiments (one-dimensional flow) revealed a high chance of underestimating suffusion using soil-column experiments to assess the suffusion of sand-clay mixtures.","PeriodicalId":508398,"journal":{"name":"Géotechnique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141361969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predictive abilities of constitutive models for clay under monotonic and cyclic loading: element tests and centrifuge experiments 单调和循环加载下粘土构成模型的预测能力：元素测试和离心机实验

Géotechnique Pub Date : 2024-05-16 DOI: 10.1680/jgeot.23.00268

Merita Tafili, Patrick Staubach, Jan Machaček, Hauke Zachert, Torsten Wichtmann

引用次数: 0

Introducing tunnel kinematic constraints into an elastic continuum formulation of tunnel-soil-pipeline interaction 在隧道-土壤-管道相互作用的弹性连续体公式中引入隧道运动学约束条件

Géotechnique Pub Date : 2024-05-16 DOI: 10.1680/jgeot.24.00023

A. Klar, A. Franza, M. Zhou, H. W. Huang

{"title":"Introducing tunnel kinematic constraints into an elastic continuum formulation of tunnel-soil-pipeline interaction","authors":"A. Klar, A. Franza, M. Zhou, H. W. Huang","doi":"10.1680/jgeot.24.00023","DOIUrl":"https://doi.org/10.1680/jgeot.24.00023","url":null,"abstract":"This paper presents a new formulation of the problem of tunnelling effects on pipelines, which incorporates the tunnel kinematic constraints in the tunnel-soil-pipeline interaction analysis. This ‘constrained continuum formulation’ can be considered an extension of the original ‘two-stage’ elastic-continuum method, which traditionally neglects the mutual influence of the pipeline on the tunnel and vice versa. The new approach retains the advantage of using the greenfield condition as an input, but it allows closed-form consideration of the stiffening effect of the tunnel on the soil domain. The paper details the formulation and, then, provides an investigation into the effect of varying fixities: namely, both as ‘wished-in-place’ tunnels and as evolving, advancing constraints, with the tunnel “construction”. Normalised solutions are presented and compared with the previous formulation. In general, the addition of tunnel constraints leads to a stiffer soil action and, thus, higher bending stressing in the pipeline: modelling of the tunnel kinematic constraint is conservative. The question of when such analysis is desired is discussed, concluding with a simple-to-use inequality suitable for design.","PeriodicalId":508398,"journal":{"name":"Géotechnique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140966624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aquathermal effect of anomalous pressure generation in consolidating minefill 固结矿床异常压力产生的水热效应

Géotechnique Pub Date : 2024-05-15 DOI: 10.1680/jgeot.23.00410

G. D. Lu, A. P. S. Selvadurai, M. Meguid

{"title":"Aquathermal effect of anomalous pressure generation in consolidating minefill","authors":"G. D. Lu, A. P. S. Selvadurai, M. Meguid","doi":"10.1680/jgeot.23.00410","DOIUrl":"https://doi.org/10.1680/jgeot.23.00410","url":null,"abstract":"Recycling cement-amended tailings into subsurface cavities has delivered competitive socioeconomic revenue for underground mining. However, recent instances of anomalous thermal pressure in consolidating backfill have raised growing concerns over the current design philosophy. This study demonstrates that the excellent hydraulic sealing and considerable chemical energy inherent in cemented backfill can spontaneously generate substantial thermal pressurization through constrained pore-fluid expansion. An analytical solution is hence developed for characterizing the non-isothermal behaviour of hydrating backfill based on classical thermo-poroelasticity. The influence of preparation condition and mix design on the pressure evolution in time domain and during spontaneous heat generation is then thoroughly examined, successfully pinpointing the causal mechanism responsible for typical thermal pressure anomalies. It is demonstrated that the anomalous pressure is attributable to both the conservative binder usage, which increases the intrinsic heat load, and the elevated initial temperature, which promotes water volume expansion. The fundamental influence of temperature-sensitive water expansivity on the path dependence of thermal pressurization is also elucidated. This study thus contributes to a comprehensive understanding of the thermally correlated pressure anomalies that frequently occur in field operations. These critical findings would also hold practical implications for designing successful backfill solutions in challenging mine environments.","PeriodicalId":508398,"journal":{"name":"Géotechnique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140972095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Small-strain shear modulus and liquefaction resistance of calcareous sand with non-plastic fines 含非塑性细粒的钙质砂的小应变剪切模量和抗液化性能

Géotechnique Pub Date : 2024-05-08 DOI: 10.1680/jgeot.23.00199

Jian Hu, Yang Xiao, Jinquan Shi, A. Stuedlein, T. M. Evans

引用次数: 0

Exploring the micro-to-macro response of granular soils with real particle shapes via μCT-aided DEM analyses 通过 μCT 辅助 DEM 分析探索具有真实颗粒形状的粒状土的微观到宏观响应

Géotechnique Pub Date : 2024-03-31 DOI: 10.1680/jgeot.23.00162

Yang Li, M. Otsubo, Vasileios Angelidakis, R. Kuwano, S. Nadimi

{"title":"Exploring the micro-to-macro response of granular soils with real particle shapes via μCT-aided DEM analyses","authors":"Yang Li, M. Otsubo, Vasileios Angelidakis, R. Kuwano, S. Nadimi","doi":"10.1680/jgeot.23.00162","DOIUrl":"https://doi.org/10.1680/jgeot.23.00162","url":null,"abstract":"This contribution provides high fidelity images of real granular materials with the aid of X-ray micro computed tomography (μCT), and employs a multi-sphere representation to reconstruct non-spherical particles. Through the discrete element method (DEM) simulations on granular samples composed of these non-spherical clumps, the effect of particle shape on the macroscopic mechanical response and microscopic soil fabric evolution is examined for soil assemblies under triaxial compression. Simulation results indicate that materials with more irregular particles tend to show higher shear resistance in both peak and critical states, while exhibiting higher void ratio under isotropic loading conditions and in the critical state. The proposed critical state parameters for describing the sensitivity of the mean coordination number to confining pressures are larger as particles become more irregular. At a microscopic level of observation, directional and scalar parameters of particle contacts are sensitive to predefined particle asperities. More irregular materials appear to exhibit higher fabric anisotropy regarding particle orientation in the critical state, while branch vector is affected by both contact modes and particle shape. The critical stress ratio from the simulation results is validated by comparing with experimental results, and further found to be linearly linked to the shape-weighted fabric anisotropy indices.","PeriodicalId":508398,"journal":{"name":"Géotechnique","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140358932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Discussion on lateral load response of large-diameter monopiles in sand 关于沙土中大直径单桩横向荷载响应的讨论

Géotechnique Pub Date : 2024-03-25 DOI: 10.1680/jgeot.24.00990

Qian Hu, Fei Han, M. Prezzi, R. Salgado, Minghua Zhao, H. Wang, B. M. Lehane, M. F. Bransby, A. Askarinejad, L. Z. Wang

引用次数: 0

Discussion on ‘Pore changes in an illitic clay during one-dimensional compression’ 关于 "伊利特质粘土在一维压缩过程中的孔隙变化 "的讨论

Géotechnique Pub Date : 2024-02-27 DOI: 10.1680/jgeot.24.00991

Yanhao Zheng, B. Baudet, Pierre Delage, Jean-Michel Pereira, P. Sammonds, Prithvendra Singh, D. N. Singh

引用次数: 2

A fracture-based discrete model for simulating creep in quartz sands 模拟石英砂蠕变的基于断裂的离散模型

Géotechnique Pub Date : 2024-02-17 DOI: 10.1680/jgeot.23.00068

Jiangtao Lei, Marcos Arroyo, M. Ciantia, Ningning Zhang

引用次数: 0