Proceedings of the Institution of Civil Engineers-Geotechnical Engineering最新文献_第5页

Seismic response of rigid-drainage pile-superstructure-quay wall system subjected to lateral spreading 横向扩展作用下刚性排水桩-上部结构-码头墙体体系的地震响应

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2023-01-26 DOI: 10.1680/jgeen.22.00147

Zhi-xiong Chen, Can Liu, Chenglong Wang, Xuan-chen Ding, Yu-min Chen, Wengang Zhang

{"title":"Seismic response of rigid-drainage pile-superstructure-quay wall system subjected to lateral spreading","authors":"Zhi-xiong Chen, Can Liu, Chenglong Wang, Xuan-chen Ding, Yu-min Chen, Wengang Zhang","doi":"10.1680/jgeen.22.00147","DOIUrl":"https://doi.org/10.1680/jgeen.22.00147","url":null,"abstract":"Many examples of earthquake damage show that liquefied lateral spreading is the main cause of pile foundation failure. Rigid-drainage piles installed two drainage grooves with plastic drainage plates are a new type of liquefaction-resistant pile that can take into account the bearing capacity and drainage function. In this paper, a series of 1-g shaking table tests were carried out to analyse the seismic response of a rigid-drainage pile-superstructure-quay (RSQ) wall system subjected to lateral spreading. Three levels of earthquake intensities, including small earthquakes (peak ground acceleration, PGA=0.05 g), moderate earthquakes (PGA=0.1 g), and large earthquakes (PGA=0.2 g), were investigated. The improvement in the anti-liquefaction performance of the rigid-drainage piles was comparatively analysed. Moreover, the influences of far-field and near-field ground motions were also discussed. The experimental results showed that rigid-drainage piles could effectively reduce the liquefaction degree and the horizontal flow of the sand stratum. In addition, the internal force and displacement of the superstructure built on drainage piles were small. The observations of the influence of far-field and near-field ground motions indicated that the seismic response of near-field ground motion was more significant than that of far-field ground motion, but the effect of far-field ground motion could not be disregarded. The results of these tests could provide useful information for the design of rigid-drainage pile groups in a typical pile-superstructure-quay wall system.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75844454","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

Soil resistance during vibratory driving in sand 砂土振动掘进过程中的土阻力

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2023-01-20 DOI: 10.1680/jgeen.22.00193

K. Massarsch

{"title":"Soil resistance during vibratory driving in sand","authors":"K. Massarsch","doi":"10.1680/jgeen.22.00193","DOIUrl":"https://doi.org/10.1680/jgeen.22.00193","url":null,"abstract":"The mechanism that can explain pile shaft resistance during vibratory driving is discussed. One hypothesis is that horizontally oscillating stresses temporarily reduce the shaft resistance. To investigate this hypothesis, vibration measurements were carried out in medium-dense to dense sand during the vibratory driving. A vibrator with variable frequency was used to install a large compaction probe. The driving process and ground response were documented in detail. Geophones were installed on and below the ground surface. Horizontal ground vibrations were measured at three levels below the ground surface. The difference in vibration response of the ground during driving at a high frequency (27 Hz) and at the system resonance frequency (15 Hz) showed the effect of the vibrator operating frequency on penetration speed and emitted ground vibrations. During vibratory driving, horizontal stress pulses are emitted along the probe shaft, which can temporarily reduce static horizontal stresses acting against the probe shaft. This phenomenon can explain the temporary reduction of the shaft resistance and the efficiency of vibratory driving in granular soils. As a result of the horizontal stress pulses, the horizontal stresses are increased permanently. By using a monitoring and process control system, it is also possible to determine the system resonance frequency in the field, which is a critical parameter for vibratory driving resistance, emission of ground vibrations, and vibratory compaction of granular soils.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89726644","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

Influence of pile end soil on the torsional vibration of a pile based on the cone-shaped fictitious soil pile model considering the stress diffusion 基于考虑应力扩散的锥形虚拟土桩模型的桩端土对桩扭转振动的影响

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2023-01-19 DOI: 10.1680/jgeen.21.00058

Tugen Feng, Zhenya Li, Jian Zhang

引用次数: 0

Performance of Fin pile subjected to torsional loads embedded in dry sand 干沙中嵌入扭转荷载作用下翅片桩的性能研究

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2023-01-16 DOI: 10.1680/jgeen.22.00150

A. Sallam

{"title":"Performance of Fin pile subjected to torsional loads embedded in dry sand","authors":"A. Sallam","doi":"10.1680/jgeen.22.00150","DOIUrl":"https://doi.org/10.1680/jgeen.22.00150","url":null,"abstract":"Fin piles are manufactured foundations which are utilized for most kinds of constructions like radar towers, transmission towers, tall chimneys, bridge piers, offshore structures, buried pipelines under water etc. Fin piles are structural elements utilized in civil engineering implementations to provide resistance against lateral loadings. The purpose of this investigation is to highlight the technique of shaft pile with fins embedded in dry sand. In this study, torsional capacities of shaft piles with fins are experimentally examined. A total number of sixty-three model experimental tests were studied on fin piles installed in dry sand. For comparison, model experimental tests were performed on conventional piles without such fins to investigate the behavior of fin piles on the torsional capacity under diverse parameters. The influence of such fins which are constructed at the top of the shaft at diversified values of width and length was investigated. The test results elucidated that; the fin efficiency of torsional capacities of fin piles ameliorates with the increase both of fin width/pile diameter ratio, (Wf/Dp) and sand relative density. The adopted fins of the shaft play a vital function in its torsional capacity. This is attributed to the section modulus of fin pile shaft is augmented at the top of the shaft due to the presence of fins which lead to a soil–pile-fins interaction. Utilization of fins at the top of the shafts are efficacious in ameliorating the torsional capacity of fin piles. In addition, augmenting the fin width will provide an appreciably higher soil resistance and a stiffer performance due to an augmentation of the passive zone of earth pressure in front of the shaft compared with conventional piles. This guides to an amelioration in the torsional capacity for fin piles.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89198795","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

Evaluating friction angles for clays: piezocone tests versus Atterberg limits 评估粘土的摩擦角:压锥试验与阿特伯格极限

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2023-01-10 DOI: 10.1680/jgeen.22.00135

Z. Ouyang, P. Mayne

引用次数: 0

Shear behaviour of peat at different stress levels 不同应力水平下泥炭的剪切特性

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2023-01-03 DOI: 10.1680/jgeen.22.00058

Di Wang, Zili Li

{"title":"Shear behaviour of peat at different stress levels","authors":"Di Wang, Zili Li","doi":"10.1680/jgeen.22.00058","DOIUrl":"https://doi.org/10.1680/jgeen.22.00058","url":null,"abstract":"In this study, a series of consolidated, undrained triaxial compression tests were conducted to investigate peat shear behaviour on samples from 1.65 m depth when subjected to different stress levels from 10.4 kPa to 40.5 kPa. At the consolidation stage, the triaxial test specifically investigated the peat isotropic compressibility at low stress levels, showing an agreement with oedometer test data available in literature. The subsequent triaxial shearing stage results show most of the test data failed to reach the tension cut-off line (q/p’ = 3), which indicated that the deviator stress may represent more of an interparticle connection than the tension of fibres and woods in peaty soils. For peat, the membrane correction effect on peat shear resistance is strain dependent; generally, small within 10% shear strain, but becomes significant above 10% shear strain. A critical state line for peat was determined based on the maximum curvature approach, where the Mohr-Coulomb model has difficulty in determining the friction angle for peat. Of the data recorded for the peat, 78% fell within the range of 30 to 60 degrees, increasing to 90.4% when ignoring points lower than 10 kPa; the previous test data for very low stress level (less than 10kPa) might not be sufficiently reliable due to limitations of conventional triaxial testing apparatus, specimen preparation and etc. In addition, organic content also plays an important role on the peat shear behaviour. In general, when the organic content exceeds 75%, the deviator stress behaves like organic soils, otherwise, the peat behaves more like a mineral soil. In peat samples with organic content higher than 75%, the direct shear box test gives higher estimates of shear strength than the triaxial shear test, but not necessarily accurate — the mechanism of direct shear acts only at the centre of a specimen, while triaxial shear can shear throughout the specimens.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84767902","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

Micro-macro analysis of shear band formation due to reverse fault in various normalized fault throw 不同归一化断距下逆断层剪切带形成的微观宏观分析

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2022-12-19 DOI: 10.1680/jgeen.22.00095

Saman Ghaderi, Alireza Saeedi Azizkandi

{"title":"Micro-macro analysis of shear band formation due to reverse fault in various normalized fault throw","authors":"Saman Ghaderi, Alireza Saeedi Azizkandi","doi":"10.1680/jgeen.22.00095","DOIUrl":"https://doi.org/10.1680/jgeen.22.00095","url":null,"abstract":"A two-dimensional discrete element modeling is adopted to study engineering and fundamental aspects of shear band formation in reverse faulting through sandy soils with varying densities. The employed DEM modeling methodology is verified with the experimental centrifuge result. From an engineering perspective, results show that the shear bands formed due to reverse fault consist of multiple ruptures formed at the different fault raise. These ruptures may deviate toward the hanging or footing wall depending on the faulting angle. The distortion zone outcropping location is captured by the W/H ratio at the 1% normalized fault throw (h/H) step. Various micro and macro aspects of shear banding, such as porosity, coordination number, and strong contact forces within the localized areas along the shear bands, are studied. Moreover, a link is established between the micro and macro events occurring inside the shear bands. The results show that the wedge pressure formed between the shear band and back-thrust rupture in the fault with a dip angle smaller than 45° significantly affects the back-thrust formation and micro-macro parameters in the shearing region.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83809761","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

The collapse frequency and failure probability of retaining structures 挡土结构的倒塌频率和破坏概率

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2022-12-19 DOI: 10.1680/jgeen.21.00128

D. Proske, Christof Hofmann

引用次数: 0

Analysis of the influence of siphon hole spacing on soft soil drainage effect 虹吸孔间距对软土排水效果的影响分析

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2022-12-14 DOI: 10.1680/jgeen.22.00145

Qingsong Shen, Jia-ling Wang, Hong-yue Sun, Junwei Shu, Y. Shang

引用次数: 1

TengizChevroil Future Growth Project – The Design of Temporary Haul Roads 腾吉兹雪佛龙未来发展项目-临时运输道路的设计

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2022-11-21 DOI: 10.1680/jgeen.22.00090

P. Nowak, J. Barr

{"title":"TengizChevroil Future Growth Project – The Design of Temporary Haul Roads","authors":"P. Nowak, J. Barr","doi":"10.1680/jgeen.22.00090","DOIUrl":"https://doi.org/10.1680/jgeen.22.00090","url":null,"abstract":"The 36 kilometre haul road for the TengizChevroil Future Growth Project (TCO FGP) at the Tengiz oilfield in Western Kazakhstan provided a unique opportunity to examine the dynamic effect of heavy traffic loading on earthworks. The haul road was constructed to facilitate transport of 252no partially constructed module units from a purpose built terminal in the Caspian Sea to the construction area within the oilfield. The ground underlying the haul road comprises recent, predominantly granular deposits with palaeo-channels of very soft cohesive material up to 4 metres thick. The module units, weighing up to 2300 tonnes, were transported on multi-wheeled trailers imparting a maximum distributed ground bearing pressure of 80kN/m2. The project strategy was that areas underlain by soft cohesive soils would not be treated but a budget would be allocated for maintenance during operation of the road. The haul road was designed using quasi-static loading with checks using limit equilibrium and finite element methods. The construction programme allowed instrumentation installed during the ground investigation to be used to complete a dynamic embankment trial to monitor settlement and pore water pressure response in the underlying soils, which was supplemented by further monitoring during haul road operation. The monitoring indicated that adoption of the quasi-static approach for traffic loading does not realistically reflect short duration dynamic loading on earthworks and that the quasi-static approach is highly conservative when applied to moving loads.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89422328","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