Geomechanics and Geoengineering-An International Journal最新文献_第5页

Variational approach for torsional dynamic response of a single pile in multi-layered soils 多层土中单桩扭转动力响应的变分方法

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2022-02-05 DOI: 10.1080/17486025.2022.2029954

H. Nghiem

引用次数: 2

Effective input velocity and depth for deep and shallow sites for site response analysis 用于场地响应分析的深、浅场地的有效输入速度和深度

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2022-01-16 DOI: 10.1080/17486025.2021.2023766

K. Bajaj, P. Anbazhagan

{"title":"Effective input velocity and depth for deep and shallow sites for site response analysis","authors":"K. Bajaj, P. Anbazhagan","doi":"10.1080/17486025.2021.2023766","DOIUrl":"https://doi.org/10.1080/17486025.2021.2023766","url":null,"abstract":"ABSTRACT Ground motion input layer depth and Vs are crucial parameters in computing representative surface amplification factor, especially for deep deposits where bedrock depth is unknown. For many soil sites, seismic bedrock depth is unknown and randomly assigning the input motion to any layer may result in bias response. The aim of this study is to understand the effect of input layer velocity or depth on surface response parameters. Further determining the appropriate layer for giving the input ground motion for reliable estimation of response parameters by carrying out detailed site-response analysis. For the analysis, surface and bedrock ground motion recordings from KiK-Net downhole are used. Total stress nonlinear site-response analysis has been carried out by varying the velocity and depth to input the ground motion recorded at the bottom most layer for deep and shallow profiles. Using linear mixed effect models on residuals calculated from recorded and predicted surface spectra, fixed bias and σ are calculated. Layer having Vs ≥ 1500 ( 150) m/s is suitable for capturing the surface amplification spectra for both deep and shallow deposits.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":"18 1","pages":"193 - 207"},"PeriodicalIF":1.3,"publicationDate":"2022-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46278727","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: 1

Evaluation of passive pile analysis methods using three-dimensional finite element analysis 用三维有限元分析评价被动桩分析方法

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2022-01-11 DOI: 10.1080/17486025.2022.2025922

M. Morsy, Y. El-Mossallamy, A. Salah

{"title":"Evaluation of passive pile analysis methods using three-dimensional finite element analysis","authors":"M. Morsy, Y. El-Mossallamy, A. Salah","doi":"10.1080/17486025.2022.2025922","DOIUrl":"https://doi.org/10.1080/17486025.2022.2025922","url":null,"abstract":"ABSTRACT Piles in soft soil supporting bridge abutments are often exposed to passive loading induced by adjacent bridge approach embankment. Several methods for analysis of passive piles have been developed, but the international design specifications do not recommend a specific method for the analysis of passive piles. Therefore, the applicability of existing empirical and analytical analysis (conventional) methods is examined by comparing their outputs with those of a validated finite element model (FEM) at various adjacent embankment stress levels, and construction times, soft clay thicknesses, and pile spacing to diameter ratios. Outputs of both conventional methods and FEM show that increasing the embankment stress, thickness of soft clay layer, and pile spacing to diameter ratio results in an increase in the lateral pile displacement, maximum bending moment, and lateral pressure, and vice-versa on increasing embankment construction time. The outputs of the conventional analysis methods are compared to the FEM outputs and are underestimated except for few cases. The conventional analysis methods may yield better predictions at pile diameter-to-spacing ratio equals 3–4 for a soil preloaded prior to pile construction to a degree of consolidation greater than 50%.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":"18 1","pages":"222 - 238"},"PeriodicalIF":1.3,"publicationDate":"2022-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43432091","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

Evaluation of Sand–tire Crumb Mixtures as Lightweight Fill Materials 砂-轮胎碎料混合料作为轻质填充材料的评价

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2022-01-09 DOI: 10.1080/17486025.2021.2024897

Waleed R. Abdullah, A. Ashkanani, Waleed K. Eid, R. Al-Fares, M. Alkhamis

{"title":"Evaluation of Sand–tire Crumb Mixtures as Lightweight Fill Materials","authors":"Waleed R. Abdullah, A. Ashkanani, Waleed K. Eid, R. Al-Fares, M. Alkhamis","doi":"10.1080/17486025.2021.2024897","DOIUrl":"https://doi.org/10.1080/17486025.2021.2024897","url":null,"abstract":"ABSTRACT The reuse of scrap rubber crumbs mixed with sand as lightweight fills is considered as a sustainable application. However, the performance of sand–crumb mixtures and the optimum content of crumbs have not been consistent. The purpose of this study was to investigate the feasibility of using sand–crumb mixtures for applications such as embankment fills, backfilling for subgrades, and retaining walls, and assess the optimum crumb contents in the mix. Mixtures of fill sand and rubber crumbs with sizes of 1–2 mm at crumb contents of 0%, 10%, 20%, and 30% by weight of dry sand were tested in a laboratory for compaction and penetration using the California bearing ratio (CBR) test and for shear strength using direct shear tests. The dry unit weight, CBR, dilation, and friction angle decreased as the crumb content increased, while apparent cohesion was introduced in the mixtures with the addition of crumbs, and it increased with the crumb content. Sand–crumb mixtures were effective as lightweight fill materials over soft soils, but were not suitable as subgrade materials. Furthermore, sand–crumb mixtures with an optimum crumb content of 20% provided the maximum reduction in lateral earth pressure when they were used as backfill materials behind retaining walls.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":"18 1","pages":"208 - 221"},"PeriodicalIF":1.3,"publicationDate":"2022-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42226510","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: 1

Experimental study on the behaviour of granular column-treated soft clay under shear loading 剪切荷载作用下颗粒柱处理软粘土行为的试验研究

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2022-01-06 DOI: 10.1080/17486025.2021.2015977

Iman Hosseinpour, A. Ghorbani, Javad Zarei, Sunil Ranjan Mohapatra

{"title":"Experimental study on the behaviour of granular column-treated soft clay under shear loading","authors":"Iman Hosseinpour, A. Ghorbani, Javad Zarei, Sunil Ranjan Mohapatra","doi":"10.1080/17486025.2021.2015977","DOIUrl":"https://doi.org/10.1080/17486025.2021.2015977","url":null,"abstract":"ABSTRACT Compacted granular columns are frequently used to mitigate construction difficulties over soft soil deposits through a combination of densification, increasing load-bearing capacity and improvement in consolidation features. The behaviour of granular columns under vertical loading has been well recognised; however, this research is aimed to investigate the behaviour of granular column-reinforced soft soil subjected to shear stress. In this contribution, large-scale direct shear tests were performed, and the influence of undrained shear strength of clay, diameter of granular column and relative density of aggregates was examined. In general, the use of granular column has been shown to improve the shear resistance of the composite ground, which was found to be much significant at lower undrained shear strength of the soft clay. Increasing density of aggregates from Dr = 50% to 90% caused a large portion of the shear stress to be sustained by the accumulated friction of aggregates as the internal friction angle of the treated clay increased from 0 to 28°. In addition, test results revealed that the use of highly compacted column yields a lowered shear displacement at failure, which was indirect evidence of stiffness improvement of the composite ground.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":"18 1","pages":"121 - 132"},"PeriodicalIF":1.3,"publicationDate":"2022-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46932922","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: 4

Synthesis of [7-¹⁵N]-GTPs for RNA structure and dynamics by NMR spectroscopy. 合成[7-15N]-GTPs，利用核磁共振光谱分析 RNA 结构和动力学。

IF 1.7

Geomechanics and Geoengineering-An International Journal Pub Date : 2022-01-01 Epub Date: 2022-02-26 DOI: 10.1007/s00706-022-02892-1

Kehinde M Taiwo, Lukasz T Olenginski, Felix Nußbaumer, Hyeyeon Nam, Stefan Hilber, Christoph Kreutz, T Kwaku Dayie

引用次数: 0

Discussion of ‘Factors influencing undrained strength of fine-grained soils at high water contents’ [Geomechanics and Geoengineering 13(4), 276–287] 关于“影响高含水量细粒土不排水强度的因素”的讨论[地质力学与地质工程13（4），276–287]

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-12-31 DOI: 10.1080/17486025.2021.2015457

B. O’Kelly, A. Soltani

{"title":"Discussion of ‘Factors influencing undrained strength of fine-grained soils at high water contents’ [Geomechanics and Geoengineering 13(4), 276–287]","authors":"B. O’Kelly, A. Soltani","doi":"10.1080/17486025.2021.2015457","DOIUrl":"https://doi.org/10.1080/17486025.2021.2015457","url":null,"abstract":"It is the authors’ opinion that confusion could arise from the analyses and explanations of the experimental fall-cone (FC) results presented in the paper by Nagaraj et al. (2018), which has been compounded in their recent Closure (Nagaraj et al. 2021) to the Discussion of their 2018 paper by Haigh et al. (2021). For the investigation by Nagaraj et al. (2018), the FC method, as per the British Standards Institution (BSI) BS 1377–2 (1990), was used to determine the liquid limit (i.e. wL-FC(BSI)), which defines the liquid-limit state transition as the water content corresponding to a penetration depth of hL = 20 mm for a smooth, polished 30°–80 g FC with its tip initially just contacting the top surface of the fine-grained soil test specimen. The FC test was originally developed for measuring undrained shear strength (Hansbo 1957, O’Kelly et al. 2018) and was subsequently adopted for determination of the FC liquid limit (e.g. BSI 1975), with the FC-deduced saturated remoulded undrained shear strength (i.e. cu(FC)) of a finegrained soil tested at a given water content determined as follows:","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":"18 1","pages":"170 - 174"},"PeriodicalIF":1.3,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44121453","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: 1

Effect of sheet pile wall on the load-settlement behaviour of square footing nearby excavation 板桩墙对基坑附近方基础荷载沉降特性的影响

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-12-31 DOI: 10.1080/17486025.2021.2019320

H. Ahmad, Mohammad Hosein Hoseini, A. Mahboubi, A. Noorzad, M. Zamanian

{"title":"Effect of sheet pile wall on the load-settlement behaviour of square footing nearby excavation","authors":"H. Ahmad, Mohammad Hosein Hoseini, A. Mahboubi, A. Noorzad, M. Zamanian","doi":"10.1080/17486025.2021.2019320","DOIUrl":"https://doi.org/10.1080/17486025.2021.2019320","url":null,"abstract":"ABSTRACT Due to the shortage of urban land, new buildings are constructed adjacent to old buildings. In this regard, there is limited information about the behaviour of the shallow foundations adjacent to the excavation. In this research, a series of experimental and numerical studies are conducted on reinforced and unreinforced granular soils adjacent to excavation loaded with square footings. The experimental results are in good agreement with the numerical study. Numerical investigations were carried out on sandy excavation by varying the footing distance from the edge of the different granular excavations. It was found that by using three reinforcing layers, the ultimate bearing capacity would increase. Additionally, excavation has no significant effect in the vicinity of 4B, in which B is the footing width. Furthermore, the need to build new large buildings in the vicinity of each other has reduced the distances between square footings and, as a result, has created the phenomenon of interference in the footings and excavation. This occurs through the interference of wedges and rupture surfaces. Since this phenomenon bears a substantial result on the bearing capacity of shallow footings, this work investigates the effect of interference of ruptured wedges on the carriage capacity, settlement, and deformation of square footings. The optimum interference factor is defined at spacings of 2B and 3B for dense and loose reinforced sands, respectively. Furthermore, by including three continuous geogrid layers underneath two square footing interferences, their behaviour will be improved.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":"18 1","pages":"149 - 167"},"PeriodicalIF":1.3,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41934620","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: 2

Investigation of soil plug formation in hollow piles using PIV technique 应用PIV技术研究空心桩土塞的形成

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-12-30 DOI: 10.1080/17486025.2021.2018509

Sreelakshmi G, Asha M. N

{"title":"Investigation of soil plug formation in hollow piles using PIV technique","authors":"Sreelakshmi G, Asha M. N","doi":"10.1080/17486025.2021.2018509","DOIUrl":"https://doi.org/10.1080/17486025.2021.2018509","url":null,"abstract":"ABSTRACT The foundation systems for bridges and marine structures demand deep foundations like hollow driven open-ended piles, where hard-bearing strata exist on deep soil underneath loose inland and oceanic sea floors. During this driving process, a soil plug is formed near the hollow pile tip region, resulting in soil crushing and compression at the pile tip. The conventional methods fail to predict such volume changes and densification of the embedded soil. The present study utilised Particle Image Velocimetry (PIV) technique to assess the plugging at the pile tip and compare the penetration rate under different infill densities. The PIV results indicated that at a specific energy, pile geometric parameters and infill conditions strongly influenced pile drivability in a granular medium. Due to disturbance caused by pile driving at the base, high compressive strains are observed for large diameter piles, while large dilative strains developed soil plug during the penetration stage for small diameter piles. The plug surface profile was concave for larger diameter piles due to active arching mechanism, while it was convex for small diameter piles due to passive arching generated by lateral soil confinement within the pile wall surface.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":"18 1","pages":"133 - 148"},"PeriodicalIF":1.3,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44578050","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

3D stability analysis of unsupported rectangular excavation under pseudo-static seismic body force 拟静力地震体力作用下无支承矩形基坑三维稳定性分析

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-12-29 DOI: 10.1080/17486025.2021.2019321

Patteera Petchkaew, S. Keawsawasvong, Weeradetch Tanapalungkorn, S. Likitlersuang

引用次数: 7