International Journal of Physical Modelling in Geotechnics最新文献

Centrifuge modelling of groundwater variation induced settlement using different scaling methods 使用不同缩放方法对地下水变化诱导沉降进行离心建模

IF 1.9 4区工程技术

International Journal of Physical Modelling in Geotechnics Pub Date : 2024-06-10 DOI: 10.1680/jphmg.23.00049

Yuzhen Liang, Xiaoqiang Gu, Deshun Wu, Zhiqiang Fan, Qihui Zhou, Zunjing Liu

{"title":"Centrifuge modelling of groundwater variation induced settlement using different scaling methods","authors":"Yuzhen Liang, Xiaoqiang Gu, Deshun Wu, Zhiqiang Fan, Qihui Zhou, Zunjing Liu","doi":"10.1680/jphmg.23.00049","DOIUrl":"https://doi.org/10.1680/jphmg.23.00049","url":null,"abstract":"Groundwater variation is a significant cause for high-fill foundation settlement, which is the main concern of such high-fill projects. In this study, centrifugal model tests were carried out to study the settlement of a high-fill foundation using a wetting-drying system for simulating water level variations. Three scaling methods which are equivalent substitution method, trapezoid similarity method and parallel gradation method, were utilized to prepare the particle size distribution of tested specimens considering the model size. The test process consists four loading cycles and each loading cycle consists of construction, water rise and drainage stages. The analysis results showed that settlement during the construction stage is dominant, and the settlement after construction only accounted for less than 20% of the total settlement. Besides, the settlement of the backfill itself increases with the filling height. The ratio between the settlement and the filling height of the specimen prepared by the equivalent substitution method is higher than the field monitoring data, while those prepared by the trapezoid similarity method or parallel gradation method agree well with the measurements. The settlement after construction with time can be predicted by the three-point method. Furthermore, the total settlement increases as the number of the wetting-drying cycles increases, especially in the initial phase of water table rising. The settlement during the water level rise was remarkably greater than that during the draw-down of the water level in each wetting-drying cycle. The soil gradation curve shift upwards after the tests, especially for the bottom part of soil.","PeriodicalId":48816,"journal":{"name":"International Journal of Physical Modelling in Geotechnics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141365955","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

Effect of facing stiffness on GRS walls under surcharge loading-unloading 附加荷载加载-卸载条件下面层刚度对 GRS 墙体的影响

IF 1.9 4区工程技术

International Journal of Physical Modelling in Geotechnics Pub Date : 2024-06-10 DOI: 10.1680/jphmg.23.00033

S. H. Mirmoradi, M. Ehrlich

{"title":"Effect of facing stiffness on GRS walls under surcharge loading-unloading","authors":"S. H. Mirmoradi, M. Ehrlich","doi":"10.1680/jphmg.23.00033","DOIUrl":"https://doi.org/10.1680/jphmg.23.00033","url":null,"abstract":"This paper investigates the impact of facing stiffness on the performance of geosynthetic-reinforced soil (GRS) walls under surcharge loading-unloading. Data from two instrumented physical model tests are utilized considering two different facing stiffness (block and wrapped). After the end of construction, the physical models were loaded and unloaded, step by step. They were comprehensively instrumented to monitor the load mobilized along with the reinforcements, horizontal toe load, lateral facing displacement, vertical displacement at the top of the walls, and horizontal stress behind the block faces. In addition, a simplified analytical procedure is proposed in order to determine the maximum reinforcement load under surcharge unloading. The results show that the toe restraint at the base of the block-faced wall highly controls the performance of GRS wall with structural facing. When there is no toe resistance, irrespective of the facing type, the walls present, in general, similar performance under surcharge loading and unloading. Furthermore, during surcharge unloading, the reinforcement load near the face may be less affected in the wrapped-face wall compared with the block-faced wall. Moreover, the maximum reinforcement loads during surcharge unloading were fairly captured using the proposed procedure.","PeriodicalId":48816,"journal":{"name":"International Journal of Physical Modelling in Geotechnics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141363195","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

Physical model test study on strength characteristics of gravel pile composite foundation 砾石桩复合地基强度特性的物理模型试验研究

IF 1.9 4区工程技术

International Journal of Physical Modelling in Geotechnics Pub Date : 2024-06-04 DOI: 10.1680/jphmg.23.00046

Jia-Hui Wang, Ji-Wei Jiang, Yi-Fei Sun, Bao-tian Wang, Shao-Yang Han, Jin-Yu Zuo, Wen-Wei Li, Yang Tang

{"title":"Physical model test study on strength characteristics of gravel pile composite foundation","authors":"Jia-Hui Wang, Ji-Wei Jiang, Yi-Fei Sun, Bao-tian Wang, Shao-Yang Han, Jin-Yu Zuo, Wen-Wei Li, Yang Tang","doi":"10.1680/jphmg.23.00046","DOIUrl":"https://doi.org/10.1680/jphmg.23.00046","url":null,"abstract":"In gravel pile composite foundation stability design, the shear strength of composite foundation is critically important. However, due to the size limitation of test equipment, it is difficult to obtain its shear strength in field. This study designs a laboratory shear model test to obtain the shear strength of gravel pile composite foundation, where a total of four group tests were carried out, including two nature soils and two gravel pile area replacement ratios. The shear strength parameters obtained by the shear model tests are compared with the results of empirical formula methods such as the Chinese Standard Method and Priebe Method to verify the accuracy of these two methods. It is demonstrated that for the Chinese Standard Method, the empirical formula's results are smaller than the shear model test results when the pile-soil stress ratio b is 1. When the pile-soil stress ratio b is 1.5, the results are close to each other. For the Priebe Method, the empirical formula results are all larger than the shear model test results, and it is especially unsuitable for the mud soil.","PeriodicalId":48816,"journal":{"name":"International Journal of Physical Modelling in Geotechnics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141266738","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

Pressure and thermal effects on Rayleigh fiber-optic strain measurment for soil-structure interaction 压力和热效应对用于土壤-结构相互作用的瑞利光纤应变测量的影响

IF 1.9 4区工程技术

International Journal of Physical Modelling in Geotechnics Pub Date : 2024-06-03 DOI: 10.1680/jphmg.23.00060

G. N. Eichhorn, Stuart K. Haigh

{"title":"Pressure and thermal effects on Rayleigh fiber-optic strain measurment for soil-structure interaction","authors":"G. N. Eichhorn, Stuart K. Haigh","doi":"10.1680/jphmg.23.00060","DOIUrl":"https://doi.org/10.1680/jphmg.23.00060","url":null,"abstract":"Optical strain sensing in civil engineering has been adopted for both field applications and advanced laboratory testing of structural health monitoring. Rayleigh backscatter devices (ROFDR) are presented for use with geotechnical centrifuge research since they offer distributed sensing capabilities, and through this study have been shown to have negligible interference from pressure effects, and can be made with low-cost disposable sensors. A comparison between a single channel and multi-channel fiber optic rotary joint (FORJ) is presented in the context of transmitting optical strain data across a rotating interface. The orthogonal pressure effects (eg. From soil) of a free-floating fiber under isotropic pressure was less than 0.32 με / kPa and that the pressure effect on a fiber bonded to a metal surface was below the detection limit of the instrument, 1 με, for an applied pressure of 60 kPa. The ROFDR system showed highly repeatable measurement of a constant temperature reading through the use of a water bath experiment. The system is stable to +/- 10 microstrain within 2-sigma for a >12 hr constant temperature test. An example case of a pipeline buried in a slope experiencing a landslide is presented where the optical strain sensing is used to capture strain pairs along the crownline and pipe invert to capture bending moment of the pipeline. Geotechnical centrifuge modelling in a 1 metre drum was carried out using a multi-channel FORJ coupled with an ROFDR system.","PeriodicalId":48816,"journal":{"name":"International Journal of Physical Modelling in Geotechnics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141269559","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

Scaling laws for the modelling of energy geostructures 能源地质结构建模的比例法则

IF 1.9 4区工程技术

International Journal of Physical Modelling in Geotechnics Pub Date : 2024-05-16 DOI: 10.1680/jphmg.22.00073

Badr Ouzzine, Jean de Sauvage, Sahar Hemmati, Thibault Badinier, Matthieu Blanc, Thierry Dubreucq, Christophe Chevalier, Philippe Reiffsteck

引用次数: 0

Active failure mechanism and earth pressure of narrow backfill behind retaining structures 挡土结构后狭窄回填土的主动破坏机制和土压力

IF 1.9 4区工程技术

International Journal of Physical Modelling in Geotechnics Pub Date : 2024-04-29 DOI: 10.1680/jphmg.23.00042

Hao-Biao Chen, Cheng Lin, Yan-Ping Lv, Fu-Quan Chen

引用次数: 0

Physical modelling of cyclic loading induced footing settlement with a nearby pit excavation 循环荷载诱导基脚沉降与附近基坑开挖的物理模型

IF 1.9 4区工程技术

International Journal of Physical Modelling in Geotechnics Pub Date : 2024-03-11 DOI: 10.1680/jphmg.23.00016

Zhiyong Liu, Jiapei Ma, Junhua Xiao, Jianfeng Xue, Fei Yang

{"title":"Physical modelling of cyclic loading induced footing settlement with a nearby pit excavation","authors":"Zhiyong Liu, Jiapei Ma, Junhua Xiao, Jianfeng Xue, Fei Yang","doi":"10.1680/jphmg.23.00016","DOIUrl":"https://doi.org/10.1680/jphmg.23.00016","url":null,"abstract":"A series of physical model tests and cyclic triaxial tests were performed on a dry sand to investigate the effects of excavating an adjacent pit on the settlement behaviour of a footing under cyclic loading. The excavation is simulated by moving a retaining wall between loading cycles in the physical model tests. The excavation induced stress disturbance on soil elements is modelled by reducing cell pressure between loading cycles in triaxial tests. The results indicate that nearby excavation leads to reduction in lateral stress in ground and therefore increases the settlement of footing in the subsequent loading cycles. However, there is no clear relationship between the settlement increment and the magnitude of wall movement, when the lateral movement of the wall is within the range of 0.1% to 0.37% of the wall height. The lateral excavation does not have great impact on the influence zone of the footings under cyclic loading. An empirical model is proposed to estimate the cyclic loading-induced strain accumulation of sand with the consideration of lateral unloading effects between loading cycles. After being validated using cyclic triaxial tests results, the proposed model is employed to predict cyclic loading-induced settlement of the footing before and after the excavation.","PeriodicalId":48816,"journal":{"name":"International Journal of Physical Modelling in Geotechnics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140204700","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

Centrifuge tests exploring the cyclic performance of suction bucket foundations in cohesionless soils 探索无粘性土中吸斗地基循环性能的离心机试验

IF 1.9 4区工程技术

International Journal of Physical Modelling in Geotechnics Pub Date : 2024-03-06 DOI: 10.1680/jphmg.23.00020

Senthen Amuthan Mani, Francisco da Silva Pereira, Phil Watson, Britta Bienen, M. Fraser Bransby, Han Eng Low, Carl Erbrich, Sam Ingarfield, Avi Shonberg, Michael Harte

{"title":"Centrifuge tests exploring the cyclic performance of suction bucket foundations in cohesionless soils","authors":"Senthen Amuthan Mani, Francisco da Silva Pereira, Phil Watson, Britta Bienen, M. Fraser Bransby, Han Eng Low, Carl Erbrich, Sam Ingarfield, Avi Shonberg, Michael Harte","doi":"10.1680/jphmg.23.00020","DOIUrl":"https://doi.org/10.1680/jphmg.23.00020","url":null,"abstract":"An alternate to monopiles to support offshore wind turbines is the use of jacket structures founded on suction buckets. These foundations have been successfully deployed in recent developments and have proven to be a viable foundation concept due to their relatively fast and low-noise installation, as well as their general applicability for a wide range of soil-conditions and suitability in deeper waters. However, the behaviour of bucket foundations subject to both short- and long-term uplift loading in coarse grained soil remains an area of ongoing research. For the centrifuge testing in this project, offshore soil was provided from an Asian site – and the combination of silt size particles, water pore fluid and faster loading rates was used to replicate the drainage conditions during the loading of a full-scale bucket foundation in sand. Initial self-weight penetration of the skirts was followed by suction installation, with in-place testing then undertaken to explore both monotonic and cyclic performance. This paper presents results from the pilot testing, including the foundation response to cyclic (storm) loading applied symmetrically around an average uplift load.","PeriodicalId":48816,"journal":{"name":"International Journal of Physical Modelling in Geotechnics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140204670","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

Development of a small-scale geotechnical centrifuge 开发小型土工离心机

IF 1.9 4区工程技术

International Journal of Physical Modelling in Geotechnics Pub Date : 2024-01-17 DOI: 10.1680/jphmg.22.00015

A. Sorta, Neville Dubash, Benny Moyls, Scott E. Webster, O. Omotoso

{"title":"Development of a small-scale geotechnical centrifuge","authors":"A. Sorta, Neville Dubash, Benny Moyls, Scott E. Webster, O. Omotoso","doi":"10.1680/jphmg.22.00015","DOIUrl":"https://doi.org/10.1680/jphmg.22.00015","url":null,"abstract":"Oil sands fluid fine tailings in Northern Alberta have very poor water release characteristics and require many decades to fully consolidate under their own weight. Generally, physical and/or chemical treatments are necessary to improve the consolidation behaviour and manage the tailings in an economical and environmentally acceptable manner. The effect of each treatment method is commonly evaluated, in part, by measuring the short- and long-term consolidation behaviour of treated samples. Geotechnical beam centrifuges, large strain consolidation apparatus, and geocolumns are typically used to measure the consolidation properties. However, these methods require many months to complete or are expensive and difficult to deploy in the field. We developed a small-scale geotechnical centrifuge suitable for use in both research environments and laboratories at industrial sites to study and/or monitor various treatment and disposal options in a short time. This paper presents the motivation for developing a small-scale centrifuge, the components and features of the centrifuge, and the assortment of tests completed to validate the apparatus and testing methods. The validation tests proved that the small-scale centrifuge produces comparable results to existing methods while reducing the cost and time required to evaluate the consolidation performance of different tailings treatment options.","PeriodicalId":48816,"journal":{"name":"International Journal of Physical Modelling in Geotechnics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139617765","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

Editorial: A new year and new advances in geotechnics 社论：新的一年，土工技术新进展

IF 1.9 4区工程技术

International Journal of Physical Modelling in Geotechnics Pub Date : 2024-01-01 DOI: 10.1680/jphmg.2024.24.1.1

Anthony F. Tessari

引用次数: 0