Studia Geotechnica et Mechanica最新文献_第5页

Overstrength and ductility factors of XBF structures with pinned and fixed supports 带固定和钉撑的XBF结构的超强和延性系数

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2023-01-25 DOI: 10.2478/sgem-2022-0028

D. Yahmi, T. Branci, A. Bouchaïr, E. Fournely

引用次数: 0

Bearing Capacity Evaluation of Shallow Foundations on Stabilized Layered Soil using ABAQUS 基于ABAQUS的稳定层状土浅基础承载力评价

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-12-25 DOI: 10.2478/sgem-2022-0026

Avinash Bhardwaj, R. Sharma

{"title":"Bearing Capacity Evaluation of Shallow Foundations on Stabilized Layered Soil using ABAQUS","authors":"Avinash Bhardwaj, R. Sharma","doi":"10.2478/sgem-2022-0026","DOIUrl":"https://doi.org/10.2478/sgem-2022-0026","url":null,"abstract":"Abstract In this paper, the finite element method (FEM) is applied to calculate the bearing capacity of two footings having the aspect ratio L/B (where L and B are the length and width of the footing, respectively) equal to 1, 2 resting on one-layer and two-layer soil. Soil profile contains two soil types including sand and clay. The soil strip is 500mm × 500mm × 350mm; however, only a quarter of the model (250mm × 250mm × 350mm) is examined in the study. Two primary situations are investigated in this study. In the first situation, the one-layer system is supposed to be sandy soil with footing overlays on medium-dense sand. The soft clay/stabilized clayey layer is supposed to be on top of the sandy soil in the second condition, with the footing resting on top of the soft clay/stabilized clay. The influence of layer thickness, aspect ratio, and material property on the bearing capacity value and footing failure mechanism is studied for eight different combinations of layered soil. The bearing capacity for a one-layer case is also estimated, and it agrees well with Vesic (1973), Hansen (1970), and Terzaghi's (1943) equations. The bearing capacity of footings is observed to decline when the height of unstabilized clayey soil increases, and it increases when clayey soil is stabilized with molasses, waste foundry sand, and lime alone and in combination with each other.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41480081","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: 3

An analytical model to predict water retention curves for granular materials using the grain-size distribution curve 利用粒度分布曲线预测颗粒材料保水曲线的分析模型

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-12-01 DOI: 10.2478/sgem-2022-0025

Linda Bouacida, Sadok Feia, Sidali Denine, N. Della

{"title":"An analytical model to predict water retention curves for granular materials using the grain-size distribution curve","authors":"Linda Bouacida, Sadok Feia, Sidali Denine, N. Della","doi":"10.2478/sgem-2022-0025","DOIUrl":"https://doi.org/10.2478/sgem-2022-0025","url":null,"abstract":"Abstract The present work aims to propose a new analytical model intended to predict the water retention curves for granular materials based on data from tensiometric tests. Different analytical models have been used for the evaluation of soil water retention curves so far. It should be noted that the proposed model considers only one criterion in the selection of soils. This criterion is the physical property of particle distribution curve that can be used to determine the values of D50 and CU. In this study, the pore-access size distribution is investigated considering the effect of the coefficient of uniformity of sandy soils that were prepared with different density indexes (0.5, 0.7, and 0.9). Moreover, the proposed model equation is based on the physical properties of soil. This equation made it possible to describe the water retention curve and to estimate the pore-access size distribution without performing any experimental tests. The findings allowed asserting that the uniformity of the particle size curves corresponds to a good uniformity of the pore-access size distribution. In addition, it was revealed that the suction increased as the density index went up, which matches well with the experimental data. Moreover, it may clearly be noted that the distinctive retention properties of unsaturated soils can be observed on the abovementioned curves. Further, it was found that the ratio of the grain size over the pore-access size increased as the uniformity coefficient augmented.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49456008","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

Impact of longwall mining on slope stability – A case study 长壁开采对边坡稳定性的影响——一个案例研究

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-11-27 DOI: 10.2478/sgem-2022-0019

P. M. V. Nguyen

{"title":"Impact of longwall mining on slope stability – A case study","authors":"P. M. V. Nguyen","doi":"10.2478/sgem-2022-0019","DOIUrl":"https://doi.org/10.2478/sgem-2022-0019","url":null,"abstract":"Abstract In recent decades, many open pit (OP) mines have either already made the decision or are at the planning stage to change their mining activity from OP to underground (UG) to remain competitive. Technically, before the OP ends its operation, both OP and UG mining will have to be operated simultaneously for a certain period of time. It is well known that UG operation causes subsidence, discontinuous deformations, and changes in hydrogeological conditions. In case of UG operation located below the OP mine, slope deformation can be expected as a result of subsidence induced by UG exploitation. This paper presents a numerical analysis of slope stability under the influence of the longwall mining operation at the Cao Son OP mine in Vietnam. All calculation variants were performed using the Finite Difference Method code, FLAC. In order to evaluate slope stability of the OP slope, various geometry configurations showing advances of both OP and UG extractions were examined. Based on the outcomes, assessments on OP slope are presented, and then, practical actions regarding the location and direction of UG extraction are recommended, with an aim to minimize the impact of underground mining on OP slope.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46146807","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

Reviews on Finite Element Modeling Practices of Stone Columns for Soft Soil Stabilization Beneath an Embankment Dam 路堤坝下软土石柱稳定有限元模拟研究进展

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-11-27 DOI: 10.2478/sgem-2022-0024

D. K. Teshager, Henok Lemma Belayneh

引用次数: 0

Proposal of concept for structural modelling of hybrid beams 混合梁结构建模概念的提出

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-11-21 DOI: 10.2478/sgem-2022-0023

M. Kożuch, Łukasz Skrętkowicz

{"title":"Proposal of concept for structural modelling of hybrid beams","authors":"M. Kożuch, Łukasz Skrętkowicz","doi":"10.2478/sgem-2022-0023","DOIUrl":"https://doi.org/10.2478/sgem-2022-0023","url":null,"abstract":"Abstract Investigation on the behaviour of a hybrid beam is presented. Hybrid beam stands for an element with hybrid cross sections. This means sections that consist of steel and concrete parts, connected together with composite dowels, and both are considered for shear flow analysis. In practice, a more general solution may be used for bridges in the form of a beam in which the span sections are hybrid and the support sections are concrete. Recently such a solution has been introduced for bridge engineering in Poland and a new problem with performing a global analysis of hybrid beams was identified. The solution is new itself and requires also a new approach for internal forces determination. Discussion of this problem is made in the paper. Influences of (1) concrete cracking, (2) rheology of concrete and (3) methods of modelling on the redistribution of internal forces are highlighted. On an example of one of the real bridge girder (being currently under design) analysis is made to show how the abovementioned factors are affecting obtained results. Results are analysed and conclusions are presented. As a final step, a new concept of hybrid beam design is proposed. The proposed solution enables a quick and easy engineering approach to perform a static calculation of the considered structure.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68916890","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

Parametric study of the earth dam's behaviour subjected to earthquake 地震作用下土坝性能的参数研究

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-11-18 DOI: 10.2478/sgem-2022-0017

H. Ayeche, Z. Zitouni, A. Limam, Ali Bouafia

{"title":"Parametric study of the earth dam's behaviour subjected to earthquake","authors":"H. Ayeche, Z. Zitouni, A. Limam, Ali Bouafia","doi":"10.2478/sgem-2022-0017","DOIUrl":"https://doi.org/10.2478/sgem-2022-0017","url":null,"abstract":"Abstract Static stability of an earth dam can be established by estimating the static safety factor equal to the ratio of the shear strength to the shear stress along a critical sliding area. In contrast, it is more complicated to evaluate the dynamic stability during an earthquake. The water filling the interstices of the earth dams cannot drain during the short duration of an earthquake. An excess pore water pressure ΔU develops, and its role is predominant in the destabilisation of the dam. The pore water increase causes a decrease in the soil shear strength. It is, therefore, crucial to evaluate and take into consideration ΔU in the dam dynamic stability analysis. This research is a contribution to reach this objective. A parametric study was conducted by varying the physical and mechanical soil characteristics constituting the dam, as well as its geometrical values, in order to evaluate their effects on the dynamic safety factor. The dynamic safety factor is calculated using the pseudo-static method, taking into account the excess pore water pressure that develops during cyclic loading into the granular soil of the earth dam upstream face. The results of the parametrical analytical study were also compared to the results of numerical simulations of the dam seismic stability trough pseudo-static method. The numerical simulations were done with three different software: PLAXIS and ABAQUS (based on the finite element method) and GEOSTAB (deals with the problem at the limit equilibrium using the simplified Bishop method). At the end, on one hand, we were able to describe how and at what level of the dam upstream face the sliding occurs, and on the other hand, we were able to underline the adequate combination between the dam geometric parameters and the mechanical soil characteristics which may ensure seismic stability.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47756020","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

Settlement Analysis of a Sandy Clay Soil Reinforced with Stone Columns 碎石桩加固砂土的沉降分析

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-11-06 DOI: 10.2478/sgem-2022-0020

Y. Boru, Adamu Beyene Negesa, G. Scaringi, W. Puła

引用次数: 5

The evolution of the shape of composite dowels 复合材料榫钉形状的演变

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-11-06 DOI: 10.2478/sgem-2022-0021

W. Lorenc, G. Seidl, J. Berthellemy

{"title":"The evolution of the shape of composite dowels","authors":"W. Lorenc, G. Seidl, J. Berthellemy","doi":"10.2478/sgem-2022-0021","DOIUrl":"https://doi.org/10.2478/sgem-2022-0021","url":null,"abstract":"Abstract Composite dowels have opened new possibilities for engineers designing composite structures. The fundamental and most important characteristic of composite dowels is the shape of the cutting line. It is important to understand why only one particular shape of the cutting line is used in bridge engineering, while so many different shapes have been investigated by many researchers. The essential part of the process of developing composite dowels – the development of the shape of the cutting line – is presented in this paper. The influence of the steel web thickness is presented, and technological problems of steel fabrication are highlighted. The role of empirical experience from the first bridges, push-out tests, and finite element simulations is presented. Assumptions for numerical procedures are given. The distinction between the steel failure and concrete failure modes is introduced for composite dowels. The paper presents how the concept of “shape” was divided into “shape,” “ratio,” and finally “size,” and how, because of the fatigue problems in bridges, all the three factors have emerged to result in the form of shapes that can satisfy the requirements for bridges. Research leading to the invention of the first version of the clothoidal shape is presented.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43147786","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

Resonance of a structure with soil elastic waves released in non-linear hysteretic soil upon unloading 非线性滞回土中土弹性波作用下结构的卸载共振

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-09-22 DOI: 10.2478/sgem-2022-0015

P. Kowalczyk

{"title":"Resonance of a structure with soil elastic waves released in non-linear hysteretic soil upon unloading","authors":"P. Kowalczyk","doi":"10.2478/sgem-2022-0015","DOIUrl":"https://doi.org/10.2478/sgem-2022-0015","url":null,"abstract":"Abstract High-frequency motion is often observed in small-scale experimental works carried out in flexible containers under simplified seismic loading conditions when single harmonic sine input motions are introduced at the base of a soil specimen. The source of the high-frequency motion has often been sought in experimental inaccuracies. On the other hand, the most recent numerical studies suggested that high-frequency motion in the steady-state dynamic response of soil subjected to harmonic excitation can also be generated as a result of soil elastic waves released in non-linear hysteretic soil upon unloading. This work presents an example of a finite element numerical study on seismic soil–structure interaction representative of an experimental setup from the past. The results show how high-frequency motion generated in soil in the steady-state response, apparently representative of soil elastic waves, affects the steady-state response of a structure, that is, it is presented how the structure in the analysed case resonates with the soil elastic waves. The numerical findings are verified against the benchmark experimental example to indicate similar patterns in the dynamic response of the structure.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42504540","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