Studia Geotechnica et Mechanica最新文献_第9页

Analysis of the pile skin resistance formation 桩面阻力形成分析

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-11-01 DOI: 10.2478/sgem-2021-0026

Paweł Siemaszko, Z. Meyer

{"title":"Analysis of the pile skin resistance formation","authors":"Paweł Siemaszko, Z. Meyer","doi":"10.2478/sgem-2021-0026","DOIUrl":"https://doi.org/10.2478/sgem-2021-0026","url":null,"abstract":"Abstract This paper introduces a method based on a static load test which is aimed to verify the mechanism of the piles soil–skin interaction. The authors base their analysis on detailed data from static load test with extensometers on CFA piles. The main goal of the research is to determine the proper method of examining how the skin of the pile and soil interacts and apply it to practical engineering practice. As the first stage of the research is limited to the available set of piles, the authors make assumptions that will be verified on later stages of research as more data become available. The authors attempt to formulate the boundary conditions for the formation of pile skin resistance formation using mathematical physics equations to describe the phenomena. Current research proves that it is possible, with the suitable for practical engineering calculations, to describe soil–pile interaction mechanism based on static load test results. Experimental research indicated that there is possibility, for practical engineering calculations purposes, to assume that skin resistance of the pile due to depth can be presented with linear graph. The description is made upon extensometer results, but is meant to be appropriate with the standard static load test results, which provide load–settlement curve of the pile.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42350924","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

Experimental study on earth pressure reduction of waste tyre bales used as a backfill for rigid retaining structures 废弃轮胎包用作刚性挡土结构回填土的土压降低试验研究

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-11-01 DOI: 10.2478/sgem-2021-0023

A. Duda, T. Siwowski

引用次数: 1

Innovative Look at the ‘General Method’ of Assessing Buckling Resistance of Steel Structures 对评估钢结构屈曲阻力的“通用方法”进行创新

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-10-26 DOI: 10.2478/sgem-2021-0022

D. Czepiżak

{"title":"Innovative Look at the ‘General Method’ of Assessing Buckling Resistance of Steel Structures","authors":"D. Czepiżak","doi":"10.2478/sgem-2021-0022","DOIUrl":"https://doi.org/10.2478/sgem-2021-0022","url":null,"abstract":"Abstract Stability checking is an essential element of the dimensioning of steel frame structures. One of the stability checking methods allowed by EN 1993-1-1 is the so-called general method of assessing structural stability, based on buckling curves and relative structure slenderness λ¯op {bar lambda _{op}} usually determined through numerical analyses. But this method is not widely used because of the limited computing capabilities of the engineering programs dedicated to static load analyses and difficulties in interpreting the results of the computations. The commonly used computer programs enable one to determine the shape of buckling and critical load amplifier αcr, from which one cannot directly determine the risk of buckling of a real structure. This paper presents a modified and innovative approach to the general method of assessing structural stability, which uses only three parameters, that is, the type of cross section, cross-section strength utilisation and αcr, to determine a member’s/structure’s bearing capacity mobilisation from the stability condition. The problem solution is presented in the form of simple formulas and legible diagrams. Finally, synthetic conclusions are formulated.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49494568","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

Strength of industrial sandstones modelled with the Discrete Element Method 用离散元法模拟工业砂岩强度

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-10-09 DOI: 10.2478/sgem-2021-0020

P. Klejment, Robert Dziedziczak, P. Łukaszewski

引用次数: 0

An assessment of how penetration curve adjustment affects the California bearing ratio (CBR) 渗透曲线调整如何影响加州承载比(CBR)的评估

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-10-09 DOI: 10.2478/sgem-2021-0017

Łukasz Bednarek

引用次数: 0

An investigation of longwall failure using 3D numerical modelling – A case study at a copper mine 基于三维数值模拟的长壁破坏研究——以某铜矿为例

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-10-07 DOI: 10.2478/sgem-2021-0019

P. M. V. Nguyen, Tomasz Olczak, Sywester Rajwa

引用次数: 1

Contact interactions between soil and a corrugated metal sheet in soil-shell structures under construction 土壳结构中土与波纹金属板的接触相互作用

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-09-29 DOI: 10.2478/sgem-2021-0018

C. Machelski

{"title":"Contact interactions between soil and a corrugated metal sheet in soil-shell structures under construction","authors":"C. Machelski","doi":"10.2478/sgem-2021-0018","DOIUrl":"https://doi.org/10.2478/sgem-2021-0018","url":null,"abstract":"Abstract During the construction of soil-shell objects, large deformations of the shell, which is made of corrugated metal sheet, occur. This enables geodetic techniques to be used when monitoring such objects. On this basis, displacements of selected points of the shell are determined, and it is then possible to obtain bending moments, as shown in this paper. Based on measurements using strain gauges in the circumferential band of the shell, internal forces in steel are estimated. The algorithm given in the paper enables the impact of soil on the shell in the examined objects to be analysed. The proposed method of analysing forces in the contact layer becomes especially useful when the static conditions of the model of a shell, which is considered as a bar submerged unilaterally in the soil medium, are met. The paper indicates the possibility of using both measuring techniques. Calculations include a smaller share of axial forces on the contact impact during the laying phase of the backfill. The paper provides examples of the analysis of built shells and record-breaking objects, with an assessment of the effectiveness of the proposed algorithm. Good mapping of contact forces, which were calculated on the basis of bending moments, was indicated even when there was not a dense grid of measuring points. An important advantage of the algorithm involves reduction of the circumferential band that is separated from the soil-shell system to the bar, which is an element resulting from the division of the structure into subsystems.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46484687","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

A comprehensive approach to the optimization of design solutions for dry anti-flood reservoir dams 干式抗洪水库大坝设计方案优化的综合方法

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-09-01 DOI: 10.2478/sgem-2021-0016

D. Łydżba, A. Różański, M. Sobótka, Michał Pachnicz, Szczepan Grosel, J. Rainer

{"title":"A comprehensive approach to the optimization of design solutions for dry anti-flood reservoir dams","authors":"D. Łydżba, A. Różański, M. Sobótka, Michał Pachnicz, Szczepan Grosel, J. Rainer","doi":"10.2478/sgem-2021-0016","DOIUrl":"https://doi.org/10.2478/sgem-2021-0016","url":null,"abstract":"Abstract The article proposes the methodology of designing dams of dry flood control reservoirs. The algorithm is developed so as to meet all the requirements given in the Eurocode 7 and, at the same time, to be efficient in terms of necessary calculation time. Furthermore, the presented numerical procedure enables the optimization of design solutions, e.g. the depth and length of the anti-filtration barrier, by means of parametric analyses. The approach assumes the use of numerical methods, in particular, finite element (FE) analysis. Three-dimensional (3D) reconstruction of the terrain topography and subsoil layer arrangement performed in step (1) sets the base for further analyses. In step (2), the filtration phenomena are assessed based on the 3D analysis of a transient groundwater flow. In step (3), the state of displacement is evaluated and the stability is verified for all the relevant phases of construction and operation of the facility, in particular, in the course of simulated flood detention. The analyses in step (3) are carried out on 2D models corresponding to the design cross-sections of the dam. This significantly reduces the computation time (compared to 3D analysis) and, at the same time, provides a safe estimate of factor of safety. The performance of the proposed algorithm is shown on the numerical examples of the computations concerning the dam of Szalejów Górny dry anti-flood reservoir located in Poland.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49234226","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

Seismic bearing capacity of shallow strip footing embedded in slope resting on two-layered soil 两层土边坡浅条形基础抗震承载力研究

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-09-01 DOI: 10.2478/sgem-2021-0021

L. Debnath

引用次数: 1

Usefulness of the CPTU method in evaluating shear modulus G0 changes in the subsoil CPTU法评价地基剪切模量G0变化的有效性

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-08-10 DOI: 10.2478/sgem-2021-0008

Z. Młynarek, J. Wierzbicki, T. Lunne

{"title":"Usefulness of the CPTU method in evaluating shear modulus G0 changes in the subsoil","authors":"Z. Młynarek, J. Wierzbicki, T. Lunne","doi":"10.2478/sgem-2021-0008","DOIUrl":"https://doi.org/10.2478/sgem-2021-0008","url":null,"abstract":"Abstract This article contains the analysis of the correlation between the cone resistance qc from CPTU tests and shear modulus G0 determined from seismic tests SDMT and SCPTU. The analysis was performed for sands located in Poland, characterised by differential grain size distribution and origin. The significant impact of the independent variables; grain size, preconsolidation stress σ’p, geostatic vertical stress σ’v0 and relative density index on the dependencies analysed, were examined in three stages. Firstly, a general relationship between the cone resistance and shear modulus G0 was established; in the second stage, an analysis was carried out in selected groups of subsoil; and in the third stage, the influence of other independent variables was taken into account. In each stage, the functional form of the dependency was determined, and their statistical significance was assessed throughout coefficient of determination R2. For more variables, multivariable regression analysis was applied for assessment. Conducted analysis showed that the overall view of the relation between the cone resistance qc and shear modulus G0 has low evaluation of the statistical significance. This fact is consistent with the theoretical assessment of this relationship. To obtain a satisfactory assessment of this dependency, it is necessary to construct empirical equations for individual groups of soil, taking into account other independent variables; preconsolidation stress σ’p, vertical stress σ’vo and relative density index. This approach allows to assess the local correlation relationship, which is very useful during the geological project.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46310289","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