Studia Geotechnica et Mechanica最新文献_第9页

Evaluation of Tunnel Contour Quality Index on the Basis of Terrestrial Laser Scanning Data 基于地面激光扫描数据的隧道轮廓质量指标评价

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-07-06 DOI: 10.2478/sgem-2021-0013

P. Dybeł, Katarzyna Dybeł, J. Cieślik

{"title":"Evaluation of Tunnel Contour Quality Index on the Basis of Terrestrial Laser Scanning Data","authors":"P. Dybeł, Katarzyna Dybeł, J. Cieślik","doi":"10.2478/sgem-2021-0013","DOIUrl":"https://doi.org/10.2478/sgem-2021-0013","url":null,"abstract":"Abstract The Tunnel Contour Quality Index (TCI) is an index established by Kim and Bruland for an effective management of a tunnel contour quality. It is estimated on a basis of measurements of two contour profiles within a single blasting round, using a laser profiler. However, the representativeness of measurement results obtained that way for the assessment of a contour quality of the entire blasting round is disputable. Terrestrial laser scanning (TLS) technology, combined with available numerical surface modeling tools, enables development of three-dimensional models of a monitored surface. The article reports results of TCI calculations based on TLS data. The presented TLS technique is based not only on selected cross-sections of the tunnel contour but also on the description of the morphology of the tunnel contour surface. The case study concerns measurements of the “Mały Luboń” tunnel niche, located in Naprawa, Poland. The TCI values for three blasting rounds were determined in accordance with Kim and Bruland's guidelines and were compared to TCI values determined with the proposed TLS technique. On a basis of this comparison, it can be concluded that the results obtained with the TLS technique are more reliable and representative for description of the contour quality of the entire blasting round than results obtained with the laser profiling technique.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"43 1","pages":"255 - 269"},"PeriodicalIF":0.6,"publicationDate":"2021-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48304518","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

Behaviour of eccentrically inclined loaded rectangular foundation on reinforced sand 加筋砂土上偏心倾斜加载矩形基础的特性

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-06-01 DOI: 10.2478/sgem-2021-0003

Sujata Gupta, Anupam Mital

{"title":"Behaviour of eccentrically inclined loaded rectangular foundation on reinforced sand","authors":"Sujata Gupta, Anupam Mital","doi":"10.2478/sgem-2021-0003","DOIUrl":"https://doi.org/10.2478/sgem-2021-0003","url":null,"abstract":"Abstract This study presents the behaviour of model footing resting over unreinforced and reinforced sand bed under different loading conditions carried out experimentally. The parameters investigated in this study includes the number of reinforced layers (N = 0, 1, 2, 3, 4), embedment ratio (Df/B = 0, 0.5, 1.0), eccentric and inclined ratio (e/L, e/B = 0, 0.05, 0.10, 0.15) and (a = 0°, 7°, 14°). The test sand was reinforced with bi-axial geogrid (Bx20/20). The test results show that the ultimate bearing capacities decrease with axial eccentricity and inclination of applied loads. The test results also show that the depth of model footing increase zero to B (B = width of model footing), an increase of ultimate bearing capacity (UBC) approximated at 93%. Similarly, the multi-layered geogrid reinforced sand (N = 0 to 4) increases the UBC by about 75%. The bearing capacity ratio (BCR) of the model footing increases with an increasing load eccentricity to the core boundary of footing; if the load eccentricities increase continuity, the BCR decreases. The tilt of the model footing is increased by increasing the eccentricity and decreases with increasing the number of reinforcing layers.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"43 1","pages":"74 - 89"},"PeriodicalIF":0.6,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42931925","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

Geostatistical analysis of spatial variability of the liquefaction potential – Case study of a site located in Algiers (Algeria) 液化潜力空间变异性的地质统计分析——阿尔及尔（阿尔及利亚）一个场地的案例研究

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-06-01 DOI: 10.2478/sgem-2021-0009

Salah Eddine Bouguerba, Djawad Zandagui, Souad Benhchilif

{"title":"Geostatistical analysis of spatial variability of the liquefaction potential – Case study of a site located in Algiers (Algeria)","authors":"Salah Eddine Bouguerba, Djawad Zandagui, Souad Benhchilif","doi":"10.2478/sgem-2021-0009","DOIUrl":"https://doi.org/10.2478/sgem-2021-0009","url":null,"abstract":"Abstract The city of Algiers (Algeria) is a highly seismic area, and therefore, soil liquefaction poses a major concern for structures resting on sandy soil. A campaign of 62 static penetration tests or cone penetrometer tests (CPT) was carried out on a site located in the commune of Dar El Beïda in Algiers. The soil Liquefaction Potential Index (LPI) values were assessed, for each borehole, based on the simplified procedure of Seed and Idriss. On the other hand, the geographic information system and geostatistical analysis were used to quantify the risk of soil liquefaction at the studied site. It is worth mentioning that the (LPI) was taken as a regionalized variable. In addition, the experimental variogram was modeled on the basis of a spherical model. Also, the interpolation of the LPI values in the unsampled locations was performed by the Kriging technique using both isotropic and anisotropic models. Kriging standard deviation maps were produced for both cases. The cross-validation showed that the anisotropic model exhibited a better fit for the interpolation of the values of the soil liquefaction potential. The results obtained indicated that a significant part of the soil is liable to liquefy, in particular in the northwestern region of the study area. The findings suggest that there is a proportional relationship between the risk of liquefaction and the increase or decrease in seismic acceleration.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"43 1","pages":"155 - 168"},"PeriodicalIF":0.6,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49276262","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

Safety analysis of the Żelazny Most tailings pond: qualitative evaluation of the preventive measures effectiveness Żelazny大部分尾矿库的安全性分析:预防措施效果的定性评价

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-06-01 DOI: 10.2478/sgem-2021-0011

D. Łydżba, A. Różański, Maciej Sobótka, Michał Pachnicz, Szczepan Grosel, M. Tankiewicz, P. Stefanek

引用次数: 2

Termite Mound Soils for Sustainable Production of Bricks 白蚁丘土壤用于砖的可持续生产

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-06-01 DOI: 10.2478/sgem-2021-0006

Alemu Mosisa Legese, Tesfaye Geneti Kenate, Fekadu Fufa Feyessa

{"title":"Termite Mound Soils for Sustainable Production of Bricks","authors":"Alemu Mosisa Legese, Tesfaye Geneti Kenate, Fekadu Fufa Feyessa","doi":"10.2478/sgem-2021-0006","DOIUrl":"https://doi.org/10.2478/sgem-2021-0006","url":null,"abstract":"Abstract The article presents the alternative use of termite mound soils (TMSs) as full replacement for clay soils in brick production. TMSs from two localities, Jawaj and Sene, in Ethiopia were investigated for bricks production. The TMSs samples contained high SiO2 and Al2O3. The TMSs bricks were fired at different temperatures from 500 to 1,000°C. The obtained mean compressive strengths (σ), 18 and 14 MPa, were observed for bricks made from TMSs from Jawaj and Sene, respectively, at the optimum firing temperature of 700°C. The σ of TMSs bricks decreased as the firing temperature increased above 700°C, while for conventional clay soil brick, the σ increased with temperature beyond 700°C. The water absorptions and saturation coefficients of fired TMSs bricks decreased with increased firing temperature. The TMSs bricks meet the standard specification of dimension tolerance only along the height. All the TMSs bricks made from the two localities were not efflorescent. TMSs from Jawaj and Sene sites can be used as a raw material to replace the long-used clay soils for bricks production as a construction material for houses construction in rural and urban areas.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"43 1","pages":"142 - 154"},"PeriodicalIF":0.6,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46821515","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

Application of the thermoporoelasticity model in numerical modelling of underground coal gasification influence on the surrounding medium 热孔弹性模型在煤地下气化对周围介质影响数值模拟中的应用

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-06-01 DOI: 10.2478/sgem-2021-0004

Anna Uciechowska-Grakowicz, T. Strzelecki

{"title":"Application of the thermoporoelasticity model in numerical modelling of underground coal gasification influence on the surrounding medium","authors":"Anna Uciechowska-Grakowicz, T. Strzelecki","doi":"10.2478/sgem-2021-0004","DOIUrl":"https://doi.org/10.2478/sgem-2021-0004","url":null,"abstract":"Abstract The purpose of this paper was to present the thermoporoelasticity model adapted for application in modelling processes, where phase transition may occur, such as during underground coal gasification (UCG). The mathematical model of the medium (soil/rock with pores filled with liquid/gas) in non-isothermal conditions is based on Biot's poroelasticity model. The poroelasticity model is expanded here by the influence of temperature and adjusted to the case where both liquid and highly compressible fluid are present in pores by using the gas laws. This requires considering temperature-dependent physical quantities such as pore fluid density, heat transfer coefficient and viscosity as functions of temperature. Based on the proposed mathematical model and the finite element method, a numerical model was built for the purpose of computing processes occurring in the vicinity of the UCG generator. The result of the authors’ work is a three-dimensional (3D) model, which was not only modified, but derived straight from the laws of thermodynamics, where fields of displacement, temperature and fluid flow are coupled. The model makes it possible to determine results significant to modelling of the UCG process, the reach of the gaseous phase's presence in pores, subsidence values, temperature distribution and directions and rate of seepage, without losing the simplicity and elegance of Biot's original concept. Next, the results of simulations for a hypothetical deposit to estimate the environmental impact of UCG are presented. After applying specific geometry and parameters, the model can be useful for verifying if the chosen technology of UCG in specific conditions will be safe for the environment and infrastructure.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"43 1","pages":"116 - 134"},"PeriodicalIF":0.6,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46120212","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

Load capacity of the mixed bench and slab foundation. Numerical simulations and analytical calculation model 台板混合基础的承载能力。数值模拟及解析计算模型

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-06-01 DOI: 10.2478/sgem-2021-0005

M. Grodecki

引用次数: 1

Impact of subgrade and backfill stiffness on values and distribution of bending moments in integral box bridge 路基和回填体刚度对整体箱桥弯矩值及分布的影响

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-06-01 DOI: 10.2478/sgem-2021-0001

Andrzej Helowicz

引用次数: 0

Laboratory tests and analysis of CIPP epoxy-resin internal liners used in pipelines – part I: comparison of tests and engineering calculations 管道用CIPP环氧树脂内胆的实验室试验和分析。第1部分:试验和工程计算的比较

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-06-01 DOI: 10.2478/sgem-2021-0002

T. Abel

{"title":"Laboratory tests and analysis of CIPP epoxy-resin internal liners used in pipelines – part I: comparison of tests and engineering calculations","authors":"T. Abel","doi":"10.2478/sgem-2021-0002","DOIUrl":"https://doi.org/10.2478/sgem-2021-0002","url":null,"abstract":"Abstract Tests that were carried out in order to obtain knowledge of the actual values of strength parameters obtained by CIPP liners that are used to repair pipelines. Specimens of liners made of high quality polyester felt cured with epoxy resin were subjected to tests. The scope of the performed studies corresponded with the scope of acceptance tests, which are carried out in the investment process during quality control of renovation works. Specimens of liners taken from sewers with 3 different diameters, i.e. 200mm, 350mm and 500mm were selected as representative for underground sewage networks. The obtained results enabled the calculations carried out in the course of design work to be verified, and differences between the model values of the strength parameters obtained from the calculations, and real values that are burdened with irregularities resulting from the conditions prevailing at a construction site and which were obtained for specimens taken from their built-in locations to be compared. The tests confirmed that it is possible to renovate - using CIPP liners - sewers with a lot of structural and material damage that negatively affects a liner‘s geometry. The implementation of the reinforcing internal coating in a sewer enables its further safe operation. The direct application value of the research involves the enlargement and clarification of knowledge concerning the actual load-bearing capacity of CIPP liners.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"43 1","pages":"169 - 180"},"PeriodicalIF":0.6,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42801059","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

An Analytical Study of Partially Strengthened Single End-Bearing Granular Pile Near the Top and Bottom 近顶、近底单端承重颗粒桩局部加固分析研究

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2021-06-01 DOI: 10.2478/sgem-2021-0010

V. Garg, J. Sharma, Ashish Solanki

引用次数: 0