Studia Geotechnica et Mechanica最新文献_第2页

Influence of Soft Soil Samples Quality on the Compressibility and Undrained Shear Strength – Seven Lessons Learned From the Vistula Marshlands 软土试样质量对压缩性和不排水抗剪强度的影响——以维斯瓦湿地为例

Studia Geotechnica et Mechanica Pub Date : 2023-09-30 DOI: 10.2478/sgem-2023-0012

Jakub Konkol

{"title":"Influence of Soft Soil Samples Quality on the Compressibility and Undrained Shear Strength – Seven Lessons Learned From the Vistula Marshlands","authors":"Jakub Konkol","doi":"10.2478/sgem-2023-0012","DOIUrl":"https://doi.org/10.2478/sgem-2023-0012","url":null,"abstract":"Abstract This technical article presents the influence of sample quality on the compressibility parameters and undrained shear strength ( c u ) of soft soils from the Vistula Marshlands. The analysis covers: (1) quality of soft soil according to three criteria: void ratio (Δ e / e 0 index), volumetric strain (Δ ɛ v ) and C r / C c ratio; (2) influence of storage time on quality; (3) influence of sample quality on undrained shear strength ( c u ), and (4) reliability of compression and undrained shear strength parameters estimation. The sample quality of three different soft soils (peat, organic clays, and organic silts) was investigated using dataset of geotechnical investigations from the Vistula Marshlands. The reliability of oedometer tests and compressibility parameters determination was shown. Different undrained shear strength estimates (from lab and field tests) were juxtaposed with sample quality. In situ estimates of undrained shear strength were compared with results of triaxial tests and direct simple shear test on reconstituted samples as well as SHANSEP estimates. The results of research are grouped in seven lessons. The most important outcomes are: (1) the quality of samples is at best moderate or poor and there is no significant influence of storage time on sample quality, (2) regardless of testing method, the undrained shear strength natural variability of the Vistula Marshlands soft soils is between 20% and 50% depending on deposit depth and soil type, (3) the most accurate estimation of undrained shear strength can be obtained from field vane test (FVT) while unconsolidated, undrained compression (UUC) triaxial tests should be avoided, (4) SHANSEP approach can be considered as a valuable estimate of c u (next to the FVTs), which additionally allows in relatively easy way to establish lower and upper bounds of c u .","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136280609","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

Estimation of Screw Displacement Pile-Bearing Capacity Based on Drilling Resistances 基于钻孔阻力的螺旋位移桩承载力估算

Studia Geotechnica et Mechanica Pub Date : 2023-09-30 DOI: 10.2478/sgem-2023-0014

Adam Krasiński

{"title":"Estimation of Screw Displacement Pile-Bearing Capacity Based on Drilling Resistances","authors":"Adam Krasiński","doi":"10.2478/sgem-2023-0014","DOIUrl":"https://doi.org/10.2478/sgem-2023-0014","url":null,"abstract":"Abstract This article presents an engineering, empirical method of estimating the bearing capacity and settlement characteristics Q-s of screw displacement piles and columns, based on soil resistance encountered during the drilling to form piles/columns in the ground. The method was developed on the basis of correlation analyses of the test results of 24 piles made during the “DPDT-Auger” research project (Krasiński et al., 2022a). In the proposed method, the load capacity of a screw displacement pile is estimated using two main parameters of auger screwing resistance: torque M T and the number of auger rotations per depth unit n R . The method applies to piles and columns made with a standard screw displacement pile (SDP) auger and with the proprietary, prototype DPDT ( displacement pile drilling tool ) aguer, patented in Poland (2020). Based on the estimated ultimate capacities of the pile shaft and base, an approximate method of predicting the pile settlement characteristics Q-s was also proposed, using the transfer function method. This article describes a correlation procedure of field test results together with their statistical analysis and presents a method of estimating the pile-bearing capacity based on correlation results. A calculation example is also provided. The conclusion looks at the useful practical applications that could be found for the proposed method.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136280295","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

Stress–dilatancy behaviour of remoulded Fujinomori clay 重塑藤森黏土的应力-剪胀特性

Studia Geotechnica et Mechanica Pub Date : 2023-09-13 DOI: 10.2478/sgem-2023-0010

Zenon Szypcio, Katarzyna Dołżyk-Szypcio

引用次数: 0

Compressive and Tensile Strength of Nano-clay Stabilised Soil Subjected to Repeated Freeze–Thaw Cycles 反复冻融循环作用下纳米粘土稳定土的抗压和抗拉强度

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2023-09-01 DOI: 10.2478/sgem-2023-0009

M. Roustaei, Mahdi Sabetraftar, E. Taherabadi, M. Bayat

{"title":"Compressive and Tensile Strength of Nano-clay Stabilised Soil Subjected to Repeated Freeze–Thaw Cycles","authors":"M. Roustaei, Mahdi Sabetraftar, E. Taherabadi, M. Bayat","doi":"10.2478/sgem-2023-0009","DOIUrl":"https://doi.org/10.2478/sgem-2023-0009","url":null,"abstract":"Abstract Improvement of the mechanical properties of clayey soils by additional elements to enhance the strength under numerous freezing and thawing cycles has been considered as a serious concern for engineering applications in cold regions. The objective of the current study is to investigate the effect of nano-clay as a stabiliser on the mechanical properties of clay. To this end, the clay specimens were prepared by adding various percentages of nano-clay ranging from 0.5% to 3% by dry weight of soil and were experimentally tested under the uniaxial compression and tensile splitting tests under different curing times (0, 7 and 28 days) after experiencing various freeze–thaw cycles ranging from 0 to 11. It can be concluded from the results that nano-clay particles may be used as a stabiliser in geotechnical applications to improve soil property. The results indicate that the optimum moisture content (OMC) of specimens increases and the maximum dry density (MDD) decreases with the increasing nano-clay content. The specimens containing about 1% nano-clay recorded maximum values of unconfined compressive strength (UCS) as well as tensile strength. For example, the addition 1% nano-clay increased the UCS and tensile values of clay specimens under the curing time of 28 days by 34% and 247%, respectively. In addition, the long-term durability of specimens against freeze–thaw cycles increases further with the addition of nano-clay content ranging from 2% to 3%.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42793595","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

Shell Deformation During the Construction of Record Span Soil-steel Buried Structure in Ras-Al-Khaimah (UAE) 阿拉伯联合酋长国Ras-Al-Khaimah纪录跨土钢埋地结构施工过程中的壳变形

Studia Geotechnica et Mechanica Pub Date : 2023-09-01 DOI: 10.2478/sgem-2023-0007

Czesław Machelski, Piotr Tomala

引用次数: 0

An elastoplastic constitutive model for assessing ground settlements induced by deep excavations 深基坑地面沉降的弹塑性本构模型

Studia Geotechnica et Mechanica Pub Date : 2023-09-01 DOI: 10.2478/sgem-2023-0011

Hiba El-Arja, Sébastien Burlon, Emmanuel Bourgeois

{"title":"An elastoplastic constitutive model for assessing ground settlements induced by deep excavations","authors":"Hiba El-Arja, Sébastien Burlon, Emmanuel Bourgeois","doi":"10.2478/sgem-2023-0011","DOIUrl":"https://doi.org/10.2478/sgem-2023-0011","url":null,"abstract":"Abstract Ground movements induced by deep excavations may cause damages on neighboring existing buildings. Finite element simulations generally give acceptable estimates of the horizontal displacements of the retaining wall, but results are less satisfactory for the vertical displacements of the ground surface behind the structure. A possible explanation is that most constitutive models describe volumetric strains in a simplified way. This paper proposes an elastoplastic constitutive model aimed at improving the prediction of vertical displacements behind retaining walls. The model comprises a single plastic mechanism with isotropic strain hardening, but has a specific flow rule that allows to generate contractive plastic strains. Identification of the parameters based on triaxial tests is explained and illustrated by an example of calibration. A numerical analysis of a well-documented sheet pile wall in sand in Hochstetten (Germany) is presented. The results given by the model are compared with the measurements and with those obtained using the Hardening Soil Model. The potential advantages of the proposed model are then discussed.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135484322","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

Vibration monitoring of structures in the light of the Polish and international requirements 根据波兰和国际要求对结构进行振动监测

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2023-06-27 DOI: 10.2478/sgem-2023-0008

A. Herbut, A. Jakubczyk-Gałczyńska, M. Wyjadłowski

引用次数: 0

A Novel Method for Optimizing Parameters influencing the Bearing Capacity of Geosynthetic Reinforced Sand Using RSM, ANN, and Multi-objective Genetic Algorithm 基于RSM、ANN和多目标遗传算法优化土工合成砂承载力参数的新方法

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2023-05-31 DOI: 10.2478/sgem-2023-0006

Brahim Lafifi, A. Rouaiguia, E. Soltani

{"title":"A Novel Method for Optimizing Parameters influencing the Bearing Capacity of Geosynthetic Reinforced Sand Using RSM, ANN, and Multi-objective Genetic Algorithm","authors":"Brahim Lafifi, A. Rouaiguia, E. Soltani","doi":"10.2478/sgem-2023-0006","DOIUrl":"https://doi.org/10.2478/sgem-2023-0006","url":null,"abstract":"Abstract In this study, a novel method is proposed to optimize the reinforced parameters influencing the bearing capacity of a shallow square foundation resting on sandy soil reinforced with geosynthetic. The parameters to be optimized are reinforcement length (L), the number of reinforcement layers (N), the depth of the topmost layer of geosynthetic (U), and the vertical distance between two reinforcement layers (X). To achieve this objective, 25 laboratory small-scale model tests were conducted on reinforced sand. This laboratory-scale model has used two geosynthetics as reinforcement materials and one sandy soil. Firstly, the effect of reinforcement parameters on the bearing load was investigated using the analysis of variance (ANOVA). Both response surface methodology (RSM) and artificial neural networks (ANN) tools were applied and compared to model bearing capacity. Finally, the multiobjective genetic algorithm (MOGA) coupled with RSM and ANN models was used to solve multi objective optimization problems. The design of bearing capacity is considered a multi-objective optimization problem. In this regard, the two conflicting objectives are the need to maximize bearing capacity and minimize the cost. According to the obtained results, an informed decision regarding the design of the bearing capacity of reinforced sand is reached.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"45 1","pages":"174 - 196"},"PeriodicalIF":0.6,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42536197","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 of Steel Arch Support Operation During Rock Bursts Under Explosive Atmosphere Conditions 爆炸环境下岩石爆破钢拱支护作业的安全性

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2023-03-17 DOI: 10.2478/sgem-2023-0004

A. Pytlik, W. Frąc

{"title":"Safety of Steel Arch Support Operation During Rock Bursts Under Explosive Atmosphere Conditions","authors":"A. Pytlik, W. Frąc","doi":"10.2478/sgem-2023-0004","DOIUrl":"https://doi.org/10.2478/sgem-2023-0004","url":null,"abstract":"Abstract Methane and coal dust explosions are among the most common causes of disasters in hard coal mining. Therefore, it is important for occupational safety in hard coal mines operating under methane and coal dust explosion hazards to identify possible ignition sources, whether due to natural or technical factors. One technical source of ignition can be mechanical sparks generated during operation of mechanical equipment and high surface temperatures of equipment components during operation. This paper presents the methodology and results of thermal imaging and strength testing of roadway support elements under dynamic loading. The goal of the tests was to identify the potential explosive atmosphere ignition sources during the operation of the support under the conditions of rock bursts. The scope of testing encompassed the temperature measurements by means of thermal camera of friction prop and yielding support frame sliding joint elements at yield under dynamic impact loading (simulating a burst). Significant joint element heating and mechanical sparking was observed during the testing of arching yielding support frame sliding joints and straight friction prop joints as a result of friction at yield. Some of the aspects defined in standard PN-EN ISO80079-36:2016 include the maximum temperature T max =150°C for a surface that can accumulate a layer of coal dust. Tests of the friction joints have shown that during impact loading, numerous mechanical sparks are produced at the friction joints of sections of the steel prop, with the surface temperature of the sections starting from 169.6°C and reaching up to 234.1°C. During tests it was also to determined emissivites of the tested sliding joints constructed from V29-V32 secrions depending on corrosion products which consist in range 0.842–0.873. Such a high temperature can initiate an explosive mixture consisting of methane, air and coal dust.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":"45 1","pages":"144 - 157"},"PeriodicalIF":0.6,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43549540","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

The new railway hybrid bridge in Dąbrowa Górnicza: innovative concept using new design method and results of load tests Dąbrowa Górnicza新铁路混合桥:采用新设计方法的创新概念和荷载试验结果

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2023-03-09 DOI: 10.2478/sgem-2023-0002

W. Lorenc, B. Bartoszek

引用次数: 0