Studia Geotechnica et Mechanica最新文献_第6页

Effect of suction on the mechanical behaviour of unsaturated compacted clay–sand mixtures 吸力对非饱和压实粘土-砂混合料力学特性的影响

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-09-01 DOI: 10.2478/sgem-2022-0016

Salima Bouchemella, S. Taibi

{"title":"Effect of suction on the mechanical behaviour of unsaturated compacted clay–sand mixtures","authors":"Salima Bouchemella, S. Taibi","doi":"10.2478/sgem-2022-0016","DOIUrl":"https://doi.org/10.2478/sgem-2022-0016","url":null,"abstract":"Abstract In this work, a series of unconfined compression tests at different water contents were performed to investigate the mechanical behaviour of clay–sand mixtures compacted in standard Proctor conditions. For studying the effect of water content and suction on unconfined compressive strength (UCS) and on strain secant modulus (E50 modulus) of these mixtures, drying–wetting paths were defined by measuring the soil–water characteristic curves (SWCCs) using osmotic and salt solution techniques and filter paper method. The results highlighted that an increase in sand content of the mixture leads to an increase in the maximum dry densities and a decrease in the optimum water content of the materials. However, at the given state, when clay is mixed with 25% of sand, the UCS and E50 modulus increase to 37% and 70%, respectively, compared to those of clayey samples. But when clay is mixed with 50% of sand, the UCS and E50 modulus decrease to 38% and 46%, respectively, compared to those of clayey samples. The results also indicate that the UCS and E50 increase with a decrease in the water content and an increase in suction, irrespective of the sand content.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44816731","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

Effect of Time History on Long-Term Deformation of Gypseous Soils 时间历史对石膏土长期变形的影响

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-09-01 DOI: 10.2478/sgem-2022-0011

M. Fattah, Y. J. al-Shakarchi, Huda N. T. AL-Numani

{"title":"Effect of Time History on Long-Term Deformation of Gypseous Soils","authors":"M. Fattah, Y. J. al-Shakarchi, Huda N. T. AL-Numani","doi":"10.2478/sgem-2022-0011","DOIUrl":"https://doi.org/10.2478/sgem-2022-0011","url":null,"abstract":"Abstract The time-dependent behavior of three gypseous soils was investigated. The soils had gypsum content of 66%, 44%, and 14.8%. The mineralogical and chemical properties of the soils were determined. Two series of tests were performed. In the first, collapsibility characteristics were investigated for a long period (60 days) by conducting single and double oedometer tests. In the second series, the effect of relative density on collapse with time was investigated. The samples were compacted to 40%, 50%, and 60% relative density and then tested. The results of collapse tests showed that the relationship between the strain and logarithm of effective stress has two vertical lines. The first one represents the collapse settlement taking place within 24 h, while the second one represents the long-term collapse. The collapse potential (CP) in both single and double oedometer tests increases when the gypsum content increases from 14.8% to 66% and when the initial void ratio increases. The CP–logarithm of time relationship for soaked samples prepared at different relative densities under 800 kPa indicated that the CP increased with time for the soil sample compacted at 60% relative density and the increase was higher than those compacted at 40% and 50% relative density. The curves started with a straight line and then a concave downward curve was observed with a high strain. For samples compacted at 40% and 50% relative densities, the curves were interrupted by little soil collapses, while the third curve exhibited smooth relation following the collapse.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45314825","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: 4

Does water lubrication affect friction differently for rocks and soils? Evidence and open questions 水润滑对岩石和土壤的摩擦影响不同吗?证据和开放性问题

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-07-27 DOI: 10.2478/sgem-2022-0014

F. Cafaro, A. Hamad, L. Monterisi

引用次数: 0

Behavior of Vertically Confined Square Footing on Reinforced Sand under Centric Inclined Loading 中心倾斜荷载作用下加筋土上竖向约束方形基础的性能

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-07-27 DOI: 10.2478/sgem-2022-0012

B. Kirtimayee, N. K. Samadhiya

{"title":"Behavior of Vertically Confined Square Footing on Reinforced Sand under Centric Inclined Loading","authors":"B. Kirtimayee, N. K. Samadhiya","doi":"10.2478/sgem-2022-0012","DOIUrl":"https://doi.org/10.2478/sgem-2022-0012","url":null,"abstract":"Abstract This study presents the behavior of vertically confined square footing on geogrid-reinforced sand under centric inclined loading through a series of experimental tests. The load was applied at 5°, 10° and 20° angles of inclination with the vertical. The tests were conducted on surface footing, footing with confiner and footing with confiner and horizontal reinforcement configurations subjected to inclined loading. Parametric variations like depth of the confiner (d=1B, 1.5B, 2B), number of geogrid layers (N; varies with variation in depth of confiner), and spacing between horizontal reinforcements (Y=0.25B, 0.5B, 0.75B, 1B) have been investigated at the top surface dimension of confiner (D) as 1.0B, 1.5B and 2.0B (where B is the width of the model footing). Results show that combined effect of confiner and horizontal reinforcement increases the ultimate bearing capacity of footing significantly compared to only confiner for all angle of inclinations. It can also be observed that load bearing capacities decrease with increase in angles of inclination and record the minimum improvement at 20° angle of inclination. Improvement in bearing capacities and reduction in settlement of footing analyzed in terms of bearing capacity ratio (BCR) and settlement reduction factor (SRF) are compared for all footing configurations. To summarize, the test results showed that confiner along with reinforcement can be considered as an economic ground improvement technique for shallow foundations to counter against heavily inclined loading.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43426416","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

Case studies on Q-slope method use for slope stability analyses Q斜率法用于边坡稳定性分析的实例研究

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-07-27 DOI: 10.2478/sgem-2022-0010

E. Komurlu

{"title":"Case studies on Q-slope method use for slope stability analyses","authors":"E. Komurlu","doi":"10.2478/sgem-2022-0010","DOIUrl":"https://doi.org/10.2478/sgem-2022-0010","url":null,"abstract":"Abstract The use of the Q-slope value is a relatively new approach for the stability investigations of rock slopes. In this study, four different slopes in Giresun and Ordu cities of Turkey were investigated to assess whether the Q-slope approach is usable for varying slope heights, or not. A back analysis was carried out for a landslide in a case study quarry located in Kovanlik municipality of Giresun city. Carrying out detailed investigations on the geotechnical drill cores and the field studies, the Q-slope value of the rock mass of the Kovanlik quarry was determined as 0.58. According to the Q-slope approach, the slope which had a landslide under the case of 49° general slope angle and 225 m height should have been stable at a general slope angle of 59°. It has been found that the Q-slope approach is not favorable for a high slope with the height of 225 m. Two roadway excavations with steep slope angles and low heights smaller than 25 m were also investigated within this study. According to the Q-slope value, the roadway slopes which are stable for more than 3 years are estimated to be unstable. Therefore, the Q-slope approach was found also misleading for slopes with low heights like those under 25 m. On the other hand, the Q-slope method usability is confirmed obtaining parallel results with the observations from another case study slope with a height of 78 m. Although it has become a popular empirical method in the recent years, it is recommended to revise the Q-slope approach or limit its use depending on the slope height parameter.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49606837","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

Observation Method in the Control of Stacker Capacity Under Landslide Hazard – A Case Study 滑坡灾害下堆垛机承载力控制的观测方法——以滑坡灾害为例

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-07-27 DOI: 10.2478/sgem-2022-0013

Miłosz Bąk, I. Bagińska

引用次数: 1

Probabilistic Liquefaction Analysis Using Standard Penetration Test 基于标准穿透试验的概率液化分析

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-06-01 DOI: 10.2478/sgem-2022-0009

F. Kamel, S. Badreddine

{"title":"Probabilistic Liquefaction Analysis Using Standard Penetration Test","authors":"F. Kamel, S. Badreddine","doi":"10.2478/sgem-2022-0009","DOIUrl":"https://doi.org/10.2478/sgem-2022-0009","url":null,"abstract":"Abstract The Youd etal liquefaction resistance curves developed in 2001 to characterize the cyclic resistance of soil based on SPT test are the most used in the context of the Seed and Idriss simplified procedure as a deterministic model. These curves were developed from a modified database of Seed etal. in 1985 with the assumption that the actual peak shear stress (τd) induced at depth h is always less than that predicted by the simplified procedure (τr) of Seed and Idriss (rd= τd/τr<1). By using a suite of equivalent linear site response analyses to adjust the dynamic and the simplified shear stress at depth h, Filali and Sbartai showed in 2017 that the dynamic peak shear stress for some earthquakes is greater than the simplified peak shear stress (rd>1). As in this case, the assumption of the simplified procedure is not verified, Filali and Sbartai have proposed a corrector factor (RC) in the range where rd>1 to adjust the deformable and rigid body. In this paper, we will present a probabilistic study for the evaluation of the liquefaction potential using a database based on SPT measurement compiled after the Chi-Chi Taiwan earthquake, in which the cyclic stress ratio is evaluated using the proposed corrector factor. The objective of this study is to present a probabilistic shape of the cyclic resistance ratio (CRR) curves based on the original simplified method of Seed and Idriss and the corrected version and a new formulation for computing the probability of liquefaction.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44696032","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

Numerical Evaluation of Partially Strengthened Floating Granular Pile Raft With Vertical and Radial Displacement Compatibility 部分加固浮粒桩筏竖向与径向位移协调的数值评价

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-05-28 DOI: 10.2478/sgem-2022-0008

Raksha Rani Sanadhya, J. Sharma, Ashish Solanki

{"title":"Numerical Evaluation of Partially Strengthened Floating Granular Pile Raft With Vertical and Radial Displacement Compatibility","authors":"Raksha Rani Sanadhya, J. Sharma, Ashish Solanki","doi":"10.2478/sgem-2022-0008","DOIUrl":"https://doi.org/10.2478/sgem-2022-0008","url":null,"abstract":"Abstract In today’s time, construction is the main key for development of any nation, but land resources are getting deplete. Thus, construction on compressible soil is left as a choice. Stone columns or granular piles (GPs) are broadly used to advance the bearing capacity of crummy ground and lessen the displacement of constructionserected on them. GP is the most efficient and cheap for ground improvement. Analysis of single partially strengthened (SPS) floating granular piled raft is presented in this paper in terms of several normalized aspects like vertical and radial displacement impact factors, settlement impact factor (SIF) for any depth, the normalized GP–soil interface shear and radial stresses, the load ratio, i.e., the percentage of the load taken by the GP and raft to the total load, and the normalized contact pressure distribution below the raft, which are evaluated for SPS floating granular piled raft. The SIF for top of GP is noticed to decline with the surge in the values of the strengthening parameters. The interfacial shear stresses get reorganized along the length of the GP.","PeriodicalId":44626,"journal":{"name":"Studia Geotechnica et Mechanica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44091635","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

Excavations in the vicinity of the antiflood embankments – calculating issues 防汛堤防附近的开挖计算问题

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-04-26 DOI: 10.2478/sgem-2022-0006

M. Grodecki

引用次数: 0

Nonlinear buckling analysis of network arch bridges 网状拱桥非线性屈曲分析

IF 0.6

Studia Geotechnica et Mechanica Pub Date : 2022-04-26 DOI: 10.2478/sgem-2022-0007

Adrian Błonka, Łukasz Skrętkowicz

引用次数: 0