A Case Study of Efficient Solution for Very High Geogrid-Reinforced Retaining Wall

2017 ◽  
pp. 54-65
Author(s):  
Izzaldin M. Almohd ◽  
Dimiter Alexiew ◽  
Rami M. El-Sherbiny
Keyword(s):  
Efficient Solution ◽  
Retaining Wall ◽  
Reinforced Retaining Wall ◽  
Very High

Experiences from the High Geotextile Reinforced Retaining Wall – Case Study

2016 ◽  
Author(s):  
Ivan Vaníček ◽  
Martin Vaníček
Keyword(s):  
Retaining Wall ◽  
Limit States ◽  
Tensile Cracks ◽  
Know How ◽  
High Soil ◽  
Wall Construction ◽  
Reinforced Retaining Wall

Paper describes experiences obtained during the construction of high soil reinforced retaining wall. Such walls are now used during the foundation of large logistic and distribution centres on inclined terrain. First problems appeared roughly 2 years after the wall construction, when wide tensile cracks on the fill surface were observed behind the zone of reinforcement. First step of problem evaluation showed that this crack is connected to wall overturning. Therefore the reconstruction was recommended, upper part was removed and constructed under new evaluation of all relevant limit states and design situations. Phase of reconstruction was monitored and was used as an approval of the safe design. Experiences obtained during all described phases create an important know-how for next similar applications.

Safety and reliability of retaining wall: case study

Geotecnia ◽  
2016 ◽  
Vol 138 ◽  
pp. 37-60
Author(s):  
Rinaldo Garcia Ramirez ◽  
◽  
Jeselay Hemetério Cordeiro dos Reis ◽  
Keyword(s):  
Retaining Wall ◽  
Safety And Reliability

scholarly journals Influence of Hydrogeochemistry on Tunnel Drainage in Evaporitic Formations: El Regajal Tunnel Case Study (Aranjuez, Spain)

2021 ◽  
Vol 13 (3) ◽  
pp. 1505
Author(s):  
Ignacio Menéndez Pidal ◽  
Jose Antonio Mancebo Piqueras ◽  
Eugenio Sanz Pérez ◽  
Clemente Sáenz Sanz
Keyword(s):  
High Speed ◽  
Civil Engineering ◽  
Saturation Index ◽  
The Subject ◽  
Under Construction ◽  
Underground Flow ◽  
Very High ◽  
Over Time

Many of the large number of underground works constructed or under construction in recent years are in unfavorable terrains facing unusual situations and construction conditions. This is the case of the subject under study in this paper: a tunnel excavated in evaporitic rocks that experienced significant karstification problems very quickly over time. As a result of this situation, the causes that may underlie this rapid karstification are investigated and a novel methodology is presented in civil engineering where the use of saturation indices for the different mineral specimens present has been crucial. The drainage of the rock massif of El Regajal (Madrid-Toledo, Spain, in the Madrid-Valencia high-speed train line) was studied and permitted the in-situ study of the hydrogeochemical evolution of water flow in the Miocene evaporitic materials of the Tajo Basin as a full-scale testing laboratory, that are conforms as a whole, a single aquifer. The work provides a novel methodology based on the calculation of activities through the hydrogeochemical study of water samples in different piezometers, estimating the saturation index of different saline materials and the dissolution capacity of the brine, which is surprisingly very high despite the high electrical conductivity. The circulating brine appears unsaturated with respect to thenardite, mirabilite, epsomite, glauberite, and halite. The alteration of the underground flow and the consequent renewal of the water of the aquifer by the infiltration water of rain and irrigation is the cause of the hydrogeochemical imbalance and the modification of the characteristics of the massif. These modifications include very important loss of material by dissolution, altering the resistance of the terrain and the increase of the porosity. Simultaneously, different expansive and recrystallization processes that decrease the porosity of the massif were identified in the present work. The hydrogeochemical study allows the evolution of these phenomena to be followed over time, and this, in turn, may facilitate the implementation of preventive works in civil engineering.

scholarly journals A Raster-Based Subdividing Indicator to Map Urban Heat Vulnerability: A Case Study in Sydney, Australia

2018 ◽  
Vol 15 (11) ◽  
pp. 2516 ◽  
Author(s):  
Wei Zhang ◽  
Phil McManus ◽  
Elizabeth Duncan
Keyword(s):  
High Heat ◽  
The Past ◽  
Urban Heat ◽  
Research Gap ◽  
Heat Vulnerability ◽  
Very High ◽  
Flexible Model ◽  
General Indicator ◽  
Sydney Australia

Assessing and mapping urban heat vulnerability has developed significantly over the past decade. Many studies have mapped urban heat vulnerability with a census unit-based general indicator (CGI). However, this kind of indicator has many problems, such as inaccurate assessment results and lacking comparability among different studies. This paper seeks to address this research gap and proposes a raster-based subdividing indicator to map urban heat vulnerability. We created a raster-based subdividing indicator (RSI) to map urban heat vulnerability from 3 aspects: exposure, sensitivity and adaptive capacity. We applied and compared it with a raster-based general indicator (RGI) and a census unit-based general indicator (CGI) in Sydney, Australia. Spatial statistics and analysis were used to investigate the performance among those three indicators. The results indicate that: (1) compared with the RSI framework, 67.54% of very high heat vulnerability pixels were ignored in the RGI framework; and up to 83.63% of very high heat vulnerability pixels were ignored in the CGI framework; (2) Compared with the previous CGI framework, a RSI framework has many advantages. These include more accurate results, more flexible model structure, and higher comparability among different studies. This study recommends using a RSI framework to map urban heat vulnerability in the future.

scholarly journals REVISITING THE LIFE STYLE OF THE DON FOREST-STEPPE BELT POPULATION DURING THE SCYTHIAN PERIOD (THE CASE STUDY OF THE KSIZOVO-19 CEMETERY)

2021 ◽  
pp. 129-144
Author(s):  
И. К. Решетова ◽  
М. В. Добровольская ◽  
А. Н. Меркулов
Keyword(s):  
Physical Activity ◽  
Stress Level ◽  
Life Style ◽  
Forest Steppe ◽  
Pathological Conditions ◽  
Steppe Belt ◽  
Scythian Period ◽  
Very High

В статье рассмотрены палеоантропологические материалы грунтовых захоронений середины I тыс. до н. э., расположенных на территории Верхнего Дона. Находки получены в результате раскопок многослойного памятника Ксизово-19. Работы проводились Раннеславянской археологической экспедицией ИА РАН под руководством А. М. Обломского. Исследование антропологических коллекций проводилось по комплексной биоархеологической программе и позволило осветить ряд вопросов об образе жизни населения этой эпохи. Были проанализированы показатели уровня стрессов и физических нагрузок в рассматриваемой группе. Следует обратить внимание на очень высокий процент присутствия зубных патологий. При сравнении серий из грунтовых погребений и подкурганных захоронений выявлены различия в состоянии зубочелюстной системы и присутствие патологических состояний, фиксируемых на зубах в большей степени в группе из курганов. The paper provides an overview of paleoanthropological remnants from ground burials dating back to the mid I mill. BC located in the Upper Don region. The finds were obtained during excavations of the Ksizovo-19 multi-layer site. The excavations were carried out by the Early Slavic Expedition of the Institute of Archaeology, RAS, led by A. M. Oblomskiy. The study of the anthropological assemblages was performed according to a comprehensive bioarchaeological program. This makes it possible to cover a number of issues regarding the life style of the population at that time. The stress level and physical activity in the studied group were analyzed. A very high percentage of dental pathologies should be noted. Comparison of series from the ground burials and the kurgans burials revealed differences in the conditions of the dentofacial systems and presence of a greater number of pathological conditions of the teeth in the kurgan series.

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