Behavior of Bored Piles in Two Soil Layers, Sand Overlaying Compressible Clay (Case Study)

2017 ◽  
pp. 15-27
Author(s):  
Adel H. Hammam ◽  
A. E. Abdel Salam
Keyword(s):  
Soil Layers ◽  
Bored Piles

A case study on behaviors of composite soil nailed wall with bored piles in a deep excavation

2013 ◽  
Vol 20 (7) ◽  
pp. 2017-2024 ◽  
Author(s):  
Feng-bin Zhu ◽  
Lin-chang Miao ◽  
Huan-da Gu ◽  
Yue-hong Cheng
Keyword(s):  
Deep Excavation ◽  
Bored Piles

Effect of Saline Soils on Durability of Road between Alsamawa and Sawa Lake

2020 ◽  
Vol 857 ◽  
pp. 349-357
Author(s):  
Taha Yaseen Abdulnabi ◽  
Nidhal Hadi Salman ◽  
Ban Kasim
Keyword(s):  
Applied Stress ◽  
Saline Soils ◽  
Arid Zones ◽  
Test Results ◽  
Soil Layers ◽  
The Road ◽  
Swell Potential ◽  
Huge Challenge ◽  
Complete Collapse

Road specialists in the world often suffer the huge challenge in designing a stable road on very soft saline soils, these soils in arid zones have a low bearing capacity with high compressibility and very sensitive to moisture and synchronized with complete collapse. The case study concerned by the deterioration of main road linking between ‎Alsamawa town and Sawa lake approximately 20 km away from Alsamawa town. There are sections of roads affected by converges of nearby local artificial ‎lakes , water drawn from several good drain down to (80) meters depths and causing the deterioration in the road sections , swell-collapse test results represented by a little swell potential values were appeared for zero applied stress, while aggressive collapse were happened with increasing in applied stress, and the increasing in degree of collapsibility corresponding to increasing of applied stress of (50,100,200) KPa, and sodium chloride (NaCl%) in soil layers range between (0.613-16.468) % and slightly to moderately gypseous soils, the case study included several recommendations to treating the deteriorated significantly of road to protect the sub-grade and subbase layer .

scholarly journals Performance of a foundation pit supported by bored piles and steel struts: A case study

2018 ◽  
Vol 58 (4) ◽  
pp. 1016-1027 ◽  
Author(s):  
Xiaoyan Cui ◽  
Mingge Ye ◽  
Yan Zhuang
Keyword(s):  
Foundation Pit ◽  
Bored Piles

scholarly journals Improving pre-drilling efficiency by analysing geological prospecting data: a case study of a project in Nanshan, Shenzhen

2020 ◽  
Vol 165 ◽  
pp. 03047
Author(s):  
Da Liu ◽  
Zheng Liu ◽  
Tianyu Chen
Keyword(s):  
Pile Foundation ◽  
Design Stage ◽  
Geological Condition ◽  
Optimal Length ◽  
Bored Pile ◽  
Bored Piles ◽  
The Cost ◽  
Rock Strata ◽  
Pile Length

Pre-drilling is a widely used technique to get the detailed geological condition at the location of the bored pile foundation prior to its construction. It is often a necessary step for bored piles supported by strata, as its results are helpful for finalizing the pile length in design stage, which often requires the pile to be embedded into the rock strata at certain depth. The aim of the paper is to find the optimal (normally the lowest) point of rock strata at the purposed pile location, so that the optimal length required for the pile can be determined. To achieve this, geological prospecting data of the site needs to be analysed and the optimal pre-drilling point needs to be determined. The model developed by this study is based on the geological prospecting data and the pre-drilling results of a real project with a sharp slope of strata. It is found that by using the method introduced in this study, higher accuracy results could be obtained with less pre-drilling works required, hence the time and the cost of pre-drilling can be greatly reduced.

A Study of the Prediction of Load-Settlement Curves of Bored Piles with an Improved Grey Model

2013 ◽  
Vol 671-674 ◽  
pp. 3-9 ◽  
Author(s):  
Cheng Hua Wang ◽  
Mei Na Zhang
Keyword(s):  
Theory Model ◽  
Grey Model ◽  
System Model ◽  
Engineering Practice ◽  
Grey Theory ◽  
Grey System ◽  
Loading Tests ◽  
Bored Piles ◽  
Grey System Model

An improved grey system model GM(1,1) was proposed in this paper, considered that the large difference between predicted results and measured load-settlement relationship results of bored piles, in which the prediction results were given by the original theory. The complete and incomplete load-settlement curves from pile loading tests were fitted and predicated by the improved grey model. The results calculated with empirical equations or methods in technical code for building pile foundations were compared with those predicted with the improved grey model. Analysis of a case study showed that the results predicted by the improved grey theory model GM(1,1) had higher precision, which demostrated that this improved theory was of significance in engineering practice.

scholarly journals Modelling the spatiotemporal complexity of interactions between pathogenic bacteria and a phage with a temperature-dependent life cycle switch

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Halil I. Egilmez ◽  
Andrew Yu. Morozov ◽  
Edouard E. Galyov
Keyword(s):  
Burkholderia Pseudomallei ◽  
Pathogenic Bacteria ◽  
Reaction Diffusion ◽  
External Forcing ◽  
Natural Control ◽  
Temperature Dependent ◽  
Highly Pathogenic ◽  
Soil Layers ◽  
Spatial Aspect

AbstractWe apply mathematical modelling to explore bacteria-phage interaction mediated by condition-dependent lysogeny, where the type of the phage infection cycle (lytic or lysogenic) is determined by the ambient temperature. In a natural environment, daily and seasonal variations of the temperature cause a frequent switch between the two infection scenarios, making the bacteria-phage interaction with condition-dependent lysogeny highly complex. As a case study, we explore the natural control of the pathogenic bacteria Burkholderia pseudomallei by its dominant phage. B. pseudomallei is the causative agent of melioidosis, which is among the most fatal diseases in Southeast Asia and across the world. We assess the spatial aspect of B. pseudomallei-phage interactions in soil, which has been so far overlooked in the literature, using the reaction-diffusion PDE-based framework with external forcing through daily and seasonal parameter variation. Through extensive computer simulations for realistic biological parameters, we obtain results suggesting that phages may regulate B. pseudomallei numbers across seasons in endemic areas, and that the abundance of highly pathogenic phage-free bacteria shows a clear annual cycle. The model predicts particularly dangerous soil layers characterised by high pathogen densities. Our findings can potentially help refine melioidosis prevention and monitoring practices.

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