scholarly journals A Case Study of Combined Drainage Consolidation-Preloading Methods for a Highway Subgrade on Peat Soils

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Yue Gui ◽  
Shengjun Liu ◽  
Xiaqiang Qin ◽  
Jianfei Wang
Keyword(s):  
Ground Improvement ◽  
Sri Lankan ◽  
Peat Soils ◽  
Prefabricated Vertical Drains ◽  
Vertical Drains ◽  
Consolidation Coefficient ◽  
Gravel Pile ◽  
Insight Into

A highway project of up to 100 km/h is currently being constructed between Colombo and Katunayake International Airport across a Sri Lankan muskeg area. At this site, peat deposit was initially 0.8∼15.3 m thick and was underlain by sand, clay, or gneiss. The ground improvement methods adopted in the project were combined drainage consolidation-preloading methods, pipe pile foundation, and geogrids. This paper provides a detailed insight into the implementation of combined drainage consolidation-preloading methods used in the project, including sand pile, gravel pile, and plastic drainage plate as the prefabricated vertical drains. Periodical field-level observations were taken during the ten years, including the construction and postconstruction periods. The results show that peat soils’ consolidation coefficient has been increased several times to tens of times due to ground improvement. After removing the temporary surcharge, the highway embankments did not heave and was followed by long-term settlements totaling 1.3∼7.4 cm over the following seven years of observations. Analysis of the settlement records shows that combined drainage consolidation-preloading methods have helped accelerate drainage consolidation and reduce postconstruction settlement.

Consolidation in Soft Soil – Case Study on Prefabricated Vertical Drains (PVDs)

2021 ◽  
Vol 15 (1) ◽  
pp. 310-319
Author(s):  
Nadarasa Kuganeswaran ◽  
Afikah Rahim ◽  
Nazri Ali
Keyword(s):  
Ground Improvement ◽  
Soft Soil ◽  
3D Analysis ◽  
Prefabricated Vertical Drains ◽  
Vertical Drains ◽  
Vertical Drain ◽  
Prefabricated Vertical Drain ◽  
Improvement Method ◽  
Plaxis 3D

Background: Constructing on soft ground is one of the challenges of geotechnical engineering. The unpredictable behaviour and characteristics of soft soil can cause much damage resulting in high maintenance costs in the post-construction phase. Objective: The purpose of this study is to analyse the consolidation process and ground improvement method using surcharge and a prefabricated vertical drain by measuring the accuracy of the prediction settlement value with the actual site settlement results. Methods: An effective ground improvement method is the application of a surcharge and prefabricated vertical drains (PVDs). Various methods can be used to predict the settlement effectively, one such method being PLAXIS 3D simulation. A case study on ground improvement works was selected for this research, where PVDs were constructed and implemented at the site. A few undisturbed samples were collected from the site to generate the parameters based on the lab test conducted in the simulation process. This parameter was carefully studied and representing the principal input for the 3D model, which is generated and represents the actual ground improvement method for the selected case study. The analysis was performed using a borehole and soft soil model to generate the diagram. The prediction settlement value was generated from the PLAXIS 3D analysis as the baseline comparing to the actual results. The factors that influence the settlement value, such as the length and spacing of the prefabricated vertical drain, construction method, and soil characteristics, are also discussed. Results: A predicted settlement of 2553 mm was generated by the simulation, while the actual settlement outcome at the site was 2096 mm, a difference of 457 mm, and a prediction accuracy of 82.1%. Conclusion: The study found that the combination of surcharge and prefabricated vertical drain in the ground improvement worked well. Also, discussed were the factors that influenced the accuracy of the prediction and the site results.

Analysis of Manpower Capability Needs in Business Process Outsourcing (BPO) for Tobacco Industry: A Case study on BPO industry in Clark Pampanga, Philippines.

2021 ◽  
Vol 7 (5) ◽  
pp. 2916-2923
Author(s):  
Feng Shuo ◽  
Qi Yao ◽  
Gualberto A. Magdaraog
Keyword(s):  
Human Resources ◽  
Business Process ◽  
Tobacco Industry ◽  
Research Study ◽  
Business Process Outsourcing ◽  
Qualitative Research Study ◽  
Quantitative And Qualitative Research ◽  
Insight Into

Objectives: The study focus on the capability needs of Business Process Outsourcing (BPO) employees for tobacco industry.The study is a quantitative and qualitative research study. It used a survey questionnaire to gather data needed for analysis. The respondents of the study were 50 employees of BPO companies in Clark Pampanga Philippines,where BPO industry is a trend. The findings show an up-to-date picture of BPO industries in Clark Pampanga and an insight into BPO human resources capabilities needs for tobacco industry. It may let Tobacco companies analyze own employee management system with increased precision. They still enabled us to define employment perspective and the challenges tobacco companies are facing, to identify the current BPO human resources capability issues and the long-term human resources trends for Tobacco industry. Together, they provide an exact depiction for the Tobacco industry and valuable foresights to both its employees and employers.

Vacuum preloading consolidation of reclaimed land: a case study

1998 ◽  
Vol 35 (5) ◽  
pp. 740-749 ◽  
Author(s):  
J Q Shang ◽  
M Tang ◽  
Z Miao
Keyword(s):  
Land Reclamation ◽  
Soil Improvement ◽  
Large Area ◽  
Vacuum Preloading ◽  
Reclaimed Land ◽  
Improvement Project ◽  
Prefabricated Vertical Drains ◽  
Vertical Drains ◽  
Soft Clays

This case study presents the design, operation, and results of a soil improvement project using the vacuum preloading method on 480 000 m2 of reclaimed land in Xingang Port, Tianjing, China. The areas treated with vacuum ranged from 5000 to 30 000 m2. The effects of soil improvement are demonstrated through the average consolidation settlement of 2.0 m and increases in undrained shear strengths by a factor of two to four or more. The study shows that the vacuum method is an effective tool for the consolidation of very soft, highly compressive clayey soils over a large area. The technique is especially feasible in cases where there is a lack of surcharge loading fills, extremely low shear strength, soft ground adjacent to critical slopes, and access to a power supply.Key words: vacuum preloading consolidation, soil improvement, soft clays, land reclamation, prefabricated vertical drains.

scholarly journals Effect of Improvement and Application of Composite Prefabricated Vertical Drain Method in Marine Soft Ground: A Case Study

2019 ◽  
Vol 2019 ◽  
pp. 1-18 ◽  
Author(s):  
Jianqing Jiang ◽  
Reqiang Liu
Keyword(s):  
High Speed ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Ground Improvement ◽  
Field Monitoring ◽  
Hyperbolic Model ◽  
Soft Ground ◽  
Prefabricated Vertical Drains ◽  
Prefabricated Vertical Drain

One of the commonly used techniques to improve marine soft ground is the drainage consolidation method by plastic board drains (PBDs). But some complex marine soft ground will cause construction inconvenience of PBDs in certain areas of these sites, thus affecting the improvement effect. An alternative possible approach to overcoming these deficiencies may be the combination of PBDs and sand wick drains (SWDs) (i.e., composite prefabricated vertical drains (CPVDs)) as vertical drainage channels in the same site. In order to verify the suitability and performance of this method in marine soft ground improvement, a case study was performed based on the field monitoring and construction of the marine soft ground of an intercity express railway project in China. The construction procedure using the CPVD system, the field monitoring instrumentation scheme, and the design of fill surcharge level were described, and the field monitoring data were presented. The settlement characteristics, dissipation features of pore water pressure, and the horizontal movement pattern were assessed. In addition, predictions of ultimate settlement, postconstruction settlement, and consolidation degree were discussed by applying a modified hyperbolic model. The results show that the marine ground improved by the CPVD system is suitable for the construction of intercity express railway and high-speed railway. The improvement construction period of complex marine soft ground will be greatly shortened by the proposed parallel construction programme. This work will provide technical supports and application reference for the improvement of the similar marine soft ground.

scholarly journals Other Types of Meaning: Relationships between Round Barrows and Landscapes from 1500 bc–ac 1086

2016 ◽  
Vol 26 (4) ◽  
pp. 665-696 ◽  
Author(s):  
Anwen Cooper
Keyword(s):  
Bronze Age ◽  
Extended Time ◽  
Generic Group ◽  
Time Period ◽  
Human Practices ◽  
Fresh Insight ◽  
Insight Into ◽  
Extended Time Period

This paper is about Bronze Age round barrows and the ways in which they became caught up in human practices over an extended time period. At one level it belongs to a flourishing body of work that examines the ‘re-use’ or ‘biography’ of prehistoric monuments. Rather than treating the latter as a generic group, however, this study focuses on chronologies of one specific monument type—round barrows—over a 2600-year period from 1500 bc–ac 1086. By bringing together evidence and interpretations generated mainly within period specialisms, significant homogeneities are revealed in terms of how activities at prehistoric monuments have previously been understood. The possibilities for seeking out different interpretative ground are duly explored. Using a case study from the east of England and drawing on evidence and ideas from much more broadly, the approach taken places particular emphasis on examining relationships between round barrows and other aspects of landscape. The findings offer fresh insight into the temporality of activities undertaken at round barrows, question existing characterizations of past people's historical understandings, and explore the long-term coherence of ‘round barrows’ as a category.

Sign in / Sign up

Export Citation Format

Share Document