scholarly journals Dynamic Compaction of Sandy Soils in Kuwait – A Case Study

2021 ◽  
Author(s):  
By Nabil F. Ismael ◽  
◽  
Monera Al-Otaibi ◽  
Keyword(s):  
Ground Improvement ◽  
Ground Level ◽  
Shallow Foundation ◽  
Dynamic Compaction ◽  
Soil Pressure ◽  
Foundation Design ◽  
Economic Method ◽  
Before And After ◽  
New City ◽  
Penetration Tests

Ground improvement was required for construction of the Jaber Al Ahmed New City located about 25 km west of Kuwait City, Kuwait. Loose to medium poorly graded sands, and silty sands extended from ground level to a depth ranging from 5m to 9m. Dynamic compaction was employed, as an economic method, to increase the soil bearing capacity and reduce its compressibility for foundation design and construction. The testing program included borings and sampling, Standard Penetration Tests, Cone Penetration Tests and Pressuremeter Tests before and after dynamic compaction. The area covered in this study is about 31415m2. The results indicated significant ground improvement, and satisfaction of the specified acceptance criteria resulting in an allowable soil pressure, for shallow foundation design, equal to or exceeding 300 kN/m2.

Liquefaction performance of soils at the site of a partially completed ground improvement project during the 1999 Chi-Chi earthquake in Taiwan

2001 ◽  
Vol 38 (6) ◽  
pp. 1241-1253 ◽  
Author(s):  
Der-Her Lee ◽  
C Hsein Juang ◽  
Chi-Sheng Ku
Keyword(s):  
Ground Improvement ◽  
Construction Site ◽  
Cone Penetration ◽  
In Situ Tests ◽  
Improvement Project ◽  
Cone Penetration Tests ◽  
Hydraulic Filling ◽  
Before And After ◽  
Penetration Tests

This paper examines the liquefaction performance of soils at the site of a partially completed ground improvement project at the Chang-Hwa Coastal Industrial Park during the 1999 Chi-Chi earthquake in Taiwan. The site is on land reclaimed by hydraulic filling. To meet the need of a planned construction, site characterization was carried out with standard penetration tests (SPTs) and cone penetration tests (CPTs) at 13 locations. Dynamic compaction was later performed to mitigate the potential liquefaction hazards at this site. Before completion of the ground improvement work, the site experienced a major earthquake, the Chi-Chi earthquake (magnitude Mw = 7.6). Evidence of liquefaction was observed in this earthquake in the unimproved area but not in the improved area. After the earthquake, additional site exploration was carried out using SPTs and CPTs. The data from these in situ tests carried out before and after the earthquake and in areas with and without ground improvement are analyzed and the results are reported.Key words: ground improvement, in situ tests, liquefaction, earthquake.

scholarly journals Thematic Maps for the Variation of Bearing Capacity of Soil Using SPTs and MATLAB

Geosciences ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 329
Author(s):  
Mahdi O. Karkush ◽  
Mahmood D. Ahmed ◽  
Ammar Abdul-Hassan Sheikha ◽  
Ayad Al-Rumaithi
Keyword(s):  
Bearing Capacity ◽  
Mean Squared Error ◽  
Ground Level ◽  
The Other ◽  
Thematic Maps ◽  
First Order ◽  
Squared Error ◽  
Order Polynomial ◽  
Interpolation Polynomials ◽  
Penetration Tests

The current study involves placing 135 boreholes drilled to a depth of 10 m below the existing ground level. Three standard penetration tests (SPT) are performed at depths of 1.5, 6, and 9.5 m for each borehole. To produce thematic maps with coordinates and depths for the bearing capacity variation of the soil, a numerical analysis was conducted using MATLAB software. Despite several-order interpolation polynomials being used to estimate the bearing capacity of soil, the first-order polynomial was the best among the other trials due to its simplicity and fast calculations. Additionally, the root mean squared error (RMSE) was almost the same for the all of the tried models. The results of the study can be summarized by the production of thematic maps showing the variation of the bearing capacity of the soil over the whole area of Al-Basrah city correlated with several depths. The bearing capacity of soil obtained from the suggested first-order polynomial matches well with those calculated from the results of SPTs with a deviation of ±30% at a 95% confidence interval.

Deep Dynamic Compaction: Practical and Cost-Effective Ground Improvement at the Port of Long Beach

Ports 2013 ◽  
2013 ◽  
Author(s):  
Mariusz P. Sieradzki ◽  
Bartlett W. Patton ◽  
Douglas J. Sereno ◽  
Paul Wehrlen
Keyword(s):  
Ground Improvement ◽  
Cost Effective ◽  
Dynamic Compaction ◽  
Long Beach

scholarly journals Evaluasi Perbaikan Tanah Menggunakan Rapid Impact Compaction pada Tanah Berpotensi Likuefaksi

2020 ◽  
Vol 4 (2) ◽  
pp. 82-92
Author(s):  
Desti Santi Pratiwi
Keyword(s):  
Ground Improvement ◽  
Ground Surface ◽  
Soil Condition ◽  
Standard Penetration Test ◽  
Soil Material ◽  
International Airport ◽  
Before And After ◽  
Project Site ◽  
Rapid Impact Compaction ◽  
Problematic Soil

ABSTRAKRapid Impact Compaction (RIC) merupakan salah satu metode perbaikan tanah secara mekanik untuk tanah granular. Prinsip dasar dari Rapid Impact Compaction yaitu menjatuhkan beban hammer dengan tinggi jatuh yang relatif rendah dengan kecepatan yang tinggi. RIC dapat dijadikan alternatif dalam mitigasi likuefaksi. Beberapa penelitian sebelumnya menyatakan bahwa RIC dapat memperbaiki tanah hingga kedalaman 6 m. Pada penelitian ini, evaluasi efektifitas perbaikan tanah menggunakan RIC dilakukan di lokasi Pembangunan New Yogyakarta International Airport Kulon Progo. Pada lokasi tersebut terdapat tanah pasir lepas dan berpotensi likuefaksi hingga kedalaman 8m. Analisis yang dilakukan yaitu membandingkan nilai Standard Penetration Test (SPT) sebelum dan setelah perbaikan tanah dengan RIC. Hasil analisis menunjukkan bahwa terdapat kenaikan nilai SPT sebesar 10 – 12, sehingga dapat memehuni kriteria desain yang telah ditentukan untuk mitigasi likuefaksi.Kata kunci: perbaikan tanah, likuefaksi, Rapid Impact Compaction, SPT. ABSTRACTRapid Impact Compaction (RIC) is one of mechanical ground improvement technique that suitable for granular soil material. The principle of this method is repeatedly strike an impact plate on the ground surface using a hydraulic hammer. RIC can be implemented as an alternative for liquefaction mitigation. Some previous studies have stated that RIC can improve the soil to a depth of 6 m. The evaluation of effectiveness RIC to improving problematic soil was taken in New Yogyakarta International Airport project. At the project site, the soil condition is consist of loose sand and potential to be liquefied up to 8 m depth. The analysis has donne by comparing the SPT value before and after improving by RIC. The result of analysis gave an information that there is an increace SPT value of 10 – 12, so it can meet with the design criteria for mitigation of liquefaction.Keywords: ground improvement, liquifaction, Rapid Impact Compaction, SPT.

Civic Cults between Continuity and Change

2018 ◽  
Author(s):  
Ryan Boehm
Keyword(s):  
Religious Community ◽  
Social Response ◽  
Focal Points ◽  
Sacred Landscape ◽  
Religious Identities ◽  
Continuity And Change ◽  
Before And After ◽  
New City ◽  
Religious Landscape

This chapter considers the important role of the polis as a religious community. Reconstructing cultic continuities and changes reveals aspects of social response to the rupture and discontinuity posed by population movement, settlement shift, and political change. The epigraphic, literary, and archaeological evidence allows us to piece together important indications of how traditional cultic and religious identities intersected with innovation. The chapter first maps the changing religious landscape of regions before and after urban mergers and considers how and why particular cults survived or died out and what this meant for the community that resulted. It then shows the ways in which central sanctuaries and civic cults served as focal points for integrating the discrete citizen groups into the polis, and the ways in which the traditional sacred landscape was simultaneously respected and replicated in the center of the new city. Finally, it examines the ways in which these synoikized communities—and, at times, their original constitutive parts—participated in religious and theoric networks such as koina and Panhellenic festivals.

scholarly journals Numerical Study of the Dynamic Compaction Process considering the Phenomenon of Particle Breakage

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Xi Li ◽  
Jing Li ◽  
Xinyan Ma ◽  
Jidong Teng ◽  
Sheng Zhang
Keyword(s):  
Numerical Study ◽  
High Energy ◽  
Particle Breakage ◽  
Dynamic Compaction ◽  
Coarse Grained ◽  
Impact Stress ◽  
Logarithmic Curve ◽  
Before And After ◽  
Soil Foundation ◽  
Overlapping Method

Dynamic compaction (DC) is commonly used to strengthen the coarse grained soil foundation, where particle breakage of coarse soils is unavoidable under high-energy impacts. In this paper, a novel method of modeling DC progress was developed, which can realize particle breakage by impact stress. A particle failure criterion of critical stress is first employed. The “population balance” between particles before and after crushing is guaranteed by the overlapping method. The performance of the DC model is successfully validated against literature data. A series of DC tests were then carried out. The effect of particle breakage on key parameters of DC including crater depth and impact stress was discussed. Besides, it is observed that the relationship between breakage amount and tamping times can be expressed by a logarithmic curve. The present method will contribute to a better understanding of DC and benefit further research on the macro-micro mechanism of DC.

Mitigation of liquefaction hazard by dynamic compaction — a random field perspective

2019 ◽  
Vol 56 (12) ◽  
pp. 1803-1815 ◽  
Author(s):  
Mengfen Shen ◽  
C. Hsein Juang ◽  
Qiushi Chen
Keyword(s):  
Random Field ◽  
Dynamic Compaction ◽  
Loose Sand ◽  
In Situ Test ◽  
Liquefaction Hazard ◽  
Before And After ◽  
Project Site ◽  
Field Perspective

This paper presents the findings of a case study to quantitatively assess the effect of dynamic compaction (DC) on mitigating liquefaction hazards from a random field perspective. DC is known to increase the density and strength of loose sand deposits, leading to a decrease in liquefaction potentials. Thus, by comparing the liquefaction potentials before and after DC at a given site, the effectiveness of DC in mitigating liquefaction hazards can be quantified. In practice, however, a direct one-to-one comparison is challenging due to limited availability of in situ test data and the fact that the number and location of these data before and after DC are typically different. To overcome these challenges, a random field-based approach is proposed in this study to visualize and quantitatively evaluate the effectiveness of DC across the entire project site. This approach is proven effective in assessing the effects of DC and is validated with liquefaction observations from the 1999 Chi-Chi earthquake.

Liquefaction Mitigation Using Stone Columns Around Deep Foundations: Full-Scale Test Results

2000 ◽  
Vol 1736 (1) ◽  
pp. 110-118 ◽  
Author(s):  
Scott A. Ashford ◽  
Kyle M. Rollins ◽  
S. Case Bradford V ◽  
Thomas J. Weaver ◽  
Juan I. Baez
Keyword(s):  
Pore Pressure ◽  
Ground Improvement ◽  
Full Scale ◽  
Stone Columns ◽  
Excess Pore Pressure ◽  
Deep Foundations ◽  
Laterally Loaded Piles ◽  
Before And After ◽  
Laterally Loaded ◽  
Excess Pore

The results presented were developed as part of a larger project analyzing the behavior of full-scale laterally loaded piles in liquefied soil, the first full-scale testing of its kind. Presented here are the results of a series of full-scale tests performed on deep foundations in liquefiable sand, both before and after ground improvement, in which controlled blasting was used to liquefy the soil surrounding the foundations. Data were collected showing the behavior of laterally loaded piles before and after liquefaction. After the installation of stone columns, the tests were repeated. From the results of these tests, it can be concluded that the installation of stone columns can significantly increase the density of the improved ground as indicated by the cone penetration test. Furthermore, it was found that the stone column installation limited the excess pore pressure increase from the controlled blasting and substantially increased the rate of excess pore pressure dissipation. Finally, the stone columns were found to significantly increase the stiffness of the foundation system by more than 2.5 to 3.5 times that in the liquefied soil. This study provides some of the first full-scale quantitative results on the improvement of foundation performance due to stone columns in a liquefiable deposit.

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