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.

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.

scholarly journals The model and simulation of low impact development of the sponge airport, China

2019 ◽  
Vol 20 (2) ◽  
pp. 383-394 ◽  
Author(s):  
Jing Peng ◽  
Jiayi Ouyang ◽  
Lei Yu ◽  
Xinchen Wu
Keyword(s):  
Flood Control ◽  
Low Impact Development ◽  
Water Environment ◽  
Drainage System ◽  
Practical Significance ◽  
International Airport ◽  
Model And Simulation ◽  
Impervious Area ◽  
Before And After ◽  
Airport Runway

Abstract Recently urban waterlogging problems have become more and more serious, and the construction of an airport runway makes the impervious area of the airport high, which leads to the deterioration of the water environment and frequent waterlogging disasters. It is of great significance to design and construct the sponge airport with low impact development (LID) facilities. In this paper, we take catchment N1 of Beijing Daxing International Airport as a case study. The LID facilities are designed and the runoff process of a heavy rainfall in catchment N1 is simulated before and after the implementation of LID facilities. The results show that the total amount of surface runoff, the number of overflow junctions and full-flow conduits of the rainwater drainage system in catchment N1 of Beijing Daxing International Airport are significantly reduced after the implementation of the LID facilities. Therefore, the application of LID facilities has greatly improved the ability of the airport to remove rainwater and effectively alleviated the risk of waterlogging in the airport flight area. This study provides theoretical support for airport designers and managers to solve flood control and rainwater drainage problems and has vital practical significance.

scholarly journals Toxicity assessment of pickling liquors containing TiF₃, HF and HCl before and after neutralization using a phytotesting method

2017 ◽  
Vol 6 (2) ◽  
pp. 24-27
Author(s):  
Nikolay Alekseevich Bykovsky ◽  
Timur Zulfukarovich Zabirov ◽  
Inna Vyacheslavovna Ovsyannikova ◽  
Lyudmila Nikolaevna Puchkova ◽  
Nadezhda Nikolaevna Fanakova
Keyword(s):  
Dilution Rate ◽  
Average Length ◽  
Ground Surface ◽  
Dry Weight ◽  
Sewage Water ◽  
Toxicity Assessment ◽  
Rate Equations ◽  
Lepidium Sativum ◽  
Before And After ◽  
Acute Toxic Effect

The paper evaluates the toxicity of spent acid pickling liquor (SAPL) formed in the production of titanium products during its etching with a mixture of hydrofluoric and hydrochloric acids. The SAPL contained TiF₃, HF and HCl in the amounts of 21,9 g/l, 1,7 g/l and 6,2 g/l, respectively. To determine the toxicity of SAPL, a phytotesting method was used. As a phytoecological indicator, cress of Zabava variety was used. The experiment was carried out according to the procedure for determining the toxicity of drinking, ground, surface and sewage water; the toxicity of chemical solutions by measuring the germination index, average length and average dry weight of seed germs of cress (Lepidium sativum). The toxicity of the SAPL was determined before and after neutralizing with alkali. It has been shown that SAPL has an acute toxic effect both before and after its neutralization by alkali. To determine a safe dilution rate, the influence of SAPL dilution on seed germination, average length and average dry weight of the seedlings was studied. It was found that the seedlings average length-dilution rate equations most reliably describe the experimental findings. The safe dilution rate calculated from these relations is 669,2 for non-neutralized SAPL and 382,5 for alkaline neutralized SAPL.

scholarly journals Liquefaction Susceptibility of an Earth Dam Foundation: A Case Study 

2021 ◽  
Author(s):  
Hatem karoui ◽  
Mounir Bouassida
Keyword(s):  
Ground Surface ◽  
Standard Penetration Test ◽  
Earth Dam ◽  
Sand Layer ◽  
Dam Foundation ◽  
Liquefaction Susceptibility ◽  
Numerical Predictions ◽  
Earth Embankment ◽  
Heterogeneous Foundation

Abstract Sidi El Barrak earth dam is a compacted earth embankment of height 28 m built in 1999 on a heterogeneous foundation with strong dominance of sandy formations. The dam foundation was subjected to several tests to predict its behavior against the liquefaction risk. Standard penetration test (SPT) results served to evaluate the liquefaction risk in an earthquake occurrence. This article, firstly, presents an interpretation of data collected from SPT tests. Determination of liquefaction risk resulted from the empirical methods proposed by Seed & Idriss, (1985) and Idriss & Boulanger, (2008). Obtained results by those methods showed that, for different earthquake magnitudes equal to 5.25, 6 and 6.75, the risk of liquefaction exists in the pure sand layer located between the ground surface and 15 m depth of the foundation of the earth dam. An UBC3D-PLM constitutive model was adopted for studying the numerical response of sand layer subjected to an earthquake of acceleration equal 0.2 g to estimate its liquefaction risk. Recorded SPT data and laboratory tests results served for the determination of geotechnical parameters of this model. From numerical predictions it revealed that the liquefaction risk is greater for an earthquake characterized by an acceleration equal 0.2g.

scholarly journals Forensic investigation of Gumbasa irrigation main canal damage due to large-scale flow liquefaction in Sibalaya caused by the 2018 Sulawesi Earthquake

2021 ◽  
Vol 930 (1) ◽  
pp. 012079
Author(s):  
S Nurdin ◽  
A Arsyad ◽  
F A Marhum ◽  
H Setiawan
Keyword(s):  
Large Scale ◽  
Field Tests ◽  
Standard Penetration Test ◽  
Forensic Investigation ◽  
Flexible Pipe ◽  
Ground Movements ◽  
Before And After ◽  
Future Earthquake ◽  
Main Canal ◽  
Flow Liquefaction

Abstract This study conducted an extensive soil investigation in the Sibalaya liquefaction area to identify the Gumbasa main canal’s damage triggered by flow liquefaction. Several field tests and trenches with approximately 4 m were excavated to observe liquefied soil layers directly near the canal. A borehole, standard penetration test, and multichannel analysis surface waves (MASW) were performed beside the trench to obtain each layer’s penetration resistance. This research aims to understand the landslide’s whole aspect. The ground movements were analyzed by using satellite photos before and after the earthquake. The displacement of the main canal, the typical damage inventory, and the proposed reconstruction of the main canal are the focus of this study. As a result of the forensic investigation, the liquefied layers and debris flow contributing to the massive landslide were identified to impact the primary canal. The typical damage of the canal was due to surface rupture that occurred both horizontally and vertically. A solution for reconstructing the main canal is to use a flexible pipe canal structure. That will be resilient to future earthquake and ground movements, stabilize the ground downslope of the existing canal to limit the risk of future lateral movement in future earth tremors.

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.

Study on Vibro-Replacement Stone Pile Test for Soft Soil Foundation

2014 ◽  
Vol 543-547 ◽  
pp. 3982-3985
Author(s):  
Tie Liang Li ◽  
Jing Meng ◽  
Qiang Zhang ◽  
Gan Zhang ◽  
Lei Fei Deng ◽  
...  
Keyword(s):  
Soft Soil ◽  
Standard Penetration Test ◽  
Reinforcement Effect ◽  
Feeding Mode ◽  
The Earth ◽  
Feeding Type ◽  
Before And After ◽  
Undrained Strength ◽  
Soil Foundation ◽  
Soft Soil Foundation

This paper studies the applicability of vibro-replacement stone pile in combination of a port project in Dalian as well as heavy dynamic sounding and standard penetration test, studies the reinforcement effect of pile distance and feeding type on vibro-replacement stone and analyzes reinforcement effects of the side pile and the earth among piles. The results show: smaller pile distance will bring better pile compactness; for the vibro-replacement stone pile constructed in soft earth with undrained strength less than 20kPa with the conventional method, it is not easy to form compact pile; the reinforcement effect works only within 0.6m on the top; vibro-replacement stone pile with bottom feeding mode can form compact piles, but the pile has the interlayer which is not compact enough partially; the strength of the earth among piles fails to improve obviously before and after the stone pile is formed.

Earthquake Response of Underground Pipeline Networks in Christchurch, NZ

2014 ◽  
Vol 30 (1) ◽  
pp. 183-204 ◽  
Author(s):  
Thomas D. O'Rourke ◽  
Sang-Soo Jeon ◽  
Selcuk Toprak ◽  
Misko Cubrinovski ◽  
Matthew Hughes ◽  
...  
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
Ground Surface ◽  
Lessons Learned ◽  
Peak Ground Velocity ◽  
Underground Pipeline ◽  
Gas Distribution ◽  
Pipeline Networks ◽  
Before And After ◽  
Ground Surface Settlement

This paper explores key aspects of underground pipeline network response to the Canterbury earthquake sequence in Christchurch, New Zealand, including the response of the water and wastewater distribution systems to the MW6.2 22 February 2011 and MW6.0 13 June 2011 earthquakes, and the response of the gas distribution system to the MW7.1 4 September 2010 earthquake, as well as the 22 February and 13 June events. Repair rates, expressed as repairs/km, for different types of pipelines are evaluated relative to (1) the spatial distribution of peak ground velocity outside liquefaction areas and (2) the differential ground surface settlement and lateral ground strain within areas affected by liquefaction, calculated from high-resolution LiDAR survey data acquired before and after each main seismic event. The excellent performance of the gas distribution network is the result of highly ductile polyethylene pipelines. Lessons learned regarding the earthquake performance of underground lifeline systems are summarized.

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