Sand Soil Properties as the Sea Embankment Material Used in Pipe-Bag Riding Method

2012 ◽  
Vol 488-489 ◽  
pp. 1071-1075
Author(s):  
Xuan Zhang ◽  
Liang De He ◽  
Ning Zhuang
Keyword(s):  
Stability Analysis ◽  
Laboratory Tests ◽  
Grain Shape ◽  
Construction Material ◽  
Sand Soil ◽  
Liquefaction Potential ◽  
Shape Coefficient ◽  
Embankment Slope ◽  
Coefficient Of Permeability ◽  
The Stability

Comparing with the stability demands of construction material used in pipe-bag riding technology for sea embankments, and based on many site and laboratory tests of sand distributed in Dongtai offshore, Northern Jiangsu Province in China for reclamation engineering, the type of sand, mechanical composition, grain shape, coefficient of permeability and liquefaction potential of sands were discussed. Additionally, the sea embankment slope stability analysis and seepage stability analysis demonstrate the sands can be used in sea embankment construction for pipe bag method

Forensic Analyses and Rehabilitation of a Failed Highway Embankment Slope in Texas

2021 ◽  
pp. 036119812199635
Author(s):  
Burak Boluk ◽  
Anand J. Puppala ◽  
Sayantan Chakraborty ◽  
Puneet Bhaskar
Keyword(s):  
Mechanical Properties ◽  
Laboratory Tests ◽  
Slope Failure ◽  
Engineering Properties ◽  
High Plasticity ◽  
Slope Failures ◽  
Lime Treatment ◽  
Embankment Slope ◽  
The Stability ◽  
Highway Embankment

A comprehensive investigation was designed and conducted to identify the potential causes of failure of a highway embankment slope in Texas and evaluate the effectiveness of lime treatment to rehabilitate the failed slope. Highway slopes built with high plasticity clays often experience shallow slope failures after exposure to repeated wet–dry weathering cycles. Lime stabilization generally reduces the swell–shrink potential, enhances the engineering properties of problematic clayey soils, and can potentially prevent surficial slope failures. However, exposure to wet–dry cycles can negate some of the benefits of lime treatment and therefore a study was conducted to address the use of this lime treatment to stabilize embankment slopes. Extensive laboratory tests were conducted to study the effect of weathering cycles on the degradation of hydro-mechanical properties of untreated and lime-treated soils. Rainfall-induced slope stability analyses were performed to investigate the probable causes of slope failure and evaluate the stability of lime-treated surficial slope. The optimum stabilizer dosage and treated layer thickness required for the slope rehabilitation were determined based on laboratory tests and numerical analysis results. The stability analysis results indicate that the degradation of surficial soil’s hydro-mechanical properties and the development of a perched water table during prolonged rainfall possibly caused the slope failure. The post-treatment increase in shear strength properties, reduction in moisture fluctuations recorded by embedded moisture sensors, and the presence of newly installed underlying drains are expected to prevent recurrence of surficial slope failures. Salient results from this study are covered in this paper.

scholarly journals Liquefaction analysis of abrasion protection structure in Padang

2018 ◽  
Vol 229 ◽  
pp. 01018
Author(s):  
Abdul Hakam ◽  
Bayu M Adji ◽  
Junaidi ◽  
Risayanti
Keyword(s):  
Grain Size ◽  
Physical Properties ◽  
Sand Soil ◽  
Liquefaction Resistance ◽  
Liquefaction Potential ◽  
Construction Design ◽  
The Stability ◽  
Stability Of Structure ◽  
Liquefaction Analysis

The liquefaction potential of a soil deposit is an important aspect to consider the stability of structure due to the earthquake. The liquefaction may also contribute to the safety of coastal constructions. The assessment of liquefaction potential can be started by having the physical properties of sandy soil that include grain size and density. Those parameters had known to give effects to the liquefaction resistance. Those physical properties of sand soil associated with liquefaction resistance must be tested in the laboratory. A case study of a real construction design in Padang, Indonesia is discussed here. The liquefaction potential was assessed using the Density-Grain size methods. The suggested solution to treat those problems is then provided. The compaction treatment to reach a certain relative density before the construction on site may avoid the liquefaction potential and save the coastal structure.

scholarly journals Analisis Stabilitas Lereng Dengan Perkuatan Geotekstil Woven Akibat Pengaruh Termal Menggunakan Metode Elemen Hingga. (Hal. 61-72)

2019 ◽  
Vol 5 (2) ◽  
pp. 61
Author(s):  
Imron Maulana Fauzi ◽  
Indra Noer Hamdhan
Keyword(s):  
Thermal Expansion ◽  
Stability Analysis ◽  
Slope Stability ◽  
Thermal Effect ◽  
Thermal Capacity ◽  
Soil Reinforcement ◽  
Effect Analysis ◽  
Soil Parameter ◽  
Embankment Slope ◽  
The Stability

ABSTRAKAda beberapa jenis perkuatan tanah untuk mengantisipasi longsoran yang sering digunakan di Indonesia seperti halnya geotekstil. Analisis stabilitas dilakukan pada lereng timbunan dengan kemiringan 1V:1H, 1V:1,5H dan 1V:2H dengan membandingkan kondisi lereng timbunan tanpa perkuatan geotekstil, lereng timbunan dengan perkuatan geotekstil serta lereng timbunan dengan perkuatan geotekstil yang dipengaruhi oleh termal menggunakan software PLAXIS 2D 2017. Analisis pengaruh termal dilakukan dengan memvariasikan besaran nilai suhu dan parameter termal tanah (kapasitas, konduktivitas dan ekspansi). Terjadi penurunan stabilitas lereng timbunan dengan perkuatan geotekstil yang diakibatkan oleh semakin besarnya nilai suhu termal dan terjadi peningkatan stabilitas lereng dengan perkuatan geotekstil akibat meningkatnya nilai ekspansi termal, sedangkan nilai konduktivitas dan kapasitas termal tidak berpengaruh.   Kata kunci: lereng timbunan, geotekstil, stabilitas, suhu, parameter termal tanah. ABSTRACTThere are several types of soil reinforcement to anticipate landslide that are often used in Indonesia as well as geotextile. The stability analysis is carried out on the slope of the embankment with a slope of 1V:1H, 1V:1,5H and 1V:2H by comparing the slope conditions of the embankment without geotextile reinforcement, slope of embankment with geotextile reinforcement and slope of embankment with geotextile reinforcement that influenced by thermal using PLAXIS 2D 2017. The thermal effect analysis is carried out by varying the value of temperature and soil thermal parameters (capacity, conductivity and expansion). There is a decrease in the stability of the embankment slopes with geotextile reinforcement caused by the increasing thermal temperature value and an increase in slope stability with geotextile reinforcement due to the increase of thermal expansion value, while the conductivity and thermal capacity have no effect.Keywords:  embankment slope, geotextile, stability, temperature, thermal soil parameter.

scholarly journals Effect of grain shape to potential liquefaction

2020 ◽  
Vol 156 ◽  
pp. 02014
Author(s):  
Arif Rahman
Keyword(s):  
Sandy Soil ◽  
Laboratory Tests ◽  
Grain Shape ◽  
Sandy Soils ◽  
Soil Liquefaction ◽  
Liquefaction Potential ◽  
Soil Particles ◽  
Different Shapes

Earthqueke is one of the most frequent disaster in Indonesia, Earthqueke have caused losses both in terms of life and material. An earthquake also can trigger to soil liquefaction. Attention to liquefaction in Indonesia has raised after the Palu Earthquake in 2018. Liquefaction may happen in sandy soil in certain condition. Here, a series laboratory tests to study potentially liquefied in sandy soils is conducted. The liquefaction potential of sand are analyzed with the effect of the shape of the soil particles. The sandy sample is made up by special selected in three different shapes that are sharp, angular and round. Finally, it can be seen the effect of the shape of the soil grain on the liquefaction potential. The results of this study can be used to further investigation in order to mitigate the liquefaction.

scholarly journals Slope stability analysis of the drainage tunnel portal in Tanju Dam, Dompu District, West Nusa Tenggara

2021 ◽  
Vol 325 ◽  
pp. 01016
Author(s):  
Edden Umaga Dinata ◽  
I Gde Budi Indrawan ◽  
Arifudin Idrus
Keyword(s):  
Stability Analysis ◽  
Laboratory Tests ◽  
Limit Equilibrium ◽  
Friction Angle ◽  
Limit Equilibrium Method ◽  
Drill Core ◽  
Drainage Tunnel ◽  
The Stability ◽  
Core Evaluations ◽  
Tunnel Portal

This paper presents design results of the tunnel portal slopes at the Tanju Dam, Dompu, West Nusa Tenggara. The objective of this research was to analyse the stability of the tunnel portal slopes using circular failure chart (CFC) method, limit equilibrium method (LEM), and finite element method (FEM). Input parameters were obtained from drill core evaluations and laboratory tests. By considering the rock mass rating (RMR) values of rock masses, which are categorized as class II, at the two slopes, adjustments for the cohesion and inner friction angle values are made. The inlet slope (IL) have cohesion values of 350 kPa and 40º inner friction angle and the outlet slope (OL) have cohesion values of 400 kPa and 45º inner friction angle. The CFC method shows that the IL and OL have safety factor (FS) values of 3.5 and 3.44, respectively. The LEM shows that the IL and OL have the FS values of 3.69 and 3.65, respectively. Meanwhile, the FEM shows that the IL and OL have FS values of 4.78 and 4.79, respectively. The stability analysis results indicate that designed slopes are stable.

Stability Analysis of the Nanjung Water Diversion Twin Tunnels based on Convergence Measurement

2019 ◽  
Vol 1 (1) ◽  
pp. 49-60
Author(s):  
Simon Heru Prassetyo ◽  
Ganda Marihot Simangunsong ◽  
Ridho Kresna Wattimena ◽  
Made Astawa Rai ◽  
Irwandy Arif ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Convergence Rate ◽  
Critical Strain ◽  
Convergence Rates ◽  
Strain Analysis ◽  
Water Diversion ◽  
Tunnel Face ◽  
Tunnel Stability ◽  
The Stability ◽  
Twin Tunnels

This paper focuses on the stability analysis of the Nanjung Water Diversion Twin Tunnels using convergence measurement. The Nanjung Tunnel is horseshoe-shaped in cross-section, 10.2 m x 9.2 m in dimension, and 230 m in length. The location of the tunnel is in Curug Jompong, Margaasih Subdistrict, Bandung. Convergence monitoring was done for 144 days between February 18 and July 11, 2019. The results of the convergence measurement were recorded and plotted into the curves of convergence vs. day and convergence vs. distance from tunnel face. From these plots, the continuity of the convergence and the convergence rate in the tunnel roof and wall were then analyzed. The convergence rates from each tunnel were also compared to empirical values to determine the level of tunnel stability. In general, the trend of convergence rate shows that the Nanjung Tunnel is stable without any indication of instability. Although there was a spike in the convergence rate at several STA in the measured span, that spike was not replicated by the convergence rate in the other measured spans and it was not continuous. The stability of the Nanjung Tunnel is also confirmed from the critical strain analysis, in which most of the STA measured have strain magnitudes located below the critical strain line and are less than 1%.

scholarly journals Review of the relationship between aggregates geology and Los Angeles and micro-Deval tests

2021 ◽  
Vol 80 (3) ◽  
pp. 1963-1980
Author(s):  
Solomon Adomako ◽  
Christian John Engelsen ◽  
Rein Terje Thorstensen ◽  
Diego Maria Barbieri
Keyword(s):  
Los Angeles ◽  
Crystal Size ◽  
Grain Shape ◽  
Mechanical Performance ◽  
Pore Space ◽  
Construction Material ◽  
Engineering Properties ◽  
Coarse Grained ◽  
The Impact ◽  
The Relationship

AbstractRock aggregates constitute the enormous volume of inert construction material used around the globe. The petrologic description as igneous, sedimentary, and metamorphic types establishes the intrinsic formation pattern of the parent rock. The engineering properties of these rocks vary due to the differences in the transformation process (e.g. hydrothermal deposits) and weathering effect. The two most common mechanical tests used to investigate the performance of aggregates are the Los Angeles (LA) and micro-Deval (MD) tests. This study reviewed the geological parameters (including mineralogy, grain and crystal size, grain shape, and porosity) and the relationship to Los Angeles and micro-Deval tests. It was found that high content of primary minerals in rocks (e.g. quartz and feldspar) is a significant parameter for performance evaluation. Traces of secondary and accessory minerals also affect the performance of rocks, although in many cases it is based on the percentage. Furthermore, some studies showed that the effect of mineralogic composition on mechanical strength is not sufficient to draw final conclusions of mechanical performance; therefore, the impact of other textural characteristics should be considered. The disposition of grain size and crystal size (e.g. as result of lithification) showed that rocks composed of fine-grain textural composition of ≤ 1 mm enhanced fragmentation and wear resistance than medium and coarse grained (≥ 1 mm). The effect of grain shape was based on convex and concave shapes and flat and elongated apexes of tested samples. The equidimensional form descriptor of rocks somehow improved resistance to impact from LA than highly flat and elongated particles. Lastly, the distribution of pore space investigated by means of the saturation method mostly showed moderate (R = 0.50) to strong (R = 0.90) and positive correlations to LA and MD tests.

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