Influence of Soft Clay on Slope Stability

2015 ◽  
Vol 754-755 ◽  
pp. 463-467
Author(s):  
Zuhayr Md Ghazaly ◽  
Mustaqqim Abdul Rahim ◽  
Nur Fitriah Isa ◽  
Liyana Ahmad Sofri ◽  
Muhammad Azizi Azizan ◽  
...  
Keyword(s):  
Slope Stability ◽  
Soft Clay ◽  
Soil Strength ◽  
Soil Samples ◽  
Grain Size Analysis ◽  
Unit Weight ◽  
Size Analysis ◽  
Time Range ◽  
High Water Content ◽  
Major Disaster

Slope stability is very important on designing a safe slope. If this were to be taken lightly by the engineer, major disaster will occur that results in lost of lives. Each engineer is responsible to evaluate all aspects of design, especially when designing a slope gradient on the surface of soft clay. Soft clay containing high water content and if not planned properly, water from the soft clay will seep into the slope and causes reduction in soil strength. The purpose of this research was to investigate the effect of water absorption of soft clay on the stability of the slope. The objectives of this study were to analyze the soil strength when the soil were soaked in water to a set of different time range and to analyze slope stability on soft clay based on the infiltration of water from underground using PLAXIS software. In this study, soil samples were taken and laboratory experiments were carried out to obtain the unit weight, cohesion, and friction angle of the soil samples. The experiments involved were grain size analysis test and unconfined compression test. Data from the experiments will be used in PLAXIS software to obtain the factor of safety.

scholarly journals Geotechnical Properties of Termite Mound Soil as Construction Material

2020 ◽  
pp. 45-58
Author(s):  
Hammed A. Olayiwola ◽  
K. A. Apanpa ◽  
Anjorin, Ademola
Keyword(s):  
Construction Material ◽  
Soil Samples ◽  
Geotechnical Properties ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Termite Mound ◽  
Termite Mounds ◽  
Cbr Test ◽  
Compressive Strength Test ◽  
Southwest Nigeria

This study investigates variation of termite mounds in relation to the control soils around our environment that are not hindered by the termites at various locations at The Polytechnic; Ibadan, Oyo State, southwest Nigeria. From the study area, five termitaria were selected at random. At the core of termitaria, soil samples were taken at a distance of 7.5m and 15m to the both side of termitaria. Twenty five (25 soil samples were collected in all and were subjected to geotechnical properties such as natural moisture content, grain size analysis, california bearing ratio (CBR) test, Atterberg’s limits, and unconfined compressive strength test. The results proved that termite mound soil have better geotechnical properties compared to surrounding control soil. The betterment was attributed to the activities of termites in termitaria thus increasing the strength parameters present in the soil.

scholarly journals Stabilization of Lateritic Soil Admixed with Maize Husk Ash

2018 ◽  
Vol 1 (March 2018) ◽  
Author(s):  
J.R Oluremi ◽  
K.O Fagbenro ◽  
O.M Osuolale ◽  
A.M Olawale
Keyword(s):  
Construction Materials ◽  
Particle Size Analysis ◽  
Liquid Limit ◽  
Soil Samples ◽  
Grain Size Analysis ◽  
Lateritic Soil ◽  
Size Analysis ◽  
Unconfined Compression Test ◽  
Road Pavement ◽  
Stabilized Soil

Lateritic soil is one of the major construction materials in road pavement. However, obtaining lateritic soil with sufficient strength is difficult, which may necessitate its improvement by stabilization. Lateritic soil, in this study, was stabilized with upto 12% Maize Husk Ash (MHA) by weight of soil samples, with a view of improving its geotechnical properties and assessing it as subbase materials. Classification tests (particle size analysis, specific gravity, Atterbergs limits) and strength index tests (compaction, california bearing ratio (CBR), unconfined compression test (UCS) were performed on both the natural and the MHA-stabilized soil samples. The grain size analysis shows that the percentage passing No. 200 BS sieve was 47.7% for the natural lateritic soil and between 50 and 62.1% for MHA stabilized lateritic soil. The liquid limit, plastic limit and plasticity index are in the range of 61 to 76%, 28 to 53% and 16 to 37% respectively. Also, the maximum dry densities increased, while the optimum water content decreased with increase in the MHA content. The CBR value of the lateritic soil increased with MHA content up till 6% addition of MHA and thereafter decreased, while higher UCS value was obtained up till 3% and then decreased with increasing content of MHA. The results indicated that the MHA stabilized lateritic soil could only be used as subgrade and fill materials.

scholarly journals Engineering soil properties of Bhaktapur pottery

2017 ◽  
Vol 4 ◽  
pp. 38-40
Author(s):  
Ratna Shova Prajapati ◽  
Rameshwor Shrestha
Keyword(s):  
Clay Content ◽  
Liquid Limit ◽  
Soil Samples ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
High Tendency ◽  
Specific Location ◽  
Plasticity Limit ◽  
Ceramic Manufacture ◽  
Engineering Soil

Pottery is one of the historic occupations of people of Bhaktapur. The tradition has been handed over to many successors, and the culture is still alive. Pottery in Bhaktapur municipality is concentrated in two parts namely; Suryamadi and Pottery-Square. The pottery work is adopted by ethnic group Prajapati, only they produce ceramic products in Bhaktapur municipality. Potters collect soil from specific location of Bhaktapur; Kamalbinayak, Nangakhel, Sipadol, and Tathali, which is suitable soil for ceramic manufacture. The soil samples from pottery site Suryamadi and Pottery-Square were collected. Grain size analysis, liquid limit and plasticity limit were tested. From the analysis, the soil sample from Pottery-Square was found to be finer than that from Suryamadi. Clay content and moisture holding capacity of the Suryamadi pottery work are greater than that of Pottery-Square pottery work. It shows that the Suryamadi pottery work had high tendency to get cracks and crumbled.

Stabilization of Clayey Soil by Using Metakaolin and Sugarcane Ash

2021 ◽  
Author(s):  
Zainab Abdul Zahra ◽  
◽  
Mahmood Ahmed ◽  
Ibrahim Al-Ani ◽  
◽  
...  
Keyword(s):  
Shear Strength ◽  
Clayey Soil ◽  
Soft Soil ◽  
Soft Clay ◽  
Base Material ◽  
High Water ◽  
Unit Weight ◽  
High Water Content ◽  
Natural Soil ◽  
Shear Strength Test

Soft clay is a natural soil that spreads in the south of Iraq and many countries in the world. It is a problematic soil causing trouble for the structures built on it because of, high water content, low shear strength, and high compressibility. This work investigated the geotechnical behavior of soft clay by using mix of Metakaolin (M) and Sugarcane Straw Ash in air (SCSAA).The experimental work contains the following tests: chemical tests, physical tests, Compaction tests and shear test. These tests were carried out on soil samples prepared from soft soil; the replacement materials by weight of dry unit weight for different percentages of M (4%, 6%, 8%, 10%) mix with different percentages of SCSAA (4%, 6%, 8%, 10%). The tests results showed that the best percentage for the plasticity test was M1B4. Also,the percentage which gave the best value for undrained shear strength test was M4B4 (135).Finally, the treatment soil is good sub grade materials and also can be used in highway sub-base material.

scholarly journals Geochemical and Mineralogical Characterisation of Historic Zn–Pb Mine Waste, Plombières, East Belgium

Minerals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 28
Author(s):  
Srećko Bevandić ◽  
Rosie Blannin ◽  
Jacqueline Vander Auwera ◽  
Nicolas Delmelle ◽  
David Caterina ◽  
...  
Keyword(s):  
Grain Size ◽  
Mine Waste ◽  
Geophysical Methods ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Mine Wastes ◽  
Metallurgical Waste ◽  
High Concentration ◽  
Geochemical Properties ◽  
Potential Applications

Mine wastes and tailings derived from historical processing may contain significant contents of valuable metals due to processing being less efficient in the past. The Plombières tailings pond in eastern Belgium was selected as a case study to determine mineralogical and geochemical characteristics of the different mine waste materials found at the site. Four types of material were classified: soil, metallurgical waste, brown tailings and yellow tailings. The distribution of the mine wastes was investigated with drill holes, pit-holes and geophysical methods. Samples of the materials were assessed with grain size analysis, and mineralogical and geochemical techniques. The mine wastes dominantly consist of SiO2, Al2O3 and Fe2O3. The cover material, comprising soil and metallurgical waste is highly heterogeneous in terms of mineralogy, geochemistry and grain size. The metallurgical waste has a high concentration of metals (Zn: 0.1 to 24 wt.% and Pb: 0.1 to 10.1 wt.%). In the tailings materials, Pb and Zn vary from 10 ppm to 8.5 wt.% and from 51 ppm to 4 wt.%, respectively. The mining wastes comprises mainly quartz, amorphous phases and phyllosilicates, with minor contents of Fe-oxide and Pb- and Zn-bearing minerals. Based on the mineralogical and geochemical properties, the different potential applications of the four waste material types were determined. Additionally, the theoretical economic potential of Pb and Zn in the mine wastes was estimated.

scholarly journals Centennial Impacts of the East Asian Summer Monsoon on Holocene Deltaic Evolution of the Huanghe River, China

2021 ◽  
Vol 11 (6) ◽  
pp. 2799
Author(s):  
Yanping Chen ◽  
Wenzhe Lyu ◽  
Tengfei Fu ◽  
Yan Li ◽  
Liang Yi
Keyword(s):  
Grain Size ◽  
Yellow River ◽  
Asian Summer Monsoon ◽  
River Delta ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Sediment Grain Size ◽  
Huanghe River ◽  
Huanghe River Delta ◽  
The Huanghe River

The Huanghe River (Yellow River) is the most sediment laden river system in the world, and many efforts have been conducted to understand modern deltaic evolution in response to anthropological impacts. However, the natural background and its linkage to climatic changes are less documented in previous studies. In this work, we studied the sediments of core YDZ–3 and marine surface samples by grain-size analysis to retrieve Holocene dynamics of the Huanghe River delta in detail. The main findings are as follows: The mean value of sediment grain size of the studied core is 5.5 ± 0.9 Φ, and silt and sand contents are 5.2 ± 2.3% and 8.2 ± 5.3%, respectively, while the variance of clay particles is relatively large with an average value of 86.4 ± 8.5%. All grain-size data can be mathematically partitioned by a Weibull-based function formula, and three subgroups were identified with modal sizes of 61.1 ± 28.9 μm, 30.0 ± 23.9 μm, and 2.8 ± 1.6 μm, respectively. There are eight intervals with abrupt changes in modal size of core YDZ–3, which can be correlated to paleo-superlobe migration of the Huanghe River in the Holocene. Based on these observations, the presence of seven superlobes in the history are confirmed for the first time and their ages are well constrained in this study, including Paleo-Superlobes Lijin (6400–5280 yr BP), Huanghua (4480–4190 yr BP), Jugezhuang (3880–3660 yr BP), Shajinzi (3070–2870 yr BP), Nigu (2780–2360 yr BP), Qikou (2140–2000 yr BP), and Kenli (1940–1780 and 1700–1650 yr BP). By tuning geomorphological events to a sedimentary proxy derived from core YDZ–3 and comparing to various paleoenvironmental changes, we proposed that winter climate dominated Holocene shifts of the Huanghe River delta on millennial timescales, while summer monsoons controlled deltaic evolution on centennial timescales.

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