scholarly journals Regional Geotechnical Mapping Employing Kriging on Electronic Geodatabase

2020 ◽  
Vol 10 (21) ◽  
pp. 7625
Author(s):  
Muhammad Usman Arshid ◽  
M. A. Kamal
Keyword(s):  
Bearing Capacity ◽  
Soil Classification ◽  
Geostatistical Analysis ◽  
Kriging Interpolation ◽  
Geospatial Information ◽  
State Highway ◽  
Capacity Evaluation ◽  
Geotechnical Investigations ◽  
Allowable Bearing Capacity ◽  
Spatial Analyst

A regional geotechnical map was developed by employing kriging using spatial and s geostatistical analysis tools. Many studies have been carried out in the field of topography, digital elevation modeling, agriculture, geological, crop, and precipitation mapping. However, no significant contribution to the development of geotechnical mapping has been made. For the appraisal of a geotechnical map, extensive field explorations were carried out throughout the geotechnically diversified plateau spread over an area of approximately 23,000 km2. In total, 450 soil samples were collected from 75 data stations to determine requisite index properties and soil classification for the subsequent allowable bearing capacity evaluation. The formatted test results, along with associated geospatial information, were uploaded to ArcMap, which created an initial input electronic database. The kriging technique of geostatistical analysis was determined to be more feasible for generating a geotechnical map. The developed map represents the distribution of soil in the region as per the engineering classification system, allowable bearing capacity, and American Association of State Highway and Transportation Officials (AASHTO) subgrade rating for 1.5-, 3.0-, and 4.5-m depths. The accuracy of the maps generated using kriging interpolation technique under spatial analyst tools was verified by comparing the values in the generated surface with the actual values measured at randomly selected validation points. The database was primarily created for the appraisal of geotechnical maps and can also be used for preliminary geotechnical investigations, which saves the cost of soil investigations. In addition, this approach allows establishing useful correlations among the geotechnical properties of soil.

scholarly journals Estimating CPT Parameters at Unsampled Locations Based on Kriging Interpolation Method

2021 ◽  
Vol 11 (23) ◽  
pp. 11264
Author(s):  
Jinhao Liu ◽  
Jinming Liu ◽  
Zhongwei Li ◽  
Xiaoyu Hou ◽  
Guoliang Dai
Keyword(s):  
Bearing Capacity ◽  
Direct Method ◽  
Precast Concrete ◽  
Kriging Interpolation ◽  
Soil Parameters ◽  
Engineering Practice ◽  
Kriging Method ◽  
True Value ◽  
Kriging Interpolation Method ◽  
Geotechnical Investigations

The cone penetrometer test (CPT) has been widely used in geotechnical investigations. However, how to use the limited CPT data to reasonably predict the soil parameters of the unsampled regions remains a challenge. In the present study, we adopted the Kriging method to obtain the CPT data of an unsampled location in Adelaide, South Australia, based on the collected CPT data from six soundings around this location. Interpolation results showed that the trend of the estimated parameters is consistent with the trend of parameters of the surrounding points. From the Kriging interpolation result, we further carried out axial bearing capacity calculation of a precast concrete pile using the CPT-based direct method to verify the reliability of the method. The calculated bearing capacity of the pile is 99.6 kN which is very close to the true value of 102.8 kN. Our results demonstrated the effectiveness of the Kriging method in considering the soil spatial variability and predicting soil parameters, which is quite suitable for the application in engineering practice.

scholarly journals PERBANDINGAN PENGGUNAAN SEMEN DAN GARAM UNTUK STABILISASI TANAH DASAR

2019 ◽  
Vol 12 (2) ◽  
pp. 93
Author(s):  
Zuhrufah Diana Azza, Gerard Aponno, Dwi Ratnaningsih
Keyword(s):  
Bearing Capacity ◽  
Classification System ◽  
Soil Stabilization ◽  
American Association ◽  
Road Construction ◽  
Soil Classification ◽  
High Plasticity ◽  
The Road ◽  
State Highway ◽  
Before And After

Soil is the key of the road foundations. Soil of high CBR value will have good bearing capacity for road construction. Conversely, soil stabilization must be carried out to the subgrade that has bad bearing capacity. The goals of this analysis are to find out the soil characteristict of before stabilization, CBR values of before and after stabilization, the optimum cement use and salt (NaCl) use as stabilizers.The results of soil poperties test in Silt High Plasticity (MH) based on Unified Soil Classification System (USCS) and A-7-5 based on American Association of State Highway and Transportation Official (AASHTO). The result of CBR without stabilization is 3.64% for standard soaked and 5.13%  for modified soaked. The maximum results of stabilized testing with cement showed 9.802 % CBR; 69.298% CBR of each sample respectively standard and modified soaked test; of salt showed 3.93% CBR; 5.33% CBR of standard and modified soaked test of each sample respectively.   Keywords: CBR, cement, NaCl, soil stabilization

scholarly journals Engineering Subsoil Characterization for Shallow Foundation Design in Ode Irele Area of Ondo State, Southwestern Nigeria

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
Olumuyiwa O. Falowo ◽  
Michael B. Amodu
Keyword(s):  
Bearing Capacity ◽  
Shallow Foundation ◽  
Soil Conditions ◽  
Cone Penetration ◽  
Foundation Design ◽  
Southwestern Nigeria ◽  
Foundation Soil ◽  
Geotechnical Investigations ◽  
Allowable Bearing Capacity ◽  
Coastal Sand

Integrated geophysical and geotechnical investigations for foundation design have proved to be good veritable tools in effective foundation design and construction. Geophysical and geotechnical methods involving electrical resistivity and cone penetration test have been carried out to investigate the foundation soil conditions of Ode Irele, southwestern Nigeria. Six vertical electrical sounding (VES) were carried out along two traverses; which is complemented by two cone penetration tests with seven trial tests at different subsurface depths. The geotechnical results showed that the soils are sand and silt dominated. All the tested parameters fall within the Nigeria federal ministry of works and housing specification with liquid limit (< 50%), plastic limit (< 30%), plasticity index (< 20%). The geoelectric sections identified maximum of six geoelectric/geologic subsurface layers comprising the topsoil (red sand), weathered layer (made up of coastal sand/white sand), clayey sand (which is the major aquitard in the area), intermediate sand aquifer unit. However the coastal sand layer has moderately high resistivity at shallow depth to sustain foundation load with thickness greater than 2 m. The groundwater level measured from existing borehole records 17.5 m which may not or seriously affect the bases of the foundation footing. Consequently an average allowable bearing capacity of 150 KN/m2 (ultimate bearing capacity of 450 KN/m2) would be appropriate for design of shallow foundation in the area, at a depth not less than 1.6 m in Ode Irele and 0.8 m at Ajagba. The foundation width of 0.6 m would produce minimum bearing settlement less than 25 mm. The appropriate (recommended) ultimate bearing and allowable bearing capacity for strip and square footings at depth levels of 0.6 – 1.2 m vary from 1486 – 1842 KN/m2 and 495 - 614 KN/m2; and 2056 – 2489 KN/m2 and 685 - 830 KN/m2 respectively.

scholarly journals Perbandingan Kepadatan Kering Tanah Lempung Distabilisasi Serbuk Arang Tempurung Kelapa dengan Serbuk Arang Bambu

2021 ◽  
Vol 9 (2) ◽  
pp. 139-146
Author(s):  
Yayuk Apriyanti ◽  
Ovin Sahara ◽  
Aisah Fitri ◽  
Ferra Fahriani
Keyword(s):  
Bearing Capacity ◽  
Clay Soil ◽  
Soil Classification ◽  
Coconut Shell ◽  
Dry Density ◽  
Bamboo Charcoal ◽  
Basic Part ◽  
State Highway ◽  
The Difference ◽  
Coconut Shells

Clay soil is the basic part of a building construction, but such type of soil has the stability problems, hence it needs to be stabilized to increase its bearing capacity. Some natural materials in Bangka Belitung Province have not been optimally utilized, e.g. coconut shells and bamboo, which can be used as stabilization materials. In this article, we compare the dry density of clay soil mixed with coconut shell charcoal powder to clay soil mixed with bamboo charcoal powder. The percentage of stabilizing material used is 5%, 10% and 15% of the dry soil weight. Soil classification is based on the Unified Soil Classification System (USCS) standard including the low plasticity inorganic clay (CL) group and following the standards of the American Association of State Highway and Transportation Officials Classification (AASHTO) including the A-6 soil group. The compaction test result show that the dry density of the clay soil increases with the addition of stabilization agent using either coconut shell charcoal powder or bamboo charcoal powder. The results were almost the same where the difference was only about 0.001 (gr / cm3) for the stabilizer mixture of 5% and 10% as well as the difference of 0.002% (gr / cm3) for the stabilizer mixture of 15%. The increase in soil dry density indicates that the bearing capacity of clay soil increases with the increase in the percentage of stabilizing material

Development of allowable bearing capacity for strip foundations in unsaturated soils

2019 ◽  
Vol 114 ◽  
pp. 103138 ◽  
Author(s):  
Changguang Zhang ◽  
Benxian Gao ◽  
Qing Yan ◽  
Junhai Zhao ◽  
Lizhou Wu
Keyword(s):  
Bearing Capacity ◽  
Unsaturated Soils ◽  
Allowable Bearing Capacity

scholarly journals Geotechnical Investigations of an Earth-Filled Site for Construction of a Building

2020 ◽  
Vol 18 (02) ◽  
pp. 71-74
Author(s):  
Riaz Bhanbhro ◽  
Zafar Ali Siyal ◽  
Bashir Ahmed Memon ◽  
Shahnawaz Zardari ◽  
Amjad Hussain Bhutto ◽  
...  
Keyword(s):  
Friction Angle ◽  
Complex Materials ◽  
Strength Parameters ◽  
Strain Behavior ◽  
The Earth ◽  
Undisturbed Samples ◽  
Geotechnical Investigations ◽  
Allowable Bearing Capacity ◽  
Allowable Load ◽  
Silty Soils

There is a growing need of construction around the globe. This need tends to provide newer opportunities for construction of buildings over reclaimed lands or earth filled areas. Mostly, the earth is filled with soils as it is an easily available material. Soil is a complex materials, and its properties can vary due to several reasons. If not understood properly, it can damage undisturbed samples collected from earth-filled soils. The basic properties of soils, the stress-strain behavior and strength parameters are presented and discussed. Results show that soil exhibits strain hardening and normally consolidated behavior in direct shear and oedometer test respectively. It is observed that the compression index values are in the range of 0.157 to 0.182 which indicates that the material is silty soils with low plasticity. The allowable bearing capacity in our study was 305 kPa and allowable load on footing was 987 kN. The strength parameters, i.e., friction angle and cohesion are 37 degree and 2 kPa respectively.

Nomographs for predicting allowable bearing capacity and elastic settlement of shallow foundation on granular soil

2019 ◽  
Vol 12 (15) ◽  
Author(s):  
Maher Omar ◽  
Abdallah Shanableh ◽  
Khaled Hamad ◽  
Ali Tahmaz ◽  
Mohamed G. Arab ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Shallow Foundation ◽  
Granular Soil ◽  
Allowable Bearing Capacity ◽  
Elastic Settlement

Bearing capacity of soils for crawler cranes

2008 ◽  
Vol 45 (9) ◽  
pp. 1282-1302 ◽  
Author(s):  
Xiteng Liu ◽  
Dave H. Chan ◽  
Brian Gerbrandt
Keyword(s):  
Computer Simulation ◽  
Bearing Capacity ◽  
Soil Type ◽  
Traditional Method ◽  
Design Procedure ◽  
Field Studies ◽  
Shallow Foundations ◽  
Allowable Bearing Capacity ◽  
Total Settlement

Few studies have been carried out on the bearing capacity of soils for crawler cranes. Directly applying the bearing capacity equations used for shallow foundations to cranes often leads to conservative design. The total settlement is of less concern for cranes than for buildings, and cranes can normally tolerate larger differential settlements. Computer simulation and field studies have been carried out to study the allowable bearing capacity of soils for cranes. Equations modified from the traditional method to calculate the bearing capacity for shallow foundations have been proposed. In general, it was found that the bearing capacity for crawler cranes could be increased by as much as 50% from that for foundations. This depends on the soil type, crane, and mat configuration. A design procedure in evaluating foundation support for crawler cranes is also proposed.

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