Using Synthetic Climate Datasets for Geotechnical and Geoenvironmental Design Problems

2021 ◽  
Author(s):  
Rashid Bashir ◽  
Muhammad Abid Nawaz Sahi ◽  
Jitendra Sharma
Keyword(s):  
Numerical Simulations ◽  
Soil Cover ◽  
Normal Values ◽  
Expansive Soil ◽  
General Purpose ◽  
Swelling Potential ◽  
Design Problems ◽  
Historical Climate ◽  
Cover Design ◽  
Engineering Projects

Location-specific climate datasets are required for the design and evaluation of a number of civil engineering projects. It requires huge effort to compile a multi-year quality-controlled climate dataset. In this paper, a method of generating simulated daily climate variables of interest from readily-available climate normal using a general purpose weather generator SIMETAW is presented. The accuracy of this method is assessed by comparing the climate datasets generated using SIMETAW with the recorded historical climate datasets for nine different sites across Canada with climates ranging from semi-arid to pre-humid. This comparison was done using visual presentations as well as statistical analyses of the two datasets. It was found that the multi-year daily climate datasets generated by SIMETAW using just 12 monthly climate normal values are fairly similar to the recorded historical climate datasets. The usefulness of SIMETAW-generated climate datasets was demonstrated by using them in numerical simulations of three different design problems, namely, infiltration into soils, swelling potential of an expansive soil, and soil cover design. From the results of these numerical simulations, it is concluded that the SIMETAW-generated multi-year daily climate datasets are satisfactory for use in the geotechnical and geoenvironmental problems of the kind simulated herein.

An Overview: to Reduce Swelling Potential of Expansive Soil By Using Polypropylene Material

2018 ◽  
pp. 129-131
Author(s):  
A. A. Musale ◽  
M. A. Mhetre ◽  
A. I. Mukeri ◽  
K. S. Chavan ◽  
R. N. Kawade ◽  
...  
Keyword(s):  
Expansive Soil ◽  
Swelling Potential ◽  
Polypropylene Material

scholarly journals The Use of Geogrids in Mitigating Pavement Defects on Roads Built over Expansive Soils

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Richard Shumbusho ◽  
Gurmel S. Ghataora ◽  
Michael P.N. Burrow ◽  
Digne R. Rwabuhungu
Keyword(s):  
Seasonal Changes ◽  
Expansive Soils ◽  
Expansive Soil ◽  
Real Field ◽  
Experimental Program ◽  
Swelling Potential ◽  
Swelling Behaviour ◽  
Wetting And Drying ◽  
Potential Benefits

This study was conducted to investigate the potential benefits of using geogrids in mitigating pavement defects notably roughness and longitudinal cracking on pavements built over expansive soils. The seasonal changes of expansive soils (periodic wetting and drying) cause detrimental effects on the overlying road pavements. Such detrimental behavior of expansive soils was simulated in a controlled laboratory environment through allowing cyclic wetting and drying of an expansive soil underlying a pavement section. The shrink/swell effects of the expansive soil subgrade were examined through monitoring its change in moisture, and measuring deformation of overlying pavement section. The experimental study suggested that a geogrid layer in a reinforced pavement section can reduce surface differential shrinking and swelling deformation resulting from underlying expansive soils by a factor of 2 and 3 respectively in comparison to unreinforced section. Given that an oedometer test which is typically used to predict swelling potential of expansive soils is known to overpredict in-situ soil swell, experimental program also investigated quantitatively the extent to which the oedometer can overestimate swelling behaviour of the real-field scenarios. It was found that oedometer percent swell can overpredict in-situ swelling behaviour of the expansive soil by a factor ranging between 2 and 10 depending upon the period over which the in-situ expansive soil has been in contact with water.

Nonlinear Integer and Discrete Programming in Mechanical Design

1988 ◽  
Author(s):  
E. Sandgren
Keyword(s):  
Mechanical Design ◽  
General Purpose ◽  
Conceptual Level ◽  
Design Problems ◽  
Design Decisions ◽  
Design Variables ◽  
Nonlinear Mathematical Programming ◽  
Discrete Programming ◽  
Mathematical Programming Problems ◽  
Quadratic Programming Method

Abstract A general purpose algorithm for the solution of nonlinear mathematical programming problems containing integer, discrete, zero-one and continuous design variables is described. The algorithm implements a branch and bound procedure in conjunction with both an exterior penalty function and a quadratic programming method. Variable bounds are handled independently from the design constraints which removes the necessity to reformulate the problem at each branching node. Examples are presented to demonstrate the utility of the algorithm for solving design problems. The use of zero-one variables to represent design decisions in order to allow conceptual level design to be performed is demonstrated.

The Use of Functional Analysis to Ensure Value for Money in Complex Engineering Projects

2019 ◽  
Author(s):  
M Courts
Keyword(s):  
Functional Analysis ◽  
General Purpose ◽  
Intermediate Layers ◽  
Data Value ◽  
Conflicting Objectives ◽  
Data Layer ◽  
Complex Engineering ◽  
And Performance ◽  
The Uk ◽  
Engineering Projects

A technique that has been used successfully in both naval procurements and concept studies used to inform future naval planning is a form of functional analysis using a structured model built up from various layers. These layers can be used to represent different views of a programme. The upper layers can represent the customer requirement and preferences the lower the engineering solutions. The intermediate layers can be used to represent the functional breakdown and performance achieved by the engineering sub systems. Such an approach has been implemented in a general purpose modelling toolset known as BAEFASIP. This software allows appropriate model structures and operators to be constructed in each layer together with the appropriate linkages between layers. Extensive calculation and output facilities allow both the comparison of multiple solutions and the generation of an optimum Pareto front of solutions against multiple conflicting objectives. Engineering limitations and practicalities are accounted for by tailoring the data layer linkage mechanisms, imposing data value constraints and using powerful rule enforcement facilities to control potential option combinations. The approach and toolset have been successfully used to support two Naval procurement programmes in the UK, a patrol vessel and a complex frigate. More recently they have been used to facilitate studies on the optimisation of alternative ship equipment fits against a range of operational requirements and possible future fleet mixes.

Efficient Updated-Lagrangian Simulations in Forming Processes

2015 ◽  
Vol 651-653 ◽  
pp. 1294-1300
Author(s):  
Diego Canales ◽  
Adrien Leygue ◽  
Francisco Chinesta ◽  
Elias Cueto ◽  
Eric Feulvarch ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Numerical Integration ◽  
General Purpose ◽  
Integration Technique ◽  
Numerical Examples ◽  
Nodal Integration ◽  
Out Of Plane ◽  
Material Forming ◽  
Updated Lagrangian ◽  
Stabilized Conforming Nodal Integration

A new efficient updated-Lagrangian strategy for numerical simulations of material forming processes is presented in this work. The basic ingredients are the in-plane-out-of-plane PGD-based decomposition and the use of a robust numerical integration technique (the Stabilized Conforming Nodal Integration). This strategy is of general purpose, although it is especially well suited for plateshape geometries. This paper is devoted to show the feasibility of the technique through some simple numerical examples.

scholarly journals Research on Wetting-Drying Cycles’ Effect on the Physical and Mechanical Properties of Expansive Soil Improved by OTAC-KCl

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Bao-tian Wang ◽  
Can-hong Zhang ◽  
Xue-lian Qiu ◽  
En-yue Ji ◽  
Wen-hui Zhang
Keyword(s):  
Mechanical Properties ◽  
Expansive Soil ◽  
Physical And Mechanical Properties ◽  
Cyclic Strength ◽  
Soil Samples ◽  
Engineering Properties ◽  
Swelling Potential ◽  
Wetting And Drying ◽  
Strength Tests ◽  
Free Swell

Expansive soil experiences periodic swelling and shrinkage during the alternate wet and dry environments, which will result in severe damage to the slope stability. In this study, a promising modifier OTAC-KCl is introduced, which has a good diffusivity and is soluble in water or other solvents easily. Firstly, a reasonable combination of ameliorant 0.3% STAC and 3% KCl is chosen referring to the free swell test. Then, the best curing period, 14 days, is gotten from UCS tests. The effect of wetting and drying cycles on engineering properties of expansive soil improved by OTAC-KCl admixtures after 14-day curing is also studied accordingly. Both treated and untreated expansive soil samples are prepared for the cyclic wetting-drying tests which mainly include cyclic swelling potential and cyclic strength tests. Experimental results show that the swelling potential of expansive soil samples stabilized with OTAC-KCl is suppressed efficiently, and the untreated soil specimens will collapse when immersed in water while the treated specimens keep in good conditions. Moreover, expansive soil samples modified with 0.3% OTAC + 3% KCl show enough durability on the swelling ability, shear strength, and unconfined compressive strength, which means, that both the physical and the mechanical properties of stabilized expansive soil have been improved effectively.

scholarly journals Effect of Pozzolana and Lime on Expansive Soil Properties

2021 ◽  
Vol 9 (3) ◽  
pp. 94-101
Author(s):  
Omer S. M. Hamza ◽  
Magdi M. E. Zumrawi ◽  
Awad E. M. Mohamed
Keyword(s):  
Soil Properties ◽  
Expansive Soil ◽  
Swelling Pressure ◽  
Swelling Potential ◽  
Quick Lime ◽  
Disturbed Soil ◽  
Constant Content ◽  
Pressure Tests ◽  
Free Swell ◽  
Very High

This study investigates the effect of pozzolana and quick lime as stabilizer materials on expansive soil properties. Disturbed soil sample was collected from Al-Qadarif city in east of Sudan. The basic properties, swelling and strength of the soil were measured. The soil shows very weak strength and very high swelling potential. Mineralogical analysis tests were conducted to the soil using XRD tests. The soil contains significant amount of montmorillonite mineral (86%). Laboratory tests were undertaken on soil stabilized with varying percentage of pozzolana only (0, 5, 10, 15, 20, and 30%) and combination of pozzolana with constant content of quick lime (5%). Compaction, California Bearing Ratio (CBR), free swell, swell present and swelling pressure tests were performed on natural and treated soil. The pozzolana was obtained from Jebal Meidob and the lime obtained from local kilns in Kassala. The results showed that the treatment of expansive soil by combination of pozzolana and quick lime reduced soil swelling coupled with significant increase on soil strength. While the use of pozzolana only has marginal effective. It could be concluded that stabilization of expansive soil by pozzolana-lime admixture is successful.  

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