The numerical model for parametric studies of forest haul roads pavements

Low volume roads in the Czech Republic are roads with lower traffic volume that primarily include forest and field roads, and they are an integral part of the Czech transport network. When building road pavements, we can use processes for surveying, designing, building and inspecting road constructions included in national and international, particularly European, standards. In addition, the roads are evaluated in terms of their environmental impacts, in order to maintain the quality of the environment. However, during the construction of road pavements decisions based on financial, time and other reasons are made. The decisions have impacts on the operation of roads and lead to other measures and additional costs of repairs and reconstructions. The article summarizes the authors’ research results from constructions of low volume road pavements and contains evaluations of laboratory and in situ material tests (soils, layers) of installed road pavements as well as evaluations of modelled laboratory and long-term monitored in situ structures.

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“…displacements U x and U y . The individual construction layers are considered to be perfectly bonded (Ševelová, Kozumplíková 2010).…”

Section: Stochastic Analysis Of Road Pavement Compositions and Subgrade Modification Testsmentioning

confidence: 99%

Optimization of low volume road pavement design and construction

Hauser¹,

Ševelová²,

Matula³

et al. 2018

J. For. Sci.

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“…The performed numerical simulations [17] show that the behavior of roads is mainly affected by the subgrade load bearing capacity. In the numerical analyses performed, based on finite element (FE) models, the subgrade resilient modulus has a dominant influence on the resulting behavior and thus on the quality of the road structure as a whole [18]. Therefore, an extensive experimental study of subgrade soils was proposed to monitor their behavior during cyclic testing on the CBR device.…”

Section: Introductionmentioning

confidence: 99%

Using Resilient Modulus to Determine the Subgrade Suitability for Forest Road Construction

Ševelová

Florian

Hrůza

2020

Forests

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Forest roads are often constructed in environments with low bearing capacity of the subgrade. The subgrade then has an effect on their service life and damage. According to the methodology of the American Association of State Higway and Transportation Officiales AASHTO, the design of pavement is divided into three levels according to the intensity of the traffic load. For pavements with the highest load intensity, preparing the resilient modulus from a cyclic triaxial test is required. For other traffic load classes, including forest roads, the methodology allows the use of the estimate of resilient modulus value determined from other tests. In the laboratory at the Faculty of Forestry, Mendel University of Brno, the method from the Delft University 2009 was tested and subsequently modified, using a standard CBR machine for repeated loading. A total of 276 samples from various types of forest road subgrade from the Czech Republic were tested by the method of repeated loading on the CBR machine, from which the values of the Resilient Modulus were newly labelled Mr,CBR. The results of the statistical analysis showed a large variability of Mr,CBR values and wide intervals of its occurrence for individual types of subgrade. The variability was subjected to analysis and the influence of basic geotechnical parameters on the values of Mr,CBR was analyzed. A fundamental correlation was found between the value of Mr,CBR and the value of the plunger stress, which reached values exceeding the bearing capacity of the soil types using the Delft University method. It is necessary to limit the plunger stress during cyclic loading up to the failure limit or even better to the expected traffic load. The modified procedure results show a more consistent behavior of the modulus.

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“…To improve the quality of low volume roads the computer simulation of their behavior using FEM model is proposed Ševelová and Kozumplíková (2010). To obtain the most accurate results from such a model it is necessary to work with the exact values of the modulus of elasticity (Young modulus) of individual materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of Environmental Humidity on Mechanical Properties of Natural and Recycled Unbound Materials

Florian¹,

Ševelová²,

Žák³

2015

Acta Univ. Agric. Silvic. Mendelianae Brun.

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Low volume roads are widely used all over the world. To improve their quality a FEM computer simulation of their behavior is proposed. The input information about mechanical properties of individual materials is crucial for obtaining results as exact as possible. Among others, the mechanical properties are generally dependent on the state of stress and on humidity conditions. For this purpose the cyclic-load triaxial machine testing of cyclic-load performance of materials seems to be a promising test method. The test specimens can be prepared with diff erent amounts of water. Thus modulus of elasticity (Young modulus) of diff erent materials including recycled ones can be measured under the diff erent conditions of horizontal and vertical stresses and under the diff erent humidity conditions. Using the proposed testing procedure the modulus of elasticity of materials used in the newly built low volume road is obtained under the diff erent state of stress as well as humidity conditions set to standard, dry and fully saturated level. Also recycled materials which are able to replace the traditional materials in the pavement are tested. Obtained values of modulus of elasticity can be used in a FEM study of the newly built road.

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The numerical model for parametric studies of forest haul roads pavements

Cited by 4 publications

References 2 publications

Optimization of low volume road pavement design and construction

Optimization of low volume road pavement design and construction

Using Resilient Modulus to Determine the Subgrade Suitability for Forest Road Construction

Influence of Environmental Humidity on Mechanical Properties of Natural and Recycled Unbound Materials

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