The use of in-situ test method EN 1793-6 for measuring the airborne sound insulation of noise barriers

In the frame of the SOPRANOISE project (funded by CEDR in the Transnational Road Research Programme 2018) the database of the European noise barrier market developed during the QUIESST project was updated with newly acquired data. This database gives the opportunity for an empirical study on the correlation between the different measurement methods for the acoustic properties of noise barriers (according to the EN 1793 series) to further investigate the interrelationships between these methods by using single-number ratings and third-octave band data. First a correlation of the measurement methods for sound absorption under diffuse field conditions (EN 1793-1) and sound reflection under direct sound field conditions (EN 1793-5) is presented. Secondly, a correlation of the measurement methods for airborne sound insulation under diffuse field conditions (EN 1793-2) and airborne sound insulation under direct sound field conditions (EN 1793-6) is shown. While for airborne sound insulation a distinct correlation is found due to the wide data range, for sound absorption no robust correlation can be found.

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In-situ measurements of sound reflection and sound insulation of noise barriers: Validation by means of signal-to-noise ratio calculations

The Journal of the Acoustical Society of America ◽

10.1121/1.4806114 ◽

2013 ◽

Vol 133 (5) ◽

pp. 3451-3451 ◽

Cited By ~ 1

Author(s):

Massimo Garai ◽

Paolo Guidorzi

Keyword(s):

Signal To Noise Ratio ◽

In Situ Measurements ◽

Sound Insulation ◽

Signal To Noise ◽

Noise Barriers ◽

Sound Reflection ◽

Noise Ratio

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Study on Compaction Effect and Process of Reclaimed Soil of Nonmetallic Mines in Xinjiang, China

Advances in Materials Science and Engineering ◽

10.1155/2020/1973458 ◽

2020 ◽

Vol 2020 ◽

pp. 1-15

Author(s):

Kaikai Wang ◽

Zizhao Zhang ◽

Guobin Tang ◽

Xiaodong Tan ◽

Qianli Lv ◽

...

Keyword(s):

Numerical Simulation ◽

Land Reclamation ◽

Simulation Method ◽

Test Method ◽

Soil Thickness ◽

In Situ Test ◽

Factors Affecting ◽

Reclaimed Soil ◽

Different Thickness

Reclaimed soil is the key substrate for land reclamation and ecological restoration in the mine areas. The change of the density of reclaimed soil of the nonmetallic mines in Xinjiang during the land reclamation process was studied in this paper. Firstly, the in situ test method of static load was used to simulate the compaction of reclaimed soil with different thickness of overlying soil by different compaction times of mines reclamation machinery, and field in situ test compaction data were obtained. Then, the numerical simulation method was used to simulate the variation process of displacement and porosity at different depths for different thickness of the reclaimed soil under different compaction conditions. The numerical simulation and the in situ test results verified each other to acquire the compaction process and results of reclaimed soil under different compaction. The results showed that the numerical simulation results were consistent with the in situ test. The reclaimed soil thickness and compaction times were crucial factors affecting the compaction effect of the soil. The difference between the three times compaction and the uncompacted soil was obvious, and the effect of single compaction was weakened with the increase of compaction times. Under the same compaction action, the thicker the soil was, the less obvious the compaction effect would be. In the process of reclamation, the compaction effect of the surface part (at the depth of 10 cm) was visible, and the amount of compression and springback was larger. The research results can provide a reference to the land reclamation of nonmetallic mines in Xinjiang, China.

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In Situ Test Research on Friction Resistance of Self-Anchored Test Pile

Advances in Civil Engineering ◽

10.1155/2021/1785727 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Chi Chen ◽

Hailong Ma ◽

Bilian Yang

Keyword(s):

Transfer Process ◽

Load Transfer ◽

Test Method ◽

Hyperbolic Function ◽

Function Model ◽

In Situ Test ◽

Testing Method ◽

Pile Testing ◽

Test Pile

The traditional static load test method has been considered as the most direct and reliable method to determine the bearing capacity of single pile, but it has some disadvantages, such as inconvenient operation, laborious test, high cost, and being time-consuming. In this paper, a new type of pile testing method, self-anchored pile testing method, was proposed, and the in situ test was carried out for the first time. This method allows the upper and lower piles to provide force to each other and does not occupy other construction spaces. It had the advantages of simple operation and being economical and practical. Based on the Q-w curve, axial force distribution curve, and hyperbolic function model of load transfer, this paper studied the evolution law of friction of self-anchored test pile and the load transfer process of self-anchored test pile. The results show that the load transfer process of self-anchored pile-soil interface can be divided into three stages: elastic, elastic-plastic, and limit state. The friction of the upper and lower piles starts from the bottom of each pile and then gradually increases. The soil around the upper and lower piles gradually undergoes nonlinear deformation and shear failure, and the pile soil reaches the yield state. By analyzing the hyperbolic function model of load transfer, it shows that the hyperbolic function model can be better applied to the self-anchored test pile, which has reference value for the selection of the function model of self-anchored test pile in the future.

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