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The noise is an essential ecological problem for ventilation shafts. For the time being, mine administrations have reacted to the complaints of the population with palliative measures. These measures usually included a noise barrier (timber-metal structure) positioned in front of the ventilator or air vent. A radical structural intervention taking into account all components of the ventilation block is necessary for the solution of the problem. The structural solution should meet a number of criteria for adequate ...

The construction boom along the Black Sea coast in Bulgaria made the contractors to seek sites near to precipices and landslide areas. Under these extreme geotechnical conditions, the construction has three basic aspects: 1/ Stability of slopes should be durably guaranteed; 2/ The connection between the leisure zone and the sea should be optimally designed, and 3/ The safety of people at the beach should be secured. A complex structural approach is necessary in order for the problems to be solved. It should includ...