ASSESSMENT OF THE EFFICIENCY OF THE VERTICAL BARRIER DESIGN IN THE FORM OF AN OPEN TRENCH WITH FASTENING OF WALLS TO REDUCE VIBRATIONS PROPAGATION IN THE GROUND ENVIRONMENT

The article considers the efficiency of using an open trench without filling, 1 m wide, with fastening of its walls for damping vibrations propagating in the soil environment from a point source of vibrodynamic effects. A mathematical model is formed based on the finite element method. For equal physical and mechanical properties of the soil, 3 calculation schemes are modeled: in the form of free propagation of vibrations in the soil environment without obstacles, in the form of an open trench with fastening of its walls by 2 clamped retaining slab walls and with additional fastening in the form of inclined anchor piles for a greater trench depth. According to the calculation results, it was revealed that the device of an open trench in the path of wave propagation with fastening of its walls ensures a decrease in the values of vertical amplitudes of soil surface vibrations behind it at a distance equal to two lengths of the surface wave. The greatest decrease in vibration amplitudes is noted directly behind the open trench at a distance equal to 15–30% of the length of the surface wave. It reaches 43% for the option of fastening the trench walls with vertical clamped retaining structures and 73% for the option of fastening the walls of an open trench of greater depth with additional inclined anchor piles.