TY JOUR TI THEORETICAL AND EXPERIMENTAL SUBSTANTIATION FOR EFFORT CHANGES IN SUPPORTS OF BOOM SELF-PROPELLED CRANE KW boom self-propelled crane KW weak load-bearing soils KW modeling KW efforts KW support subsidence KW stability JO Bulletin of Bryansk state technical university AU Grigor'ev, P.A. AU Sladkova, L.A. AU Krylov, V.V. PY 2020 IS 2020 PB Bryansk State Technical University