Research on the collaborative deformation law of mining surface and transmission line tower slab foundation
To ensure the safe operation of the transmission line tower in the mining area under mining in-fluence,the cooperative deformation law of the mining surface and the large slab foundation of the trans-mission line tower were investigated through theoretical analysis and numerical simulation.Taking the large slab foundation of a transmission line tower overlying a working surface as the research object,based on the failure patterns of the foundation,the mechanical model of the slab foundation was established.The collaborative deformation relationship between the ground surface and the foundation at the tensile(com-pression,neutral)zone was derived based on the probability integral method.Theoretical analysis indicated that the key parameters of foundation deformation due to mining could have foundation elastic modulus(Ej),soil Poisson's ratio(μ),foundation root opening(bt),soil elastic modulus(E),tower self-weight(P),and foundation section inertia(Iy).Foundation horizontal deformation εj expressed a neg-ative correlation with Ej and μ.Still,it expressed a positive correlation with surface horizontal deformationε,bt and E.Foundation tilt deformation ij expressed positive correlation with surface tilt deformation i,P and bt.Still,it behaved negative correlation with Ej and Iy.Numerical simulation demonstrated a decreasing sequence regarding horizontal foundation deformation at different zones,namely deformation value at the tensile zone was the highest,followed by the value at the compression zone and that at the neutral zone.
mining-induced surface deformationtransmission line towerslab foundationprobability integralcollaborative deformation
万方数据
维普
