The practical calculation formulas for torsional vibration of embedded lump foundations were established based on the elastic half-space theory and state-of-the-art results of comprehensive experimental and numerical calculation by using equation equivalence method. Exerting impulsive load to embedded lump foundation of 0.5 m×0.5 m and 1.0 m×0.5 m with pendulum hammer to make foundations happen free torsional vibration in pit of 20 m×10 m×4 m respectively

collecting its vibration response

the results of experiment are compared to the results of calculation performed with practical calculation formulas. The advantages of the formulas are clear concept and simple calculation. It is practical for power equipment lumped foundation of arbitrarily shaped and arbitrarily embedded lumped foundations. It has referential significance to the calculation of seismic response of structural engineering.