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Earthquake Effect - Standard Analysis

The program allows us to compute the earthquake effects with the help of two variables - factor of horizontal acceleration K_h or the coefficient of vertical earthquake K_v.

Coefficient of vertical earthquake K_v

The coefficient of vertical earthquake either decreases (K_v > 0) or increases (K_v < 0) the unit weight of soil, water in soil, and material surcharge by multiplying the respective values by 1 - K_v. It is worth noting that the coefficient K_v may receive both positive and negative value and in case of a sufficiently large coefficient of horizontal acceleration the slope relieve (K_v > 0) is more unfavorable than the surcharge.

Factor of horizontal acceleration K_h

In a general case, the computation is carried out assuming a zero value of the factor K_h. This constant, however, can be exploited to simulate the effect of an earthquake by setting a non-zero value.  This value represents a ratio between horizontal and gravity accelerations. Increasing the factor K_h results in a corresponding decrease of the safety factor SF.

The coefficient of horizontal acceleration introduces into the analysis an additional horizontal force acting in the center of gravity of a respective block with the magnitude K_h*W_i, where W_i is the block overall weight including the material component of the slope surcharge.

The following table lists the values of the factor K_h that correspond to different degrees of earthquakes based on the M-C-S scale.