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Earthquake Analysis According to JTJ 004-89

Earthquake effects are in stability analysis represented by horizontal and vertical forces acting at the centers of gravity of individual soil blocks. Magnitude of these forces is related to the weight of soil blocks and is calculated using horizontal and vertical earthquake coefficients. Horizontal earthquake force is always oriented out form the slope massif. Vertical force can be directed upwards or downwards, the orientation is defined by the sign of the force.

Horizontal earthquake force Ehs is given by formula:

and vertical earthquake force Evs is determined by:

where:

Ci

-

importance coefficient for seismic design

Cz

-

comprehensive influence factor

C0

-

meeting coefficient related to the influence of horizontal seismic effect

Kh

-

coefficient of horizontal seismic acceleration

Kv

-

coefficient of vertical seismic acceleration

Gs

-

weight of the soil block