Stability of a slope can be affected by seismicity in two ways: earthquake and blasting. These seismic motions are capable of inducing large destabilizing inertial forces.
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Types of seismic wave
Typical ways: earthquake and blasting. These seismic motions are capable of inducing large destabilizing inertial forces. seismogram ( www.geo.mtu.edu)
definition of earthquake terms (www.culcanhammer.net)
Dynamic Soil Properties ways: earthquake and blasting. These seismic motions are capable of inducing large destabilizing inertial forces.
Important elements in a seismic response analysis are:
static soil properties,
dynamic soil properties,
constitutive models of soil response to loading and
methods of analysis using computer programs.
there are two basic approaches to incorporate the seismic effect on slope stability
Inertia slope stability analysis
weakening slope stability analysis
Simulation of seismic effect
In pseudo-static methods, the cyclic earthquake motion is replaced with a constant horizontal acceleration equal to kc (g), where kc is the seismic coefficient, and g is the acceleration of gravity. A force is applied to the soil mass equal to the product of the acceleration and the weight of the soil mass.
Newmark replaced with a constant horizontal acceleration equal to ’s method assumes: existence of a well-defined slip surface, a rigid, perfectly plastic slide material, negligible loss of shear strength during shaking, and that permanent strains occur if the dynamic stress exceeds the shear resistance. Also, the slope is only presumed to deform in the downslope direction, thus implying infinite dynamic shear resistance in the upslope direction. The procedure requires that the value of a yield acceleration or critical seismic coefficient, ky, be determined for the potential failure surface using conventional limit equilibrium methods.
Inertia Slope Stability – Newmark Method
Pseudo-static approach replaced with a constant horizontal acceleration equal to