Get Effect Of Pore Pressure Build-up On The Seismic ... - D'appolonia - Dappolonia

Increased pore pressure decreases effective stress, leading to fracture failure. Decreasing pore pressure increases effective stress, which can produce crushing.

The Role of Excess Pore-Water Pressure A founding principle of slope stability is that a rise in pore-water pressure reduces the shear strength of the soil (Skempton, 1960).

It is affected by the soil type, water flow conditions and level of the water table. Pore pressure is important in geotechnical engineering as it influences soil behaviour, including its shear strength.

During an earthquake, the excess pore water pressure of saturated loess rises due to seismic loading, which leads to slope failure.

The results show that the rock fragments obstruct water flow on the slope and increase the pore water pressure. However, higher pore water pressure can cause the slope to become less stable. These indicate that the safety factor for the slope with rock fragment is lower than slope without the rock fragment.

The variation of pore water pressure in earthen dams plays an important role in maintaining its stability. The pore water pressure within the dam are altered by the external loading conditions like rapid drawdown of reservoir water, earthquake loading and raise of water table caused by infiltration of rainfall.

A rise in pore-water pressure occurs when the saturated soil is stressed and when the porosity cannot increase or the pore fluid cannot expand or escape through fractures.

Increased pore pressure decreases effective stress, leading to fracture failure. Decreasing pore pressure increases effective stress, which can produce crushing.