What is RU geotechnical?

The Ru ratio is a crude way of describing pore-water conditions in a slope stability analysis. A single Ru value can seldom, if ever, represent the actual field groundwater flow conditions. Although it is rarely used in practice, Ru remains an option in SLOPE/W for legacy reasons.

What is a piezometric line?

Piezo Lines can be used for calculating pore pressure when the Groundwater Method in Project Settings is set to Water Surfaces. A Piezometric Line in Slide2 can represent an actual Piezometric surface obtained from piezometer measurements, for example. You will now see the Assign Piezo Line dialog.

How do you calculate pore water pressure ratio?

Labortaory or field tests may be used to quantify the excess pore water pressure. For excess pore water pressure ratio (ru, where ru = Δu/ σ’; Δu = excess pore pressure and σ’ = initial effective confining pressure) value of 0.9 or greater, liquefaction is expected.

What is Geostudio slope W?

SLOPE/W is the leading slope stability software for soil and rock slopes. SLOPE/W can effectively analyze both simple and complex problems for a variety of slip surface shapes, pore-water pressure conditions, soil properties, and loading conditions.

What is pore pressure ratio?

The pore pressure ratio Ru has been used for many years as a parameter to represent the global pore water pressure condition in a slope stability analysis. Today, the use of computer programs has often removed the need for chart-based or coefficient-based methods of slope stability analysis using Ru.

What is negative pore water pressure?

Negative pore water pressure is due to the capillarity action of water in the soil. When the water in the soil is below the ground level, some parts of soil above water level gets saturated due to capillary rise. In this part of soil water is in tension whereas below the water table it is in compression.

What is piezometric head formula?

Determining Piezometric Head in Groundwater Piezometric total head calculations in groundwater use the formula h=z+Ψ where h means total head or height of the groundwater level above the datum, usually sea level, while z represents the elevation head and Ψ represents the pressure head.

What is the difference between piezometric surface and water table?

Piezometric Surface. The distinction between the water table and the piezometric, also known as potentiometric, surface is the difference between the naturally occurring surface of water in a groundwater aquifer and the surface of water in a monitoring well in a confined aquifer.

What is excess pore water pressure?

Excess pore water pressure in the consolidation process is defined in two different ways: excess pore pressure is the excess over the hydrostatic pressure; excess pore water pressure is the pore pressure in excess of a steady-state flow condition.

What is a piezometric well?

Many piezometer wells are drilled within a confined aquifer at certain locations. The piezometric surface of water is the level of water within a piezometric well in a confined aquifer. It is depicted on maps as a line between the walls of a well.

What is the difference between the water table and piezometric surface?

The distinction between the water table and the piezometric, also known as potentiometric, surface is the difference between the naturally occurring surface of water in a groundwater aquifer and the surface of water in a monitoring well in a confined aquifer.

What is a piezometer in geology?

Piezometric Surface. A piezometer is a special tool that is used to take measurements within an aquifer. It is submerged within a well beneath the saturated zone, through less porous rock. Many piezometer wells are drilled within a confined aquifer at certain locations.

How does jet grouting affect the piezometric level?

Readings of the piezometric level during the jet grouting trial are shown in Fig. 5.12. This figure shows that the process of jet grouting caused a large increase in piezometric level in piezometer P3 located immediately in front of the jet grout area. The maximum increase of piezometric level was 7 m.