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Normally Consolidated Clays: For normally consolidated clays, "a" is usually close to 1, and "b" is close to 0. This indicates that changes in effective stress have a relatively direct and immediate effect on pore water pressure.
Overconsolidated Clays: In overconsolidated clays, "a" is generally less than 1, and "b" is greater than 0. This suggests that overconsolidated clays are less compressible and more resistant to changes in pore water pressure compared to normally consolidated clays.
Loose Sands: For loose sands, "a" is often close to 0, and "b" is close to 1. This indicates that changes in effective stress have a relatively direct and immediate effect on pore water pressure in loose sands.
Dense Sands: In dense sands, "a" is greater than 0, and "b" is generally less than 1. This means that dense sands are less compressible and less sensitive to changes in pore water pressure compared to loose sands.
Sivanta Foundations
Wiki User
∙ 11y agoSkempton's pore pressure parameters A and B are used to check the saturation of the sample. As when the sample is fully saturated if we increase the cell pressure there will be same amount of increment in the pore pressure too. The reason behind this is that the system acts more like a confined bulb . Similarly the parameter A gives the change in the pore pressure as we increase the deviatoric stress
Δu3=BΔσ3
Δud=AΔσd
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What is the normal water pressure before the pressure reduction valve?
There is no such thing as normal water pressure, it is changing all the time due to demand in the water distribution system. If a PRV is needed then the pressure is higher upstream than is wanted.
Would you expect the suction in the soil to be 0 at any time?
Soil suction is zero at the phreatic surface. This is the point where the pore water pressure is equal to the pore air pressure. Above this surface pore water pressure becomes increasingly negative compared to pore air pressure and as such matric suctions develop. Below the phreatic surface the pore water pressure becomes increasingly positive and the pore spaces are totally saturated.
Abnormal load on an earth dam is?
The abnormal load on the earth dam is the water pressure on the upstream side.Loads acting on dams are hydrostatic pressure, self weight, seismic loads.
Advantages of Steel versus concrete tanks?
Concrete water tank has rough surface so collects dirt and bacteria.It's base line cracks result in water contamination. And flat bottom will not allow complete drainage of hose pressure water with chemicals resulting in contamination of incoming water.So chlorine causes degradation of the tank surface that provides room for bacteria growth.
Do you need to apply a waterproofing agent like Tuff n Dri to a below grade retaining wall if 5000 psi concrete is used?
the 5,000 psi is the amount of pressure the concrete can withstand before it will crush. it has nothing to do with water proofing. to find out if you need water proofing you need to know how poores the concrete is and how quickly the ground out side will drain water. it only takes about 6 psi for water to penatrate most concrete walls, it is more a matter how long the water is alowed to stay against the wall, there for how far through the concrete it can penatrate if you have a good working drain you will most likely never need water proofing. but if you dont own a backhoe it is far cheaper to put it on the outside before the hole is filled.
Which parameter is not change when sound is goes air to water?
Speed is that parameter which doesn't change.
What is quality parameter?
A quality parameter is a measuring device used to measure rivers, lakes, and ground water. This device can measure the way these bodies of water change.
What is the mass of 1.0 milliliter of water?
If the water is pure, and the temperature and pressure are both at standard values,then the mass of one milliliter of water is 1 gram.
What is a derivative control?
Derivative control applied in control engineering, usually for the operation of control valves and its importance came during valve tuning. Derivative control is popularly known as anticipatory control. ( controller starts its control action, by anticipating the trend of present value (PV) of parameter.) Derivative control anticipates parameter values and and it will take control action to control the parameter with in set point. Eg: In a water heating system, water temperature is controlled by controlling steam valve opening. Let set point for water is 80°C, and derivative control will check the status of water temperature and if it is slowly increasing range ( may be due to some load change), controller will starts to control temperature by slowly closing steam valve. ( and vice versa) Actually this type control action just observe at control parameter values and initiates control action.
Is a static pressure of 1.5 high and what could you compare it to the Eg. pressure in a balloon?
The static pressure you mentioned as 1.5 is basically in 1.5 inch water guage . (i.e measured on a water guage at which the height of the water column is 1.5 inch) So if u want to compare ur static pressure to that of a balloon, you will need to find the static pressure of the balloon to compare both the values.
What is the relationship between pressure and distance in the ocean?
Water pressure can be calculated easily if you know the simple steps on how to calculate water pressure. Water pressure is also called as hydrostatic pressure and is calculated for the non-moving fluid. It can be calculated for any amount of large water body. You can easily calculate water pressure using simple equation.Formula for calculating water pressure:P = a + l × g × hIn the above formula,"P" is the water pressure"a" is the atmospheric pressure at the surface of water"l" is the density of water"g" is the gravitational acceleration"h" is the depth of waterTo calculate water pressure you need to know the depth of water, atmospheric pressure at the surface of water, density of water and gravitational acceleration.We generally use the standard values of gravitational acceleration (g) and density of water (l). Standard value of density of water is 1000 kg/m3 and standard value of earth's gravitational acceleration is 9.8 m/s2.Determine the depth at which you want to calculate the water pressure, substitute it in the place of "h" in the above formula.Determine the pressure at the surface of water. You need to use the barometer for measuring the pressure of water, substitute this in the place of "a" in the above formula. The pressure at the surface of water should be expressed in kg/ms2. You can use help of online sources to convert into desired units.Substitute all the measured values in the above equation and calculate the pressure of water.Multiply the result obtained by 0.014. This will convert the value in pounds per square inch.This is the calculated water pressure or hydrostatic pressure.Calculating water pressure in a pipe:Water pressure in a pipe is basically weight of the water above the point where you want to calculate the water pressure. To calculate water pressure within a pipe you need to know the vertical difference in the water level between the pipe and the water surface. This distance can be either vertical distance or horizontal distance, doesn't matter.Steps for calculating water pressure within a pipe:Step 1: Locate the nearest surface of water from where the water reaches your source. This surface can be anything from a water tower, water tank, lake or a sea.Step 2: Calculate the elevation of this water surface from your source. You need proper measuring instruments for this. If the water surface is a water tank, then you need to include the height of the tower in your calculation.Step 3: Find out the measurement of the elevation where your water source is located or the distance of the outlet of the pipe from the ground level.Step 4: If this pipe is located underground then subtract the distance of the pipe from the ground surface.Step 5: Finally subtract the measurement of the elevation of your pipe from the measured elevation of the water surface.Step 6: You will get the value of water pressure in feet head if you have measured the distances in feet or meter head if you have measured the distances in meter. This value needs to be converted into appropriate units of pressure.Step 7: Using online resources convert the above measured values into appropriate units of pressure by entering the values you calculated into the text boxes and clicking on the calculate button. As most of the online converters convert pounds square inches to the units of pressure, multiply the value in feet head by 0.433 and meter head in 1.4202 to convert them into PSI units.
How does viscosity of water vary with pressure?
As with pretty much all liquids, the viscosity of water at a constant temperature increases with increasing pressure. Since the pressure squeezes the molecules closer together this is to be expected. See the related link below for some actual values for this phenomenon.
What can water pressure do?
pressure water into doing stuff
What temperature does water melt?
== == Pressure has an effect on the freezing point of water, though it isn't as substantial as the effect of pressure on boiling point. We could say that these values are at standard pressure, but realistically there is no noticeable difference of water's freezing point on various altitudes on earth. But it should be noted that if there are ions dissolved in the water, the freezing point will drop significantly due to the added solute. The melting point of water is the same as the freezing point of water; 32 degrees Fahrenheit or 0 degrees Celsius.
What is Density of water at 15 c?
Various publications give the density of pure water at 15oC between 0.9991026 and 0.999099 grams per cubic centimeter at 1 atmosphere pressure. One of the most commonly accepted values is 0.9991016 g/cm3 with atmospheric pressure at 101325 Pascals.
Is hot water pressure and cold water pressure equal in pressure?
Pressure is the same whether hot or cold.
Does deep sea have high air pressure or high water pressure?
High water pressure.
