In rock mechanics, what is the difference between uniaxial saturation compressive strength and uniax

In rock mechanics, uniaxial saturation compressive strength.

Difference between uniaxial compressive strength and uniaxial compressive strength:

1.The definitions of the two are different:

Compressive strength refers to the strength limit when the external force is the pressure.

Uniaxial saturated compressive strength is the compressive strength of materials with different properties in different aqueous states in accordance with the standard regulations, so that the specimen can reach the saturated aqueous state.

2.The difference between the two applications:

Compressive strength: usually in centimeters per square centimeter.

How many kilograms, or how many pounds per square inch. It refers to the stress required to pressurize the rock to fracture. The most important part of the strength test is the test of compressive strength.

Ultimate compressive strength: This is usually done in a stationary laboratory and the test specimen is crushed using a special hydraulic press with a power of more than 100 to 100 tons.

3.The formula for calculating the two is different:

Compressive strength: p p a p is the compressive strength, measured in pounds per square inch (psi), how many kilograms per square centimeter, p is the pressure, in pounds, kilograms, a is the section area, in square centimeters, square inches.

Uniaxial compressive strength:

r = f a, denoted by r, in pascals. where: f is the total pressure (NN) when the specimen is crushed; a is the area of the specimen.

The water content of the specimen is not the same, the general uniaxial compressive strength specimen is the natural water state, and the saturated compressive strength specimen is in accordance with the standard provisions, so that the specimen reaches the saturated water state, and the compressive strength of materials with different properties is different in different water content states.

Literally, it is a compressive strength test, and it may be in a different state, saturated, natural, and dry state.

Summary. The difference between natural and saturated compressive strength: For the same rock, the natural uniaxial compressive strength is higher than the saturated compressive strength, but the mass of the single rock block is not excluded.

If there is a weathering fracture development, it is not necessarily that the natural uniaxial compressive strength is higher than the saturated compressive strength, so the specific data to make a specific comparison, to see the problem should also be comprehensive, point and surface combination, in order to see the essence of the problem.

Uniaxial compressive strength of rocks The difference between "saturated" and "natural".

The difference between natural and saturated compressive strength: For the same rock, the natural uniaxial compressive strength is higher than the saturated compressive strength, but the source does not exclude the mass of the single rock block. If the hail slag has weathering cracks, it is not necessarily that the natural uniaxial compressive strength is higher than the saturated compressive strength, so the specific data are vertically compared and the problem should be comprehensively seen, and the essence of the problem can be seen by combining points and surfaces.

Rocks have softening coefficients, and the softening coefficient of rocks is the ratio of the unidirectional compressive strength of the rock specimen in the saturated state and the dry state (or in the natural water-bearing state). It is one of the indicators to judge the weathering resistance and water flooding resistance of rocks.

When the softening coefficient of the rock is equal to or less, it should be set as softened rock, otherwise, it is not softened rock. Rocks are solid minerals or mixtures of minerals, among which the rocks under the sea surface are called reefs, reefs and sands, which are composed of one or more minerals and have a certain structural structure, and there are also a few remains or relics (i.e., fossils) containing living organisms.

Summary. Hello, I am glad to answer for you, after querying the information, the rock with a uniaxial saturated compressive strength greater than 60 MPa is called "hard rock", 3060 MPa is called "harder rock", and less than 30 MPa is called "soft rock".

In addition to the compressive strength index of rock, a series of natural factors such as rock genesis, lithology, occurrence, fracture development degree and weathering degree should also be considered.

In the engineering geology research of rocks, due to the poor mechanical strength and solidity of soft rock, it often becomes the focus of engineering geology research in bedrock areas, and hard rock is softer than hard rock.

Hope the above helped, thanks.

The standard value of saturated uniaxial compressive strength of hard rock is greater than 60 mPa.

Hello, I'm glad to answer for you, I'm answering this question for you, you need to wait patiently for about three minutes, please don't worry.

Hello, I am glad to answer for you, after querying the information, the rock with a uniaxial saturated compressive strength greater than 60 MPa is called "hard rock", 3060 MPa is called "harder rock", and less than 30 MPa is called "soft rock". In addition to the early age index of rock compressive strength, a series of natural factors such as the genesis, lithology, occurrence, fracture development degree and weathering degree of rock should also be considered. In the engineering geology research of rocks, due to the poor mechanical strength and solidity of the soft continental rocks, it often becomes the focus of engineering geology research in bedrock areas, and the hard rocks are more hard and soft rocks.

I hope the above helps, thank you.

with density, gross bulk density andPorosityIncluding (opening and closing porosity).

The maximum compressive stress that a rock mass can withstand in a three-way compressive state is called the triaxial compressive strength of the rock mass.

The triaxial compression test of in-situ rock mass is beneficial to better evaluate the anisotropy of rock mass.

The maximum shear stress that can be resisted by a section in any direction of the rock mass under any normal compressive stress is called the shear strength of the section in that direction of the rock mass under the normal stress.

Uniaxial compressive strength refers to the load that a rock specimen can bear per unit area when it is compressed to failure in one direction.

Abbreviated as compressive strength. According to the measurement of the standard specimen in the water-containing state, there are dry compressive strength, natural compressive strength and saturated compressive strength.

Measurement: The uniaxial compressive strength of the rock refers to the ultimate failure strength obtained when the sample is only compressed in one direction, that is, the rock sample is placed between the upper and lower pressure plates of the press for pressurization, until the pressure intensity of the dust cavity is measured when the sample is crushed. The determination is generally carried out using a uniaxial compressive strength instrument, of course, a triaxial instrument can also be used as a uniaxial instrument.

Factors related to the triaxial compressive strength of rocks: There are many factors that affect the compressive strength of rocks, and the most important factors are three factors: structure, properties of cementation, direction of pressure, etc.

In terms of the size of crystalline particles, the compressive strength of some fine-grained rocks or cryptocrystalline rocks is often greater than that of coarse-grained rocks. For example, the compressive strength of fine-grained sandstone, if coarse, is greater than that of coarse-grained. In the case of igneous rocks and metamorphic rocks, some of the crystals are strongly bonded to each other, and their compressive strength is naturally greater than that of some poorly bonded rocks.

Rock triaxial laughing oak compressive strength.

It is one of the physical and mechanical properties of rocks. It refers to the maximum axial stress that the rock specimen can resist under the action of three-way compressive stress. The ordinary triaxial compressive strength of rock is determined by a special rock triaxial stress testing machine.

The rock mechanics problems encountered in mining engineering, such as slope stability, stope pillar bearing capacity and its stress-strain state, roadway stability, and stress state of stope empty area, are all two-way or three-way stress problems. Therefore, it is of practical significance to study the three-way stress of rock theoretically to solve the practical problems in mining engineering.

First, the mean, standard deviation and coefficient of variation of the test results were calculated, and then the standard value of the saturated uniaxial compressive strength of the rock was calculated according to Appendix J of the National Foundation Design Code (GB50007-2002).

Article 1 of the Appendix.

The specimen can be used in the core of the borehole or pit, and the rock block taken in the trenching.

Article 1 of the Appendix. The size of the rock sample is generally 50mm 100mm, and the number should not be less than six, and the saturation treatment is carried out.

Article 1 of the Appendix. Load on the press at a loading rate of 500-800kpa per second until the specimen is broken, note the maximum load, and describe the specimen before and after the test.

Article 1 of the Appendix. According to the test value of a group of samples participating in the statistics, the mean, standard deviation and coefficient of variation are calculated, and the standard value of the saturated uniaxial compressive strength of the rock is as:

frk=ψ.frm

where FRM --- mean value of saturated uniaxial compressive strength of rock;

FRK --- standard value of saturated uniaxial compressive strength of rock;

--Statistical correction factor;

n--- number of samples;

--Coefficient.

Summary. Hello, dear <>

The uniaxial saturated compressive ultimate strength of a rock refers to the maximum compressive strength of a rock after uniaxial loading in a saturated state. Representative rocks refer to rocks that are widely distributed in a certain area, have typical lithology, and represent the rock characteristics of the area. In the actual construction, the uniaxial saturated compressive ultimate strength of rock and the role of representative rocks are as follows

1.Engineering design: The uniaxial saturated compressive strength of rock and representative rock can be used as the basis for engineering design, which is used to evaluate the stability of rock mass and determine the support measures to be taken, and is also the basis for determining large-scale rock engineering such as tunnels, forts, dams, power stations and reservoirs.

2.Construction technology: The uniaxial saturated compressive strength of the rock and the representative rock can be used to determine the reasonable parameters of blasting, select the appropriate rubble direction, and reasonably select the excavation method.

Measurements of the uniaxial saturated compressive strength of rocks and representative rocks should be included in the engineering dossier as reference materials for rock properties and process conditions for future design and maintenance and repair. In short, the uniaxial saturated compressive ultimate strength of rock and representative rock have an important position and role in actual construction, which can become important parameters and basic data for judging rock stability, designing rock mass support measures and excavation technology, optimizing engineering design schemes, and incorporating them into engineering files.

The uniaxial saturated compressive ultimate strength of rock and what is the role of representative rock in actual construction.

The uniaxial saturated compressive ultimate strength of rock and what is the role of representative rock in actual construction.

Hello, dear <>

The uniaxial saturated compressive ultimate strength of a rock refers to the maximum compressive strength of a rock after uniaxial loading in a saturated state. Representative rocks refer to rocks that are widely distributed in a certain area, have typical lithology, and represent the rock characteristics of the area. In the actual construction, the uniaxial saturated compressive ultimate strength of rock and the role of representative rocks are as follows

1.Engineering design: The uniaxial saturated compressive strength of rock and representative rock can be used as the basis for engineering design, which is used to evaluate the stability of rock mass and determine the support measures to be taken, and is also the basis for determining large-scale rock engineering such as tunnels, forts, dams, power stations and reservoirs.

2.Construction technology: The uniaxial saturated compressive strength of the rock and the representative rock can be used to determine the reasonable parameters of blasting, select the appropriate rubble direction, and reasonably select the excavation method.

Measurements of the uniaxial saturated compressive strength of rocks and representative rocks should be included in the engineering dossier as reference materials for rock properties and process conditions for future design and maintenance and repair. In short, the uniaxial saturated compressive ultimate strength of rock and representative rock have an important position and role in actual construction, which can become important parameters and basic data for judging rock stability, designing rock mass support measures and excavation technology, optimizing engineering design schemes, and incorporating them into engineering files.

Summary. The uniaxial compressive strength of a rock refers to the large compressive stress that a rock sample is subjected to per unit area when it is subjected to one-way compression to failure.

What is the natural uniaxial compressive strength of rocks? Saturated uniaxial compressive strength of rocks Whether the saturated state is using the vacuum method or the boiling method.

The uniaxial compressive strength of a rock refers to the large compressive stress that a rock sample is subjected to per unit area when it is subjected to one-way compression to failure.

The saturated state of the uniaxial compressive strength of the rock is the use of the boiling method, the water surface in the boiling vessel is always higher than the sample, and the boiling time is not less than 6 hours.