How to find 30 for dry weight, how to find for dry weight

Dry weight = the ratio of the weight of the particles in the soil to the volume of the soil.

In general, the dry gravity increases with the duration of sedimentation and gradually tends to a stable value, but the time to stabilize varies greatly.

The dry weight of coarse-grained model sand tends to be stable, and the initial dry weight is close to the stable dry weight. However, it takes much longer for the dry weight of fine-grained model sand to reach stability.

Dry weight as a function of particle size.

The finer the particle size of the model sand, the smaller the dry weight, and the greater the variation, on the contrary, the larger the dry weight of the sediment, the smaller the variation. Bakelite powder and pulverized coal both increased with the increase of particle size, and the dry weight increased significantly, and the reason for the above-mentioned regular changes was the model sand with finer particle size.

In the sedimentation process, there is a honeycomb structure between the particles, the porosity is larger, so the dry weight is smaller, and there is a greater compressibility With the increase of the upper pressure and the extension of the siltation duration, the pore water is gradually discharged, so the change range of dry weight is larger For the coarser model sand, there is basically no honeycomb structure, or the amount is very small, so its dry weight is larger, and the compressibility after siltation is smaller, and it is easier to tend to be stable, so the variation range of dry weight is smaller.

**Question] Soil buoyancy weight 1110 Soil gravity (general meaning soil weight), saturation weight, dry weight and effective weight (weighing buoyancy weight) respectively indicate the unit volume of soil, saturated, dry, wet state weight reflects the difference in soil quality in the same state General soil is composed of three phases (gas, liquid, solid) group: air, water and soil weight moisture content condition soil weight is equal to the total weight of soil (= air + water + soil particles) total volume of soil removal; Saturation of the soil pores should be full of water (or water level to take soil), that is, saturation (total weight of soil = water + soil particles); the ratio of the weight of the solid phase (soil particles) of dry weight soil to the total volume of soil; The weight of the soil is deducted from the buoyancy of the water and soil particles by the water buoyancy, which is equal to the total volume of the soil weight deducted from the buoyancy of the soil particles: saturation weight, "gravity", "dry weight", and the calculation formula of the effective weight (or buoyancy weight):

Efficacy Gravity = (Total Soil Weight - Soil Particle Volume * Water Weight) Total Soil Volume = Saturation Gravity - Water Gravity (take 10kn m3) How to calculate the efficiency severity of the general quality exploration report to the severe unsaturated gravity According to the report soil three-phase index (water content, phase density density) to find the satiety gravity to calculate the efficiency of the soil gravity Soil gravity is generally 17 20 kn m3 (the water content should be low and high), because the saturation is equal to the severity of the floating weight conservatively take 11 kn m3

Definition: The ratio of solid particles to volume in soil. It is also possible to calculate the wet density of the unearthed first and divide it by (1+W), where W is the moisture content.

The ratio of solid particles to volume in soil. It is often used to indicate the degree of compaction, with the higher the dry density, the greater the degree of compaction.

Soil gravity generally includes natural gravity, saturated gravity, dry gravity and effective gravity (also known as floating weight). The weight of soil per unit volume in natural, saturated, dry and wet states is expressed, reflecting the difference in the quality of soil in different states.

1. Natural gravity is the gravity of the soil under the condition of natural moisture content, which is equal to the total weight of the soil (= air + water + soil particles) divided by the total volume of soil;

2. Saturation gravity is when the soil pores are all filled with water (or taken from below the groundwater level), the corresponding natural gravity is saturation gravity (at this time, the total weight of soil = water + soil particles);

3. Dry weight is the ratio of the solid weight of the soil to the total volume of the soil; The effective gravity is when the soil is immersed in water, the soil particles are affected by the buoyancy of the water, and the weight of the soil needs to be deducted from the buoyancy, which is equal to the weight of the soil particles after deducting the buoyancy divided by the total volume of the soil.

4. Effective gravity (or floating weight). Calculation formula: effective gravity = (total weight of soil - volume of soil particles * water weight) total volume of soil = saturation weight - water weight (take 10kn m3).

Heavy density indicates the mass of a substance per unit volume, and the unit in the International System of Units is kg m3; Severity is the weight per unit volume of a substance, and the unit in the International System of Units is n m3; The relationship between gravity and density is: gravity = acceleration due to gravity g(10) density (g cm3); The density is also called severity, the density of water is 1000g cm3, the effective weight (density) of soil, the effective weight of silty clay, can generally be taken according to the results of geotechnical tests (between), internal friction angle (5 8), cohesion (about 15). References:

The empirical value can refer to the "Engineering Geology Handbook" Heavy is also known as bulk density and volume weight. The gravity of the soil usually refers to the natural gravity of the soil, that is, the gravity of the soil particles in the unit volume, if the soil layer is not located under the groundwater and is not affected by the buoyancy of the action, the gravity of the soil is the effective gravity, if the soil layer is located below the groundwater, due to the buoyancy of the water, the gravity of the soil particles in the unit volume after deducting the buoyancy is called the effective gravity of the soil, which is the product of the effective density of the soil and the acceleration of gravity. If the self-weight stress of the soil is calculated, the effective gravity should be used.

For general soil, the common variation range is the self-weight stress of the soil per cubic meter of soil is the stress caused by the effective gravity of the soil itself. For the soil layer located below the groundwater level, due to the buoyancy of the water, the intergranular stress is affected by gravity and buoyancy, so the effective gravity of the soil at this time is the effect of the gravity of the soil particles minus the buoyancy, that is, the effective gravity stress of the soil should be calculated at this time. In the case of Shanghai, the natural severity is between 17-19, while after deducting buoyancy, the effective severity is only 7-9.

The gravity of soil refers to the gravity of the materials that make up the soil, which is produced by the gravitational pull of the earth. Soil is mainly composed of particles, water and gas, and the gravity of soil is also the sum of these three weights. The effective gravity of the soil refers to the soil if it is under the water table, due to the action of water buoyancy.

Volume divided by the compaction complex coefficient multiplied by the dry density system. The following heaviness is given as a reference (miscellaneous fill weight 17kn m cubic meter).

Silty clay 19, silt only clay ) general foundation and soil average value take 20.

Discipline: Engineering Geology.

Title: Soil gravity.

English: unit weight of soil Interpretation: Soil weight used to be called soil bulk density, which is the gravity of a unit volume of soil. According to the degree of water filling in the soil pores and the position of the soil, it can be divided into natural gravity, dry gravity, saturation gravity, etc.

Effective gravity = buoyancy weight, which is the ratio of the weight of the solid phase after deducting the buoyancy force to the total volume of the soil.

Buoyancy = buoyancy density (effective density) x gravitational acceleration (g).

This requires formula calculation, simple operation, fast measurement speed, high accuracy, low cost and other advantages, is the traditional oven method and the traditional portable moisture meter alternative products.

1. Set the volume of soil particles.

1, then the mass of the soil particles is. If the severity is 20, the density is 2.

2. Then set the special mass of water as x, because the density of water is 1, so the volume of water is also x, according to the density of the soil is 2, the column equation obtains: (, solve the equation to obtain x = ,.

3. Dry density =

γ=ρg。

Bulk density is also known as severity. Indicates the gravitational properties of an object due to the gravitational pull of the Earth, and in the case of homogeneous fluids, the gravitational force acting on a unit volume. The unit is: cattle cubic meters or thousand cattle cubic meters.

The mass possessed per unit volume is called density, and the formula = m v (kg m3); The weight possessed per unit volume is called bulk density, the formula = g v(n m3) and the bulk density is equal to the product of density and acceleration due to gravity, i.e., = g.

Distinction:

Bulk density also indicates the gravitational properties exhibited by an object due to the gravitational pull of the earth, and in the case of homogeneous fluids, bulk density also refers to the gravitational force acting on a unit volume. Textbooks often use the Greek alphabet (pronounced gamma). In the International System of Units, its units are:

1,000 new tons of cubic meters (kn m3) (for example, the density of air at 0 degrees Celsius and the absolute standard index is kilogram cubic meters, that is, grams of cubic centimeters, and the bulk density of air in the corresponding state is Newton cubic centimeters).

Calculation method of bulk density:

The mass possessed per unit volume is called density, and the formula = m v (kg m3); The weight possessed per unit volume is called bulk density, the formula = g v(n m3) and the bulk density is equal to the product of density and acceleration due to gravity, i.e., = g.

Soil dry bulk density = soil dry density*; Soil dry density = soil particle quality Total volume of soil or soil dry density = natural density (1 + natural water content).

There are many methods to determine the bulk density of soil, focusing on the ring knife method

Instruments: ring knife (volume of 100 cm3), balance (inductance grams and grams), oven, ring knife holder, sharpening knife, small shovel, aluminum box, wire saw, dryer, etc.

The bulk density of the soil indicates the compactness of the soil, the larger the bulk density, the greater the compactness, and the bulk density is also related to the soil quality.

I guess it's the dry density*.