sand loose coefficient

  • Permeability of Soils: Factors and Determination

    Allen Hazen showed that for loose uniform sands, permeability is given by the relation – k = C.D 10 2 …(9.5) where D 10 is the effective size of soil in centimeters (particle size corresponding to 10% cumulative finer) and C is a constant of proportionality (= 100 – 150).

  • Sand, loose volume to weight conversion

    About Sand, loose; 1 cubic meter of Sand, loose weighs 1 437 kilograms [kg] 1 cubic foot of Sand, loose weighs 89.70898 pounds [lbs] Sand, loose weighs 1.437 gram per cubic centimeter or 1 437 kilogram per cubic meter, i.e. density of sand, loose is equal to 1 437 kg/m³ Imperial or US customary measurement system, the density is equal to 89.709 pound per cubic foot [lb/ft³], or 0.83064 ...

  • Friction Coefficients

     · Static Friction Coefficients. The friction coefficients considered below are for static friction cases where two solid surfaces in contact with each other are resisting relative lateral motion. It should be noted that there can be significant differences between static friction (typically higher) and kinetic (sliding) friction ...

  • Soil classification

    SAND (and coarser) particles are visible to the naked eye. ... Uniformity coefficient C u = d 60 / d 10 Coefficient of gradation C k = d 30 ² / d 60 d 10. Both C u and C k will be 1 for a single-sized soil ... loose, medium dense, dense (use a pick or driven peg, or density index) Bedding structure

  • Coefficient of Earth Pressure at Rest

    Jaky 1944 considered a sand prism of loose granular soil, inclined at to the horizontal, and asserted that the stress on vertical plane OC, Fig. 1 b, is the pressure at rest. This in itself is a far reaching assumption. In the introductory portion of the paper

  • Rolling friction and rolling resistance

    car tire on solid sand, gravel loose worn, soil medium hard 0.2 - 0.4 car tire on loose sand Rolling Coefficients Cars The rolling coefficients for air filled tires on dry roads can be estimated . c = 0.005 + (1 / p) (0.01 + 0.0095 (v / 100)2) where c = rolling coefficient

  • Density of Sand Calculator

    Density of Sand: In general, Density can be defined as mass per unit volume/mean particles per unit volume. The sand density varies upon several factors and its conditions. A normal loose dry sand has the density of 1442 kg/m 3. Sand Density Formula: The ratio of mass of the sand to the volume of calibrating container gives you the density of sand.

  • Angle of repose

    The angle of repose, or critical angle of repose, of a granular material is the steepest angle of descent or dip relative to the horizontal plane to which a material can be piled without slumping. At this angle, the material on the slope face is on the verge of sliding. The angle of repose can range from 0° to 90°. The morphology of the material affects the angle of repose; smooth, rounded ...

  • Angle of friction

    Its definition is derived from the Mohr-Coulomb failure criterion and it is used to describe the friction shear resistance of soils together with the normal effective stress. In the stress plane of Shear stress-effective normal stress, the soil friction angle is the angle of inclination with respect to the horizontal axis of the Mohr-Coulomb ...

  • Rankine At-Rest, Ko Lateral Earth Pressure Parameters

     · LATERAL EARTH PRESSURE PARAMETERS Approx Total Density 140 pcf 140 pcf Approximate Friction Angle 15º - 20º 15 Ka, Ko, Kp Averages 20 30º - 35º 30 Ka, Ko, Kp Averages 35 Active Pressure Coefficient, Ka = (1-sinϕ) / (1+sinϕ) = 1/Kp 0.54 0.59 0.54 0.49 0.30 0.33 0.30 0.27 At-Rest Pressure Coefficient, Ko = (1-sinϕ) 0.70 0.74 0.70 0.66 0.46 0.50 0.46 0.43

  • Determination of Thermal Conductivity of Coarse and Fine ...

    four samples of sand. They are dry course sand, saturated course sand, dry fine sand, and saturated fine sand. Figure 3 and 4 showing sieve analysis result of two kinds of sand that used in this research. Soil parameter of first specimen (saturated coarse sand) is bulk = 17.58 kN/m 3 and γ dry = 20.70 kN/m 3. The second one (dry coarse sand) is γ

  • USCS Description Cohesion (kPa) Friction angle (°) Soil ...

    USCS Soil-class Description Cohesion (kPa) Friction angle (°) GW well-graded gravel, fine to coarse gravel 0 40 GP poorly graded gravel 0 38 GM silty gravel 0 36 GC clayey gravel 0 34 GM-GL silty gravel 0 35 GC-CL clayey gravel with many fines 3 29 SW well-graded sand, fine to coarse sand 0 38 SP poorly graded sand 0 36 SM silty sand 0 34

  • Soil permeability coefficient

    The soil permeability is a measure indicating the capacity of the soil or rock to allow fluids to pass through it. It is often represented by the permeability coefficient (k) through the Darcy''s equation: V=ki. Where v is the apparent fluid velocity through the medium i is the hydraulic gradient, and K is the coefficient …

  • Rolling Resistance

    The force that resists the motion of a body rolling on a surface is called the rolling resistance or the rolling friction.. The rolling resistance can be expressed by the generic equation. F r = c W (1). where . F r = rolling resistance or rolling friction (N, lb f). c = rolling resistance coefficient - dimensionless (coefficient of rolling friction - CRF)

  • 9. COMPRESSIBILITY AND SETTLEMENT

    incompressible sand deposits. Determine the settlement of the ground surface if a load of 50kN/m 2 is placed over a large area of the ground. The compressibility of the clay is given by Fig. 9.8(b). The densitites of the dry sand, saturated sand and clay are 2000kg/m 3, 2200kg/m 3 and 1600kg/m 3 …

  • Soil Compressibility & Settlement

    Coefficient of compressibility ... Sand may be considered as an elastic material with ... stress strain p E H H 1 E p H S pH E 1 S E 100 (v. loose)-800 (v. dense) kg/cm2. 7 Soil Mechanics – Third Year Civil Eng.Soil Mechanics (PBW N302) Example Compute the settlement due to compressibility of the sand

  • Influence of coefficient of uniformity and base sand ...

    Loose clean sands became more liquefiable as D 50-sand and CU sand decreases. • When base sands were mixed with silts, the trend above was reversed. • The reason is found to be related with the base sand gradation. • The influence of base sand gradation on liquefaction is dependent on FC. •

  • Description and classification of soils and rocks

    Sand 0.06—2 medium 0.2—0.6 fine 0.06—0.2 Silt <0.06 In soils where the cohesive fraction dominates the engineering behaviour (termed ''cohesive soils''), the soil is described as clay. BS 5930:1981 differentiates between silts and clays on the basis of their

  • Rolling resistance

    Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface is mainly caused by non-elastic effects; that is, not all the energy needed for deformation (or movement) of the wheel, roadbed, etc., is recovered when the pressure is removed. Two forms of this are hysteresis losses (see ...

  • Modulus of Subgrade reaction

    Structural Services, Inc. Page 2 of 11 In our paper, we will refer to Kp as the subgrade reaction based on the 30 in. diameter plate load test. The subgrade reaction is not a fundamental soil property. It is a lump constant of which the subgrade reaction

  • Determination of Soil Stiffness Parameters

    n small Computational Geotechnics Determination of Soil Stiffness Parameters Layer 1 (extremely loose sand Layer 1: Average Mohr-Coulomb model: Example 1 (loading): Computational Geotechnics Determination of Soil Stiffness Parameters Example 2 (unloading): Layer 1 (dense): Layer 3 (medium): Unloading: for both layers Mohr-Coulomb model: Layer 1 ...

  • Poisson''s Ratio Values for Various Soil Types

     · Mathematically, Poisson''s ratio is the negative ratio of transverse to axial strain. The Poisson''s ratio of a stable, isotropic, linear elastic material cannot be less than −1.0 nor greater than 0.5 with the later being a value typically associated with a perfectly incompressible material. It should be noted that exceptions to the above ...

  • Swell Factors for Various Soils

     · Swell Factors for Various Soils. A cubic yard of earth measured in its natural position swells to more than a cubic yard after it is excavated. This occurs because of an increase in voids. Swell is expressed as a percentage of natural volume, for example, if 10 yd 3 in the ground becomes 13 yd 3 after excavation, the swell factor is 30%.

  • Introduction to Soil Mechanics and Shear Strength

    • Friction is N multiplied by a friction coefficient. Weight, W. N, Normal Reaction Force. F, Friction. ... S am ple H eigh S hear Lo Loose Sand Dense Sand. Direct Shear Tests on Dry Sand. S S. ... same as sand – the pore pressures are equal to the ambient values which are a function of

  • Sand / Media Specifications

    coefficient (Uc) are the principal characteristics of granular media treatment systems. The ideal sand media for intermittent sand filters is a coarse sand with an effective size between 0.3 mm and 0.5 mm. The media sand grains should be relatively uniform in size having a low Uc value (less than 4.0) to

  • Coefficients Of Friction

    These companies can provide surface coating fluids containing particles to increase the coefficient of friction i.e. coefficient of friction to 0,25 to 0,3. (ref links 1 below) The American Gear Manufactures Association (AGMA) recommends a value of between 0,12-0,15 for hydraulically expanded hubs and 0,15-0,20 for shrink or press fit hubs.

  • COEFFICIENTS OF FRICTION OF VARIOUS ROADWAY …

    COEFFICIENTS OF FRICTION OF VARIOUS ROADWAY SURFACES DESCRIPTION OF ROAD SURFACE DRY WET Less than 30 mph More than 30 mph Less than 30 mph More than 30 mph From To From To From To From To PORTLAND CEMENT New, Sharp Traveled Traffic Polished .80 .60 .55 1.20 .80 .75 .70 .60 .50 1.00 .75 .65 .50 .45 .45 .80 .70 .65 .40 .45 .45 .75 .65

  • Sand Unit Weight or Specific Weight

    Specific Weight or Unit weight of Sand. Unit weight or Specific Weight of sand is calculated by the product of the density of sand and the standard gravity of sand. According to the US customary measurement system, dry weighs 1.631 gram per cubic centimeter, this density is equal to 101.8 pounds per cubic foot [lb/ft³].

  • Densities of Materials

    Densities of common products in both Imperial and SI-units. Related Topics . Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more ; Density - Density of different solid materials, liquids and gases. Definitions and convertion calculators.

  • Some Useful Numbers

    Loose sand 30-35 Medium sand 40 Dense sand 35-45 Gravel with some sand 34-48 Silt 26-35 Because the angle of internal friction,, is typically around 25-35, the coefficient of internal friction (tan is 0.5 to 0.7 Cohesive strength ( ...

  • Lateral Loaded Piles

     · The sand has a coefficient of variation of horizontal subgrade reaction equal to 10 tons/ft^3 (11.5 pci), and the piles are 50 feet long. Both piles are assumed to be free head piles and a 10 kip load is applied at the ground surface.

  • COEFFICIENT OF FRICTION

    Concrete to Soil / Rock: 0.30: Concrete to Steel : 0.45: Steel to Steel : 0.30: Steel to Teflon Plate: 0.10 : Brick Masonry on moist clay

  • Determining the Coefficient of Friction

    Molecular coefficient of friction concerns the force restricting the movement of an object that is sliding on an extremely smooth surface or where a fluid is involved. Rolling coefficient The rolling coefficient of friction combines static, deformation and molecular coefficients of friction. This coefficient of friction can be made quite low.

  • Tire friction and rolling coefficients

    Where g is the gravitational acceleration, v is the initial velocity when the brakes are applied and f r is the rolling resistance coefficient and was assume to be equal to 0.013. A common value for K, for production car, is 0.0000658 s 2 /m 2; e is the Euler number and is equal to 2.718281828.

  • Frictional Characteristics of Roadside Grass Types

    Loose moist dirt that allows tyre to sink about 5 cm 0.60-0.65 The coefficients tabulated in Table 1 are average values over a slide to stop i.e. locked-wheel braking manoeuvre. Although these coefficients were derived for American roadways, they appear to be suitable for local conditions as values given for gravel and asphaltic

  • Influence of coefficient of uniformity and base sand ...

     · The goal of this study is to investigate how the gradation of the base sand matrix and some characteristics of the overall gradation (e.g. coefficient of uniformity, gap gradation) influence the static liquefaction potential of loose clean sands and loose sands mixed with different contents and types of non-plastic silts (i.e. FC≤25%).

  • Database of Friction Angles of Sand and Consolidation ...

     · The paper presents diagrams of the (1) drained and undrained effective stress friction angles of sand; (2) dilatancy angle of sand; (3) parameters in a nonlinear constrained modulus expression for loading, unloading, and reloading on sand and silt; and (4) diagrams with the coefficient of permeability for sand, silt, and clay.

  • Design Manual Engineering Properties of Soil and Rock

    Chapter 200—Geotechnical Design Section 200E-1—Engineering Properties of Soil and Rock Page 3 of 12 Table 1: Typical unit weight values for soils in their natural state (after Peck, Hanson, and

  • Coefficient Of Permeability [ylyxoregxdnm]

    Soil Type Poorly graded sand with loose density Well-graded dense sand Loose density sand w angular particles Dense density sand w angular particles Stiff clay Soft clay Loess Soft organic clay Glacial till Input parametrs marked in purple: D10 = 0.0100 mm e = 0.45 k= 2.09E-04 cm/sec e 0.8 0.45 0.65 0.4 0.6 0.9 - 1.4 0.9 2.5 - 3.2 0.3

  • A study of the permeability of sand

    dirty sand, and rarely rises above 4,000, and, in a majority of ordinary sands, falls between 2,300 and 3,300. " 4 . dH = Hazen''s effective size in mm.—(Limited between 0.10 and 3.00 mm.) As an index of the gradation of the sand Hazen introduced the term "uniformity coefficient" which he defined as the ratio of

  • Modulus of Subgrade Reaction of Soils

     · k s = q/δ ——- (1). Where; k s = Coefficient of subgrade reaction expressed in force/length 2 /length q = pressure on the surface at the given point δ = settlement at the same point. Against many popular opinions, the modulus of subgrade reaction is not an exclusive property of soil but depends mainly on the loaded area (size of the footing or mat).