# subgrade reaction coefficient

### Table 41. Typical values of modulus of subgrade reaction

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Get Price### Soil SubGrade Modulus StructurePoint

Soil SubGrade Modulus SubgradeSubbase Strength Soil bearing capacity, soil compressibility, and soil modulus of subgrade reaction are various measures of strengthdeformation properties of soil. It is important to consider how these parameters apply to the design of floor slabs.

Get Price### Structural Engineering: Subgrade Reaction

Subgrade reaction found from above equation can be used to model raft foundations, footings and combined footings. However, when we model piles, it is better to refer some other method of obtaining subgrade reaction even though this above method may be used for the analysis. For analysis and design of combined footings, refer following pages.

Get Price### The Coefficient of Subgrade Reaction and Its Accuracy on ...

Sadrekarimi, Jamshid and Ghamari, Maryam Akbarzad, "The Coefficient of Subgrade Reaction and Its Accuracy on Design of Foundations" (2008). International …

Get Price### subgrade reaction coefficient | SpringerLink

subgrade reaction coefficient, coefficient of (sub)grade reaction, coefficient of base grade reaction, modulus of (sub)grade reaction, (sub)grade modulus, base grade reaction coefficient (US); coefficient of formation reaction, formation reaction coefficient (Brit.)[An experimentally determined ratio between the vertical (sub)grade reaction and the deflection at a point on the contact surface ...

Get Price### Modulus of Subgrade reaction Which one to use

names in various publications such as modulus of subgrade reaction, subgrade reaction, subgrade modulus, coefficient of subgrade reaction, Winkler foundation (E. Winkler first proposed the subgrade reaction in 1867 [Ref. 16]), Winkler subgrade, “K” value, etc.. In our paper, we will use either subgrade reaction …

Get Price### Soil Subgrade Reaction Civil Engineering Downloads

Subgrade reaction found from above equation can be used to model raft foundations, footings and combined footings. However, when we model piles, it is better to refer some other method of obtaining subgrade reaction even though this above method may be used for the analysis.

Get Price### Evaluation of modulus of subgrade reaction (Ks) in gravely ...

Evaluation of modulus of subgrade reaction (K s) in gravely soils based on SPT results ... Hence, the modulus of sub grade reaction (k s) for the soil is given by k s =P/δ where P is the ground bearing pressure at a point along the beam, and δ is the vertical displacement of the beam at that point. ... Energy effect coefficient depending on ...

Get Price### Evaluation of Modulus of Elasticity and Modulus of ...

This paper presents the procedure of evaluation of the modulus of elasticity (E) and the modulus of subgrade reaction ( k s ) value based on the California Bearing Ratio (CBR) tests and FEM analysis. The pressuredisplacement response of the soil in the CBR mould is simulated using Cosmosworks FEM model where the soil, the load plunger, and the steel mould of CBR are represented.

Get Price### Railroad Subgrade Support and Performance Indicators

performance. Overall track stiffness, of which subgrade stiffness is a segment of, typically is not considered in trackbed design practices. Therefore, it is advantageous for future subgrade testing to have a means of calculating soil modulus as track stiffness becomes a prevailing means of designing and assessing railroad trackbeds.

Get Price### Correlation between soil bearing capacity and modulus of ...

foundation, and the soil was defined using coefficient of subgrade reaction. For this exercise, the software default value for the modulus of subgrade reaction was used. The displacement diagram shows a dishing effect as discussed earlier. Figure 1‐b shows the soil pressure contour. It

Get Price### Modulus of Subgrade Reaction Pavement Interactive

The modulus of subgrade reaction (k) is used as a primary input for rigid pavement design. It estimates the support of the layers below a rigid pavement surface course (the PCC slab). The kvalue can be determined by field tests or by correlation with other tests.

Get Price### RELATIONSHIP BETWEEN THE SUBGRADE REACTION …

Total 15 sets of uPLTs and rPLTs (total 30 tests) were conducted on the subgrade at highspeed railway construction sites between Daegu and Busan in South Korea. The objective of field tests was to evaluate the correlation between the subgrade reaction modulus obtained from the uPLT test and the strain modulus obtained from the rPLT test.

Get Price### Lateral SoilPile Stiffness Subjected to Vertical and ...

and factors like soil nonlinearity, variation of subgrade reaction with depth, and soil layers can be incorporated relatively easily. Several empirical coeﬃcients developed from pile test are used in the analysis of piles using subgrade reaction modulus approach. Palmer and Thompson’s [1] formula for subgrade reaction kh was

Get Price### COEFFICIENT OF DYNAMIC HORIZONTAL SUBGRADE …

the pile foundation. In this method, the coefficient of dynamic horizontal subgrade reaction (Khe) is expressed as the product (Khe =α Kh) of the coefficient of static horizontal subgrade reaction (Kh) and a correction factor (α), when the seismic intensity method or the ultimate lateral strength method during earth quake is adopted.

Get Price### Analyses of Lateral Loaded Piles with PY Curves ...

Analyses of Lateral Loaded Piles with PY Curves Observations on the Effect of Pile Flexural Stiffness and Cyclic Loading NCDOT 7th 3Geo T2, Raleigh, NC, ... • Coefficient of subgrade reaction (n h): rate of increase of subgrade reaction modulus (K) with depth (z): K = n h

Get Price### Lateral Subgrade Modulus of Sands for Deep Foundations

where k i the coefficient of subgrade reaction, assumed to be a function of relative density of soil only, and EI is the bending tiffne s of the pile. Terzaghi (1) has shown that the horizontal coefficient of subgrade reaction kh at depth Z, for a pile with diameter B, in sand can be found as (2)

Get Price### What is the Significance of Modulus of Subgrade Reaction ...

Modulus of subgrade reaction is an important term that is frequently used in structural analysis of components of is used to design continuous footings, rafts and different types of piles. Modulus of subgrade reaction is a relationship between pressure and associated deflection of soil. Plate load test can produce these data.

Get Price### BEHAVIOUR OF LATERALLY LOADED PILES. NDSU

horizontal subgrade reaction coefficient (Subgrade Modulus), kh defined by Terzaghi (1955), by the equation: k h= P / y where k h Horizontal subgrade reaction coefficient, P Load transferred from the pile to the surrounding soil per unit depth , y Lateral deflection of the pile at the

Get Price### STRUCTURE magazine | Subgrade Modulus – Revisited

The Subgrade Modulus, also known as the Modulus of Subgrade Reaction, is a stiffness parameter typically used in defining the support conditions of footings and mat foundations, such as that shown on Figure parameter is expressed in units of [Force]/[Length] however, it is defined as the (contact) bearing pressure of the foundation against the soil that will produce a unit ...

Get Price### Subgrade Modulus of Laterally Loaded Piles in Clays

Subgrade Modulus of Laterally Loaded Piles in Clays DANIEL 0. WONG Pilesoil interaction of laterally loaded piles may be characterized by either linear subgrade modulus methods or the nonlinear load transfer relationships, termed py curves. The selection of a subgrade modulus to analyze lateral behavior of piles relies heav

Get Price### Investigation of Subgrade Reaction Coefficient in Sandy Soil

Parametric studies on subgrade reaction coefficient of sand soil in Bandar Abbas city are few, so this paper uses geotechnical data of a site in Bandar Abbas city (Iran) to determine subgrade reaction coefficient by using of theoretical, experimental relations and numerical methods.

Get Price### Lateral Loaded Piles Modulus of Horizontal Subgrade ...

Sep 18, 2006· Technically, N(sub H) is the "constant of modulus of horizontal subgrade reaction" or the "coefficient of variation of horizontal subgrade reaction". K is the modulus of horizontal subgrade reaction. Okay, you probably knew all that, but I wanted to make sure we're on the same page. My point about both sources using the same equation for T is ...

Get Price### EVALUATION OF COEFFICIENTS OF SUBGRADE REACTION [Soil ...

The Paper contains a discussion of the factors which determine the value of the coefficients of both vertical and horizontal subgrade reaction of cohesionless sand and stiff clay, and numerical values are proposed for the constants which appear in the equations defining these coefficients.

Get Price### Modulus of Subgrade Reaction | Geo Hydro Engineers

The magnitude of (k) typically ranges from about 100 to 250 pci, sometimes higher, depending on the subgrade materials and conditions. Additionally, the modulus of subgrade reaction used for design (effective modulus of subgrade reaction) can be enhanced by using a …

Get Price### Modulus of Subgrade Reaction and Deflection

Modulus of Subgrade Reaction and Deflection Abstract Differential equations govern the bending and deflection of roads under a concentrated load. Identifying critical parameters, such as the maximum deflection and maximum bending moments of a street supported by an elastic subgrade, is key to designing safe and reliable roadways.

Get Price### Subgrade Reaction an overview | ScienceDirect Topics

k s (coefficient of subgrade reaction) Coefficient of subgrade reaction for clay soils is obtained from Table . Table shows the coefficient of subgrade reaction versus undrained shear strength.

Get Price### Coefficient of subgrade reaction | Article about ...

The elg P curve is a straight line (curve (bc) in Figure 5), and the earth pressure is a function of one variable coefficient of subgrade reaction. Based on the coefficient of the subgrade reaction, the relationships among the alarming index, earth pressure, and damage stability of …

Get Price### Modulus of subgrade reaction Geotechnical engineering ...

Dec 31, 2002· The modulus of subgrade reaction is not a soil property. As a result, it cannot be "determined" using a CBR test, plate load test or any other test, for that matter. The modulus of subgrade reaction is a calculation expedient, and nothing more. It is the ratio of applied pressure divided by the corresponding soil or rock movement.

Get Price### STRUCTURE magazine | Correlation between Soil Bearing ...

These index material properties continue to be used by many highway agencies. Correlations are provided in both design procedures for relating CBR and Rvalues to M R (or, in the case of the AASHTO Guides, to the structural layer coefficients a i). The modulus of subgrade reaction (k) used in the AASHTO Guides is also correlated to M R.

Get Price### Interpretation of Subgrade Reaction from Lateral Load ...

Where nh is the coefficient of subgrade reaction and d is pile diameter. This applies to cohesionless soils and normally consolidated clays where these soils indicate increasing strength with depth due to increase in overburden pressure. Figure 2 : Subgrade Reaction Model of (1) Actual Soil Reaction …

Get Price### What is Modulus of Subgrade Reaction in Foundation ...

Subgrade reactions is the pressure distribution that is developed due to reaction of a subgrade. The reaction is developed due to loads that are imposed to foundation structure. The determination of the modulus of subgrade reaction is a complex attempt as it depends on many parameters of individual types and density of soils.

Get Price### (PDF) Subgrade Reaction Modulus (K s ) of Clayey Soils ...

Results show that there is a significant correlation between subgrade reaction modulus (K s) and SPT blow counts. ... of Clayey Soils Based on Field ... The obtained correlation for coefficient of ...

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