# Analyzing The Soil Structure Of Soil Properties

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On the other hand, soil properties are very difficult to determine because in comparison to steel and concrete, it is a lenient material, which makes it very difficult to acquire samples for testing that will produce laboratory results on the same level as its everyday behaviour. Other problems are; the type of soil affects the ability to collect representative samples eg. stiff clay is more difficult to sample than soft clay. Differences in sampling techniques in laboratories further complicate the problem. Additional complicating factors are that soil material properties are stress dependent, and the soil profile will in practice consist of layers of materials with different material properties, because of this, the true properties of…show more content…
Application of the Winkler model involves the solution of a four-order differential equation. For beams, the equation to be solved is; Where D = the beam flexural rigidity k = the modulus of soil modulus q = the uniformly distributed load on the beam The model consists of linearly elastic springs with a stiffness of "k," placed at discrete intervals below the beam, where k is the modulus of soil modulus of the soil. The model is also known as a "one-parameter model" 1.3 Problems with the Winkler Model Determination of the Modulus of Soil modulus In addition to the relative difficulties involved in the solution of this equation, it is not commonly used by practicing engineers because of the difficulty involved in determining the value of the modulus of soil modulus, k. Researchers have worked on developing techniques for the determination of k. One of the most decisive papers was by Terzaghi (1955). He showed that the soil modulus depends upon the dimensions of the area acted upon by the soil modulus. The Winkler theory assumes that no interaction exists between adjacent points in the soil profile. As shown in Figure 1, the springs are considered as isolated foundation elements. In order to improve the physical representation and still apply a relatively simple model, researchers have progressed on two different routes. Cheung and Zienkiewicz (1965), have considered the problem of beams on an elastic semi-infinite profile by introducing Figure 1