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The application of the standard penetration test (SPT) is of a high level of detail, delayed and expensive, requires skilled labor for its execution, and its use in sandy soils, restrictive in fine and plastic soils is recommended and not recommended in the other types. While in the multichannel analysis of surface waves (MASW) its execution is not restrictive, and allows to cover large areas in a short time, however, because it is an indirect method, its approximation must be verified by drilling, obtaining samples, and others high analysis criteria as appropriate. With the implementation and improvement of soil prospection techniques in recent years, relationship studies have been carried out between both trials with different parameters. An empirical correlation between the SPT tests was carried out by means of the number of penetration resistance strokes (N)60 as with the MASW test by means of the cutting wave velocities (Vs) in the sandy soils at 30 points in the city from Juliaca-Peru. There were 106 ordered pairs of data (N60; Vs); by means of the potential regression analysis the equation was obtained Vs = 83.505*N60^0.249; of the coefficient of determination R^2: 0.66 it was determined that the correlation is acceptable. The comparison was made with the correlation equations reported in the literature indicating that the proposed equation was in a trend consistent with them.

In this paper, performance of gravelly silty sand soil reinforced with geogrid are present and analyzed to improve the carrying capacity. For this, the geogrid was elaborated with a renewable material like bamboo with the same dimensions of polymer geogrids biaxial. This type of soil can be used for the construction of the sub-base and base of a pavement. California Bearing Ratio (CBR) tests was carried out to obtain the bearing capacity of the silty sand soil with and without bamboo geogrid. In addition, laboratory tests were carried out to obtain the mechanical properties of the bamboo. When comparing CBR results, an improvement in the bearing capacity was evidenced with the use of bamboo geogrid with a 20% increase in the carrying capacity. Finally, maximum tensile and bending strength of bamboo were 2000 kgf/cm2 and approximately 0.018 kgf/cm, respectively.

The global production of PET (Polyethylene Terephthalate) has been increasing in the last 50 years, however, in the last 10 years the production of plastic has increased exponentially, making the reuse of this material a worldwide challenge. This article presents the analysis of the mechanical properties of silty sand with the addition of recycled PET in percentages of 1%, 2%, 3%, 4% and 5%; for this, Granulometry, Atterberg limit, specific gravity, modified proctor and shear direct tests were performed in order to analyze the behavior of the mentioned mixtures. Experimental results showed an increase in shear strength with the addition of 3% PET.

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