International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 07 | July 2023
p-ISSN: 2395-0072
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Shear Strength Assessment of Pile’s Concrete Interface with different (Varying Moisture Content) Soil Layers Ikram Ullah1*, Haibing Cai1, Weijing Yao1, Shi Hu1, M. Kashif Qureshi2, Muhammad Sulaiman3 1School of Civil Engineering and Architecture, Anhui University of Science and Technology, No. 168 Taifeng Road,
Huainan 232001, Anhui, China.
2School of big data and Mathematics, Anhui University of Science and Technology, No. 168 Taifeng Road, Huainan
232001, Anhui, China.
3Department of Civil Engineering, CECOS University of IT & Emerging Sciences Peshawar KPK, Pakistan.
---------------------------------------------------------------------***--------------------------------------------------------------------foundations. This shear strength is expressed by MohrAbstract - This research is based on to investigating the
Coulomb law of shear strength shown in equation (1.1) = c + n tan Where: c is the cohesion of soil if any; n effective normal stress on the shearing failure plane and tan is the angle of internal friction of soil. In deep foundations of pile system, equation (1.1) takes the following shape shown in equation (1.2). = c + hK tan Here is the unit weight of soil; h is the depth where skin friction, is measured; K is the coefficient of lateral earth pressure at h level which a function of and is the angle of adhesion at depth h. For pile foundation, when the soil is sand, the angle of adhesion for skin friction is reasonable in the range of 3/4th of , it is established fact that moisture content does not affect the angle of friction of sand to greater extent; but it is nominal as a worst condition of greater value of moisture content when the soil is clay. This will make the second term in equations (1.1) and (1.2) negligible in case of clay. Another scenario may also arise when the pile is upper layer of clay and the underlying layer of sand. During pile installation, the clay content may get sandwiched between the pile and sand layer, smear effect that will reduce the angle of adhesion to almost zero at higher moisture content. To try to reduce the effect of nominal adhesion between clay and concrete pile surface, the clay is treated with lime. The lime reacts with clay and Na and K ions in clay are replaced by Ca of the lime. This increases the angle of friction of limetreated clay up to 40o and to some extent cohesion is increased but at mild rate (Szendefy, 2013). Pure clay and pure sand are also used as interfacing members with concrete surface for the determination of shear strength. Sand - clay mixture and concrete surface interface is also investigated for shear strength behavior. These results are compared with the interface shear strength of lime- treated clay and concrete surface. The internal resistance of soil mass per unit area that a soil mass can offer to resist sliding and failure along any plane inside it is called shear strength (). This is a very critical phenomena related to soil because it mostly fails in tension and shear. There are two important shear strength parameters considered for stability that are Cohesion (c) and angle of internal friction (Փ). The shear strength interface between Concrete and Soil is of unique
shear strength interface between concrete and different soil layers like (Clay, Sand and lime mix with other soil), which is very important to ensure the safety and stability of geotechnical engineering structures. Deep foundations like pile and retaining walls heavily rely on the shear strength between these materials to withstand external loads and environmental conditions. In this paper, several types of soils including clay, sand and lime-treated clay are study to know their effect on the shear strength interface. Experimental trials and numerical simulations are supervised to analyze the behavior of the interface under different moisture content conditions. Components like, fine content, sand content, clay content, and moisture content are studied to obtain their impact on shear strength. The results gained give valuable insights into the behavior of the concrete-soil interface and its vulnerability to these factors. The findings of this research identify the important of comprehension the shear strength properties of the concrete-soil interface for designing and constructing safe structures. By identifying the crucial elements affect shear strength, designers and engineers can make decisions concerning material selection, construction techniques, and structural strength analysis. This research adds to the field of geotechnical engineering by increasing knowledge on the shear strength behavior of the Pile foundation concrete-soil interface. The findings can be utilized to increase the design and construction elements, ultimately leading to stable and more efficient civil engineering structures. Key Words: Shear Strength, Soil Layers, Pile Foundation, Moisture content, Concrete.
1.INTRODUCTION Shear strength interface between concrete and soil is very crucial phenomena in the field of Geotechnical engineering. This phenomenon can be seen in deep pile foundations, retaining walls' back and backfill and foundation base and soil. It is important because it is that aspect of geotechnical engineering in which shear strength plays an important role in stability of the civil engineering structure. The shear strength of the interface is due to adhesion between two different materials like concrete surface and soil in pile
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