Correlation of Shear Strength Parameters and SPT N1 60 Values of Coarse and Fine Grained Soils of Gujarat Region

Abstract

Shear strength is a fundamental property of soils and is an essential parameter in newlinegeotechnical engineering. Shear strength is crucial for designing foundations, retaining newlinewalls, slopes, and other civil engineering structures and to assess the stability of soil newlinemasses under various loading conditions. For a reliable Geotechnical design, it is newlinenecessary to consider most appropriate shear parameters which simulate the actual site newlineconditions. Thus, it is highly important to collect the undisturbed samples which are newlineknown to retain the structural integrity of the in-situ soil and conduct laboratory test. newlineHowever, recovery and retrieval of undisturbed soil samples at greater depths with newlinehigher N values is difficult with conventional drilling methods and sampling methods. newlineHence it is necessary to obtain reliable shear parameters for geotechnical design based newlineon test data such as Standard Penetration test (SPT) or Cone Penetration test (CPT). newlineNumerous researchers have undertaken the interpretation of SPT N values, along with newlineother index properties of soil, including unit weight, plasticity, liquid limit, Atterberg s newlinelimits, and particle size distribution, in relation to the shear strength parameters newlinerepresented by C and Phi. However, it is important to exercise caution when applying newlinethese empirical correlations, as their relevance is location-specific and may not be newlineuniversally applicable. newlineThis research presents a comparative study of the angle of shearing resistance (and#934;) and newline C value of Coarse and fine grained soils estimated from correlation using SPT (N1)60 newlinewith the Phi (and#934;) and C values obtained from Laboratory tests. Based on the comparative newlineanalysis for obtaining reliable parameters specific to the study area, new correlations newlinehave been developed. The study investigated the error in prediction of angle of shearing newlineresistance (and#934;) of SM, SC and ML soils and Cohesion C of fine grained (CL, CI and CH) newlinesoils for the values obtained from correlations using SPT (N1)60 in comparison to the newlineshear parameters