This state-dependent stress-strain relationship was utilized to calculate the settlement of footings based on the theory of elasticity. The corresponding modulus variation was determined by considering the stress level and strain at each depth. Vertical stress increments were determined using two different profiles of the strain influence factor ( I z) proposed in Schmertmann’s method and that calculated from the theory of elasticity. By combining the V S measured in the field and the modulus reduction curve measured in the laboratory, the deformation characteristics of soil can be reliably estimated. The V S was utilized to represent soil stiffness instead of cone tip resistance ( q c) because the V S can be directly related to the small-strain shear modulus. In order to predict the settlement of shallow footings in granular soil, the V S and the concept of Schmertmann’s framework were adopted. Based on these analyses, we propose a procedure for the estimation of footing settlement in sands based on CPT results.The shear wave velocity ( V S) is a key parameter for estimating the deformation characteristics of soil. For each case, the cone penetration resistance q c is calculated using CONPOINT, a widely tested program that allows computation of q c based on cavity expansion analysis. Calculations are made for both normally consolidated and heavily overconsolidated sands with various relative densities. In this article, we analyze the load-settlement response of vertically loaded footings placed in sands using both the finite element method with a nonlinear stress-strain model and the conventional elastic approach. The settlements of footings in sand are often estimated based on the results of in situ tests, particularly the standard penetration test (SPT) and the cone penetration test (CPT). Thus, in order to accurately predict working settlements, analyses that are more realistic than simple elastic analyses are required. Well-designed foundations induce stress-strain states in the soil that are neither in the linear elastic range nor in the range usually associated with perfect plasticity. The settlement of foundations under working load conditions is an important design consideration.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |