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首页> 外文期刊>Arabian Journal for Science and Engineering >CPT‑Based Nonlinear Stress-Strain Approach for Evaluating Foundation Settlement: Analytical and Numerical Analysis
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CPT‑Based Nonlinear Stress-Strain Approach for Evaluating Foundation Settlement: Analytical and Numerical Analysis

机译：基于CPT的非线性应力-应变方法评估地基沉降：解析和数值分析

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摘要

Due to complexities in soil-foundation interaction and nonlinear behavior of subsoil, considerable uncertainty is involved in the foundation settlement evaluation. In the present paper, a new analytical approach is proposed to estimate the foundation settlement based on soil behavior classification charts developed from CPT records. The approach is founded on the Janbu nonlinear stress-strain method. However, instead of using fixed parameters in the Janbu method, the variable coefficients are used depending on geomaterial properties. Also, in the proposed approach, the scale effect is taken into account for foundation width considering soil stiffness. The proposed procedure is calibrated and verified by a data bank containing 46 case histories including 22 square, 17 circular and 7 rectangular foundations with widths varying between 0.3 and 2.4 m in conjunction with CPT data. Furthermore, the numerical finite difference analysis using a CPT-based stress characteristics method is carried out to validate the proposed approach for the prediction of foundation settlement. The accuracy of the calculations done by the proposed and some available common methods is investigated. Comparisons based on statistical and probabilistic methods apparently reveal that the proposed approach calculates the foundation settlement promisingly.
机译：由于土壤-基础相互作用的复杂性和地下土壤的非线性行为，地基沉降评估涉及相当大的不确定性。本文提出了一种新的分析方法，它基于从CPT记录中得出的土壤行为分类图来估算地基沉降。该方法基于Janbu非线性应力应变方法。但是，不是根据Janbu方法使用固定参数，而是根据岩土材料属性使用可变系数。同样，在提出的方法中，考虑到土的刚度，考虑了地基宽度的尺度效应。数据库中包含46个案例历史记录，包括CPT数据，其宽度在0.3到2.4 m之间变化，该数据库包含46个案例历史记录，包括22个正方形，17个圆形和7个矩形基础，对其进行了校准和验证。此外，使用基于CPT的应力特征方法进行了数值有限差分分析，以验证所提出的基础沉降预测方法。研究了由提出的方法和一些可用的常用方法完成的计算的准确性。基于统计和概率方法的比较显然表明，所提出的方法有望计算基础沉降。

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