On the Comparison of the Modified Secant Modulus Method and Duncan-Chang Tangent Modulus Methed

Yuan Jianxin; Mao yuan

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On the Comparison of the Modified Secant Modulus Method and Duncan-Chang Tangent Modulus Methed

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- On the Comparison of the Modified Secant Modulus Method and Duncan-Chang Tangent Modulus Methed
- Vol. 5, Issue 1, (1984)
- 作者机构：
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- Online First：10 March 2017，
  
  Published：1984
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Yuan Jianxin, Mao yuan. On the Comparison of the Modified Secant Modulus Method and Duncan-Chang Tangent Modulus Methed[J]. 1984, 5(1).
DOI：

Yuan Jianxin, Mao yuan. On the Comparison of the Modified Secant Modulus Method and Duncan-Chang Tangent Modulus Methed[J]. 1984, 5(1). DOI：

摘要

本文提出了用非线性增量分析双曲线应力-应变关系中的修正割线模量公式

并应用这一方法对湖北某一土坝进行了分析计算

同时也采用了邓肯-张公式中的切线模量进行了对比分析.本文所提出的修正剖线模量公式避免了在使用邓肯-张公式时确定初始模量的困难和试验工作.在应用邓肯-张公式确定初始模量时

当最小主应力很小时应用了先期固结压力的概念.对比计算结果表明

邓肯-张公式的计算受初始模量影响较大

而修正割线模量的计算则不受此影响

并较接近实测情况.

Abstract

The modified secant modulus formula derived from the hyperbolic stress-strain relation is presented in this paper. Based on this proposed formula an analysis was made for the earth dam located in Hubei province

At the same time

similar analysis was also carried out by using the tangent modulus formula derived by Duncan and Chang. The modified modulus formula described in this paper evade the difficulties and the testing work involved in determing the initial modulus of the stress-strain curve as required by the Duncan-Chang equation. The concept of pre-consolidation pressure for soil is employed to modify the formula of initial modulus appeared in Duncan’s equation when minor principal stress is very small. Comparison of the calculations based on these two formulas revealed that the final results obtained by Duncan’s formula were influenced by initial modulus significantly while that by modified secant formula is independent of the initial modulus

and moreover

the final results obtained by modified secant formula are in agreement with that from observations.

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