Research on tangent modulus of gravel core materials under high pressure

ZHAO Hong-fen; HE Chang-rong; WANG Chen; CHEN Ji-ping; Zhang Xi-dao

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Research on tangent modulus of gravel core materials under high pressure

更新时间：2026-06-25

- Research on tangent modulus of gravel core materials under high pressure
- Vol. 29, Issue S1, (2008)
- 作者机构：
  
  四川大学水利水电学院,成都,610065
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU457
- Online First：15 April 2016，
  
  Published：2008
- 稿件说明：
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ZHAO Hong-fen, HE Chang-rong, WANG Chen, et al. Research on tangent modulus of gravel core materials under high pressure[J]. 2008, 29(S1).
DOI：

ZHAO Hong-fen, HE Chang-rong, WANG Chen, et al. Research on tangent modulus of gravel core materials under high pressure[J]. 2008, 29(S1). DOI：

摘要

使用高压大型三轴仪，对某300 m级土石坝的砾质土心墙料进行了最高围压5 MPa的三轴试验。试验结果表明砾质土的应力-应变关系符合双曲线关系，抗剪强度包络线呈非线性。根据参数的物理意义，初始模量Ei应在尽可能小的应变范围内取值，最大主应力差应在大应变范围内取值，且实际工程的应变在1 %左右，建议在?a= 0 %～3 %下取Ei值，在?a = 5 %～15 %下取值，数据拟合表明建议取值法比传统取值法拟合度高。由于试验的围压范围较大，提出把围压分0.2～1.0 MPa，1.5～3.0 MPa，3.5～5.0 MPa三段分别取切线模量，通过回归证明拟合较好。

Abstract

With the large-scale triaxial apparatus

triaxial tests of gravel soil for a 300m high embankment dam were carried out; the highest confining pressure is to 5 MPa. The experimental results show that the stress-strain curve of gravel soil is a hyperbolic one; and that shear strength envelope of gravel soil is nonlinear. According to physical meaning of Duncan-Chang model

initial modulus Ei should be obtained in the area of minimum value of axial strain εa; and ultimate principal stress difference (σ1－σ3 )ult from a bigger range of εa; so propose that Ei is obtained in the area of εa=0%-3% and (σ1－σ3 )ult in the area of εa=5%-15%. The proposed method is more reasonable than the traditional method because the actual strain of high earth dam is about 1%

. As the confining pressure of the triaxial test is in a large range

confining pressure is divided into three parts

such as 0.2-1.0 MPa

1.5-3 .0 MPa

3.5-5.0 MPa; and the tangent modulus in each range of confining pressures are gained respectively. It is proved to be reliable by the comparison between test data and computing data.

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