Critical state of rockfill materials and a constitutive model considering grain crushing

LIU En-long; CHEN Sheng-shui; LI Guo-ying; ZHONG Qi-ming

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Critical state of rockfill materials and a constitutive model considering grain crushing

更新时间：2026-06-25

- Critical state of rockfill materials and a constitutive model considering grain crushing
- Vol. 32, Issue S2, (2011)
- 作者机构：
  
  1. 四川大学水利水电学院水力学与山区河流开发保护国家重点实验室,成都,610065
  2. 南京水利科学研究院,南京,210029
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU411
- Online First：26 August 2011，
  
  Published：2011
- 稿件说明：
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LIU En-long, CHEN Sheng-shui, LI Guo-ying, et al. Critical state of rockfill materials and a constitutive model considering grain crushing[J]. 2011, 32(S2).
DOI：

LIU En-long, CHEN Sheng-shui, LI Guo-ying, et al. Critical state of rockfill materials and a constitutive model considering grain crushing[J]. 2011, 32(S2). DOI：

摘要

高应力水平时堆石料的颗粒破碎对其强度和变形机制有重要影响。临界状态土力学理论对重塑土的应力-应变关系的描述较为成功，但目前颗粒破碎对堆石料的临界状态的影响及其数学描述鲜有研究。对堆石料进行了固结应力从0.4 MPa到4 MPa的18组固结排水和固结不排水常规三轴压缩试验，以及6组等向压缩试验。试验结果表明：在排水条件和不排水条件下，不同的固结应力试样都趋于临界状态；堆石料的临界状态在q-p′平面和e-lgp′平面均为非线性变化。基于此试验结果，通过引入状态参数，在广义塑性力学的理论框架下，建立了考虑颗粒破碎的堆石料本构模型，并给出了模型参数的确定方法。与长河坝料的试验进行了对比，结果表明所建议的本构模型可以较好地模拟堆石料从低围压0.4 MPa到高围压 3.5 MPa下的应力-应变特性

Abstract

The grain crushing of rockfill materials with high stress level has significant influence on its strength and deformation mechanisms. The soil mechanics theory based on critical state concept can describe the stress-strain relationship of reconstituted soils successfully

but currently for rockfill materials

few studies are conducted on influence of grain crushing on critical state and its mathematical description. The consolidation drained and undrained triaxial compression tests of 18 sets with consolidation stress ranging from 0.4 MPa to 4 MPa and isotropic compression tests of 6 sets were conducted on rockfill materials. The experimental results show that: for all the consolidation confining pressures

the samples tended to critical state under drained and undrained conditions; and the critical states of rockfill materials in q-p′ plane and e-lgp′ plane all behave nonlinear. Based on these experimental results and by introducing state parameter

a new constitutive model for rockfill materials is formulated under the framework of generalized plasticity; and the determination of model parameters is provided as well. Finally

the constitutive model is used to simulate the test results of rockfill materials from Changhe Dam; and it is verified that the proposed constitutive model could simulate well the stress-strain features of rockfill materials with the consolidated confining pressures ranging from 0.4 MPa to 3.5 MPa.

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