土石混合料大型直剪试验的颗粒离散元细观力学模拟研究

›› 2010, Vol. 31 ›› Issue (9): 2695-2703.

土石混合料大型直剪试验的颗粒离散元细观力学模拟研究

贾学明^{1, 2}，柴贺军²，郑颖人³

1. 中国科学院武汉岩土力学研究所，武汉 430071；2. 招商局重庆交通科研设计院有限公司，重庆 400067；3. 后勤工程学院，重庆 400041

收稿日期:2009-06-16 出版日期:2010-09-10 发布日期:2010-09-16
基金资助:
重庆市科技攻关计划项目（No. 2008ac6047）；交通部西部开发项目（No. 200231800034）。

Mesomechanics research of large direct shear test on soil and rock aggregate mixture with particle flow code simulation

JIA Xue-ming ^{1, 2}，CHAI He-jun²，ZHENG Ying-ren³

1. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Chongqing Communications Research & Design Institute Co., Ltd., China Merchants, Chongqing 400067, China; 3. Logistical Engineering University, Chongqing 400041, China

Received:2009-06-16 Online:2010-09-10 Published:2010-09-16
Supported by:
贾学明，男，1974年生，博士研究生，副研究员，主要从事道路工程方面的研究工作。

摘要/Abstract

摘要：

土石混合料作为一种特殊的岩土介质越来越受到国内外众多研究者的重视。基于3维颗粒离散元PFC3D，建立了土石混合料直剪试验模型，进行了不同含石量、不同岩性的土石混合料直剪试验模拟研究。颗粒离散元模拟结果表明，土石混合料的石料岩性和含石量在很大程度上控制了土石混合料的抗剪强度特性。硬岩混合料的摩擦角普遍比软岩混合料大6°～ 7°，含石量为60%～80%时达到最大。土石混合料的剪切面不再是一个平面，其起伏度随含石量增加而增大。剪切过程中软岩混合料在低正应力下表现为剪胀，高正应力下表现为剪缩，并产生软化现象，硬岩混合料表现为剪胀和塑性；软岩土石混合料剪切过程中能量以应变能和动能为主，而硬岩土石混合料的能量以摩擦能和动能为主。

关键词: 土石混合料, 颗粒离散元, 细观力学, 直剪试验, 剪切面

Abstract:

With the development of geomechanics and the requirements of many large-scale engineering projects, especially in road, water conservancy, etc., the soil and rock aggregate mixture has been regarded as a special type of soil and rock material which attracts more and more attention for geotechnical engineers. Based on three dimensional particle flow code PFC3D, the direct shear test model of soil and rock aggregate mixture is established; and the simulation with different rock contents and different rock properties is carried out. According to the simulation results, the rock content and properties control the shear strength to a large extent. The friction angle of hard soil and rock aggregate mixture is 6°-7°larger than that of soft soil and rock aggregate mixture; and the largest friction angle occurs under about 60%-80% rock content. The shear surface of soil and rock aggregate mixture is no longer a flat surface; and the surface band increases with the increase of rock content. In the shear process, the soft rock mixture exhibits dilatancy under low normal stress, shear contraction under high normal stress and strain softening; while the hard rock mixture displays dilatancy and plasticity. The energies are mainly kinetic energy and strain energy for soft rock mixture; while the energies are mainly friction energy and kinetic energy for hard rock mixture.

Key words: soil and rock aggregate mixture, particle flow code, mesomechanics, direct shear test, shear surface

中图分类号:

TU 411

贾学明，柴贺军，郑颖人. 土石混合料大型直剪试验的颗粒离散元细观力学模拟研究[J]. , 2010, 31(9): 2695-2703.

JIA Xue-ming，CHAI He-jun，ZHENG Ying-ren. Mesomechanics research of large direct shear test on soil and rock aggregate mixture with particle flow code simulation[J]. , 2010, 31(9): 2695-2703.

参考文献

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