中主应力对砂土强度影响的细观机制研究

›› 2010, Vol. 31 ›› Issue (12): 3751-3757.

中主应力对砂土强度影响的细观机制研究

迟明杰^{1, 2}，李小军^{1, 2}，周正华²，赵纪生²，周国良²

1.中国地震局地球物理研究所，北京 100081；2.中国地震局工程力学研究所，哈尔滨 150080

收稿日期:2010-09-07 出版日期:2010-12-10 发布日期:2010-12-21
作者简介:迟明杰，男，1978年生，博士，副研究员，主要从事土的基本性质及其工程应用以及岩土地震工程的研究工作。
基金资助:
国家重点基础研究发展计划(973)项目（No. 2007CB714200）；国家自然科学基金重大研究计划资助项目（No. 90715038）；中国博士后科学基金（No. 20090451030）；地震工程与工程振动开放试验室基金（No. 2009A05）。

Meso-scale study of effects of intermediate principal stress on strength of sand

CHI Ming-jie1, 2, LI Xiao-jun1, 2, ZHOU Zheng-hua2, ZHAO Ji-sheng2, ZHOU Guo-liang

1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China; 2. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China

Received:2010-09-07 Online:2010-12-10 Published:2010-12-21

摘要/Abstract

摘要：

基于简化的颗粒单元体模型，分析总结了颗粒单元体的基本特点，针对中主应力对砂土强度的影响，重点分析了颗粒单元体之间的相互影响特点。对以往的真三轴试验结果进行了总结，得到了中主应力对砂土强度影响的规律，结合颗粒单元体的两种基本状态及其特点、大孔隙与颗粒单元体结构孔隙的特点以及颗粒单元体间相互影响的特点，揭示了中主应力对砂土强度影响规律的细观物理机制。这些规律包括：松砂的强度随着中主应力的增大是逐渐提高的；密砂随中主应力的增大，强度先提高，当中主应力接近大主应力时，却引起强度的降低；砂土越密实，强度平台段越长；在中主应力接近小主应力阶段，强度随中主应力的增大而提高的快慢与砂土的密实程度有关。

关键词: 砂土, 中主应力, 强度, 颗粒单元体, 细观力学

Abstract:

Based on the simplified model of the unit of particles, the basic principles and characteristics of the unit of particles were analyzed; and considering the deformation and strength of sand with the effect of intermediate stress, the interaction properties of the units of particles were discussed in detail. The effects of intermediate principal stress on the strength of sand were analyzed from the results of previous triaxial texts. Some macro features of the effect of intermediate stress on strength of sand were interpreted in view of meso-scale study through the analyses of the basic states and properties of the unit of particles, the features of macro-pore and unit pore, the interaction properties of the units of particles and relative physical mechanism. The macro features include that the strength of loose sand is improved gradually if the intermediate principal stress increases from the minor principal stress ?3 to the maximum principal stress ?1; but the strength of dense sand is improved at the beginning and reduced if the intermediate principal stress approach the maximum principal stress ?1; the segment of constant strength increases with the increase of sand density; the rate of strength improvement is effected by the initial ratio of sand if the intermediate principal stress is close to the minor principal stress ?3.

Key words: sand, intermediate principal stress, strength, unit of particles, mesomechanics

中图分类号:

TU 411

迟明杰，李小军，周正华，赵纪生，周国良. 中主应力对砂土强度影响的细观机制研究[J]. , 2010, 31(12): 3751-3757.

CHI Ming-jie, LI Xiao-jun, ZHOU Zheng-hua, ZHAO Ji-sheng, ZHOU Guo-liang. Meso-scale study of effects of intermediate principal stress on strength of sand[J]. , 2010, 31(12): 3751-3757.

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