块石长轴倾角对土石混合体宏观力学性能的影响研究

张佩; 杜修力; 金浏; 路德春; 龚秋明

doi:10.6052/j.issn.1000-4750.2017.05.0362

块石长轴倾角对土石混合体宏观力学性能的影响研究

doi: 10.6052/j.issn.1000-4750.2017.05.0362

北京工业大学城市与工程安全减灾教育部重点实验室, 北京 100124

基金项目: 国家自然科学基金重点项目（51538001）；北京市自然科学基金重点项目（8161001）

详细信息

作者简介:
张佩(1988-),女,山东人,博士生,主要从事隧道与地下工程领域研究(E-mail:zhangpei068@163.com);金浏(1985-),男,江苏人,教授,博士,主要从事混凝土及混凝土结构理论研究(E-mail:zkinglew2007@163.com);路德春(1977-),男,黑龙江人,教授,博士,主要从事强度理论与土的本构模型领域研究(E-mail:zdechun@bjut.edu.cn);龚秋明(1977-),男,湖南人,教授,博士,主要从事岩土工程勘察及监测领域研究(E-mail:zgongqiuming@bjut.edu.cn).

通讯作者:
杜修力(1962-),男,四川人,教授,博士,博导,主要从事地震工程领域研究(E-mail:duxiuli@bjut.edu.cn).

中图分类号: P642.3
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出版历程
- 收稿日期: 2017-05-15
- 修回日期: 2017-10-31
- 刊出日期: 2018-09-29

STUDY ON THE ORIENTATION ANGLE OF ROCK LONG AXIS ON THE MACROMECHANICAL PROPERTIES OF SOIL-ROCK-MIXTURE

Key Lab of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China

摘要

摘要: 作为一种非均质材料，土石混合体的宏观力学性能与其内部块石细观结构密切相关。在外荷载作用下，土石混合体中存在块石骨架结构和非结构性土体两种荷载传递体系。该文从荷载传递路径和剪切路径发展两个角度，对块石的结构效应进行了分析，明确了块石长轴倾角这一细观因素对土石混合体抗剪强度的影响机理。将土石混合体视为由块石和土体基质组成的两相复合材料，采用椭圆形描述块石，建立土石混合体细观分析模型，并开展了300组双轴压缩试验。进而从主应力差值、内摩擦角及黏聚力三个角度，针对块石长轴倾角对土石混合体宏观力学性能的影响规律进行了分析。结果表明：当块石长轴倾角在0°~90°变化时，土石混合体的主应力差值及强度参数均呈现出先减小后增大的趋势；当块石长轴倾角为45°+φ_s/2时，主应力差值及强度参数均取得最小值；主应力差值及强度参数随块石长轴倾角的变化规律均可采用抛物线方程描述。
- 土石混合体 /
- 细观方法 /
- 宏观力学性能 /
- 块石结构效应 /
- 块石长轴倾角
Abstract: As a typical heterogeneous soil, the macro-mechanical behavior of soil-rock-mixture is related with rock meso-structure closely. Under applied loads, two kinds of load transfer mechanism, i.e., rock structure system and non-structural soil matrix system, were developed. From load transfer path and shear path, the structure effect of rocks were analyzed. Then, the influence of rock long axis angle on the shear strength is identified. By treating the soil-rock-mixture as a two-phase composite composing by rock block and soil, biaxial compression mesoscopic analysis models were established and validated. Then a series of numerical tests with different orientation angles of rock long axis were carried out. The influence of orientation angle of rock long axis on the macro-mechanical properties of soil-rock-mixture were discussed, including the deviator stress, internal friction angle, cohension. The analysis results indicate that with the increment of orientation angle of rock long axis from 0° to 90°, the deviator stress and strength parameters all decrease initially and then increase. The relationship between deviator stress and orientation angel of rock long axis can be described as a parabolic curve.
- soil-rock-mixture /
- meso-scale method /
- macro-mechanical properties /
- stone structure effect /
- orientation angle of rock long axis

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