粉土基泡沫轻质土三轴力学特性

doi:10.6040/j.issn.1672-3961.0.2021.113

山东大学学报 (工学版) ›› 2022, Vol. 52 ›› Issue (1): 39-46.doi: 10.6040/j.issn.1672-3961.0.2021.113

• • 上一篇

粉土基泡沫轻质土三轴力学特性

张宏博¹,刘明朋¹,孙玉海²,杨强³,宋修广¹,李晓亮⁴

1. 山东大学齐鲁交通学院, 山东济南 250061;2. 山东省交通规划设计院集团有限公司, 山东济南 250031;3. 济南金衢公路勘察设计研究有限公司, 山东济南 250101;4. 山东高速股份有限公司, 山东济南 250014

发布日期:2022-02-21
作者简介:张宏博(1977— ),男,山东金乡人,副教授,博士,主要研究方向为边坡与路基支挡. E-mail:zhanghongbo@sdu.edu.cn
基金资助:
国家自然科学基金资助项目(52002224);山东省重点研发计划资助项目(重大科技创新工程)(2020CXGC010118)

Triaxial mechanical characteristic of the silt-based foamed concrete

ZHANG Hongbo¹, LIU Mingpeng¹, SUN Yuhai², YANG Qiang³, SONG Xiuguang¹, LI Xiaoliang⁴

1. School of Qilu Transportation, Shandong University, Jinan 250061, Shandong, China;
2. Shandong Transportation Planning and Design Institute Co., Ltd., Jinan 250031, Shandong, China;
3. Jinan Jinqu Highway Survey and Design Co., Ltd., Jinan 250101, Shandong, China;
4. Shandong High-Speed Company Limited, Jinan 250014, Shandong, China

Published:2022-02-21

摘要/Abstract

摘要： 引入黄泛区粉土作细集料,介绍一种新的路基填料:粉土基泡沫轻质土。为研究粉土基轻质土的压缩及剪切性能,进行了三轴试验,并考虑围压、湿密度和粉土掺量对力学性能指标的影响。结果显示:三轴试验下的粉土基轻质土的应力-应变曲线符合典型的弹塑性模型,曲线整体上可分为线弹性段、弹塑性段及应力平台阶段;粉土基轻质土的破坏形态在低围压下符合典型的剪切破坏特性,但是当围压较高时多呈端部压碎破坏;围压的增大使得峰值应力增大,但粉土掺量的增大则会降低峰值应力,密度与峰值应力可以近似用指数函数模拟。通过摩尔-库伦强度准则研究粉土基轻质土的抗剪强度,结果显示,粉土基轻质土是一种抗剪性能良好的材料,其内摩擦角与黏聚力随密度提高很大,但是粉土的掺入会降低抗剪性能。基于试验数据,采用椭圆屈服面拟合粉土基轻质土的屈服点,建立了屈服面参数与湿密度与粉土掺量的经验性关系。

关键词: 粉土, 三轴试验, 应力应变特征, 峰值应力, 抗剪强度, 屈服面模型

中图分类号:

TU525.9

张宏博,刘明朋,孙玉海,杨强,宋修广,李晓亮. 粉土基泡沫轻质土三轴力学特性[J]. 山东大学学报 (工学版), 2022, 52(1): 39-46.

ZHANG Hongbo, LIU Mingpeng, SUN Yuhai, YANG Qiang, SONG Xiuguang, LI Xiaoliang. Triaxial mechanical characteristic of the silt-based foamed concrete[J]. Journal of Shandong University(Engineering Science), 2022, 52(1): 39-46.

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粉土基泡沫轻质土三轴力学特性

Triaxial mechanical characteristic of the silt-based foamed concrete

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