[1]王贵荣,董 晨,段 钊,等.粗颗粒组分含量对中细砂抗剪强度的影响[J].西安科技大学学报,2020,(01):24-30.
 WANG Gui-rong,DONG Chen,DUAN Zhao,et al.Effect of coarse particle content on shear strength of medium sand[J].Journal of Xi'an University of Science and Technology,2020,(01):24-30.
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粗颗粒组分含量对中细砂抗剪强度的影响(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2020年01期
页码:
24-30
栏目:
出版日期:
2020-02-15

文章信息/Info

Title:
Effect of coarse particle content on shear strength of medium sand
文章编号:
1672-9315(2020)01-0024-07
作者:
王贵荣12董 晨12段 钊12马建全12唐 皓12
(1.西安科技大学 地质与环境学院,陕西 西安 710054; 2.陕西省煤炭绿色开发地质保障重点实验室,陕西,西安 710054)
Author(s):
WANG Gui-rong12DONG Chen12DUAN Zhao12MA Jian-quan12TANG Hao12
(1.College of Geology and Environment, Xi'an University of Science and Technology,Xi'an 710054,China; 2.Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation,Xi'an 710054,China)
关键词:
抗剪强度 粗颗粒 中细砂 级配 直剪试验 岩土改性
Keywords:
shear strength coarse particle medium sand graduation direct shear test rock-soil modification
分类号:
P 642
文献标志码:
A
摘要:
粒径级配决定了砂体颗粒结构特征,影响着砂体的剪切力学行为。为查明粗颗粒组分含量对中细砂抗剪强度的影响,在中细砂中逐级加入粗颗粒组分,配制了5组混合砂样,并对其进行了直剪试验研究。结果表明:随着法向应力的增大,各组混合砂样的抗剪强度也随之增大; 直剪试验中各混合砂样直剪峰值强度后均出现略微软化,随剪切位移的增大又发生硬化; 当法向应力的增大时,各组混合砂样硬化现象更加明显; 在同一法向应力作用下,增加粗颗粒含量,各组混合砂样抗剪强度均表现出先降低后升高的趋势,在粗颗粒含量由0%增加到20%时,混合砂样抗剪强度持续降低,在20%粗颗粒含量时达到最小,之后开始增大; 在不同的级配及法向应力作用下,混合砂样的摩擦系数等强度指标变化均在20%粗颗粒含量时发生改变。
Abstract:
Particle size distribution determines the structural characteristics of sand particles and affects the shear mechanical behavior of sand bodies.In order to find out the influence of coarse particle composition on shear strength of medium fine sand, coarse particle composition was added to medium fine sand step by step.The results show that the shear strength of mixed sand samples increases with the increase of normal stress.In the direct shear test, the mixed sand samples showed weak softening after the peak strength of direct shear, and then hardened with the increase of shear displacement.With the increase of normal stress, the hardening phenomenon of mixed sand samples in each group is more obvious.Under the same normal stress, the shear strength of mixed sand sample decreases first and then increases with the increase of coarse particle content.Under the condition of 20% coarse particle content, the shear strength of mixed sand sample is the minimum.Under different graduation and normal stress, the friction coefficient and other characteristic values of mixed lower sand body change when the coarse particle content is 20%.

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备注/Memo

备注/Memo:
收稿日期:2019-07-04 责任编辑:杨泉林
基金项目:国家自然科学基金(51674193); 陕西省自然科学基础研究计划联合基金(2019JLM-9); 陕西省自然科学基础研究计划(2018JM5152); 中国博士后科学基金(2019M663780)
通信作者:罗振敏(1976-),女,山东兖州人,教授,博士生导师,E-mail:zmluo@xust.edu.com
更新日期/Last Update: 2020-02-15