王贵荣;董晨;段钊;马建全;唐皓;

• 1:西安科技大学地质与环境学院
• 2:陕西省煤炭绿色开发地质保障重点实验室

摘要(Abstract)：

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。

关键词(KeyWords)： 抗剪强度;粗颗粒;中细砂;级配;直剪试验;岩土改性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(41702298,41602359);; 陕西省自然科学基础研究计划(2017JQ4020);; 陕西省教育厅专项科研计划(17JK0515)

作者(Author): 王贵荣;董晨;段钊;马建全;唐皓;

Email:

DOI: 10.13800/j.cnki.xakjdxxb.2020.0104

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