在K0值的特征和使用三轴测试的loess的剪切行为上
Xin Liu1, Xinyu Xu2, Liang Huang2
1School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China. xliu67@chd.edu.cn.
Scientific reports
|May 29, 2024
概括
这项研究调查了压缩土中静止时的侧面地压系数 (K0). 结果显示K值范围从0.28到0.53,影响未排水的剪切行为并显示收缩反应.
科学领域:
- 地质技术工程 地质技术工程
- 土壤力学 土壤力学
- 地球科学 地球科学 地球科学
背景情况:
- 有限的数据存在于横向地压在休息的系数 (K0) 对于土与传统土壤如沙子和粘土相比.
- 了解K0对于预测现场应力状态和随后的土壤行为至关重要.
研究的目的:
- 为了实验性地研究在压缩的岩层中静止时的侧面地球压力系数 (K0).
- 分析K0巩固对loess的未排水剪切行为的影响.
- 为了确定K0,包装密度和压缩的粘土含量之间的关系.
主要方法:
- 在三轴系统内使用K0整合模块,具有独特的反控制,以实现K0压力状态.
- 监测的偏差应力 (q) 增加与体积应力 (εv) 相比,在K0巩固期间等于轴向应力 (εa).
- 在K0合并样上进行了无排水切削试验,以观察应力路径和量化可折叠性.
主要成果:
- 确定K0值的压缩介于0.28到0.53之间,受包装密度和粘土含量的影响.
- 在松散压缩样本的整合过程中观察到K0的下降,但对于密集样本并非如此.
- 所有标本在应力路径 (q-p') 图中都表现出收缩行为,K0整合样本显示的折叠率指数 (Ic) 比同位素样本高.
结论:
- 最初的应力状态显著影响压缩的剪切行为.
- K0值对的物理性质敏感,特别是密度和粘土含量.
- K0的整合导致了缩反应的增加和缩性.
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