粘土沙的未排水切割行为具有恒定状态参数,考虑到初始应力异性质效应
Peipei Li1, Chen Zhu1, Xiaodong Pan1
1College of Civil Engineering, Zhejiang University of Technology, Hangzhou, 310014, China.
Scientific reports
|January 26, 2024
概括
状态参数 (ψ) 比空隙比率更好地预测砂混合物的行为. 添加10%的细增强了扩张和剪切强度,但初始应力异构性可以降低强度并改变刚度.
科学领域:
- 地质技术工程 地质技术工程
- 土壤力学 土壤力学
- 土木工程 土木工程是指土木工程.
背景情况:
- 天然沙子沉积物通常含有非塑料细,并受到异性压力.
- 了解这些条件下的土壤行为对于基础设施发展至关重要.
研究的目的:
- 为了研究初始应力异构对干净和泥沙混合物的未排水切割行为的影响.
- 为了评估状态参数 (ψ) 在描述砂细混合物的有效性.
主要方法:
- 在沙子样本上进行了三轴压缩测试,其细分含量 (fc) 从0%到20%不等.
- 测试是在100kPa的初始平均有效应力 (p0) 下进行的,并具有不同的巩固条件.
- 分析了初始静态应力比率 (ηs) 对剪切强度和刚度的影响.
主要成果:
- 状态参数 (ψ) 证明是土壤反应的优越预测因子,与空隙比率或相对密度相比.
- 10%的精细含量 (fc=10%) 导致在恒定的 ψ (-0.03) 时获得最高的扩张和剪切阻力.
- 较高的静态应力比率 (ηs) 一般会降低剪切强度,而负的 ηs会增加度,正的 ηs会降低度.
结论:
- 状态参数 (ψ) 是一个强大的指标,用于在异性压力下的砂细混合物.
- 最佳的细菌含量 (约10%) 可以提高土壤的强度和扩张性.
- 初始应力异质性显著影响剪切强度和度,影响因应力比率的标志而有所不同.
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