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颗粒粒径和结构物表面粗糙度是影响结构物-砂土界面力学特性的重要因素，利用自行改进的直剪仪，开展了不同纹理深度与粒组影响下的钢-砂界面单调直剪试验，分析了界面剪切应力与剪切位移的关系、界面峰值剪切应力变化机理及界面抗剪强度指标变化规律。结果表明：粒组0.075～0.25 mm和0.25～0.5 mm的界面峰值剪切应力随纹理深度的增大呈现先增加后减小的变化规律，粒组0.5～2 mm的界面峰值剪切应力随纹理深度的增大而增加；利用多元非线性模型预测了不同试验条件下的界面抗剪强度，不同纹理深度下抗剪强度的不同与纹理内参与界面剪切的颗粒数量、纹理能否与颗粒形成嵌锁作用有关，因纹理深度与粒径的不同，分布于纹理内的颗粒分为参与界面剪切的主要颗粒、次要颗粒和未受剪切影响的颗粒；不同粒组的界面摩擦角随纹理深度的变化规律与界面峰值剪切应力保持一致。
Abstract：As particle size and structure surface roughness are important factors affecting the mechanical properties of the structure-sand interface, the monotonic direct shear tests on steel-sand interface under different effects of groove depth and particle group are carried out with the self-improved direct shear apparatus, and then the relationship between the shear stress and shear displacement of the interface, the changing mechanism of the interface peak shear stress and the changing law of the interface shear strength index are analyzed. The results show that the interface peak shear stresses of both the particle groups of 0.075～0.25 mm and 0.25～0.5 mm exhibit the changing laws of increasing at first and then decreasing with the increase of the groove depth, while the interface peak shear stress of the particle group of 0.5～2 mm is increased with the increase of the groove depth. The interface shear strengths under different test conditions are predicted with the relevant multivariate nonlinear model. The differences of the shear strengths under different groove depths are related to the number of the particles inside the groove participating in interface shearing and that whether the groove can form interlocking effect with particles. As the groove depth is different to particle size, the particles distributed inside the groove are divided into the main particles involved in interfacial shear, the minor particles and the particles not affected by shear, while the interface friction angles of different particle groups are consistent with the peak shear stresses at the interface with the changing laws of the groove depths.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2022.09.018
中图分类号:TU473.1
引用信息:
[1]马永明,郭聚坤,左珅,等.粒径与纹理深度对钢-砂界面剪切性状的影响研究[J],2022,53(09):186-196.DOI:10.13928/j.cnki.wrahe.2022.09.018.
基金信息:
山东省自然科学基金青年项目(ZR2020QE257);; 山东省交通运输科技项目(2020B23);; 潍坊市高新区科技惠民计划项目(2021KJHM29)