考虑接触形式下黄土-泥岩界面剪切特性试验  

Shear characteristics of the soft structural zone of loess-mudstone under different conditions

作　　者：张炳祺 史向阳 许健 黄旭斌 徐德超 ZHANG Bing-qi;SHI Xiang-yang;XU Jian;HUANG Xu-bin;XU De-chao(College of Water Conservancy and Hydropower Engineering,Gansu Agricultural University,Lanzhou 730070,China;Geological Hazards Prevention Institute,Gansu Academy of Sciences,Lanzhou 730000,China;Northwest Engineering Co.,Ltd.,Power China,Xi'an 710065,China)

机构地区：[1]甘肃农业大学水利水电工程学院,兰州730070 [2]甘肃省科学院地质自然灾害防治研究所,兰州730000 [3]中国电建集团西北勘测设计研究院有限公司,西安710065

出　　处：《兰州大学学报(自然科学版)》2025年第2期201-207,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：甘肃省青年科技基金计划项目(22JR5RA773);甘肃省科学院青年基金项目(2024QN-04);陕西省自然科学基础研究计划项目(2023-JC-QN-0578)。

摘　　要：为探索含水质量分数(w(H_(2)O))和界面滑带土掺比对黄土-泥岩界面(LMI)抗剪强度的影响规律,基于直接剪切试验,开展2种接触形式、4种w(H_(2)O)和3种滑带土掺比条件下LMI抗剪强度的试验,并以相同试验条件下黄土、滑带土和泥岩的剪切性能作为对比.结果表明,在相同试验条件下界面接触类型为夹层型的LMI的抗剪强度大于平面型.对于平面型接触界面,不同w(H_(2)O)下,LMI的抗剪强度均低于对照土样.LMI的内摩擦角和黏聚力随着w(H_(2)O)的增大而减小,内摩擦角减小明显.对于夹层型接触界面,随着泥岩占比的增加,LMI的抗剪强度、黏聚力和内摩擦角均呈先增大后减小的趋势.To investigate the effect of water mass fraction (w(H_2O)) and interfacial slip-band soil mixing ratio on the shear strength of the loess-mudstone interface (LMI),an experimental study was conducted using the direct shear test.Examined in the study were the shear strength of LMI under two contact forms,four w(H_2O),and three slip-band soil mixing ratios.The shear performances of loess,slip-band soil,and mudstone were used as comparisons under the same test conditions.The results indicated that,under the same test conditions,the shear strength of the interface contact type was greater than that of the planar type.For the planar contact interface,the shear strength of LMI was lower than that of the control soil samples under different w(H_2O) conditions.The internal friction angle and cohesion of LMI decreased with an increase in w(H_2O),and the internal friction angle decreased significantly.For the interlayer-type contact interface,the shear strength,cohesion,and internal friction angle of LMI exhibited a increasing and decreasing trend with the increase in the mixing ratio of the slip zone soil.

关 键 词：黄土-泥岩界面 直剪试验 抗剪强度 含水质量分数 滑带土掺比 

分 类 号：TU411.3[建筑科学—岩土工程]