滑带土化学矿物成分与抗剪强度的关联分析  

CORRELATION ANALYSIS OF CHEMICAL AND MINERAL COMPOSITION WIH SHEAR STRENGTH OF SLIP ZONE SOIL

作　　者：谢万烨 刘才铭 晏长根[1] 常洲 贾卓龙 石玉玲[3] XIE Wanye;LIU Caiming;YAN Changgen;CHANG Zhou;JIA Zhuolong;SHI Yuling(School of Highway,Chang'an University,Xi'an 710064,China;Shandong Provincial Communications Planning and Design Institute Co.,Ltd.,Jinan 250000,China;School of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,China)

机构地区：[1]长安大学,公路学院,西安710064 [2]山东省交通规划设计院集团有限公司,济南250000 [3]长安大学,地质工程与测绘学院,西安710054

出　　处：《工程地质学报》2025年第1期86-95,共10页Journal of Engineering Geology

基　　金：国家自然科学基金项目(资助号:42077265);甘肃省交通运输厅科技项目(资助号:2022-15).

摘　　要：为了从微观和宏观角度揭示黄土-泥岩二元边坡滑坡形成机理,对上覆黄土、下伏泥岩和滑带土开展了三轴剪切试验、可溶盐成分测试和矿物含量测定等试验,分析试样破坏模式、抗剪强度随含水率变化规律,采用灰色关联法确定滑带土抗剪强度与可溶盐成分和矿物成分的相关性,探究滑带土微观结构与宏观强度之间的内在关系。结果表明:滑带土主要破坏模式为剪胀破坏,这与其内部晶体结构密切相关;随着含水率增加,试样抗剪强度参数呈下降趋势,内摩擦角下降程度大于黏聚力。滑带土的峰值强度和黏聚力与K^(+)+Na^(+)和SO_(4)^(2-)含量的关联度大于0.8,表现出较大相关性,内摩擦角与HCO_(3)^(-)和K^(+)+Na^(+)含量的关联度大于0.7,有较大关联。在矿物成分方面,滑带土的峰值强度和黏聚力主要受碱长石、黏土矿物和斜长石含量的影响,内摩擦角主要受黏土含量和石英的影响。黏土矿物成分分析表明,滑带土峰值强度、黏聚力和内摩擦角主要受伊利石和绿泥石含量的影响,其中伊利石对滑带土内摩擦角的影响显著。本文研究成果可为黄土-泥岩二元结构边坡滑坡预警研究提供一定参考。To reveal the formation mechanism of the loess-mudstone dual slope landslide from the micro and macro structures,triaxial shear tests,determination of soluble salt composition,and mineral content were carried out for the overlying loess,underlying mudstone,and sliding zone soil.The macro-phenomena were studied from the failure mode of the soil and the law of shear strength changing with water content.The grey correlation method was used to determine the correlation between the shear strength of the slip zone soil and soluble salt and mineral components to explore the internal relationship between the microstructure and macro strength of the slip zone soil.The main failure mode of the slip zone soil is dilatancy,which is closely related to its internal crystal structure.With the increase of water content,the shear strength parameters of the soil showed that the decreasing of the internal friction angle was greater than the cohesion.The correlation between peak strength and cohesion and K^(+)+Na^(+)and SO_(4)^(2-)content is greater than 0.8,displaying a greater correlation.The correlation between the internal friction angle and HCO_(3)^(-)and K^(+)+Na^(+)content is greater than 0.7,reflecting a greater correlation.In terms of the whole rock mineral combination of the sliding zone soil,the peak strength and cohesion of the sliding zone soil are mainly affected by the content of alkali feldspar,clay minerals,and plagioclase,while the internal friction is mainly affected by the content of clay and quartz.The analysis of clay minerals indicates that the peak strength,cohesion,and internal friction angle of the slip zone soil are mainly affected by the content of illite and chlorite.Illite has a significant effect on the internal friction angle of the slip zone soil.The research results of this paper can provide a reference for the landslide warning research of loess-mudstone dual structure slope.

关 键 词：边坡工程 滑带土 抗剪强度 可溶盐成分 矿物成分 灰色关联 

分 类 号：U416[交通运输工程—道路与铁道工程]