摘要
为了研究粤西北地区花岗岩残积土的抗剪强度特性,对74组花岗岩残积土的原状土及用作比较的重塑土进行了室内物理指标试验和室内直剪试验。结果表明:花岗岩残积土具有显著的区域差异性,兼具黏性土和砂土的特性,其黏聚力较大,内摩擦角较小;原状土的黏聚力高于重塑土,而两者的内摩擦角基本相同;重塑土和原状土的黏聚力都随着含水率的增加呈现出非线性减小并趋于稳定的变化趋势,但内摩擦角则随着含水率的增加在11°~16°的范围内波动,与含水率几乎无相关性;花岗岩残积土的黏聚力受颗粒组成、含水率、孔隙比等因素的综合影响,造成不同地点原状土的黏聚力和含水率之间的相关性不明显。该结论可为粤西北地区花岗岩残积土边坡的设计提供参考。
In order to study the shear strength characteristics of granite residual soils in northwest Guangdong,laboratory physical index tests and direct shear tests were carried out on 74 groups of undisturbed granite residual soils and remolded soils for comparison.From the test results,some insights can be obtained as follows.The regional differences of granite residual soil are significant,and it has both the characteristics of cohesive soil and sandy soil,with large cohesion and small internal friction angle.The cohesion of undisturbed granite residual soil is higher than that of remolded soil,but the internal friction angle of undisturbed soil and remolded soil is basically the same.The cohesion decreases nonlinearly with the increase of water content,and there is no obvious correlation between the internal friction angle and the water content,and fluctuates in the range of 11°~16°with the water content.The cohesion of granite residual soil is comprehensively affected by particle composition,water content,void ratio and other factors,resulting in no obvious correlation between the cohesion and water content of undisturbed soil in different locations.This conclusion can provide a reference for the design of granite residual soil slopes in northwest Guangdong.
作者
崔喜友
宋常军
邵嘉波
徐凤银
肖业铎
刘文劼
CUI Xiyou;SONG Changjun;SHAO Jiabo;XU Fengyin;XIAO Yeduo;LIU Wenjie(China Highway Engineering Consulting Corporation,Beijing 100089,China;Road Research Centre,Research Institute of Highway Ministry of Transport,Beijing 100088,China;Hunan Communications Research Institute Co.,Ltd.,Changsha,Hunan 410015,China)
出处
《公路工程》
2024年第1期131-138,共8页
Highway Engineering
基金
中国公路工程咨询集团有限公司科技研究开发计划课题项目(ZZJT-GLGS-JS-202102)
湖南省交通科技项目(202214)
贵州省交通运输厅科技项目(2021-122-046)。
关键词
花岗岩残积土
原状土
重塑土
抗剪强度指标
直剪试验
含水率
granite residual soil
undisturbed soil
remodeled soil
shear strength index
direct shear test
moisture content
