摘要
为了揭示粗粒土抗剪强度与其颗粒粒径和形状的相关性,进而实现在不开展相关试验的情况下通过颗粒粒径和形状统计指标估算粗粒土的抗剪强度。采用大尺寸的直剪仪对不同粒径的玻璃珠开展室内直剪试验,在此基础上,采用颗粒流离散元软件对相同形状、不同粒径以及相同粒径、不同形状的仿真粗粒土分别开展了仿真直剪试验,揭示颗粒粒径和形状对粗粒土抗剪强度的影响规律;采用多元线性回归的方法,建立了粗粒堆积体内摩擦角与颗粒表面积比、球形度和粒径的函数关系。结果表明:颗粒粒径越大,粗粒土的抗剪强度越大,两者具有较好的二次函数关系;颗粒的球形度共和表面积比可作为影响粗粒土抗剪强度的关键三维形状指标;在不考虑颗粒破碎的情况下,颗粒粒径和颗粒形状与内摩擦角有良好的相关性。研究结果可以用于初步估算粗粒土的抗剪强度,具有一定的实用性。
In order to reveal the correlation between the shear strength of coarse-grained soil and its particle size and shape,it is possible to estimate the shear strength of coarse-grained soil through the statistical indicators of particle size and shape without conducting relevant experiments.The laboratory direct shear test was carried out on glass beads with different particle sizes by using a large-size direct shearing apparatus.The simulated direct shear tests were carried out respectively to reveal the influence of particle size and shape on the shear strength of coarse-grained soils.The method of multiple linear regression was used to establish the relationship between internal friction angle and particle surface to volume ratio,sphericity and particle size.The results show that the larger the particle size,the greater the shear strength of coarse-grained soil,and the two have a good quadratic function relationship.The sphericity to surface area ratio of particles can be used as a key three-dimensional shape index affecting the shear strength of coarse-grained soil.Without considering particle breakage,particle size and particle shape correlate well with the internal friction angle.The results of this study can be used to preliminarily estimate the shear strength of coarse-grained soil,which has certain practicability.
作者
薛明华
鹿传磊
林宇
关鹏
李立辰
XUE Minghua;LU Chuanlei;LIN Yu;GUAN Peng;LI Lichen(Ji'nan Institute of Geotechnical Investigation and Surveying,Ji'nan 250101,China;Harbin Center for Integrated Natural Resources Survey of China,Harbin 150081,China;China University of Geosciences,Wuhan 430074,China)
出处
《粉煤灰综合利用》
CAS
2024年第4期74-80,共7页
Fly Ash Comprehensive Utilization
基金
中国博士后科学基金(2022M712964)
岩土钻掘与防护教育部工程研究中心实验室开放项目(202203)。
关键词
颗粒形状
剪切强度
粗粒土
离散元
particle shape
shear strength
coarse-grained soil
discrete element method
作者简介
薛明华(1984-),男,硕士,高级工程师,研究方向:岩土工程勘察、设计;通信作者:关鹏(1988-),男,博士(后),讲师,研究方向:岩土工程勘察、设计。
