摘要
碎石土滑坡是最常见的滑坡地质灾害之一,严重威胁山区的基础设施和当地居民的生命财产安全。碎石土滑坡形成机理得到了广泛研究,但是块石形状对碎石土边坡稳定性的影响却很少被关注。该文通过系统梳理块石形状对碎石土力学特性影响的研究,为后续直剪试验和边坡模型试验提供明确研究目标,其中块石形状对碎石土力学特性的影响所揭示的颗粒形状影响规律,直接指导试验参数设计。采用多种分析方法,研究了含有圆形、正方形、正六边形和正八边形块石的碎石土的力学特性,并模拟分析了降雨条件下不同块石形状的碎石土边坡的稳定性。研究发现,不同形状的块石颗粒在剪切应力、剪切位移、平面剪切应变和偏应力方面存在显著差异,其中相同剪切位移下圆形块石颗粒的剪切应力最小,而正方形块石颗粒的剪切应力最大。当围压相同时,圆形、正八边形、正六边形和正方形块石颗粒的抗剪强度依次增大,其中正方形块石颗粒的偏应力增长最快。通过三轴模型试验发现,含有长方体块石的碎石土边坡位移最小,含立方体块石的碎石土边坡位移居中,而含球体块石的碎石土边坡位移最大,这表明块石的颗粒形状显著影响边坡的稳定性。
Gravel soil landslides are one of the most common geological disasters,posing a significant threat to infrastructure and the safety of local residents\lives and property in mountainous regions.The formation mechanisms of gravel soil landslides have been widely studied,however,the impact of the shape of block stone on the stability of gravel soil slopes has received little attention.This paper systematically reviews the impact of block stone shape on the mechanical properties of gravel soil,providing clear research objectives for subsequent direct shear tests and slope model experiments,as revealed by the study,directly guides the design of experimental parameters.This study uses various analytical methods to examine the mechanical properties of gravel soil containing circular,square,hexagonal,and octagonal stones,and simulated the stability of slopes with these shapes under rainfall conditions.The results show notable differences in shear stress,displacement,shear strain,and deviatoric stress,with circular stones having the lowest shear stress and square stones having the highest shear stress under the same shear displacement.Under the same confining pressure,shear strength increases in the order of circular,octagonal,hexagonal,and square stones,with square stones exhibiting the fastest increase in deviatoric stress.Triaxial tests reveal that slopes with rectangular stones experience the least displacement,cubic stones moderate displacement,and spherical stones the most,this indicates that block stone shape significantly influences slope stability.
作者
张亚军
罗小双
陈红
杜小虎
刘诚
周阳
邱洪志
刘瑞
ZHANG Yajun;LUO Xiaoshuang;CHEN Hong;DU Xiaohu;LIU Cheng;ZHOU Yang;QIU Hongzhi;LIU Rui(Hubei Provincial Road&Bridge Group Co.,Ltd.,Wuhan 430100,China;School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China;Sichuan Testing Centre for Construction Engineering Quality Limited,Chengdu 610000,China)
出处
《四川建筑科学研究》
2025年第6期55-63,共9页
Sichuan Building Science
基金
四川省科技计划资助项目(2024NSFSC0926)。
关键词
碎石土
块石形状
力学特性
模型试验
稳定性分析
gravel soil
shape of block stone
mechanical property
model test
stability analysis
