摘要
为查明人工混合碎石土抗剪强度、残余强度等力学特性,为高填方边坡的稳定分析提供依据,以某大型填方边坡工程为依托,开展原位密度试验和现场剪切试验,研究了不同土石配比的人工碎石土的密度、抗剪强度、残余强度。结果表明:碎石土的密度受碎石含量及颗粒级配的影响,碎石含量高时密度反而偏低,在采用人工拌合碎石土时合理控制颗粒级配,有利于提高土体的密实度;剪切应力-剪切位移曲线呈现出上升阶段、达到峰值后逐渐下降阶段、稳定阶段3个阶段;不同的土石比,法向应力越大,峰值强度时的对应剪切位移越大,反之则越小。
In order to investigate the mechanical properties such as the shear strength and the residual strength of the artificially prepared gravely soils,and to provide a basis for the stability analysis of high fill slopes,the in-situ density tests and on-site direct shear tests are conducted in a large fill slope project to study the density,the shear strength,and the residual strength of the artificial prepared gravely soils with different soil-gravel ratios.The results show that the density of gravely soils is influenced by the content and the particle gradation of crushed stones,and when the content of the crushed stones is high,the density is actually lower.Appropriate control of the particle grading when manually mixing crushed stone soil is beneficial for improving the compactness of the soil mass.The shape of the direct shear stress-shear displacement presents three stages:an upward stage,a gradually decreasing stage after reaching its peak,and a stable stage;The higher the normal stress,the greater the corresponding direct shear displacement at the peak strength for different soil-gravel ratios,and vice versa.
作者
王鸿运
周培峰
王宗魁
WANG Hongyun;ZHOU Peifeng;WANG Zongkui(WSGRI Engineering&Surveying Co.Ltd.,Wuhan 430080)
出处
《土工基础》
2025年第3期486-489,共4页
Soil Engineering and Foundation
关键词
现场剪切试验
原位密度试验
抗剪强度参数
土石比
Field Direct Shearing Test
In-Situ Density Test
Shear Strength Parameters
Soil-Gravel Ratio
