结构扰动性软土静力触探的小孔扩张力学模型研究  

STATIC CONE PENETRATION MECHANICS MODEL OF SOFT SOIL CONSIDERING STRUCTURAL DISTURBANCE

作　　者：黄橙 胡希光 刘玉石 张宗岭 涂佳黄[3] HUANG Cheng;HU Xiguang;LIU Yushi;ZHANG Zongling;TU Jiahuang(CCCC Urban-Rural Development Construction Co.Ltd.,Beijing 101300,China;Hubei Zhongchengxiang Xiangyue Real Estate Development Co.Ltd.,Wuhan 430056,China;College of Civil Engineering,Xiangtan University,Xiangtan 411105,Hunan,China)

机构地区：[1]中交城乡开发建设有限公司,北京101300 [2]湖北中城乡香樾房地产开发有限公司,武汉430056 [3]湘潭大学土木工程学院,湖南湘潭411105

出　　处：《力学与实践》2024年第6期1242-1250,共9页Mechanics in Engineering

摘　　要：建立了考虑土体扰动的小孔扩张力学模型,研究软土地层中静力触探比贯入阻力与土层力学参数的关联性。通过静力触探结果分析,结合小孔扩张理论,构建了比贯入阻力与弹性模量、泊松比、黏聚力、内摩擦角及土体灵敏度间的关系模型。工程现场的淤泥质软土层变异性小,测点数据具代表性,可用于理论比对计算。验证表明,模型可准确描述比贯入阻力与力学参数间的关系,在高灵敏度土体中,受扰动土体的挤压作用增强,比贯入阻力增大。This study establishes a mechanical model of circular hole expansion considering soil disturbance to investigate the correlation between the specific penetration resistance of static cone penetration testing and the mechanical parameters of soft soil layers.By analyzing the data from single-bridge static cone penetration tests and combining with the theory of circular hole expansion,a relationship model between the specific penetration resistance and the elastic modulus,Poisson's ratio,cohesion,internal friction angle,and soil sensitivity is constructed.The variability of the silt-muddy soft soil layer at the background engineering site is small,and the measured data is representative for theoretical comparison calculations.The validation results indicate that the model can accurately describe the relationship between the specific penetration resistance and mechanical parameters,especially in high-sensitivity soil where the compression effect of disturbed soil is enhanced,leading to an increase in the specific penetration resistance.

关 键 词：静力触探 软土 比贯入阻力 灵敏度 小孔扩张理论 

分 类 号：O39[理学—工程力学]