岩土强度参数选取方法研究及工程应用  

Research on the Selection Method of Rock and Soil Strength Parameters and Its Engineering Application

作　　者：贾刚 JIA Gang(Anhui Headquarters of China Building Materials Industry Geological Survey Center,Hefei 230088,China)

机构地区：[1]中国建筑材料工业地质勘查中心安徽总队,合肥230088

出　　处：《建材世界》2023年第4期105-109,共5页The World of Building Materials

摘　　要：为解决岩土勘察中强度指标的确定问题,以肥东县牌坊乡赵坊新村安置小区岩土工程勘察为研究背景,在分析场区岩土工程地质特征的基础上,采用室内试验和原位测试的方法获取各层土体的力学强度参数,并运用数理统计方法对各层土的力学指标进行处理,研究力学强度参数的概率密度分布,用于指导实际岩土工程强度参数的确定。结果表明,基于各土层的强度指标统计结果及概率密度曲线分析,表明各土层的土体性质较为均匀,强度参数变化稳定,空间变异较小,可将黏聚力和内摩擦指标作为岩土强度特性评价的基础参数;对静力触探试验比贯入阻力与室内土工试验内摩擦角和黏聚力建立拟合关系表明,静力触探试验比贯入阻力与室内土工试验内摩擦角和黏聚力均具有良好的线性拟合关系,且拟合系数R 2均大于0.90。In order to solve the problem of determining the strength index in geotechnical survey,based on the geotechnical survey of Zhaofang New Village Resettlement Community,Memorial Archway Township,Feidong County,and on the basis of analyzing the geotechnical engineering geological characteristics of the site,the mechanical strength parameters of each layer of soil were obtained by indoor tests and in-situ test.And the mechanical indexes of each layer of soil were processed by the mathematical statistics method to study the probability density distribution of the mechanical strength parameters,which used to guide the determination of actual geotechnical strength parameters.The results show that based on the statistical results of strength indicators and probability density curve analysis of each soil layer,the soil properties of each soil layer are relatively uniform,the changes in strength parameters are stable,and the spatial variation is small.The cohesion and internal friction indicators can be used as the basic parameters for evaluating the strength characteristics of rock and soil.The establishment of a fitting relationship between the specific penetration resistance of static penetration test and the internal friction angle&cohesion of indoor soil tests indicates that there is a good linear fitting relationship between the specific penetration resistance of static penetration test and the internal friction angle&cohesion of indoor soil tests,and the fitting coefficients R 2 are all greater than 0.90.

关 键 词：岩土强度参数 黏土 比贯入阻力 内摩擦角 黏聚力 

分 类 号：TU41[建筑科学—岩土工程]