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软土土性指标作为软基处理设计的基本参数,其变化具有很强的地域特征和显著的不确定性。目前,对软土土性指标统计分析集中在软土物理力学指标的相互关系和分布规律等方面,采用的样本为室内试验和原位测试数据,没有考虑不同试验方法对土性指标不确定性分析的影响。将天津软土作为一个独立的统计单元体,研究了该地区软土物理力学指标的变化范围、变异性、指标间的相互关系和各指标的概率分布模型,得到了天津软土物理指标与压缩指标、强度指标间的统计关系经验公式以及土性指标的概率分布模型;并分析了直剪试验、三轴试验、十字板剪切试验3种不同方法抗剪强度试验结果的相互关系,提出了利用随机因子分析法对试验方法不确定性进行概率评定。研究成果为软土地区工程土工参数的取值提供了依据和参考。
As a basic parameter of soft ground treatment design, soft soil index has strong regional characteristics and significant uncertainties. At present, the statistical analysis of soft soil index focuses on the correlation and distribution law of physical and mechanical indexes of soft soil. The samples used are indoor test and in-situ test data, without considering the uncertainty of different test methods Analysis of the impact. Taking Tianjin soft soil as an independent statistical unit, this paper studies the range, variability, the interrelationship between indices and the probability distribution model of each index of physical and mechanical properties of soft soil in this area. The physical indices and compression of Tianjin soft soil The empirical formula of statistical relation between strength index and the probability distribution model of soil index, and the relationship between the shear strength test results of three different methods of direct shear test, triaxial test and cruciform shear test are analyzed Uses random factor analysis to evaluate the uncertainty of test method. The research results provide the basis and references for the value of engineering geotechnical parameters in soft soil area.