岳阳地区典型黏性土地基抗剪强度指标经验公式研究

针对岳阳地区典型的黏性土地基，进行了不同排水条件下的直剪试验，获得了大量直剪强度指标试验数据．基于试验数据的整理，提出了抗剪强度指标归一化参数的概念及定义式；对不同条件下的归一化参数分析表明，影响该参数的主要因素是液性指数，并给出了4个归一化参数随液性指数的变化曲线和相应的经验公式．基于归一化参数及快剪强度指标，可计算出更耗时的固结快剪、固结慢剪抗剪强度指标．本文研究思路和经验公式可为岳阳地区典型黏性土地基抗剪强度指标的确定提供新的途径，该方法可推广至其它地区或其它类型地基土的抗剪强度指标的确定．

Study on Empirical Formula of Shear Strength Index of Typical Clayey Foundation in Yueyang Area

In view of the typical clayey foundation of Yueyang area, conducting direct shear test under different drainage condition, large test data of direct shear intensity index was acquired. Based on analysis of test data, the concept and definition of shear strength index of normalized parameter were put forward for the first time; the analysis of normalized parameter under different condition indicates that liquidity index is main factor influencing the parameter and four normalized parameter along with the change of liquidity index curve and corresponding empirical formula were given. Based on normalized parameter and quick shear strength index, shear strength index of more time-consuming consolidated quick shear and consolidated slow shear can be figured out. The research ideas and empirical formula of this thesis not only can be served for providing new way of confirmation the shear strength index of typical clayey foundation in Yueyang area, also can be generalized to determine the shear strength index of other types of foundation soil and other area.