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以天津滨海新区软土为研究对象,为了更准确地获得土体不排水抗剪强度Cu,进行了大量的扁铲侧胀试验。并用国内外已有的经验公式,计算了土体的不排水抗剪强度。通过与相邻位置十字板剪切试验结果对比,对已有经验公式在天津滨海新区软土的适用性进行了验证。结果表明,扁铲侧胀试验具有一定的地域性,使用经验公式时需要结合地区土性进行验证或修正。对于天津滨海新区ID≤0.35的软土,采用Lacass和Lunne(1988)提出的计算Cu的公式,当系数取0.17时进行计算适用性较好。
Taking the soft soil of Tianjin Binhai New Area as the research object, a lot of flat dilatometer tests were conducted in order to get the undrained shear strength Cu of the soil more accurately. The undrained shear strength of soil is calculated by using the existing empirical formula at home and abroad. By comparing with the results of the cross-shear test at the adjacent location, the applicability of the existing empirical formula to the soft soil in Tianjin Binhai New Area was verified. The results show that the flat dilatometer test has some regional characteristics. When using the empirical formula, it needs to be verified or corrected according to the local soil properties. For the soft soil with ID≤0.35 in Tianjin Binhai New Area, the formula for calculating Cu proposed by Lacass and Lunne (1988) is adopted. When the coefficient is taken as 0.17, the applicability is better.