扁铲侧胀试验求解天津软土不排水抗剪强度  

Undrained shear strength of Tianjin soft soil obtained from flat dilatometer tests

作　　者：卢力强[1,2] 杜东菊 杨爱武[1,2] 赵瑞斌[1,2] 张彦[1] 

机构地区：[1]天津城市建设学院,天津300384 [2]天津市软土特性与工程环境重点实验室,天津300384

出　　处：《工程勘察》2011年第2期12-15,33,共5页Geotechnical Investigation & Surveying

基　　金：天津市科技计划项目(06YFGZSF04000)

摘　　要：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 the soft soil in Tianjin Binhai New Area as the study object,a large number of flat dilatometer tests have been done in order to obtain the more accurate undrained shear strength（Cu） of the soil.The undrained shear strength is calculated by using the domestic and overseas experience formulas,and the applicability of the experience formulas is validated by the contrast with the values of the field vane tests.The results show that there is the regional feature about flat dilatometer tests,and the empirical formulas should be verified or corrected by combining the properties of the regional soils.For the soft soil in Tianjin Binhai New Area（ID≤0.35）,the formula which was put forward by Lacass and Lunne（1988） is appropriate when the coefficient is elected as 0.17.

关 键 词：扁铲侧胀试验 不排水抗剪强度 十字板剪切试验 天津软土 

分 类 号：TU413[建筑科学—岩土工程]