洞庭湖软土特性原位测试对比分析  

Comparative In-Situ Study of Soft Soil in Dongting Lake

作　　者：张鹏 马德青 邬远明 ZHANG Peng;MA Deqing;WU Yuanming(Hunan Provincial Communications Planning,Survey&Design Institute Co.Ltd.,Changsha 410219)

机构地区：[1]湖南省交通规划勘察设计院有限公司,长沙410219

出　　处：《土工基础》2020年第3期376-379,共4页Soil Engineering and Foundation

摘　　要：在洞庭湖区,要对软土地基岩土体提出准确有效的力学参数,原位测试是一种不可或缺的手段,但不同的原位测试手段在不同地区有其不同的适应性,选取一种最佳的原位测试方法是必须考虑的问题。在两种不同沉积相的软土区域进行了原位测试对比研究,研究表明,静力触探试验成果规律性强,成果准确;十字板剪切试验成果离散,对地层要求较高;扁铲侧胀试验可利用经验公式在洞庭湖区适用性差,计算成果偏差大。建议在洞庭湖区软土勘察中,原位测试采用以静力触探为主,十字板剪切试验作参考,布置部分扁铲侧胀试验以获取地区经验数据。In situ test methods have advantages in testing different soil parameters of soft soils.The accuracy and effectiveness of these in-situ testing methods are related to their structural characteristics;geological conditions,and testing experience of the operator.In Dongting Lake soft soil area,the in-situ testing methods are very important tools for the soil property characterization,and it is also equally important to select the appropriate testing device for the certain soil parameter.This paper presents the comparative study results of wo soft soil with different deposition origin using different in-situ testing devices.The results indicate that,the cone penetration test(CPT)results are repetitive and more accurate.Diverse results are obtained in using vane shear testing device;the empirical formula for flat dilatometer in Dongting soft soil has scattered results and are not reliable.It is concluded that the CPT should be mainly used for the soft soil characterization and compensated by vane shear device.Plat dilatometer should be used for the purpose of experience accumulation.

关 键 词：洞庭湖 软土特性 原位测试 对比 

分 类 号：TU413[建筑科学—岩土工程]