滇西南某高速公路花岗岩残积土工程地质特性研究

Engineering Geological Characteristics of Granitic Residual Soils in a Highway Project in Southwest Yunnan

云南地区花岗岩残积土分布十分广泛,其工程地质特征对工程影响很大。对滇西南地区某高速公路沿线分布的花岗岩残积土层的物理力学性质进行了研究,分别从粗粒含量、最优含水率、CBR值以及现场动力触探试验分析了它的工程适用性,最后对其工程应用给出了治理措施及建议:①应以最大CBR值对应的含水率作为碾压控制含水率,可在施工现场准备大型翻晒场地,避免雨季施工,在施工完成后应及时封面和施工坡面防护。②分布在填方基底或低填浅挖路段时,进行换填处理。

Granitic residual soils are widely distributed in Yunnan Province and their engineering geology properties have a great influence on the engineering properties due to their unique geological characteristics.This paper presents the physical and mechanical properties of the granitic residual soils in a highway project in the southwest Yunnan Province.The feasibility of using this material was evaluated from many aspects,such as,coarse grain content,optimum moisture content,CBR values and in-situ dynamic cone penetration tests.Suggestions and recommendations of using this material has also presented in this paper.