浙江地区含硅藻类黏性土的工程性质研究

Study on Engineering Properties of Diatom-containing Clayey Soils in Zhejiang

近年来随着大型工程的建设,基础越来越多地向地下深部地层延伸,在浙江地区深部地层经常会遇到一种类似Q4年代的黏性土,含有硅藻类化石,具有与常规软黏性土不一样的物理力学性质,在外力作用下会出现强度突然下降和变形突然增大的现象,对工程安全造成不利影响。通过浙江地区某项目,对此类含硅藻类黏性土从微观结构、矿物组成和室内土工试验等方面进行研究,总结其工程特性,为工程建设提供有益的参考。

In recent years, with the construction of large-scale projects, the foundation is increasingly extended to the deep underground strata. The deep strata in Zhejiang often encounters a kind of clayed soil similar to the Q4 era, which contains the diatom fossils and has the physical and mechanical properties different from the conventional soft clayed soils. There will be a sudden decrease in strength and a sudden increase in deformation under the action of external forces, which will adversely affect the safety of the project. Through a project in Zhejiang, such diatom-containing clayed soils are studied from the aspects of microstructure, mineral composition and laboratory geotechnical tests, and the engineering characteristics are summarized to provide a useful reference for the engineering construction.