土体固结变形对污染物运移行为影响研究进展

污染物在土体中的运移机制包括对流、扩散、弥散、吸附、降解和化学反应等。实际工程中, 自重及上部荷载易使土体产生固结变形。一方面, 污染土的固结变形将引起其中污染物溶液的对流, 另一方面, 随着固结变形的发展, 土的孔隙比、渗透与固结系数随之改变, 污染物在土体中的水动力弥散系数亦随之改变, 进而影响污染物在其中的运移特性。首先对国内外不同变形条件(大变形、小变形)下固结对污染物运移行为影响理论模型进行了综述, 然后比较分析了各类试验研究方法和试验仪器发展, 最后列举了国内外考虑土体固结对污染物运移影响的典型工程案例。

ADVANCES OF EFFECT OF SOIL CONSOLIDATION ON CONTAMINANT TRANSPORT BEHAVIOR

The mechanisms of contaminant transport in soil include advection, diffusion, dispersion, sorption, biological degradation, chemical reaction and so on. In engineering practice, deformation of consolidation will take place due to self-weight of soils and applied load. On the one hand, consolidation of contaminated soils will lead to advection of the contaminated pore fluid. On the other hand, the void ratio and consolidation coefficient of the soil as well as the hydrodynamic dispersion coefficient of the contaminant will also be changed with the development of deformation, which will comprehensively influence the transport behavior of the contaminants. At first, different types of consolidation-induced contaminant transport models including large strain and small strain consolidation models are summarized. Then, different kinds of test methods and equipment are listed and compared. Finally, related engineering application cases are presented.