我国水田土壤流变特性研究(第4版)——土壤条件和载荷条件对水田土壤流变参数的影响及应力-应变-时间图

RHEOLOGICAL CHARACTERISTICS OF PADDY-FIELD SOILS IN CHINA(4)——EFFECTS OF SOIL CONDITIONS AND LOAD CONDITIONS ON RHEOLOGICAL COEFFICIENTS OF PADDY-FIELD SOILS AND STRESS-STRAIN-TIME GRAPH

本文根据对多种水田土壤的正交试验和方差分析,采用Burgers四元件模型作为我国南方水田土壤的通用变流模型,并得出下列结论:这些土壤各流变参数的值,与土壤条件有关,与载荷条件(承载面形状和面积、单位面积载荷)无关。 根据上述原理,作者提出我国南方水田土壤所表征的流变型土壤在一定土壤条件下的应力-应变-时间图,以及当应力在一定范围内时,流变曲线族在应力-应变-时间三维空间内舒展成流变曲面的概念;也提出了将此图应用于行走装置和切削元件研究的设想。

According to orthogonal tests and analysis of variance for several scrts of paddy-field soils, the Burgers 4-element model is accepted as a general model for paddy-field soils in South China, and it is concluded that the rheological coefficients are dependent on soil ccnditions, but independent of load conditions(shape and size of bearing surfaces, load per unit area).The above principle leads to the idea that a stress-strain-time graph of rheological soils, characterized by paddy-field soils in Scuth China, may be developed un-der definite soil ccnditions, and a rheological surface is generated in the 3-dimensio-nal space of stress, strain and time by rheological curves when stresses are limited within a definite range. It is also expected that this graph may be of some benefit to the traction and tillage research.