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工程中所遇到的土体大多数以非饱和土形态存在。以海南地区的特殊土红粘土为研究对象,在对其进行土—水特性研究的基础上,认为Van Genuchten模型较好地反映了海南红粘土饱和度与基质吸力的关系。结合Bishop提出的非饱和土的有效应力表达式,分析了降雨及蒸发下地裂缝的发展机制。通过数值算例发现,在非饱和土中,静止土压力系数不再保持不变,而是随着深度和稳定流流量的变化而变化,与饱和土中的静止土压力系数的性质有很大不同,这在工程实际中对支挡结构的设计具有重要的指导意义;在非饱和土中,由于静止土压力系数存在负值,容易产生地裂缝,且在蒸发条件下,最大地裂缝深度理论上比在无渗流和降雨条件下的大。
Most of the soil encountered in the project exists in the form of unsaturated soil. Based on the study of soil-water characteristics of special red clay in Hainan, Van Genuchten model is considered to be a good reflection of the relationship between saturation of Hainan red clay and matrix suction. Combined with the effective stress expression of unsaturated soil proposed by Bishop, the development mechanism of ground fissures under rainfall and evaporation is analyzed. Numerical examples show that in unsaturated soil, the coefficient of static earth pressure no longer remains unchanged, but changes with the depth and the steady flow, and the nature of the static earth pressure coefficient in saturated soil is very large Which is of great guiding significance to the design of retaining structure in engineering practice. In unsaturated soil, because of the negative value of the static earth pressure coefficient, it is easy to produce ground fissures. Under the condition of evaporation, the maximum depth of ground crack theory On the condition of no seepage and rainfall.