论文部分内容阅读
基于实际工程管沟漏水的情况,考虑黄土地基土体初始含水量、孔隙比、管沟内积水压力等因素影响,给出了二维非饱和黄土地基管沟入渗的有限元计算模型,确定了模型参数,并编制软件对管沟渗水下的黄土地基水分场进行了计算分析。结果表明,土体孔隙比越大,初始含水量越大,入渗速度越快,地基增湿区域越大,但随着增湿区域的增大,入渗水量扩散作用增强,饱和区域反而减小。土体孔隙比越小,初始含水量越小,入渗速度越慢,地基增湿区域越小,显示了低饱和密实土体较强的阻水作用,水分难以下渗,主要集中于管沟周围,水分扩散作用较弱,饱和区域反而大。随着时间的增长,入渗增湿范围增加。但当地沟水与地下水连通后,由于入渗通道的形成,地沟水能够更快的进入地下,则增湿范围反而减小。管沟中积水压力的大小对黄土地基水分入渗影响很大,压力越大,入渗越快,增湿范围越大。
Based on the situation of water leakage in pipelines of actual project, the finite element model of pipe infiltration on two-dimensional unsaturated loess foundation is given considering the influence of factors such as initial water content, void ratio and water pressure in pipe trench. The model parameters are determined and software is developed to calculate and analyze the water field of loess foundation under the seepage of pipe trench. The results show that the larger the soil void ratio is, the larger the initial water content is, the faster the infiltration rate is, and the greater the wetting area is. However, as the humidifying area increases, the diffusion of infiltration water increases and the saturated area decreases small. The smaller the soil porosity ratio is, the smaller the initial water content is, the slower the infiltration rate is. The smaller the soil wetting area is, the stronger the water blocking effect of low saturated and dense soils is. Around, the role of water diffusion is weak, instead of large saturated areas. As time goes by, infiltration humidification range increases. However, after the local ditches are connected with the groundwater, due to the formation of the infiltration channel, the ditches can enter the ground more quickly, and the humidification range instead decreases. The size of the water pressure in the ditch has a great influence on the infiltration of water into the loess foundation. The greater the pressure is, the faster the infiltration is and the larger the humidification range is.