土石坝渗漏通道电场分布规律研究

Investigation on Electric Field Distribution Laws of Earth-rock Dam Leakage Passages

为研究土石坝渗漏通道电场分布规律,首先通过土石串联-并联混合结构模型推导了土石复合介质的电阻率;其次将土石坝渗漏通道进行模型概化,推导了概化后渗漏通道内外的电场分布;再结合土石复合介质电阻率求取了土石坝渗漏通道概化后模型的电场分布,获得了渗漏通道内外电场分布响应规律;最后将点源电场作用下不同土石比复合介质在不同含水率、不同孔隙率条件下的电场分布规律通过有限单元法进行模拟,基于模拟数据对典型断面进行Suffer成像,进一步明确了土石比、含水率、孔隙率等不同因素对土石坝渗漏通道电场分布规律的影响,所得不同影响因素作用下的土石坝渗漏通道电场分布规律。

In order to investigate the electric field distribution laws of earth-rock dam leakage passages, the resistivity of earth-rock composite media was obtained through the series-parallel hybrid model of earth-rock structures firstly. Then the earth-rock dam leakage passages were simplified to construct analysis model, followed by the derivation of field distribution inside and outside the leakage passage. Combined with the resistivity of earth-rock composite media, the electric field distribution of constructed model for earth-rock dam leakage passage was obtained and the response laws of electric field distribution for inside and outside the leakage passage was determined. Furthermore, the finite element method was used to analyze the electric field distribution laws of different earth to rock ratios composite media under different rates of water content and porosity subjected to point-source electric field. Finally, Suffer imaging of typical sections was constructed based on the simulation data and the effects of earth-rock ratio, water content and porosity on the electric field distribution laws of earth-rock dam leakage were further determined.