降雨條件下一維土柱垂直入滲模型試驗(yàn)研究及其滲透系數(shù)求解
[Abstract]:In order to study the infiltration law of one-dimensional soil column under rainfall and to solve the permeability coefficient of unsaturated soil, a set of model test equipment for vertical infiltration of one-dimensional soil column under simulated rainfall condition was developed. Four groups of one-dimensional vertical infiltration tests were carried out on unsaturated remolded loess soil columns under different rainfall intensity. The time-history curve of infiltration rate, the time-history curve of depth of infiltration peak and the variation rule of volume moisture content of monitoring point were obtained. A new method for calculating the permeability coefficient of unsaturated soil is put forward, and the relation curve between unsaturated permeability coefficient and matrix suction is obtained by combining the experimental results. The results show that: (1) the rainfall intensity has a great influence on the infiltration of vertical soil column, when the rainfall intensity is less than the minimum infiltration capacity of the soil column, the infiltration rate is equal to the rainfall intensity; When the rainfall intensity is greater than the minimum infiltration capacity of soil column, the time history curve of infiltration rate shows no pressure infiltration, and there are three stages of variation of pressure infiltration and saturation infiltration. (2) under different rainfall intensity, the duration of accumulation point and saturation point of soil column is different. The larger the rainfall intensity, the shorter the time of accumulation point and saturation point, and the longer the pressure infiltration stage is. (3) under the same rainfall intensity, the farther the monitoring point is from the upper surface of the soil column, the more dense the time history curve of volume moisture content is. (4) the permeability coefficient of unsaturated remolded loess decreases with the increase of matrix suction, and the logarithm of permeability coefficient changes linearly with the increase of matrix suction, while the larger the rainfall intensity is, the more sparse the time-history curve of volume moisture content is. (4) the permeability coefficient of unsaturated remolded loess decreases with the increase of matrix suction.
【作者單位】: 后勤工程學(xué)院軍事土木工程系;后勤工程學(xué)院巖土力學(xué)與地質(zhì)環(huán)境保護(hù)重慶市重點(diǎn)實(shí)驗(yàn)室;重慶市地質(zhì)礦產(chǎn)勘查開發(fā)局;
【基金】:國家自然科學(xué)基金資助項(xiàng)目(51479208,51408603) 重慶市基礎(chǔ)與前沿研究一般項(xiàng)目(cstc2013jcyj A00010)~~
【分類號】:TU43
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