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Position: Home > Articles > Development and Application of Absorption Permeameter for Unsaturated Soil Soil and Water Conservation in China 2014 (8) 50-52+69

非饱和土调压吸水实验仪的研制与应用

作  者：
王念秦;王庆涛;薛茜
单  位：
西安科技大学地质与环境学院;西安邮电大学通信与信息工程学院
关键词：
非饱和土;调压吸水实验仪;研制;应用
摘  要：
黄土斜坡稳定性与地下水位变化密切相关,而对地下水位变化的定量描述比较困难,为此对达西实验装置进行改进,探索研制非饱和土调压吸水(向上渗流)实验仪。实验仪主要由补水装置和渗流(取样)装置两部分组成。基于此实验仪,取某地马兰黄土试样进行试验研究,试验现象是:无水头或定水头压力条件下,向上渗流锋面全渗程均呈上凸形态,但渗流锋面曲率由下至上呈递增趋势;不同水压力条件下,渗流过程均存在快速渗流和趋稳渗流两个阶段,只是出现拐点的时间、渗流高度稍有不同;水头压力对快速渗流阶段影响明显,水头压力越大向上渗流速率越快、渗流高度越大。试验结果表明:实验仪能够较好地模拟带压地下水向上渗流的水—土作用过程,获取所需要的渗流路径、渗流锋面移动速度等参数,具有一定的应用价值和前景。
译  名：
Development and Application of Absorption Permeameter for Unsaturated Soil
作  者：
WANG Nian-qin;WANG Qing-tao;XUE Qian;College of Geology and Environment,Xi’an University of Science and Technology;School of Telecommunication and Information Engineering,Xi’an University of Posts & Telecommunications;
关键词：
unsaturated soil;;absorption permeameter;;development;;application
摘  要：
The stability of loess slope is closely related to the changes of underground water level and it is difficult to make quantitative description of the variations of groundwater level. Thus,it improved Darcy experimental devices and explored pressure regulator(upward flow) experimental instrument of unsaturated soil. The instrument constituted two parts of water replenishing device and seepage( sampling) device.Based on the experimental apparatus,it studied some samples of Malan loess and got the following phenomena: a) the infiltration process of seepage fronts showed convex shape,but the curvature showed increasing trend from bottom to top under the conditions of no water head or fixed head pressure; b) the seepage process had two phases of rapid seepage and stabilized seepage flow,with slightly different on the turning point of time and seepage height under the different conditions of hydrostatic pressure and; c) the rapid seepage stage was obviously affected by hydrostatic pressure,the greater the hydraulic pressure the faster the velocity of upward seepage and the higher the seepage. The outcomes show that the instrument can nicely simulate the water-soil interaction process of seepage flow of pressurized groundwater,obtain the required parameters of seepage flow paths and the velocity of seepage flow fronts and have a certain application value and prospects.

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