泾阳县南塬黄土边坡渗透系数变异性分析

发布时间：2018-05-11 11:33

本文选题：黄土 + 渗透系数　；参考：《长安大学》2015年硕士论文

【摘要】：黄土的渗透性是黄土性质的重要组成部分。研究黄土不同方向的渗透性对由于水的渗透引起的黄土滑坡具有很重要的理论意义。本文以泾阳县为研究区域,选择寨头村和蒋刘村黄土为研究对象。在寨头村黄土边坡探槽布设一条竖直方向的取样线,共布设22个取样点;在蒋刘村黄土的平硐内布设一条水平方向取样线,共布设12个取样点。通过室内的变水头渗透试验测得黄土饱和垂向渗透系数与水平渗透系数,并进行正态分布检验,然后采用传统统计学方法和地统计学方法分析其空间变异特性。通过测定土-水特征曲线的间接方法计算出黄土非饱和渗透系数,并分析其与含水率的关系。结果得出:(1)室内变水头试验测得探槽Kv平均值为3.23×10-4cm/s,Kh平均值为1.70×10-4cm/s;平硐处Kv平均值为3.23×10-4cm/s,Kh平均值为1.29×10-4cm/s,Kh与Kv差异较大。(2)探槽处黄土饱和渗透系数Kh、Kv整体上均服从对数正态分布;探槽处马兰黄土层及离石黄土层饱和渗透系数Kh、Kv也均服从对数正态分布;平硐内黄土饱和渗透系数Kh、Kv均服从对数正态分布。(3)基于传统的统计学方法,得出探槽处Kh、Kv,平硐处Kh、Kv都属于中等变异性。基于地统计学,探槽及平硐处的饱和渗透系数Kh、Kv的空间变异性主要由黄土自身的结构性引起的,随机性引起的空间变异性很小,作用很小。探槽和平硐处Kv的变程值大于Kh的变程值,竖直方向的相关性要比水平方向大。(4)黄土饱和渗透系数有随着埋深增加而减小的趋势,但在每个地层内渗透系数的分布有很强变异性。
[Abstract]:The permeability of loess is an important part of the nature of the loess. It is of great theoretical significance to study the permeability of different directions of the loess to the loess landslide caused by water infiltration. This paper chooses Jingyang County as the research area and chooses the Loess in Zhai tou village and Jiang Liu village as the research object. A vertical square is laid on the Loess Slope in Zhai tou village. 22 sampling points were set up in the sampling line, and a horizontal sampling line was set up in the adit of the Loess Plateau of Jiang Liu village. A total of 12 sampling points were set up. The saturated vertical permeability coefficient and the horizontal permeability coefficient of the loess were measured by the water head permeability test in the room, and the normal distribution was tested. Then the traditional statistical method and geostatistics were used. Method analysis its spatial variation characteristics. Through the indirect method of measuring soil water characteristic curve, the unsaturated permeability coefficient of loess is calculated and its relationship with water content is analyzed. The results are as follows: (1) the average value of Kv is 3.23 x 10-4cm/s and Kh average value is 1.70 x 10-4cm/s; the mean value of Kv at the adit is 3.23 x 10-4cm/s, Kh The average value is 1.29 x 10-4cm/s, and the difference between Kh and Kv is great. (2) the saturated permeability coefficient of the Loess at the trough is Kh, Kv is all subordinate to the logarithmic normal distribution, the saturated permeability coefficient of the Ma Lan loess layer and the gravel loess layer is Kh, and Kv also obeys the logarithmic normal distribution, and Kv all obeys the logarithmic normal distribution in the adit of the Loess and the permeability coefficient Kh, and (3) based on the transmission. According to the statistical method, the Kh, Kv, Kh and Kv in the cavern are of medium variability. Based on geostatistics, the saturation permeability coefficient of the slots and adit is Kh, and the spatial variability of Kv is mainly caused by the structure of the Loess itself. The spatial variability caused by the randomness is very small and the function is very small. The variation range of the Kv in the slots peace chamber is greater than Kh. The correlation of vertical direction is larger than that in horizontal direction. (4) the saturated permeability coefficient of loess decreases with the increase of buried depth, but the distribution of permeability coefficient in each stratum has a strong variability.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22

【相似文献】