陕西关中地区离石黄土崩解速率实验研究

EXPERIMENTAL STUDY ON DISINTEGRATION RATE OF LISHI LOESS IN GUANZHONG REGION OF SHAANXI PROVINCE

本文以陕西关中地区离石黄土为研究对象,研制土体崩解实验仪器,进行室内小尺寸浸水实验,测定土体崩解过程中的各项参数,以探索该区域的离石黄土的崩解速率特性,为区域内离石黄土边坡失稳的时间预测研究提供参考.实验结果揭示了崩解过程中的一些现象和规律（1）离石黄土在不同浸水条件下,整个崩解过程可分为从浸水开始-拟定浸水深度时的快速崩解阶段与浸水水位稳定后的趋稳崩解阶段.（2）黄土体崩解速率的大小与浸水深度、接触面关系密切,崩解速率与时间呈折线关系,从浸水开始拟定浸水深度,崩解速率出现峰值之后快速降低到0.21～0.25kg·min^-1,直至浸水水位稳定后崩解速率稳定在0.08～0.14kg·min^-1.（3）黄土试样浸水范围固定时,随着浸水深度的增加,土样的趋稳崩解速率线性增加,并呈现一定的线性相关性.

This paper examines the Lishi loess of Guanzhong region. It develops a soil disintegration test instrument for doing the flooding experiment of indoor small size. It measures soil disintegration process parameters to explore Lishi loess rate characteristics of disintegration in the region. It aims to offer a reference for time prediction of Lishi loess slope instability in the region. The results reveal some phenomena and laws of the disintegration process.Under different flooding conditions,the whole process of Lishi loess can be divided into rapid disintegration stage from the experiment beginning to formulate flooding depth and disintegration stabilization phase after flooding water.Loess body size has a certain relationship with rate of disintegration,the immersion depth and contact area. The rates of disintegration have broken line relationship with time. The disintegration rate is reduced rapidly to about0. 21 ~ 0. 25kg·min-1after a peak from the experiment beginning to formulate flooding depth. Then the disintegration rate is fixed in 0. 08 ~ 0. 14kg·min-1until after flooding water stability. When loess sampling extent of flooding is fixed,with the increase of immersion depth,the stabilization of the soil disintegration rate increases linearly,and presents a linear correlation.