砾石含量及粒径对崩岗崩积体渗透特性的影响

Effects of Content and Size of Gravel on Soil Permeability of the Colluvial Deposit in Benggang

为探讨砾石对崩积体渗透性的影响,采用环刀法对不同砾石含量及粒径条件下崩积体入渗特性的变化进行研究。结果表明:(1)0%,10%,20%,30%砾石含量崩积体进入稳渗时间在9~10min之间,40%,50%砾石含量崩积体进入稳定时间在19~20min之间。(2)相同粒径砾石条件下,崩积体的初渗率、稳渗率、平均入渗率及入渗量随砾石含量的增加而增大;含2~3,3~5,5~10mm砾石崩积体的入渗参数在10%,20%,30%砾石含量时变化不大;当砾石含量为40%时,入渗参数随着砾石粒径的增大而减小;当砾石含量为50%时,含3~5mm砾石的崩积体的入渗参数最小。(3)Kostiakov公式拟合更适合模拟崩积体的入渗模型。

The aim of this study was to explore the influence of gravel on infiltration characteristics of the colluvial deposit.The cutting ring method was used to study the changes of infiltration characteristics of the colluvial deposit that mixed with different content and size of gravel.The results were as follows：（1）The steady infiltration time of the colluvial deposit was between 9min and 10 min when the content of gravel was0%,10%,20%,and 30%,but it was between 19 and 20 min when the content of gravel was 40% and50%.（2）The initial infiltration rate,steady infiltration rate,average infiltration rate,and accumulative infiltration volume of the colluvial deposit were enhanced with the increasing gravel content.The infiltration parameters changed little at 10%,20%,and 30% gravel content when the colluvial deposit was mixed with gravels of 2-3mm,3-5 mm,and 5-10 mm size.The values of infiltration parameters decreased with increasing size of gravels when the gravel content was 40%;when the gravel content was 50%,the values of infiltration parameters of the colluvial deposit mixed with 2-3mm gravel were the least.（3）A further comparison showed that the Kostiakov model was more suitable for simulating the infiltration process of the colluvial deposit.