论文部分内容阅读
随着西北大开发战略的实施,工程中涉及的Q2黄土及其重塑土日益增多。为了研究非饱和重塑Q2黄土的渗透特性及其和Q3黄土渗透特性的差异,对重塑Q2和Q3黄土分别做了4个干密度的水平土柱入渗试验;采用MP-406水分计及数据采集系统量测不同断面处体积含水率随时间的变化情况。实验研究结果表明:相同干密度的重塑Q2和Q3黄土渗水特性存在较大差异。在相同饱和度情况下,重塑Q3黄土扩散率大于重塑Q2黄土,并且随着饱和度的增大这种差异逐渐减小。不管是重塑Q2黄土还是Q3黄土,饱和度达到0.6左右时,扩散率近似由两条直线段组成;对于重塑Q3黄土,当饱和度低于0.6时,干密度的不同对扩散率影响不大;当饱和度高于0.6时,扩散率存在较大差异;但对于重塑Q2黄土,此规律不明显。
With the implementation of the Northwest Development Strategy, the loess and its remolded Q2 lands involved in the project are increasing. In order to study the infiltration characteristics of unsaturated loess remodeling Q2 loess and its difference in infiltration characteristics between Q3 and loess, four dry soil infiltration tests were conducted on the remolded Q2 and Q3 loess. Using MP-406 moisture meter and Data acquisition system to measure the different sections of the volumetric moisture content with time changes. The experimental results show that there is a big difference in the seepage characteristics between Q2 and Q3 loess with the same dry density. Under the same saturation, the diffusivity of remolded Q3 loess is greater than that of remolded Q2 loess, and the difference decreases with the increase of saturation. Whether it is reshaping the Q2 loess or the Q3 loess, the diffusivity is approximately composed of two straight line segments when the saturation reaches about 0.6; for the remodeled Q3 loess, when the saturation is lower than 0.6, the difference in dry density does not affect the diffusivity When the saturation is higher than 0.6, the diffusivities are quite different. However, this law is not obvious for reshaping Q2 loess.