甘肃黑方台黄土固结-渗透特性试验研究  

Permeability characteristics of loess under different consolidation pressures in the Heifangtai platform

作　　者：蔺晓燕[1] 李同录[2] 赵纪飞[3] 王红[2] 李萍[2] 

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]长安大学地质工程与测绘学院,陕西西安710054 [3]中国水电顾问集团西北勘测设计研究院,陕西西安710065

出　　处：《水文地质工程地质》2014年第1期41-47,共7页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目(40972182;40772181)

摘　　要：室内渗透试验过程中由于土样经过了卸荷回弹,所测得的渗透系数并不是土体真实应力状态下的渗透系数,为此对传统渗透仪进行改装,并以黑方台黄土为研究对象,对不同深度的黄土试样进行不同压力下土的固结-渗透试验,对比分析了土的变形及渗透特征.结果表明,室内常规变水头渗透试验所得黄土渗透系数较固结-渗透试验所测得数据大25～40倍.将常规渗透试验和固结-渗透试验测得的渗透系数应用于SEEP/W软件进行灌溉入渗模拟,将两种模拟结果与实际调查情况进行对比,得到后者与实际情况较一致,可见进行固结-渗透试验得到的试验数据更具有实际应用价值.The sample used in permeability test is usually unloaded and is not in the real stress environment. The permeability coefficient obtained is not what we want. In order to restore the real stress environment of the sample, the instruments are improved. The loess from different depths in the Heifangtai platform is chosen as the object of this study, and the consolidation-permeability test under different stress environments are carried out. The comparative analysis is made on the deformation and permeability of the loess under the effect of different loads. The results show that the permeability coefficient obtained from the penetration test under consolidation is 25 to 40 times as high as that obtained from the conventional penetration test. The irrigation- permeability modeling has been finished with the SEEP/W importing the results from two different tests. Comparison of the two seepage modeling results indicate that the permeability coefficient from the permeability test under consolidation pressure are more likely to reflect the practical phenomena, thus has more practical application. The research results are of great significance in the stability study of landslide.

关 键 词：黑方台 黄土 固结压力 渗透系数 

分 类 号：TU411[建筑科学—岩土工程]