固化黄土渗透特性的试验研究

Experimental Study on Permeability of Solidified Loess

以取自于山西不同地点的两种黄土为研究对象,选用水泥、生石灰、高分子材料SH固化剂及组合进行加固处理,通过变水头渗透试验,测定了素黄土及加固黄土在设计干密度下的渗透系数,并探讨渗透试验条件下各种影响因素对其渗透特性的影响规律。结果表明:两种黄土经重塑压实后的渗透系数均较小,黄土1略大于黄土2,基本能满足渠道等工程的防渗要求;对于防渗要求比较高的黄土工程,用水泥、生石灰和SH均可进一步改善其抗渗性,固化黄土后的渗透系数减小,固化黄土的渗透系数随着固化剂掺量和养护龄期的增长而减少。生石灰与SH相比,生石灰对固化土的渗透性影响更大。

In this paper, two kinds of loess in Shanxi province are studied. Solidifying agents including cement, quicklime, SH-polymer material and their combination were used. Through variable head permeability test, the permeability coefficients of the Loess and the solidified loess in designed dry density are measured, the effects of various factors on the permeation characteristics were explored. The results show that： the permeability coefficients of two remodeled loess after compaction were small, while the permeability coefficient of serial of loess 2 was smaller than that of serial of loess 1. They basically met the requirements for engineering of canal seepage control; cement, quicklime and SH improved the impermeability of loess, the permeability coefficients of loess solidified by different solidifying agents decreased as the mixing amount of solidif ying agents and curing period increased; the effect of quicklime was greater than SH.