新疆伊犁南岸干渠黄土渠段湿陷性分析

新疆伊犁南岸干渠工程明渠段沿线风积黄土广布,黄土的湿陷性对工程具重要影响。本文依据规范并考虑工程实际,对区内黄土的湿陷性等级、起始湿陷压力、湿陷性黄土厚度进行了综合分析,分析了挖方渠道黄土的湿陷性程度;并在考虑降雨土体非饱和过程的条件下,对填方渠道土地基的湿陷变形量进行了详细深入的研究。通过分析认为,工程区黄土渠段为非自重湿陷性场地,湿陷等级为Ⅰ～Ⅱ级;压实后的黄土不具湿陷性;无论是挖方渠道还是填方渠道,经过换填处理和设置排水措施后,即可消除湿陷性,无需要再做专门处理措施。

COLLAPSIBILITY OF LOESS AT SOUTH BANK OF THE YILI TRUNK DITCH IN XINJIANG

There is a great area of loses along the Yili trunk ditch in Xinjiang province. The collapsibility of the losses with water has a great impact to construction in the region. On the basis of many tests, a detailed analysis about the grade, the initial pressure and the depth of loess collapaibilty, and the degree of loess collapaibilty along the ditch built by excavating is given in this paper. A deep analysis is also made to the collapaibilty along the ditch built by piling considering the unsaturation of loess. It reveals the grade of collapssility is Ⅰ～Ⅱ and belongs to the non-self-weight collapse loess in the field along the ditch and the loess would lose collapssility after being compacted. It is also found that the loess would lose its collapssility only by permutation and drainage. Other measures are not needed to remove the loess collapssility.