兰州Ⅲ级阶地黄土湿陷性初步试验研究

对兰州的深厚层黄土湿陷性进行了初步研究 .采用PHI 570 2X射线光电子能谱仪测定了兰州黄土的易溶盐含量 ,结果发现其中对湿陷性影响最强烈的Na2 CO3含量比全国 (已测到 )的最高值高 4 .3倍 ,比平均值高 2 3.6倍 .通过室内试验得出该地区黄土湿陷的一些基本指标及湿陷量的范围 ,还对湿陷过程的各个阶段进行了划分和比较 ,并给出湿陷量随深度变化的规律

Preliminary experimental investigation of wet-collapsibility of third grade tableland loess in Lanzhou

A preliminary investigation of wet collapsibility of deep and thick loess stratum in Lanzhou is conducted. The resoluble salt content of Lanzhou loess is determined by using X Ray photo electronic energy spectroscope PH1 5702X. The result indicates that the content of Na 2CO 3, which is the marked influence factor on the loess collapsibility, is 4.3 times higher than that of the maximum value measured in this country, and 23.6 times higher than the average value. Some basic indexes about collapse of loess and scope of collapse quantity in this area are derived through laboratory test. Moreover, the stages in the course of collapse are divided and compared and the pattern of collapse at different depth is given, also.