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含水量是影响黄土震陷性非常重要的参数。本文以洮河三级阶地上典型的Q3黄土为研究对象,对其震陷性特征进行了全面、系统的研究。通过在20 m深探井中依次取得4 m、8 m、12 m、16 m、20 m处黄土原状试样进行室内试验,得到以下结果:(1)天然黄土存在震陷性随深度增加而逐渐减弱的规律;(2)通过增湿、减湿获得5%,10%,15%和20%四种不同含水量黄土试样,同一深度黄土随着含水量增加其震陷性增长的规律明显;(3)通过实验数据分析得到了含水量对黄土震陷性定量影响规律,并根据其规律给出了不同动应力作用下的黄土震陷临界含水量。
Water content is a very important parameter that affects loess collapsibility. In this paper, the typical Q3 loess on the third terrace of the Taohe River was studied, and the characteristics of its collapses were comprehensively and systematically studied. Through in-situ tests of original loess samples of 4 m, 8 m, 12 m, 16 m and 20 m in succession in a depth of 20 m, the following results were obtained: (1) Seismicity of natural loess gradually decreases with depth (2) Four kinds of loess samples with different water contents of 5%, 10%, 15% and 20% were obtained by humidification and dehumidification. The same depth of loess with obvious increase of water content was obviously ; (3) Based on the experimental data, quantitative laws of water content affecting the loess collapsibility were obtained. According to the law, the critical water content of loess subsidence under different dynamic stresses was given.