含鹽量對亞硫酸鹽漬土抗剪強(qiáng)度影響的試驗
本文選題:土壤 + 鹽 ; 參考:《農(nóng)業(yè)工程學(xué)報》2016年06期
【摘要】:為探討含鹽量對鹽漬土抗剪強(qiáng)度的影響,該研究對采自于青海柴達(dá)木盆地大柴旦鹽湖地區(qū)的鹽漬土進(jìn)行了洗鹽試驗以獲得素土試樣;根據(jù)該區(qū)鹽漬土類型及鹽漬化程度,在洗鹽后土體中分別加入不等量的無水硫酸鈉(Na2SO4),以獲得不同含鹽量的人工配制硫酸鹽漬土,并對上述不同含鹽量的人工配制硫酸鹽漬土開展室內(nèi)直接剪切試驗。試驗結(jié)果表明,洗鹽試驗后土體中的易溶鹽離子含量及p H值均顯著低于洗鹽前鹽漬土;當(dāng)土體密度和含水量分別為1.41 g/cm3和25.68%時,洗鹽后土體粘聚力c值和內(nèi)摩擦角φ值分別為14.8 k Pa和26.5°,均高于洗鹽前鹽漬土的粘聚力值(6.7 k Pa)和內(nèi)摩擦角值(24.6°);不同含鹽量梯度條件下的人工配制硫酸鹽漬土的粘聚力和內(nèi)摩擦角,隨土體含鹽量增加均表現(xiàn)出先減小后增加的變化特征。當(dāng)含鹽量由0.74%增至5.17%時,人工配制硫酸鹽漬土粘聚力c值和內(nèi)摩擦角φ值均呈逐漸減小的變化規(guī)律,當(dāng)土體含鹽量由5.17%增至14.17%時,人工配制硫酸鹽漬土粘聚力c值和內(nèi)摩擦角φ值均表現(xiàn)出增加的變化規(guī)律,且當(dāng)含鹽量為5.17%時,其粘聚力c值和內(nèi)摩擦角φ值分別為8.3 k Pa和26.1°,均為最小值,即該值對應(yīng)的含鹽量值即為人工配制硫酸鹽漬土的含鹽量閾值。本項研究成果對于進(jìn)一步探討含鹽量變化對鹽漬土抗剪強(qiáng)度影響,及含鹽量變化與鹽漬土粘聚力和內(nèi)摩擦角之間的關(guān)系等方面具有理論研究價值和實(shí)際意義。
[Abstract]:In order to study the effect of salt content on the shear strength of saline soil, the salinized soil collected from the salt lake area of Qaidam Basin, Qinghai Province, was washed with salt to obtain the sample of plain soil, and according to the type of saline soil and the degree of salinization in this area, Different amounts of anhydrous sodium sulfate (Na _ 2SO _ 4) _ 4 were added to the soil body after salt washing in order to obtain artificially prepared sulphate soil with different salt content, and the laboratory direct shear test was carried out on the artificially prepared sulphate soil with different salt content. The results showed that the soluble salt ion content and pH value in soil after salt washing test were significantly lower than those in saline soil before washing salt, and when the soil density and water content were 1. 41 g/cm3 and 25. 68 g/cm3, respectively, After salt washing, the cohesive force c and internal friction angle 蠁 were 14.8 KPA and 26.5 擄, respectively, which were higher than that of saline soil before washing (6.7 KPA) and internal friction angle (24.6 擄). Cohesion and angle of internal friction, With the increase of soil salt content, the variation of soil salt content decreases first and then increases. When the salt content increases from 0.74% to 5.17%, the cohesive force c value and the internal friction angle 蠁 value of the artificial sulfate saline soil decrease gradually, and when the salt content of the soil increases from 5.17% to 14.17%, The cohesion c value and internal friction angle 蠁 value of artificial sulphate soil both show the increasing law of variation, and when the salt content is 5.17, the cohesion c value and the internal friction angle 蠁 value are 8.3 KPA and 26.1 擄, respectively, which are the minimum values, respectively, when the salt content is 5.17, the cohesion C value and the internal friction angle 蠁 value are respectively 8.3 KPA and 26.1 擄, respectively. The salt content value corresponding to this value is the threshold value of the salt content of the artificially prepared sulphuric acid saline soil. The results of this study have theoretical and practical significance for further study on the influence of salt content change on the shear strength of saline soil and the relationship between salt content change and cohesion and internal friction angle of saline soil.
【作者單位】: 中國科學(xué)院青海鹽湖研究所;中國科學(xué)院大學(xué);青海大學(xué)地質(zhì)工程系;
【基金】:國家自然科學(xué)基金資助項目(41162010;41572306) 中國科學(xué)院“百人計劃”資助項目(Y110091025);中國科學(xué)院青海鹽湖所“青年基金”項目資助(Y360441058)
【分類號】:S156.4
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