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不同地区的盐渍土,其工程特性存在着较大差异,为揭示罗布泊干盐湖区盐渍土的力学性能和对路基的病害机理。该文采用扫描电子显微镜及X射线能谱(EDX)分析研究该地区盐渍土的矿物成分和微结构与溶陷性、无侧限抗压强度特性的相互关系。结果表明:盐渍土氯盐和硫酸盐含量大于50%,有的甚至超过了60%,主要以氯盐为主;矿物成分主要含石英、石膏、钾长石、钙长石等。由土颗粒、NaCl、Na2SO4胶结而成的盐岩、岩盖结构致密,但由于易溶盐含量和胶结情况的不同,干燥和湿润状态下微结构变化很大导致其无侧限抗压强度有很大的差异,通过试验发现:只有在含水率达到一定程度以后,该地区盐渍土才发生溶陷变形现象。
The salinized soils in different areas have great differences in their engineering properties. In order to reveal the mechanical properties of the saline soil in Lop Nur dry salt lake area and the disease mechanism of subgrade. In this paper, the relationship between the mineral composition, microstructure and trapping and unconfined compressive strength of saline soils in the area was studied by scanning electron microscopy and energy dispersive X-ray spectroscopy (EDX). The results show that the content of chloride and sulfate in saline soil is more than 50%, some of them even exceed 60%, and the main ones are chloride. The mineral components mainly contain quartz, gypsum, potassium feldspar and calcium feldspar. The salt rock formed by ceramsite, NaCl and Na 2 SO 4 cementation has compact structure. Due to the difference of soluble salt content and cementation, the microstructures change greatly under dry and wet conditions, resulting in unconfined compressive strength A great difference, through the experiment found that: only after the moisture content reached a certain level, the saline soil in the region only took place in the phenomenon of deformation.