论文部分内容阅读
为探明察尔汗盐湖区盐渍土的微观结构特征及其力学特性,对原状氯盐渍土进行电镜扫描、力学强度试验,从微观结构上分析了盐渍土的力学特性,提出了察尔汗盐湖区盐渍土微结构的连结形式,并将研究结果与新疆板块状盐渍土相关研究成果进行了对比。结果表明:(1)盐渍土微结构连结有三种形式:1点接触,2堆叠接触,3晶体胶结;(2)不同含盐量的盐渍土微观结构形式不同。盐晶体的胶结作用是影响其力学特性的显著因素;(3)无侧限抗压强度显著变化的含盐量拐点为45.74%;(4)青海察尔汗盐湖盐渍土属细粒土,其颗粒胶结作用随含盐量的增加而增强,其力学特性也在不断提高。而新疆板块状盐渍土属粗粒土,土颗粒胶结作用和力学强度随着含盐量的增加先增加后减小,存在一个最佳含盐量峰值,这是两地区盐渍土微结构和强度变化特性最显著的区别。
In order to explore the microstructure and mechanical properties of saline soil in Chaer Khan Salt Lake region, scanning electron microscopy and mechanical strength tests of the original saline soil were carried out. The mechanical properties of saline soil were analyzed from the microstructure. The connection between the microstructure of saline soil in the Khan Salt Lake region and the related research results of the plate-like saline soil in Xinjiang was contrasted. The results show that: (1) There are three types of microstructures in the saline soil: 1-point contact, 2-stack contact and 3-crystal cementing; (2) The microstructures of salty soil with different salt content are different. (3) The inflexion point of salt content with unconfined compressive strength changed significantly was 45.74%; (4) The saline soil in Qinghai Chaerhan Salt Lake belonged to fine-grained soil, The cementation of particles increases with the increase of salt content, and its mechanical properties are also increasing. The plate-like saline soil in Xinjiang belongs to the coarse-grained soil. The cementation and mechanical strength of the soil particles increase firstly and then decrease with the increase of salt content, and there is an optimum salt content peak, which is the microstructure of the saline soil in the two areas And the strength of the most significant difference between the characteristics of change.