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盐渍土经砂砾改良后的路用性能实验分析

2021-09-22张磊

粘接 2021年9期

张磊

摘 要:盐渍土不同于普通土,对于环境较为敏感,工程性质容易受到外界环境因素的影响。其粘性较小、对水较为敏感、级配不良。受降雨或者温度变化的影响,盐渍土会发生脱盐现象或者发生盐胀性破坏,而导致其强度较低,难以承受较大压力,因此,在公路工程中常在盐渍土中掺入砂砾、石灰等物质对其进行改善。本文中采用掺入砂砾的方法对盐渍土进行改良,并通过实验分析了改良后盐渍土的路用性能,对于提高路基稳定性以及盐渍土较多的西北地区的公路发展具有重要意义。

关键词:盐渍土;砂砾;改良;路用性能

中图分类号:U416.1;U414        文献标识码:A 文章编号:1001-5922(2021)09-0174-03

Experimental Analysis on Road Performance of Saline Soil Improved by Gravel

Zhang Lei

(Shaanxi College of Communication Technology, Xi an 710018, China)

Abstract:Saline soil is different from ordinary soil, it is more sensitive to the environment, and its engineering properties are easily affected by external environmental factors. It is less viscous, more sensitive to water, and has poor gradation. Affected by rainfall or temperature changes, saline soil will undergo desalination or salt expansive damage, which leads to its low strength and difficult to bear greater pressure. Therefore, in highway engineering, gravel, lime and other substances are often mixed into saline soil. In the paper, the method of mixing gravel is used to improve the saline soil, and the road performance of the improved saline soil is analyzed through experiments, which is of great significance to improve the stability of subgrade and the development of highway in Northwest China where there are more saline soil.

Key words:saline soil;gravel; improvement;road performance

0 引言

鹽渍土是指在1m范围内的地表土层中,易溶盐含量在0.3%以上时,则称该土质为盐渍土。我国西北地区地质条件较为特殊,尤其是盐渍土的占地面积较广,其分布面积占我国盐渍土总面积的一半以上。近几年来,我国经济的飞速发展带动了西北地区基础设施的建设发展,尤其是在新疆地区,公路工程大力修建,但是由于西北地区的盐渍土较多,因此对于公路的修建影响较大。目前在盐渍土路基的改善修建过程中,主要采用的方法是对其进行去盐、隔水以及结构加固,例如提高路基工程、进行隔断设计、换填等等方法。导致土壤盐渍化的原因很多,温度、降雨量、含盐量、水分、土质等都会对土壤产生较大的影响。其中环境因素不可控,因此在对盐渍土进行改良处理时一般从含盐量、水分等方面着手。……

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