摘要
盐渍土对铁路的危害主要是盐胀。本文根据调研观察提出了盐胀与冻胀的区别,并从室内试验中探索了影响盐胀的因素,从硫酸钠的溶解度变化分析了盐胀的机理。
This article generally recounts that harmful length of salinized soil along Lan - Xin railroad is roughly 1.1%, and up to 2. 2% near -by Hami area. Its harmfulness to railroad is principally salinized soil expansion. The controlling methods have been used in our bureau are to add. or neg. the rail plates; to exchange the soil and to use the chemical methods etc.This article in the discussion of harmfulness of salinized soil is at first to compare it with the frozen injury, and to point out that the differences of harmfulness of salinized soil are not by freezing; the content of easy dissolving sulphate is more; the water in the soil is not moved and the expansion begins above 0℃ etc. Moreover to expound the relations between the salinized soil expansion and content of easy dissolving sulphate; content of chloride; the content of water in soil and the variations of temperature etc. Finally analyses the theorem of salinized soil expansion attributing to dissolving variations of sodium sul phate.This artical points out that in controlling harmfulness of roadbed salinized soil first the limited quantity of sodium sulphate in salinized soil to avoid its expansion is 1.85% (or SO24- 1.25%) . Next to give an example determining the maximum controlled depth of roadbed in Hami according to its ground temperature of certain two near years is 2. 20m. And from theory to practice, puts forward the chemical method for controlling harmful-nes. Finally on the basis of compareing the various methods considers that when having condition to use the chemical method, the manual grouting of calcium chloride is economic and effective , its expense is only 27% of exchanging soil.
出处
《中国地质灾害与防治学报》
CSCD
1992年第1期83-90,共8页
The Chinese Journal of Geological Hazard and Control
关键词
盐胀
增减垫板
易溶硫酸盐
溶解度变化
限值
治理深度
人工灌注氯化钙
界限地温
salinized soil expansion, to add. or neg. the rail plates, easy dissolving sulphate, dissolving variation, limited quantity, controlled depth, manual grouting of calcium chloride, limit ground temperature
