水泥改良粉细砂在干湿环境下力学性能试验研究

Experimental study on mechanical performance of cement-improved silty fine sand in wet and dry conditions

改良土是近年来在缺乏可用性的路基填料地区中广泛采用的一种填料,对于改良后路基填料的基本工程性质,反复干湿循环之后对填料强度的影响及其影响机理关注较多,而对在长期干燥或长期潮湿环境下改良土的工程性质还缺乏探讨。本文对内蒙地区(新建包神铁路)工地现场的粉细砂土样进行水泥改良,将不同龄期的试样分别放在干燥、潮湿、干—湿交替3种不同环境中一段时间后,检测试样的无侧限抗压强度、含水率和质量变化,通过分析试验数据,从而了解改良粉细砂在不同环境下的工程特性。

Recently the improved soil is a kind of widely adoptive stuffing in usable roadbed stuffing absence area.The basic engineering character of improved roadbed stuffing such as the influence of iterative wetting-drying cycle on stuffing intensity has drawn more attention,while the engineering character of improved soil under long wet or dry conditions are not been studied.Based on the improved powdered fine sand by adding cement in inner Mongolia jobsite（new-construction BaoShen railway）,this paper studied the samples of different age period in three different conditions including wet,dry,and wetting-drying cycle,tested the unconfined compressive strength,moisture content,and quality changes after a period of time.The engineering properties of improved powdered fine sand in different environment are detected through analyzing the experimental data,which can offer the corresponding data for practical engineering.