浅谈水泥改良湿陷性黄土干密度的时效性

研究目的:郑西客运专线铁路路基采用了水泥和石灰改良湿陷性黄土填筑,在填筑工艺性试验中出现了部分水泥改良土压实度难以满足设计要求,但是其力学指标均满足设计要求的现象。本文特针对此现象找出问题所在。研究结果:造成压实度不合格的主要原因是改良土压实度最大击实干密度的选择存在问题,作者通过室内击实试验分析,水泥改良黄土最大击实干密度存在时效性,随着水泥掺人的时间间隔不同,最大干密度呈现下降的趋势,认为选择4 h的最大击实干密度符合施工实际情况,检测的压实度均满足设计要求。

Preliminarily Discussion on the Time Effect of Dry Density of Cement-Soil

Research purposes:Cement and lime-improved loess are used as the backfill of the subgrade in Zheng-Xi passenger dedicated railway line,the partial compactions of cement-soil are very difficulty satisfy the design request,but its mechanics satisfied the design request all. Research results:Creating the compactness unqualified primary cause is the unreasonable choice of maximum compaction dry density of cement-soil.The effectiveness maximum compaction dry density of cement-soil is existence through the compaction test analysis,its maximum compaction dry density presents the drop tendency along with the different time-gap of Cement mixing.It conforms to the construction actual situation which chooses 4 hours maximum compaction dry density,the examination of compactness satisfies the design requisition all.