含水量对路堤细粒填土的影响及对策  

The influence of water content on padding roadbed with fine soil and related countermeasures

作　　者：王甦达[1] 张林洪[1] 唐正光[1] 吴华金 段翔 彭绍勇 

机构地区：[1]昆明理工大学建筑工程学院,昆明650224 [2]云南省公路咨询公司,昆明650093

出　　处：《成都理工大学学报（自然科学版）》2008年第2期205-209,共5页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：云南省交通厅重点科技项目(TST(2005)52b104c)

摘　　要：通过对粉质重亚粘土、粉土、风化残积重亚粘土的击实试验及强度测试数据进行分析,表明高含水量填料密实度与强度之间关系有其特殊性,并非密实度越高越好,超过临界密实度后强度反而下降,且击实后的土样如果受水分侵入强度也会降低,因此采用过湿填料填筑路基时适当降低压实标准或压实功是合理的。作者探讨了多雨潮湿地区、平原低洼地区直接采用过湿填料填筑路堤时不应以最佳含水量对应的干密度为施工标准,而应以填料压实时实际含水量条件下所能达到的最大强度控制施工干密度,据此提出了相应对策以及路基保湿的概念、措施。According to the compaction test of silty heavy loam, silty soil and residual weathered heavy loam and the analysis of strength test data, the paper indicates that there is something particular in the relation between compactness and strength about the high moisture backfills. It is not that compactness is the higher, the better, but that the strength will drop after exceeding critical compactness, and the strength of compacted soil sample can be reduced by intrushing moisture, too. Therefore, it is reasonable to decrease compacted standard or compacted energy properly in adopting excessive humid backfills to till roadbeds. While adopting excessive humid backfills to fill roadbeds directly in the raininess humidification area and lowland plain area, one not regard the dry density corresponding to optimum moisture content should as the construction standard. The dry density of construction, however, should be controlled by the achievable maximum strength under the terms with actual moisture at the time of compacting backfills. This article puts forward corresponding countermeasures and the concept, measurements of roadbed moisturize in view of the above.

关 键 词：路堤 高含水量填土 防水 保湿 压实 

分 类 号：TU475[建筑科学—结构工程]