石灰稳定膨胀土工程特性及施工含水率优选研究  

Study on Engineering Characteristics of Lime Stabilized Expansive Soil and Optimization Method of Construction Moisture Content

作　　者：王勇 WANG Yong(Henan Yongming Municipal Garden Construction Co.,Ltd. ,Xinxiang 453099,China)

机构地区：[1]河南永明市政园林建设有限公司,新乡453099

出　　处：《粉煤灰综合利用》2019年第4期51-55,共5页Fly Ash Comprehensive Utilization

摘　　要：为指导石灰稳定膨胀土路基设计与施工,通过室内与现场试验研究石灰剂量对石灰稳定膨胀土路基填料工程特性影响,并确定其最佳石灰剂量与施工含水率。试验结果表明:石灰剂量6%时,对膨胀土路基填料工程特性改善效果显著,液限降低38%,自由膨胀率、无荷膨胀率及有荷膨胀率分别降低了76%、80%和21%,黏聚力和内摩擦角分别提高了48%和42%,且现场路基最大可压实水平达到96%,CBR与胀缩总率满足路基设计要求;施工含水率19%时,试样无侧限抗压强度最高,且现场路基压实效果最优。因此,结合经济、生态效益及路基施工工艺,建议膨胀土路基填料最佳石灰剂量为6%,施工含水率为(19±1)%。In order to guide the design and construction of lime stabilized expansive soil subgrade, the influence of lime dosage on the engineering characteristics of lime stabilized expansive soil subgrade filler was studied through indoor and on-site experiments, and the optimum lime dosage and construction moisture content were determined. The test results show that when the lime dosage is 6%, the engineering properties of the expansive soil roadbed filler are improved, the liquid limit is reduced by 38%, and the free expansion ratio, the no-load expansion ratio and the charge expansion ratio are reduced by 76%, 80% and 21% respectively. cohesion and internal friction angle increased by 48% and 42%, respectively, and the maximum compactable level of the roadbed reached 96%. The CBR and expansion and shrinkage ratio met the subgrade design requirements;when the construction moisture content was 19%, The unconfined compressive strength of the sample is the highest, and the on-site subgrade compaction effect is optimal. Therefore, combined with economic, ecological benefits and roadbed construction techniques, it is recommended that the optimum lime dosage and construction moisture content of the expansive soil roadbed filler are 6% and 19±1%, respectively.

关 键 词：石灰稳定膨胀土 路基填料 工程特性 石灰剂量 施工含水率 

分 类 号：U416[交通运输工程—道路与铁道工程]