石灰粉煤灰加固低液限粉土性能研究  

Study on Performance of Low Liquid Limit Silt Stabilized by Lime and Fly-ash

作　　者：李振霞[1] 王选仓[1] 薛晖[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《公路交通科技》2008年第2期40-44,共5页Journal of Highway and Transportation Research and Development

基　　金：交通部西部交通建设科技资助项目(200531881213)

摘　　要：针对低液限粉土孔隙小、透水性弱、结构性差、含毛细水等导致稳定性差的问题,通过对低液限粉土进行物理、力学性质试验,取得基本的研究参数;通过无侧限抗压强度试验、劈裂强度试验、抗压回弹模量试验,对石灰粉煤灰加固低液限粉土的稳定性能进行了系统研究,并推荐低液限粉土的最佳稳定加固方案;从物理、化学等方面对其加固机理和影响因素进行研究。试验结果表明:随着石灰粉煤灰掺量的增加,试件各个龄期的无侧限抗压强度不断增加;影响低液限粉土最佳加固方案的因素有粒组含量、土粒级配、塑性指数等;粘粒含量和塑性指数对石灰粉煤灰稳定低液限粉土的稳定效果有显著影响,石灰粉煤灰对粘粒含量高、塑性指数小的低液限粉土的稳定效果相对较好。Aiming to the poor stability of low liquid limit silt caused by small pore, poor permeability, adverse structure, tests were carried out in laboratory to get the basic physical and technical parameters of low liquid limit silt. The stability of low liquid limit silt were studied by indoors tests, such as unconfined compression strength test, splitting strength test, compression rebound modulus test, etc. to get best stability and consolidated scheme of low liquid limit silt. The consolidated principles and influencing factors on the stability were analyzed from the view of physical and chemical. The test results indicate that unconfined compression strength of samples increase with the increase of lime and fly-ash. The stability and best consolidated scheme are influenced by fraction content, soil particle grading, plasticity index and so on. The stabilization of low liquid limit silt consolidated by lime and fly-ash are affected obviously by clay content and plasticity index. The stabilization effect is better for low liquid limit silt with big clay content and small plasticity index.

关 键 词：道路工程 低液限粉土 试验 稳定性能 加固机理 石灰粉煤灰 

分 类 号：U416.212[交通运输工程—道路与铁道工程]