南宁膨胀土工程特性及化学加固试验研究  

Experimental Study on Engineering Characteristics and Chemical Consolidation of Nanning Expansive Soil

作　　者：刘小兰[1] 汪益敏[1] 

机构地区：[1]华南理工大学土木与交通学院,广州510640

出　　处：《路基工程》2010年第3期26-28,共3页Subgrade Engineering

基　　金：国家自然科学基金项目(40672178);广东省科技计划项目(2006B36302007)

摘　　要：南宁膨胀土具有胀缩总率大、膨胀性强、水稳定性差的特点,不能直接用于公路路基填筑。文中采用石灰、离子型土固化材料对其进行化学加固,通过一系列土的物理力学性质试验,对比研究改良前后土的工程特性。试验结果表明:南宁膨胀土通过石灰、复合型土固化材料加固后,土的膨胀性减弱,无侧限抗压强度增大,水稳定性增强,土的工程性质得到明显改善。Nanning expansive soil has the characteristics of large expansion factor,strong expansibility and poor water stability,unable to be directly applied in highway subgrade filling.This paper applies chemical consolidation on expansive soil with lime and ion soil solidified material,and carries out comparative study on soil engineering characteristics before and after improvement through a series of tests on its physical mechanical property.The result shows that after Nanning expansive soil improved with lime and composite soil solidified material,soil expansibility is reduced,unconfined compressive strength is increased and water stability is strengthened,and thus soil engineering characteristics are improved vastly.

关 键 词：道路工程 膨胀土 化学加固 试验研究 

分 类 号：U416.167[交通运输工程—道路与铁道工程]