草木灰改良膨胀土力学性能研究  

Study on Performance of Expanded Soil Improved by Grass Wood Ash

作　　者：史仍超 SHI Reng-chao(Shandong Provincial Communications Planning and Design Institute Group Co,Ltd,Ji′nan 250014,China)

机构地区：[1]山东省交通规划设计院集团有限公司,济南250014

出　　处：《建材世界》2025年第1期15-17,51,共4页The World of Building Materials

摘　　要：采用一维膨胀变形试验及无侧限抗压试验研究草木灰掺量及干密度对膨胀土变形及强度特性的影响。结果表明:随着草木灰掺量的增加,膨胀土的膨胀变形越小且越快趋于稳定;随着干密度的降低,改良膨胀土的湿陷性和变形增大,主膨胀阶段的持续时间缩短,次膨胀阶段的变形量和持续时间也相应减少;随着干密度的增加,改良膨胀土的峰值无侧限抗压强度和膨胀率均增大,而随着干密度减小,试样的抗变形能力和弹性模量显著减弱。One-dimensional swelling deformation tests and unconfined compressive strength tests were conducted to clarify the effects of wood ash content and dry density on the deformation and strength characteristics of improved expansive soils.The following conclusions were obtained:as the wood ash content increases,the swelling deformation of the expansive soil decreases and stabilizes more quickly.As the dry density decreases,the wetting collapse and deformation of the improved expansive soil increase,the duration of the primary swelling stage shortens,and the deformation amount and duration of the secondary swelling stage also decrease.With the increase in dry density,both the peak unconfined compressive strength and swelling rate of the improved expansive soil increase,while a decrease in dry density significantly weakens the sample’s deformation resistance and elastic modulus.

关 键 词：膨胀土 草木灰 膨胀变形 无侧限抗压强度 

分 类 号：TU4[建筑科学—土工工程]