冻融循环对改良红粘土力学特性的影响研究  

Research on Impact of Freeze-Thaw Cycle on Mechanical Properties Improvement of Red Clay

作　　者：李建红[1] 

机构地区：[1]山西交通职业技术学院公路工程系,山西太原030006

出　　处：《筑路机械与施工机械化》2016年第2期57-60,共4页Road Machinery & Construction Mechanization

摘　　要：通过对不同冻融循环次数和不同水泥掺量条件下的红粘土开展无侧限抗压强度和直剪强度试验,分析了冻融循环作用对改良红粘土的无侧限抗压强度、应力-应变关系、粘聚力的影响。研究结果表明:红粘土的无侧限抗压强度和粘聚力随冻融循环次数增加呈线性衰减;水泥红粘土的无侧限抗压强度随着水泥掺量的增加呈线性增长,水泥最佳掺量为20%左右;随着试验剪应力的增加,应力-应变的关系曲线存在峰值,未冻融试件的应力峰值大小约为残余应力峰值的3倍。Tests on unconfined compressive strength and direct shear strength of red clay were conducted with different freeze-thaw cycles and cement content. The impacts of freeze-thaw cycle on unconfined compressive strength, stress-strain relationship and the cohesion of red clay were studied. The results show that both unconfined compressive strength and the cohesion attenuate linearly; unconfined compressive strength becomes stronger following the increase of cement content, of which the optimal value is 20 % ; there will he a peak on the stress-strain curve when the shear stress increases, and the peak value for specimens without freeze-thaw cycles is three times the value of residual stress.

关 键 词：改良红粘土 冻融循环 无侧限抗压强度 抗剪强度 

分 类 号：U416.1[交通运输工程—道路与铁道工程]